updated help.html

.gitignore

@@ -0,0 +1,6 @@
+node_modules/
+public/css/*.css
+public/js/*.js
+build/*.png
+db.sqlite
+

Dockerfile

@@ -0,0 +1,3 @@
+FROM alpine:3.11.5
+RUN apk add --no-cache nodejs npm git python3 python2 alpine-sdk && npm i -g node-gyp && git clone https://gitdab.com/Codinget/Snek /snek && cd /snek && npm i --unsafe-perm && apk del git python2 python3 alpine-sdk && printf '#!/bin/sh\ncd /snek\nnpm start\n' > start.sh && chmod +x start.sh
+CMD /snek/start.sh

Makefile

@@ -0,0 +1,96 @@
+.PHONY: all clean mrproper
+
+SIZE = 32
+TEMPSIZE = $(shell echo $(SIZE) '*4' | bc)
+
+FIRE_ANIM = $(foreach angle, $(shell seq 0 6 359), build/fire$(angle).png)
+PEACH_DECAY_ANIM = $(foreach percent, $(shell seq 99 -1 0), build/peach-decay$(percent).png)
+PEACH_RAINBOW_ANIM = $(foreach percent, $(shell seq 100 2 299), build/peach-rainbow$(percent).png)
+PORTAL_ANIM = $(foreach angle, $(shell seq 0 6 359), build/portal-a$(angle).png)
+
+IMAGES = $(foreach name, apple wall oil key door, public/assets/$(name)$(SIZE).png)
+TILESETS = $(foreach name, hole switch spikes, public/assets/$(name)-ts.png)
+ANIMATIONS = $(foreach name, fire peach-decay peach-rainbow portal-a portal-b portal-c portal-d, public/assets/$(name)-anim.png)
+JSON = $(foreach name, snake levelList config metaConfig, public/assets/$(name).json)
+ICON = public/assets/icon32.png public/assets/icon256.png public/favicon.ico
+CSS = public/css/snek.css
+JS = public/js/snek.js
+
+OUTPUT = $(IMAGES) $(TILESETS) $(ANIMATIONS) $(JSON) $(ICON) $(CSS) $(JS)
+
+all: images tilesets animations json icon css js
+
+images: $(IMAGES)
+tilesets: $(TILESETS)
+animations: $(ANIMATIONS)
+json: $(JSON)
+icon: $(ICON)
+css: $(CSS)
+js: $(JS)
+
+public/favicon.ico: assets/icon.jpg
+	convert $^ -resize 32x $@
+
+public/assets/%32.png: assets/%.png
+	convert $^ -resize 32x $@
+public/assets/%256.png: assets/%.png
+	convert $^ -resize 256x $@
+public/assets/%$(SIZE).png: assets/%.png
+	convert $^ -resize $(SIZE)x $@
+
+public/assets/%32.png: assets/%.jpg
+	convert $^ -resize 32x $@
+public/assets/%256.png: assets/%.jpg
+	convert $^ -resize 256x $@
+public/assets/%$(SIZE).png: assets/%.jpg
+	convert $^ -resize $(SIZE)x $@
+
+build/%-smol.png: assets/%.png
+	convert $^ -resize $(TEMPSIZE)x\> $@
+
+public/assets/%-ts.png: assets/%.png
+	convert $^ -scale $(SIZE)x $@
+
+public/assets/fire-anim.png: $(FIRE_ANIM)
+	convert $^ -append $@
+
+build/fire%.png: build/fire-smol.png
+	convert $^ -distort ScaleRotateTranslate $(shell echo $@ | sed 's/[^0-9]*//g') -resize $(SIZE)x $@
+
+public/assets/peach-decay-anim.png: $(PEACH_DECAY_ANIM)
+	convert $^ -append $@
+
+build/peach-decay%.png: build/peach-smol.png
+	convert $^ -modulate 100,$(shell echo $@ | sed 's/[^0-9]*//g') -resize $(SIZE)x $@
+
+public/assets/peach-rainbow-anim.png: $(PEACH_RAINBOW_ANIM)
+	convert $^ -append $@
+
+build/peach-rainbow%.png: build/peach-smol.png
+	convert $^ -modulate 100,100,$(shell echo $@ | sed 's/[^0-9]*//g') -resize $(SIZE)x $@
+
+build/portal-a%.png: build/portal-smol.png
+	convert $^ -distort ScaleRotateTranslate $(shell echo $@ | sed 's/[^0-9]*//g') -resize $(SIZE)x $@
+
+public/assets/portal-a-anim.png: $(PORTAL_ANIM)
+	convert $^ -append $@
+public/assets/portal-b-anim.png: public/assets/portal-a-anim.png
+	convert $^ -modulate 100,100,200 $@
+public/assets/portal-c-anim.png: public/assets/portal-a-anim.png
+	convert $^ -modulate 100,100,150 $@
+public/assets/portal-d-anim.png: public/assets/portal-a-anim.png
+	convert $^ -modulate 100,100,50 $@
+
+public/assets/%.json: assets/%.json
+	ln -s ../../$^ $@
+
+public/css/snek.css: src/less/snek.less $(wildcard src/less/*.less)
+	node_modules/.bin/lessc $< $@
+
+public/js/snek.js: $(wildcard src/js/*.js)
+	node mergejs.js $^ > $@
+
+clean:
+	rm -f build/*.*
+mrproper: clean
+	rm -f $(OUTPUT)

README.md

@@ -1,3 +1,54 @@
 # Snek
+![Snek icon, Miia from Mon Musu](assets/icon.jpg)
 
-A simple Snake, done as my final JS class project
+A "simple" Snake, done as my final JS class project
+
+[Original subject](https://perso.liris.cnrs.fr/pierre-antoine.champin/enseignement/intro-js/s6.html)
+
+## Features
+- 60 FPS 2D animations
+- arcade, speedrun and puzzle game modes
+- touchscreen and controller support
+- playable at [snek.codinget.me](https://snek.codinget.me)
+
+## Dev dependencies
+- All the POSIX tools, most importantly a POSIX-compliant shell, `echo`, `rm`, `seq` and `sed`
+	- Busybox is known to work
+	- GNU Coreutils are known to work
+	- On Windows, WSL is known to work
+- Imagemagick, with the `convert` tool in the PATH
+- `bc`
+- Make
+- Node.js and npm, both in the PATH
+	- Node.js 10 and 12 are known to work
+	- node-gyp and python are required for the database
+		- (if you have already used native modules, you have them)
+
+## Prod dependencies (direct)
+- Node.js and npm, both in the PATH
+	- Node.js 10 and 12 are known to work
+	- node-gyp and python are required for the database
+		- (if you have already used native modules, you have them)
+
+## Prod dependencies (docker)
+- Docker
+
+## Running the game (dev)
+- `git clone` this repo
+- `npm install` the dependencies (this will also build the less and js and initialize the database)
+- `npm start` the server
+- `make` every time you change something
+
+## Running the game (prod, docker)
+- Get the [Dockerfile](https://gitdab.com/Codinget/Snek/raw/branch/master/Dockerfile)
+- `docker build` it
+- `docker run -it -p80:3000` the container
+- ideally, put it behind a reverse proxy
+
+## Running the game (prod, direct)
+- `git clone` this repo
+- `npm install` the dependencies (this will also build the less and js and initialize the database)
+- `npm start` the server
+
+## License
+[MIT](https://opensource.org/licenses/MIT)

api.js

@@ -0,0 +1,103 @@
+const DB=require('better-sqlite3');
+const {Router}=require('express');
+
+const db=new DB('db.sqlite');
+const api=new Router();
+
+const leaderboardSelect='SELECT username, score, length, time, speed FROM leaderboards';
+const getLeaderboardsBy={
+	score: db.prepare(`${leaderboardSelect} WHERE mode=? ORDER BY score DESC LIMIT ? OFFSET ?`),
+	timeA: db.prepare(`${leaderboardSelect} WHERE mode=? ORDER BY time  ASC  LIMIT ? OFFSET ?`),
+	timeD: db.prepare(`${leaderboardSelect} WHERE mode=? ORDER BY time  DESC LIMIT ? OFFSET ?`)
+};
+const addLeaderboard=db.prepare(`
+	INSERT
+		INTO leaderboards(mode, username, score, length, time, speed)
+		VALUES(@mode, @username, @score, @length, @time, @speed)
+`);
+
+const levelList=require('./assets/levelList.json');
+const validMode=mode => {
+	try {
+		const [category, name]=mode.split('/');
+		return levelList[category].levels.map(l => ''+l).includes(name);
+	} catch(e) {
+		return false;
+	}
+};
+
+api.get('/leaderboards/:category/:id', (req, res) => {
+	const sort=req.query.sort || 'score';
+	if(!['score', 'timeA', 'timeD'].includes(sort)) return res.status(400).json({
+		ok: false,
+		err: 'Invalid sort'
+	});
+	const results=+req.query.results || 20;
+	if((typeof results)!='number' || results<1 || results >100) return res.status(400).json({
+		ok: false,
+		err: 'Invalid result count'
+	});
+	const page=+req.query.page || 1;
+	if((typeof page)!='number' || page<1) return res.status(400).json({
+		ok: false,
+		err: 'Invalid page'
+	});
+
+	const data=getLeaderboardsBy[sort]
+		.all(req.params.category+'/'+req.params.id, results, (page-1)*results);
+	return res.status(200).json({
+		ok: true,
+		data
+	});
+});
+
+api.post('/leaderboards/:category/:id', (req, res) => {
+	const mode=req.params.category+'/'+req.params.id;
+	if((typeof mode)!='string' || !validMode(mode)) return res.status(400).json({
+		ok: false,
+		err: 'Invalid mode'
+	});
+	const username=req.body.username;
+	if((typeof username)!='string' || username.length>100) return res.status(400).json({
+		ok: false,
+		err: 'Invalid username'
+	});
+	const score=req.body.score;
+	if((typeof score)!='number' || score%1 || score<0) return res.status(400).json({
+		ok: false,
+		err: 'Invalid score'
+	});
+	const length=req.body.length;
+	if((typeof length)!='number' || length%1 || length<1) return res.status(400).json({
+		ok: false,
+		err: 'Invalid length'
+	});
+	const time=req.body.time;
+	if((typeof time)!='number' || time%1 || time<0) return res.status(400).json({
+		ok: false,
+		err: 'Invalid time'
+	});
+	const speed=req.body.speed;
+	if((typeof speed)!='number' || speed%1 || speed<0) return res.status(400).json({
+		ok: false,
+		err: 'Invalid speed'
+	});
+
+	try {
+		addLeaderboard.run({
+			mode, username,
+			score, length,
+			time, speed
+		});
+		res.json({
+			ok: true
+		});
+	} catch(e) {
+		res.status(500).json({
+			ok: false,
+			err: 'Failed to add score'
+		});
+	}
+});
+
+return module.exports=exports=api;

assets/config.json

@@ -0,0 +1,26 @@
+{
+	"debug": false,
+
+	"player.name": "Player",
+	"player.leaderboards": false,
+
+	"input.touchscreen.crosspad.enabled": false,
+	"input.touchscreen.crosspad.overlay": true,
+
+	"input.touchscreen.joystick.enabled": true,
+	"input.touchscreen.joystick.overlay": true,
+	"input.touchscreen.joystick.deadzone": 10,
+
+	"input.touchscreen.swipe.enabled": false,
+	"input.touchscreen.swipe.deadzone": 50,
+
+	"input.gamepad.enabled": true,
+	"input.gamepad.deadzone": 0.5,
+
+	"input.keyboard.enabled": true,
+
+	"input.buffer": false,
+
+	"appearance.grid": "none",
+	"appearance.timer": "both"
+}

assets/levelList.json

@@ -0,0 +1,65 @@
+{
+	"speedrun": {
+		"desc": "Get all the fruits as fast as possible without touching the walls",
+		"rules": {
+			"fruitRegrow": false,
+			"speedIncrease": false,
+			"worldWrap": false,
+			"winCondition": "fruit",
+			"scoreSystem": "speedrun",
+			"uploadOnDeath": false,
+			"leaderboardsSort": "timeA"
+		},
+		"levelFilename": "level<n>.json",
+		"levelDisplay": "Level <n>",
+		"levels": [
+			1, 2, 3, 4, 5
+		],
+		"nextLevel": true
+	},
+	"arcade": {
+		"desc": "Have fun just like in the good ol' days, walls wrap around, fruits respawn and speed increases",
+		"rules": {
+			"fruitRegrow": true,
+			"speedIncrease": true,
+			"speedMultiplier": 0.9,
+			"speedCap": 50,
+			"worldWrap": true,
+			"uploadOnDeath": true,
+			"leaderboardsSort": "score"
+		},
+		"levelFilename": "arcade-<l>.json",
+		"levelDisplay": "<n>",
+		"levels": [
+			"Arcade",
+			"Timed",
+			"Survival"
+		],
+		"nextLevel": false,
+		"levelDesc": [
+			"The old classic, try to get as high as a score as you can",
+			"Get a score as high as you can in 30 seconds",
+			"Survive for as long as you can in an increasingly difficult game"
+		]
+	},
+	"puzzle": {
+		"desc": "Time doesn't flow in these puzzles. Try getting the fruits in as little moves as possible",
+		"rules": {
+			"fruitRegrow": false,
+			"timeFlow": false,
+			"speedIncrease": false,
+			"worldWrap": false,
+			"winCondition": "fruit",
+			"scoreSystem": "moves",
+			"moveCount": 50,
+			"uploadOnDeath": false,
+			"leaderboardsSort": "score"
+		},
+		"levelFilename": "puzzle<n>.json",
+		"levelDisplay": "Level <n>",
+		"levels": [
+			1, 2, 3
+		],
+		"nextLevel": true
+	}
+}

assets/metaConfig.json

@@ -0,0 +1,146 @@
+{
+	"player": {
+		"name": "Player settings"
+	},
+	"player.name": {
+		"name": "Player name",
+		"type": "string"
+	},
+	"player.leaderboards": {
+		"name": "Upload scores to leaderboards",
+		"type": "boolean",
+		"needsBackend": true
+	},
+
+	"input": {
+		"name": "Input settings"
+	},
+
+	"input.buffer": {
+		"name": "Enable input buffering",
+		"type": "boolean"
+	},
+
+	"input.touchscreen": {
+		"name": "Touchscreen settings"
+	},
+
+	"input.touchscreen.crosspad": {
+		"name": "Crosspad mode"
+	},
+	"input.touchscreen.crosspad.enabled": {
+		"name": "Enable crosspad",
+		"type": "boolean",
+		"excludes": [
+			"input.touchscreen.joystick.enabled",
+			"input.touchscreen.swipe.enabled"
+		]
+	},
+	"input.touchscreen.crosspad.overlay": {
+		"name": "Show overlay",
+		"type": "boolean",
+		"parent": "input.touchscreen.crosspad.enabled"
+	},
+
+	"input.touchscreen.joystick": {
+		"name": "Joystick mode"
+	},
+	"input.touchscreen.joystick.enabled": {
+		"name": "Enable joystick",
+		"type": "boolean",
+		"excludes": [
+			"input.touchscreen.crosspad.enabled",
+			"input.touchscreen.swipe.enabled"
+		]
+	},
+	"input.touchscreen.joystick.overlay": {
+		"name": "Show overlay",
+		"type": "boolean",
+		"parent": "input.touchscreen.joystick.enabled"
+	},
+	"input.touchscreen.joystick.deadzone": {
+		"name": "Deadzone",
+		"type": "number",
+		"parent": "input.touchscreen.joystick.enabled",
+		"bounds": {
+			"min": 1,
+			"max": 100,
+			"inc": 1
+		}
+	},
+
+	"input.touchscreen.swipe": {
+		"name": "Swipe mode"
+	},
+	"input.touchscreen.swipe.enabled": {
+		"name": "Enable swipe",
+		"type": "boolean",
+		"excludes": [
+			"input.touchscreen.crosspad.enabled",
+			"input.touchscreen.joystick.enabled"
+		]
+	},
+	"input.touchscreen.swipe.deadzone": {
+		"name": "Deadzone",
+		"type": "number",
+		"parent": "input.touchscreen.swipe.enabled",
+		"bounds": {
+			"min": 1,
+			"max": 100,
+			"inc": 1
+		}
+	},
+
+	"input.gamepad": {
+		"name": "Gamepad settings"
+	},
+	"input.gamepad.enabled": {
+		"name": "Enable gamepad",
+		"type": "boolean"
+	},
+	"input.gamepad.deadzone": {
+		"name": "Deadzone",
+		"type": "number",
+		"parent": "input.gamepad.enabled",
+		"bounds": {
+			"min": 0,
+			"max": 1,
+			"inc": 0.1
+		}
+	},
+
+	"input.keyboard": {
+		"name": "Keyboard settings"
+	},
+	"input.keyboard.enabled": {
+		"name": "Enable keyboard",
+		"type": "boolean"
+	},
+
+	"appearance": {
+		"name": "Appearance"
+	},
+	"appearance.grid": {
+		"name": "Grid type",
+		"type": "choice",
+		"bounds": {
+			"choices": [
+				"none",
+				"grid",
+				"checkerboard"
+			]
+		}
+	},
+	"appearance.timer": {
+		"name": "Timer display",
+		"type": "choice",
+		"bounds": {
+			"choices": [
+				"none",
+				"border",
+				"number",
+				"both"
+			]
+		}
+	}
+}

assets/snake.json

@@ -0,0 +1,8 @@
+{
+	"color": "#fba49b",
+	"join": "round",
+	"cap": "round",
+	"headSize": 0.8,
+	"tailSize": 0.4,
+	"tailWrapSize": 0.1
+}

index.js

@@ -0,0 +1,16 @@
+const express=require('express');
+
+const app=express();
+const PORT=process.env.PORT || 3000;
+
+app.use(express.json());
+app.use(express.static('public'));
+
+app.use('/api', require('./api'));
+app.get('/api/has-nodejs', (req, res) => {
+	res.json("yes");
+});
+
+app.listen(PORT, () => {
+	console.log(`Listening on 0.0.0.0:${PORT}`);
+});

init.sql

@@ -0,0 +1,8 @@
+CREATE TABLE leaderboards (
+	mode TEXT,
+	username TEXT,
+	score INTEGER,
+	length INTEGER,
+	time INTEGER,
+	speed INTEGER
+);

install.js

@@ -0,0 +1,19 @@
+const DB=require('better-sqlite3');
+const fs=require('fs');
+const child_process=require('child_process');
+
+// prepare database
+console.log('Preparing database');
+if(fs.existsSync('db.sqlite')) fs.unlinkSync('db.sqlite');
+const db=new DB('db.sqlite');
+db.exec(fs.readFileSync('init.sql', 'utf8'));
+
+// compile less
+console.log('Compiling less');
+child_process.execFileSync('node_modules/.bin/lessc', ['src/less/snek.less', 'public/css/snek.css']);
+
+// merge js
+console.log('Merging js');
+const jsFiles=fs.readdirSync('src/js').map(f => 'src/js/'+f);
+const merged=child_process.execFileSync('node', ['mergejs.js', ...jsFiles]);
+fs.writeFileSync('public/js/snek.js', merged);

levels/arcade-arcade.json

@@ -0,0 +1,16 @@
+{
+	"dimensions": [32, 32],
+	"delay": 200,
+	"food": [
+		[16, 16]
+	],
+	"snake": [
+		[16, 12],
+		[16, 11],
+		[16, 10]
+	],
+	"rules": {
+		"superFruitGrow": true,
+		"decayingFruitGrow": true
+	}
+}

levels/arcade-survival.json

@@ -0,0 +1,50 @@
+{
+	"world": [
+		"               w               ",
+		"               w               ",
+		"  wwwwwww      w      wwwwwww  ",
+		"  w                         w  ",
+		"  w                         w  ",
+		"  w      wwwwwwwwwwwww      w  ",
+		"  w                         w  ",
+		"  w                         w  ",
+		"  w            w            w  ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"www  w  wwwwwwwwwwwwwww  w  www",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"  w            w            w  ",
+		"  w                         w  ",
+		"  w                         w  ",
+		"  w      wwwwwwwwwwwww      w  ",
+		"  w                         w  ",
+		"  w                         w  ",
+		"  wwwwwww      w      wwwwwww  ",
+		"               w               ",
+		"               w               "
+	],
+	"delay": 200,
+	"snake": [
+		[16, 3],
+		[15, 3],
+		[14, 3]
+	],
+	"rules": {
+		"worldWrap": false,
+		"autoSpeedIncrease": true,
+		"autoSpeadIncreaseTicks": 10,
+		"autoSizeGrow": true,
+		"autoSizeGrowTicks": 100,
+		"scoreSystem": "survival",
+		"leaderboardsSort": "timeD"
+	}
+}

levels/arcade-timed.json

@@ -0,0 +1,17 @@
+{
+	"dimensions": [32, 32],
+	"delay": 100,
+	"food": [
+		[16, 5]
+	],
+	"snake": [
+		[16, 12],
+		[16, 11],
+		[16, 10]
+	],
+	"rules": {
+		"speedMultiplier": 0.8,
+		"gameDuration": 30000,
+		"winCondition": "time"
+	}
+}

levels/level1.json

@@ -0,0 +1,15 @@
+{
+    "dimensions": [80, 40],
+    "delay": 200,
+    "walls": [
+        [5,5], [5,6], [5,7], [5,8], [70, 35], [71, 35], [72, 35]
+    ],
+    "food": [
+        [10,10]
+    ],
+    "snake": [
+      [60,20],
+      [60,19],
+      [60,18]
+    ]
+}

levels/level2.json

@@ -0,0 +1,23 @@
+{
+	"world": [
+		"                    ",
+		"          f         ",
+		"   fw     w     wf  ",
+		"                    ",
+		"                    ",
+		"                    ",
+		"                    ",
+		"                    ",
+		"                    ",
+		"                    ",
+		"          w         ",
+		"          f         "
+	],
+	"snake": [
+		[6,6],
+		[6,7],
+		[6,8],
+		[6,9]
+	],
+	"delay": 150
+}

levels/level3.json

@@ -0,0 +1,41 @@
+{
+	"world": [
+		"               w               ",
+		"               w               ",
+		"  wwwwwww      w      wwwwwww  ",
+		"  w            f            w  ",
+		"  w                         w  ",
+		"  w      wwwwwwwwwwwww      w  ",
+		"  w                         w  ",
+		"  w            f            w  ",
+		"  w            w            w  ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"wwwf w fwwwwwwwwwwwwwwwf w fwww",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"     w         w         w     ",
+		"  w            w            w  ",
+		"  w            f            w  ",
+		"  w                         w  ",
+		"  w      wwwwwwwwwwwww      w  ",
+		"  w                         w  ",
+		"  w            f            w  ",
+		"  wwwwwww      w      wwwwwww  ",
+		"               w               ",
+		"               w               "
+	],
+	"delay": 200,
+	"snake": [
+		[16, 4],
+		[15, 4],
+		[14, 4]
+	]
+}

levels/level4.json

@@ -0,0 +1,39 @@
+{
+	"world": [
+		"               o               ",
+		"               o               ",
+		"    ooooo      o      ooooo    ",
+		"               f               ",
+		"  o                         o  ",
+		"  o      ooooooooooooo      o  ",
+		"  o                         o  ",
+		"  o            f            o  ",
+		"  o            o            o  ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o                   o     ",
+		"ooof o foooooo   oooooof o fooo",
+		"     o                   o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"     o         o         o     ",
+		"  o            o            o  ",
+		"  o            f            o  ",
+		"  o                         o  ",
+		"  o      ooooooooooooo      o  ",
+		"  o                         o  ",
+		"               f               ",
+		"    ooooo      o      ooooo    ",
+		"               o               ",
+		"               o               "
+	],
+	"delay": 100,
+	"snake": [
+		[16, 4]
+	]
+}

levels/level5.json

@@ -0,0 +1,17 @@
+{
+	"world": [
+		"       f      f",
+		"       o       ",
+		"       o       ",
+		"       w       ",
+		"wwwooowwiIIIIIf",
+		"    f  I       ",
+		"       I       ",
+		"       I       ",
+		"       i      f"
+	],
+	"delay": 200,
+	"snake": [
+		[0, 0]
+	]
+}

levels/puzzle1.json

@@ -0,0 +1,21 @@
+{
+	"dimensions": [15, 10],
+	"walls": [
+		[5, 0], [5, 1], [5, 2], [5, 3], [5, 4], [5, 5], [5, 6], [5, 7], [5, 8], [5, 9],
+		[10, 0], [10, 1], [10, 2], [10, 3], [10, 4], [10, 5], [10, 6], [10, 7], [10, 8], [10, 9]
+	],
+	"food": [
+		[4, 5],
+		[8, 7],
+		[14, 9]
+	],
+	"snake": [
+		[0, 0]
+	],
+	"portals": {
+		"a": [4, 9],
+		"b": [6, 0],
+		"c": [9, 9],
+		"d": [11, 0]
+	}
+}

levels/puzzle2.json

@@ -0,0 +1,13 @@
+{
+	"world": [
+		"k      wA        wf",
+		"       w         wB",
+		"       w         ww",
+		"      fw           ",
+		"       w           ",
+		"       K          f"
+	],
+	"snake": [
+		[0, 5]
+	]
+}

levels/puzzle3.json

@@ -0,0 +1,22 @@
+{
+	"world": [
+		"A          i   B",
+		"           i   s",
+		"          Cik   ",
+		"SSSSSSSSSSSiiiii",
+		"           i   f",
+		"           i    ",
+		"     s     itttt",
+		"     t     wKKKK",
+		"           w    ",
+		"           wD   "
+	],
+	"snake": [
+		[0, 9],
+		[1, 9],
+		[2, 9]
+	],
+	"rules": {
+		"moveCount": 60
+	}
+}

mergejs.js

@@ -0,0 +1,30 @@
+const fs=require('fs');
+
+const requireFn=`
+const require=function require(name) {
+	if(require.cache[name]) return require.cache[name];
+	if(!require.source[name]) throw new Error("Cannot require "+name+": not found");
+	require.cache[name]=require.source[name]({}) || true;
+	return require.cache[name];
+};
+require.cache=Object.create(null);
+require.source=Object.create(null);
+window.require=require;
+`;
+
+let outputCode=[requireFn];
+process.argv
+	.slice(2)
+	.map(a => [a, a.match(/([a-zA-Z_][a-zA-Z0-9_-]*).js$/)[1]])
+	.forEach(([modFile, modName]) => {
+		const modSource=fs.readFileSync(modFile, 'utf8');
+		outputCode.push(`
+require.source['${modName}']=(a => a.bind(a)) (function ${modName}(module) {
+'use strict';
+${modSource}
+});
+		`);
+	});
+
+fs.writeSync(1, outputCode.map(a => a.trim()).join('\n'));
+

package.json

@@ -0,0 +1,21 @@
+{
+  "name": "snek",
+  "version": "1.0.0",
+  "description": "A simple Snake",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js",
+    "prepare": "node install.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git@ssh.gitdab.com:Codinget/Snek.git"
+  },
+  "author": "Codinget",
+  "license": "MIT",
+  "dependencies": {
+    "better-sqlite3": "^6.0.1",
+    "express": "^4.17.1",
+    "less": "^3.11.1"
+  }
+}

public/assets/config.json

@@ -0,0 +1 @@
+../../assets/config.json

public/assets/levelList.json

@@ -0,0 +1 @@
+../../assets/levelList.json

public/assets/metaConfig.json

@@ -0,0 +1 @@
+../../assets/metaConfig.json

public/assets/snake.json

@@ -0,0 +1 @@
+../../assets/snake.json

public/help.html

@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>Snek - Help</title>
+		<meta charset="UTF-8">
+		<link rel="favicon" href="favicon.ico">
+		<link rel="stylesheet" href="css/snek.css">
+	</head>
+	<body>
+		<main class="help">
+			<article>
+				<h2>Controls</h2>
+				<p>
+					On keyboard, the game is played with the arrow keys.<br>
+					You can use the <code>f</code> key to go fullscreen.<br>
+					You can also use the <code>r</code> key to quickly restart a game.<br>
+				</p>
+				<p>
+					On mobile or with a touchscreen, the game can be played in 3 modes.<br>
+					In crosspad mode, the screen is divided into 4 regions, and each one corresponds to a direction.<br>
+					In joystick mode, the point where you press your finger is the center of a virtual joystick, and moving it will trigger the directions.<br>
+					In swipe mode, you just swipe to move.
+				</p>
+			</article>
+			<article>
+				<h2>Game modes</h2>
+				<section>
+					<h3>Speedrun mode</h3>
+					<p>
+						In speedrun mode, the goal is to collect all the fruits as fast as possible.<br>
+						Attempting to go through the edge of the playfield will kill you.<br>
+						Each level introduces a new mechanic.
+					</p>
+				</section>
+				<section>
+					<h3>Arcade</h3>
+					<p>
+						Arcade mode is mostly like the classics.<br>
+						In arcade mode, you can go through the edge of the playfield and come out on the other side.<br>
+						Super fruits and decaying fruits may also appear. They are worth <em>10</em> and <em>5</em> points respectively.
+					</p>
+				</section>
+				<section>
+					<h3>Timed</h3>
+					<p>
+						Timed mode is a bare-bones mode with a looping playfield.<br>
+						A timed game only lasts for 30 seconds, and the goal is to get as high a score as possible.
+					</p>
+				</section>
+				<section>
+					<h3>Survival</h3>
+					<p>
+						In survival mode, the playfield doesn't loop, fruits don't spawn, and you can't win.<br>
+						This modes get progressively harder, with speed increases, and snake growth.<br>
+						At first, this process is slow, but it gets faster with time.
+					</p>
+				</section>
+				<section>
+					<h3>Puzzle mode</h3>
+					<p>
+						In puzzle mode, time doesn't flow until you move.<br>
+						Weird tiles make their debut, like portals, keys, etc.<br>
+						Your goal is to get the fruits in as little moves as you can.
+					</p>
+				</section>
+			</article>
+			<article>
+				<h2>Tiles</h2>
+				<ul>
+					<li><em>Walls</em> kill you if you touch them</li>
+					<li><em>Fruits</em> give you one point and make you grow. In arcade gamemodes, they also make the game go faster</li>
+					<li><em>Holes</em> kill you if the entire snake is over a hole, or the head and 3 subsequent tiles are over a hole</li>
+					<li><em>Fire</em> kills you if you touch it</li>
+					<li><em>Oil</em> is flammable and will periodically catch on fire, which will kill you. It is otherwise perfectly safe</li>
+					<li><em>Super fruits</em> give you 10 points, and sometimes spawn in arcade mode</li>
+					<li><em>Decaying fruits</em> give you 5 points and sometimes spawn in arcade mode, but they also decay after 2 seconds and disappear</li>
+					<li><em>Portals</em> teleport you to the corresponding portal</li>
+					<li><em>Keys</em> make <em>Doors</em> disappear</li>
+					<li><em>Switches</em> enable or disable <em>Spikes</em></li>
+				</ul>
+			</article>
+		</main>
+	</body>
+</html>

public/index.html

@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>Snek</title>
+		<meta charset="UTF-8">
+		<link rel="favicon" href="favicon.ico">
+		<link rel="stylesheet" href="css/snek.css">
+		<script src="js/snek.js"></script>
+		<script>
+			window.addEventListener('load', () => require('main'));
+		</script>
+	</head>
+	<body class="loading">
+		<header>
+			<a href="#"><img src="assets/icon256.png"></a>
+			<h1>Snek</h1>
+			<h2>A "simple" Snake</h2>
+			<ul>
+				<li><a href="#">Menu</a></li>
+				<li class="loaded"><a href="#settings">Config</a></li>
+				<li class="loaded"><a href="#help">Help</a></li>
+				<li class="server loaded"><a href="#leaderboards">Leaderboards</a></li>
+			</ul>
+		</header>
+		<main>
+			<nav></nav>
+			<canvas class="hidden"></canvas>
+			<div id="hud" class="hidden">
+				<div class="status">
+					<span class="speed"></span>
+					<span class="score"></span>
+					<span class="time"></span>
+				</div>
+			</div>
+		</main>
+		<footer>
+			<img src="assets/icon32.png">
+			<p>
+				Snek by <a href="https://codinget.me">Codinget</a> on <a href="https://gitdab.com/Codinget/Snek">GitDab</a>
+				<span class="serverless loaded">running without Nodejs backend</span>
+			</p>
+			<p>
+				Original <a href="https://perso.liris.cnrs.fr/pierre-antoine.champin/enseignement/intro-js/s6.html">subject</a> by <a href="https://perso.liris.cnrs.fr/pierre-antoine.champin/">P.A. Champin</a>
+			</p>
+		</footer>
+	</body>
+</html>

public/levels

@@ -0,0 +1 @@
+../levels/

src/js/assets.js

@@ -0,0 +1,142 @@
+const ProgressBar=require('progress');
+
+const assetSpecs=[
+	{ name: 'fruit',      filename: 'apple32.png',            type: 'image' },
+	{ name: 'superFruit', filename: 'peach-rainbow-anim.png', type: 'image' },
+	{ name: 'decayFruit', filename: 'peach-decay-anim.png',   type: 'image' },
+	{ name: 'wall',       filename: 'wall32.png',             type: 'image' },
+	{ name: 'flammable',  filename: 'oil32.png',              type: 'image' },
+	{ name: 'hole',       filename: 'hole-ts.png',            type: 'image' },
+	{ name: 'fire',       filename: 'fire-anim.png',          type: 'image' },
+	{ name: 'portalA',    filename: 'portal-a-anim.png',      type: 'image' },
+	{ name: 'portalB',    filename: 'portal-b-anim.png',      type: 'image' },
+	{ name: 'portalC',    filename: 'portal-c-anim.png',      type: 'image' },
+	{ name: 'portalD',    filename: 'portal-d-anim.png',      type: 'image' },
+	{ name: 'key',        filename: 'key32.png',              type: 'image' },
+	{ name: 'door',       filename: 'door32.png',             type: 'image' },
+	{ name: 'switch',     filename: 'switch-ts.png',          type: 'image' },
+	{ name: 'spikes',     filename: 'spikes-ts.png',          type: 'image' },
+	{ name: 'snake',      filename: 'snake.json',             type: 'json'  },
+	{ name: 'levelList',  filename: 'levelList.json',         type: 'json'  },
+	{ name: 'config',     filename: 'config.json',            type: 'json'  },
+	{ name: 'metaConfig', filename: 'metaConfig.json',        type: 'json'  }
+];
+
+const tasks=[
+	{ from: 'hole',       type: 'tileset',   steps: 1, tiles: ['base', 'ul', 'dr', 'dl', 'ur', 'l', 'r', 'd', 'u'] },
+	{ from: 'fire',       type: 'animation', steps: 3 },
+	{ from: 'portalA',    type: 'animation', steps: 3 },
+	{ from: 'portalB',    type: 'animation', steps: 3 },
+	{ from: 'portalC',    type: 'animation', steps: 3 },
+	{ from: 'portalD',    type: 'animation', steps: 3 },
+	{ from: 'superFruit', type: 'animation', steps: 5 },
+	{ from: 'decayFruit', type: 'animation', steps: 5 },
+	{ from: 'switch',     type: 'tileset',   steps: 1, tiles: ['on', 'off'] },
+	{ from: 'spikes',     type: 'tileset',   steps: 1, tiles: ['off', 'on'] }
+];
+
+const cvs=document.createElement('canvas');
+cvs.width=400;
+cvs.height=50;
+cvs.classList.add('progressBar');
+cvs.classList.add('hiddenBottom');
+
+const bar=new ProgressBar(assetSpecs.length*2+tasks.reduce((a, t) => a+t.steps, 0));
+bar.addUpdateListener(() => bar.draw(cvs, '#fba49b', '#930a16'));
+bar.draw(cvs, '#fba49b', '#930a16');
+
+document.body.appendChild(cvs);
+setTimeout(() => cvs.classList.remove('hiddenBottom'), 0);
+
+bar.addReadyListener(() => {
+	cvs.classList.add('hiddenBottom');
+	setTimeout(() => document.body.removeChild(cvs), 1000);
+});
+
+//XXX purposefully slow down asset loading
+const sleep=(ms=500) => new Promise(ok => setTimeout(ok, ms*Math.random()));
+
+const loadAsset=async (asset) => {
+	const response=await fetch('assets/'+asset.filename);
+	await sleep();
+	bar.update();
+	let result;
+	switch(asset.type) {
+		case 'json':
+			result=await response.json();
+			break;
+
+		case 'image':
+			result=await createImageBitmap(await response.blob());
+			break;
+	}
+	await sleep();
+	bar.update();
+	return [asset.name, result];
+};
+
+let assets=Object.create(null);
+let ready=false;
+let readyListeners=[];
+
+(async () => {
+	let arr=await Promise
+		.all(
+			assetSpecs.map(a => loadAsset(a))
+		);
+
+	arr.forEach(([name, value]) => {
+		assets[name]=value;
+	});
+
+	for(let task of tasks) {
+		const source=assets[task.from];
+		switch(task.type) {
+			case 'tileset': {
+				let asset=assets[task.from]=Object.create(null);
+				for(let tId in task.tiles) {
+					const tName=task.tiles[tId];
+					asset[tName]=await createImageBitmap(source, 0, source.width*tId, source.width, source.width);
+					if(tId%(task.tiles.length/task.steps)==0) {
+						await sleep(100);
+						bar.update();
+					}
+				}
+				break;
+			}
+
+			case 'animation': {
+				let anim=assets[task.from]=[];
+				let frameCount=source.height/source.width;
+				for(let i=0; i<frameCount; i++) {
+					anim[i]=await createImageBitmap(source, 0, source.width*i, source.width, source.width);
+					if(i%(frameCount/task.steps)==0) {
+						await sleep(100);
+						bar.update();
+					}
+				}
+				break;
+			}
+		}
+	}
+
+	ready=true;
+	readyListeners.forEach(fn => fn.bind(fn)());
+	readyListeners=null;
+})();
+
+const onReady=(fn) => {
+	if(ready) fn.bind(fn)();
+	else readyListeners.push(fn);
+};
+
+const get=(name) => {
+	let asset=assets[name];
+	if(!asset) throw new Error("Unknown asset: "+name);
+	return asset;
+};
+
+return {
+	onReady, get
+};
+

src/js/config.js

@@ -0,0 +1,81 @@
+const assets=require('assets');
+
+let watchers=Object.create(null);
+let lastWatchCode=1;
+
+const toBoolean=v => {
+	if(v=='false' || v==false) return false;
+	return true;
+};
+const notify=(key, value) => {
+	const interested=watchers[key];
+	if(interested) Object
+		.keys(interested)
+		.map(key => interested[key])
+		.forEach(fn => fn(key, value));
+};
+
+const get=key => {
+	let confVal=localStorage.getItem('config.'+key);
+	if(confVal===null) return assets.get('config')[key];
+	return confVal;
+};
+const getB=key => toBoolean(get(key));
+const getN=key => +get(key);
+const getS=key => ''+get(key);
+
+const set=(key, value) => {
+	localStorage.setItem('config.'+key, value);
+	notify(key, value);
+};
+
+const remove=key => {
+	localStorage.removeItem('config.'+key, value);
+	notify(key, assets.get('config')[key]);
+};
+const clear=() =>
+	Object
+		.keys(assets.get('config'))
+		.forEach(remove);
+
+const watch=(key, fn) => {
+	if(!watchers[key]) watchers[key]=[];
+	const code='w'+lastWatchCode++;
+	watchers[key][code]=fn;
+	return code;
+};
+const watchB=(key, fn) => watch(key, (k, v) => fn(k, toBoolean(v)));
+const watchN=(key, fn) => watch(key, (k, v) => fn(k, +v));
+const watchS=(key, fn) => watch(key, (k, v) => fn(k, ''+v));
+
+const unwatch=(key, code) => {
+	if(!watchers[key]) return;
+	delete watchers[key][code];
+};
+
+const list=() =>
+	Object
+		.keys(assets.get('config'));
+const dict=() => {
+	let dict=Object.create(null);
+	Object
+		.keys(assets.get('config'))
+		.forEach(
+			key => dict[key]={
+				raw: get(key),
+				b: getB(key),
+				n: getN(key),
+				s: getS(key)
+			}
+		);
+	return dict;
+};
+
+return module.exports={
+	get, getB, getN, getS,
+	set,
+	remove, clear,
+	watch, watchB, watchN, watchS,
+	unwatch,
+	list, dict
+};

src/js/configEditor.js

@@ -0,0 +1,111 @@
+const config=require('config');
+const assets=require('assets');
+const Popup=require('popup');
+
+let lastCEId=0;
+class ConfigEditor extends Popup {
+	constructor() {
+		super("Config editor", [], {ok: "OK"});
+
+		const metaConfig=assets.get('metaConfig');
+
+		this.watchers=[];
+
+		for(let key in metaConfig) {
+			const level=Array.from(key).reduce((a, c) => a+c=='.', 0)+2;
+			const data=metaConfig[key];
+
+			if(!data.type) {
+				this.addHeading(data.name);
+			} else {
+				let span=document.createElement('span');
+				let id='cfgInput-'+(lastCEId++)+'-'+key.replace(/\./g, '-');
+				let label=span.appendChild(document.createElement('label'));
+				label.innerText=data.name;
+				if(config.getB('debug')) label.title=key;
+
+				let input;
+				if(data.type=='boolean') {
+					input=document.createElement('input');
+					input.type='checkbox';
+					input.checked=config.getB(key);
+					input.addEventListener('change', () => config.set(key, input.checked));
+				} else if(data.type=='choice') {
+					input=document.createElement('select');
+					data.bounds.choices.forEach(choice => {
+						let option=document.createElement('option');
+						option.value=choice;
+						option.innerText=choice;
+						input.appendChild(option);
+					});
+					input.value=config.getS(key);
+					input.addEventListener('change', () => config.set(key, input.value));
+				} else if(data.type=='number') {
+					input=document.createElement('input');
+					input.type='number';
+					if(data.bounds) {
+						input.setAttribute('min', data.bounds.min);
+						input.setAttribute('max', data.bounds.max);
+						input.setAttribute('step', data.bounds.inc);
+					}
+					input.value=config.getN(key);
+					input.addEventListener('change', () => config.set(key, input.value));
+				} else if(data.type=='string') {
+					input=document.createElement('input');
+					input.type='text';
+					input.value=config.getS(key);
+					input.addEventListener('change', () => config.set(key, input.value));
+				}
+
+				input.setAttribute('id', id);
+				span.appendChild(input);
+				label.setAttribute('for', id);
+				this.addContent(span);
+
+				if(data.excludes) {
+					const setEnabled=() => {
+						input.disabled=
+							data.excludes
+								.some(key => config.getB(key));
+						input.title=input.disabled?`Disable '${data.excludes.map(k => metaConfig[k].name).join('\', \'')}' to enable`:'';
+					};
+
+					setEnabled();
+					data.excludes.forEach(key => {
+						let c=config.watchB(key, setEnabled);
+						this.watchers.push([key, c]);
+					});
+				} else if(data.parent) {
+					const setEnabled=() => {
+						input.disabled=!config.getB(data.parent);
+						input.title=input.disabled?`Enable '${metaConfig[data.parent].name}' to enable`:'';
+					};
+
+					setEnabled();
+					let c=config.watchB(data.parent, setEnabled);
+					this.watchers.push([data.parent, c]);
+				}
+				if(data.needsBackend) {
+					if(window.serverless) {
+						input.disabled=true;
+						input.title="Needs backend";
+					}
+				}
+			}
+		}
+
+		this.large=true;
+	}
+
+	discard() {
+		this.watchers.forEach(([k, c]) => config.unwatch(k, c));
+	}
+};
+
+return module.exports={
+	show: async () => {
+		let editor=new ConfigEditor();
+		await editor.display();
+		editor.discard();
+	}
+};

src/js/input.js

@@ -0,0 +1,291 @@
+const config=require('config');
+
+let currentInputs={};
+let handlers=[];
+let hud;
+
+const toAngleMagnitude=(x, y) => {
+	return {
+		angle: ((Math.atan2(x, y)+2*Math.PI)%(2*Math.PI))/Math.PI,
+		magnitude: Math.hypot(x, y)
+	};
+};
+
+const handleAngleMagnitude=(x, y, threshold=0, fn=null) => {
+	const {angle, magnitude}=toAngleMagnitude(x, y);
+
+	if(magnitude>threshold) {
+		let inputs=currentInputs;
+		if(angle>.25 && angle <.75) inputs.right=true;
+		else if(angle>.75 && angle<1.25) inputs.up=true;
+		else if(angle>1.25 && angle<1.75) inputs.left=true;
+		else inputs.down=true;
+
+		if(fn) fn(angle, magnitude);
+	}
+};
+
+const removeChild=(parent, child) => {
+	if(child.parentNode==parent) parent.removeChild(child);
+};
+
+const handleCrosspad=(() => {
+	const ns='http://www.w3.org/2000/svg';
+	const cross=document.createElementNS(ns, 'svg');
+	cross.classList.add('crosspadOverlay');
+	cross.setAttribute('width', 1000);
+	cross.setAttribute('height', 1000);
+	let dr=document.createElementNS(ns, 'line');
+	dr.setAttribute('x1', 0);
+	dr.setAttribute('y1', 0);
+	dr.setAttribute('x2', 1000);
+	dr.setAttribute('y2', 1000);
+	dr.setAttribute('stroke', 'black');
+	cross.appendChild(dr);
+	let dl=document.createElementNS(ns, 'line');
+	dl.setAttribute('x1', 1000);
+	dl.setAttribute('y1', 0);
+	dl.setAttribute('x2', 0);
+	dl.setAttribute('y2', 1000);
+	dl.setAttribute('stroke', 'black');
+	cross.appendChild(dl);
+
+	let useOverlay=false;
+	let enabled=false;
+	const displayOverlay=() => {
+		if(useOverlay && enabled) hud.appendChild(cross);
+		else removeChild(hud, cross);
+	};
+	config.watchB('input.touchscreen.crosspad.overlay', (k, v) => {
+		useOverlay=v;
+		displayOverlay();
+	});
+
+	const fn=e =>
+		handleAngleMagnitude(
+			e.touches[0].clientX-window.innerWidth/2,
+			e.touches[0].clientY-window.innerHeight/2,
+			0,
+			null
+		);
+
+	const init=() => {
+		useOverlay=config.getB('input.touchscreen.crosspad.overlay');
+		enabled=true;
+		displayOverlay();
+	};
+	const fini=() => {
+		enabled=false;
+		displayOverlay();
+	};
+
+	return {
+		touchstart: fn,
+		touchmove: fn,
+		init, fini
+	};
+})();
+
+const handleKeyboard={
+	keydown: e => {
+		let inputs=currentInputs;
+		if(e.key=='ArrowUp') inputs.up=true;
+		else if(e.key=='ArrowDown') inputs.down=true;
+		else if(e.key=='ArrowLeft') inputs.left=true;
+		else if(e.key=='ArrowRight') inputs.right=true;
+	}
+};
+
+const handleJoystick=(() => {
+	let cvs=document.createElement('canvas');
+	cvs.classList.add('joystickOverlay');
+	let ctx=cvs.getContext('2d');
+	let enabled=false;
+	let useOverlay=false;
+	let firstTouch=false;
+
+	let center={
+		x: 0,
+		y: 0
+	};
+	let deadzone;
+
+	const displayOverlay=() => {
+		if(!enabled || !useOverlay || !firstTouch) return removeChild(hud, cvs);
+
+		cvs.width=cvs.height=4*deadzone+120;
+		hud.appendChild(cvs);
+		ctx.clearRect(0, 0, cvs.width, cvs.width);
+
+		ctx.strokeStyle='black';
+		ctx.lineWidth=1;
+		ctx.beginPath();
+		const rad=2*deadzone+50;
+		ctx.moveTo(rad*Math.cos(Math.PI/4)+cvs.width/2, rad*Math.sin(Math.PI/4)+cvs.width/2);
+		ctx.lineTo(rad*Math.cos(Math.PI/4+Math.PI)+cvs.width/2, rad*Math.sin(Math.PI/4+Math.PI)+cvs.width/2);
+		ctx.moveTo(rad*Math.cos(-Math.PI/4)+cvs.width/2, rad*Math.sin(-Math.PI/4)+cvs.width/2);
+		ctx.lineTo(rad*Math.cos(-Math.PI/4+Math.PI)+cvs.width/2, rad*Math.sin(-Math.PI/4+Math.PI)+cvs.width/2);
+		ctx.stroke();
+
+		ctx.strokeStyle='gray';
+		ctx.lineWidth=2;
+		ctx.beginPath();
+		ctx.ellipse(cvs.width/2, cvs.width/2, deadzone, deadzone, 0, 0, Math.PI*2);
+		ctx.stroke();
+		ctx.lineWidth=3;
+		ctx.beginPath();
+		ctx.ellipse(cvs.width/2, cvs.width/2, deadzone*2+50, deadzone*2+50, 0, 0, Math.PI*2);
+		ctx.stroke();
+
+		cvs.style.left=center.x+'px';
+		cvs.style.top=center.y+'px';
+	};
+
+	const init=() => {
+		enabled=true;
+		deadzone=config.getN('input.touchscreen.joystick.deadzone');
+		useOverlay=config.getB('input.touchscreen.joystick.overlay');
+		displayOverlay();
+	};
+	const fini=() => {
+		enabled=false;
+		displayOverlay();
+	};
+	config.watchN('input.touchscreen.joystick.deadzone', (k, v) => {
+		deadzone=v;
+		displayOverlay();
+	});
+	config.watchB('input.touchscreen.joystick.overlay', (k, v) => {
+		useOverlay=v;
+		displayOverlay();
+	});
+
+	return {
+		init, fini,
+		touchstart: e => {
+			center.x=e.touches[0].clientX;
+			center.y=e.touches[0].clientY;
+			firstTouch=true;
+			displayOverlay();
+		},
+		touchmove: e =>
+			handleAngleMagnitude(
+				e.touches[0].clientX-center.x,
+				e.touches[0].clientY-center.y,
+				deadzone,
+				null
+			)
+	}
+})();
+
+const handleSwipe=(() => {
+	let center={
+		x: 0,
+		y: 0
+	};
+	let deadzone;
+
+	let resetCenter=e => {
+		center.x=e.touches[0].clientX;
+		center.y=e.touches[0].clientY;
+	};
+
+	const init=() => {
+		deadzone=config.getN('input.touchscreen.swipe.deadzone');
+	};
+	config.watchN('input.touchscreen.swipe.deadzone', (k, v) => {
+		deadzone=v;
+	});
+
+	return {
+		init,
+		touchstart: resetCenter,
+		touchmove: e =>
+			handleAngleMagnitude(
+				e.touches[0].clientX-center.x,
+				e.touches[0].clientY-center.y,
+				deadzone,
+				() => resetCenter(e)
+			)
+	}
+})();
+
+const handleGamepads=(() => {
+	let deadzone;
+
+	const init=() => {
+		deadzone=config.getN('input.touchscreen.swipe.deadzone');
+	};
+	config.watchN('input.touchscreen.swipe.deadzone', (k, v) => {
+		deadzone=v;
+	});
+
+	return {
+		init,
+		frame: () => {
+			const gp=navigator.getGamepads()[0];
+			let inputs=currentInputs;
+			if(!gp || !gp.axes) return;
+
+			handleAngleMagnitude(
+				gp.axes[0],
+				gp.axes[1],
+				deadzone,
+				null
+			);
+		}
+	};
+})();
+
+const handleEvent=(type, evt) => {
+	for(let handler of handlers) {
+		let fn=handler[type];
+		if(fn) fn(evt);
+	}
+};
+
+const enableHandler=handler => {
+	if(!handlers.includes(handler)) {
+		handlers.push(handler);
+		if(handler.init) handler.init();
+	}
+};
+const disableHandler=handler => {
+	let idx=handlers.indexOf(handler);
+	if(idx!=-1) {
+		handlers.splice(idx, 1);
+		if(handler.fini) handler.fini();
+	}
+};
+const linkHandler=(handler, key) => {
+	if(config.getB(key)) enableHandler(handler);
+	config.watchB(key, (k, v) => {
+		if(v) enableHandler(handler);
+		else disableHandler(handler);
+	});
+};
+
+const init=({hud: hudElem}) => {
+	hud=hudElem;
+	linkHandler(handleCrosspad, 'input.touchscreen.crosspad.enabled');
+	linkHandler(handleJoystick, 'input.touchscreen.joystick.enabled');
+	linkHandler(handleSwipe, 'input.touchscreen.swipe.enabled');
+	linkHandler(handleGamepads, 'input.gamepad.enabled');
+	linkHandler(handleKeyboard, 'input.keyboard.enabled');
+};
+
+const clear=() =>
+	Object
+		.keys(currentInputs)
+		.forEach(key => delete currentInputs[key]);
+
+for(let type of ['keydown', 'touchstart', 'touchmove']) {
+	window.addEventListener(type, handleEvent.bind(null, type));
+}
+
+return module.exports={
+	inputs: currentInputs,
+	clear,
+	framefn: handleEvent.bind(null, 'frame'),
+	init
+};

src/js/leaderboards.js

@@ -0,0 +1,109 @@
+const Popup=require('popup');
+const levels=require('levels');
+const config=require('config');
+
+const upload=async (mode, win, snek) => {
+	if(!win && !snek.rules.uploadOnDeath) return;
+	if(window.serverless) return;
+
+	const username=config.getS('player.name');
+	const score=snek.score;
+	const length=snek.length;
+	const time=snek.endPlayTime;
+	const speed=snek.speed;
+
+	const rst=await fetch('api/leaderboards/'+mode, {
+		method: 'POST',
+		headers: {
+			'Content-Type': 'application/json'
+		},
+		body: JSON.stringify({
+			username,
+			score, length,
+			time, speed
+		})
+	});
+	const dat=await rst.json();
+	if(!dat.ok) console.error(rst.err);
+};
+
+const show=async (mode='speedrun/1', page=1) => {
+	let popup=new Popup("Leaderboards: "+mode);
+
+	const [category, id]=mode.split('/');
+	let modes=[];
+	(() => {
+		Object.keys(window.levelList).forEach(cat => {
+			window.levelList[cat].levels.forEach(lvl => {
+				modes.push(cat+'/'+lvl);
+			});
+		});
+	})();
+	const prevMode=() => {
+		let idx=modes.indexOf(mode);
+		return modes[idx-1]||modes[modes.length-1];
+	};
+	const nextMode=() => {
+		let idx=modes.indexOf(mode);
+		return modes[idx+1]||modes[0];
+	};
+
+	const rules=await levels.getRules(category, id);
+	const sort=rules.leaderboardsSort;
+	const rst=await fetch('api/leaderboards/'+mode+'?sort='+sort+'&page='+page+'&results=10');
+	const {ok, data, err}=await rst.json();
+
+	popup.buttons.close="Close";
+	popup.buttons.modeP="Previous mode";
+	popup.buttons.modeN="Next mode";
+	popup.large=true;
+	popup.animation=false;
+
+	if(ok) {
+		popup.addStrong("Page "+page);
+		if(data.length==10) popup.buttons.next="Next page";
+		if(page>1) popup.buttons.prev="Previous page";
+
+		if(data.length==0) {
+			popup.addEm("No data");
+		} else {
+			const rpad=(n, digits=2, pad=' ') =>
+				((''+n).length>=digits)?(''+n):(rpad(pad+n, digits, pad));
+
+			popup.addTable(data.map(({username, score, length, speed, time}, i) => {
+				return {
+					rank: '#'+(i+(page-1)*10+1),
+					username,
+					score: score+'pts',
+					length,
+					speed: speed+'tps',
+					time: rpad(Math.floor(time/60000), 2, '0')+
+						':'+rpad(Math.floor(time/1000)%60, 2, '0')+
+						':'+rpad(time%1000, 3, '0')
+				};
+			}), [
+				'rank',
+				'username',
+				'score',
+				'length',
+				'speed',
+				'time'
+			]);
+		}
+	} else {
+		popup.addStrong("Error loading leaderboards");
+		popup.addEm(err);
+	}
+
+	Popup.dismiss();
+	const verb=await popup.display();
+	if(verb=='next') return show(mode, page+1);
+	else if(verb=='prev') return show(mode, page-1);
+	else if(verb=='modeP') return show(prevMode());
+	else if(verb=='modeN') return show(nextMode());
+	location.hash='';
+};
+
+return module.exports={
+	upload, show
+};

src/js/levels.js

@@ -0,0 +1,43 @@
+const cache=Object.create(null);
+
+const get=async filename => {
+	if(cache[filename]) return cache[filename];
+	const req=await fetch('levels/'+filename);
+	const json=await req.json();
+	return cache[filename]=json;
+};
+
+const getInfo=(category, id) => {
+	const cat=levelList[category];
+	id=''+id;
+
+	const displayName=cat.levelDisplay
+		.replace(/<n>/g, id)
+		.replace(/<l>/g, id.toLowerCase());
+	const fileName=cat.levelFilename
+		.replace(/<n>/g, id)
+		.replace(/<l>/g, id.toLowerCase());
+	const levelString=category+'/'+id+'/'+fileName;
+
+	return {
+		displayName,
+		fileName,
+		levelString
+	};
+};
+
+const getRules=async (category, id) => {
+	const {fileName}=getInfo(category, id);
+	const json=await get(fileName);
+	return Object.assign({}, window.levelList[category].rules, json.rules);
+};
+
+const clearCache=() =>
+	Object
+		.keys(cache)
+		.forEach(key => delete cache[key]);
+
+return module.exports={
+	get, getRules, getInfo,
+	clearCache
+};

src/js/main.js

@@ -0,0 +1,327 @@
+(async () => {
+
+	// load modules
+	const assets=require('assets');
+	const Popup=require('popup');
+	const SnekGame=require('snek');
+	const configEditor=require('configEditor');
+	const input=require('input');
+	const levels=require('levels');
+	const config=require('config');
+	const leaderboards=require('leaderboards');
+
+	// get a known state
+	await new Promise(ok => assets.onReady(ok));
+	location.hash='menu';
+
+	// get our DOM in check
+	const main=document.querySelector('main');
+	const nav=main.querySelector('nav');
+	const canvas=main.querySelector('canvas');
+	const hud=main.querySelector('#hud');
+
+	// load data from server
+	const levelList=window.levelList=assets.get('levelList');
+
+	// detect if we're running with a server
+	const serverless=window.serverless=await (async() => {
+		const res=await fetch('api/has-nodejs');
+		if(!res.ok) return true;
+		const msg=await res.json();
+		return msg!='yes';
+	})();
+	if(serverless) {
+		document.body.classList.add('serverless');
+	} else {
+		document.body.classList.add('server');
+	}
+
+	// flag the body as loaded
+	document.body.classList.remove('loading');
+
+	// get our global variables
+	let currentGame=null;
+
+	// forward-declare functions
+	let resizeCanvas, startGame, stopGame, handleWin, handleDeath, menu, help, settings, showLeaderboards, restart, updateHud;
+
+	// handle window resize and fullscreen
+	resizeCanvas=() => {
+		if(document.fullscreenElement) {
+			canvas.width=screen.width;
+			canvas.height=screen.height;
+		} else {
+			canvas.width=main.clientWidth;
+			canvas.height=main.clientHeight;
+		}
+	};
+	resizeCanvas();
+	window.addEventListener('resize', resizeCanvas);
+	window.addEventListener('keydown', async e => {
+		if(e.target.tagName.toLowerCase()=='input') return;
+		if(e.key=='f') {
+			if(document.fullscreenElement) await document.exitFullscreen();
+			else await main.requestFullscreen();
+			resizeCanvas();
+		}
+	});
+
+	// buid menu from level list
+	Object.keys(levelList).forEach(category => {
+		const cat=levelList[category];
+
+		const section=nav.appendChild(document.createElement('section'));
+		const h1=section.appendChild(document.createElement('h1'));
+		h1.innerText=category[0].toUpperCase()+category.slice(1)+" Mode";
+
+		const p=section.appendChild(document.createElement('p'));
+		p.innerText=cat.desc;
+
+		const ul=section.appendChild(document.createElement('ul'));
+		cat.levels.forEach((level, i) => {
+			const {displayName, fileName, levelString}=levels.getInfo(category, level);
+			const li=ul.appendChild(document.createElement('li'));
+			const a=li.appendChild(document.createElement('a'));
+			a.href='#'+levelString;
+			a.innerText=displayName;
+			if(cat.levelDesc) {
+				const span=li.appendChild(document.createElement('span'));
+				span.innerText=cat.levelDesc[i];
+			}
+		});
+	});
+
+	// stop a running game
+	stopGame=() => {
+		if(currentGame) {
+			// stop the actual game
+			currentGame.playing=false;
+
+			// setup the DOM
+			nav.classList.remove('hidden');
+			canvas.classList.add('hidden');
+			hud.classList.add('hidden');
+		}
+	};
+
+	// display the leaderboards
+	showLeaderboards=() => {
+		stopGame();
+		leaderboards.show();
+	};
+
+	// start a new game
+	startGame=async (category, levelId, filename) => {
+		// stop any running games and clear popups
+		stopGame();
+		Popup.dismiss();
+
+		// load rules and level from cache or server
+		const rules=levelList[category].rules || {};
+		const level=await levels.get(filename);
+
+		// stop any running games and clear popups again
+		stopGame();
+		Popup.dismiss();
+
+		// create the game and attach the callbacks and config
+		const snek=currentGame=new SnekGame(level, canvas, rules);
+		snek.callback=evt => {
+			if(evt=='tick') {
+				input.framefn();
+				snek.handleInputs(input.inputs);
+				updateHud();
+			} else if(evt=='win') {
+				handleWin(snek);
+			} else if(evt=='die') {
+				handleDeath(snek);
+			}
+		};
+
+		// setup the DOM
+		nav.classList.add('hidden');
+		canvas.classList.remove('hidden');
+		hud.classList.remove('hidden');
+
+		// push some userdata to the snake
+		snek.userdata={
+			category,
+			levelId,
+			filename
+		};
+
+		// reset the inputs
+		input.clear();
+
+		// start the actual game
+		snek.start();
+	};
+
+	// return to the menu
+	menu=() => {
+		stopGame();
+		Popup.dismiss();
+	};
+
+	// show config editor
+	settings=async () => {
+		stopGame();
+		Popup.dismiss();
+		await configEditor.show();
+		location.hash='menu';
+	};
+
+	// show help page
+	help=async () => {
+		stopGame();
+		Popup.dismiss();
+		let iframe=document.createElement('iframe');
+		iframe.src='help.html';
+		iframe.style.width='100%';
+		iframe.style.height='100%';
+		await new Popup(
+			"Help",
+			[iframe],
+			{ok: "OK"},
+			true
+		).display();
+		location.hash='menu';
+	};
+
+	// display the win popup
+	handleWin=async snek => {
+		// hide the HUD
+		hud.classList.add('hidden');
+
+		// fetch userdata from the game
+		const {category, levelId, filename}=snek.userdata;
+
+		// upload scores
+		if(config.getB('player.leaderboards')) leaderboards.upload(category+'/'+levelId, true, snek);
+
+		// create and configure popup
+		let popup=new Popup("Finished!");
+		popup.addStrong("You won!");
+		popup.addContent({
+			"Time": snek.endPlayTime/1000+'s',
+			"Score": snek.score,
+			"Final length": snek.length,
+			"Final speed": snek.speed+'tps'
+		});
+		popup.buttons={
+			retry: "Retry",
+			menu: "Main menu"
+		};
+		if(levelList[category].nextLevel) {
+			let nextId=(+levelId)+1;
+			if(levelList[category].levels.includes(nextId)) popup.buttons.next="Next level";
+		}
+
+		// show the actual popup
+		let result=await popup.display(main);
+
+		// act on it
+		if(result=='retry') {
+			startGame(category, levelId, filename);
+		} else if(result=='menu') {
+			location.hash='menu';
+		} else if(result=='next') {
+			const {category, levelId}=snek.userdata;
+			let nextId=(+levelId)+1;
+			let {levelString}=levels.getInfo(category, nextId)
+			location.hash=levelString;
+		}
+	};
+
+	// display the death popup
+	handleDeath=async snek => {
+		// hide the HUD
+		hud.classList.add('hidden');
+
+		// fetch userdata from the game
+		const {category, levelId, filename}=snek.userdata;
+
+		// upload scores
+		if(config.getB('player.leaderboards')) leaderboards.upload(category+'/'+levelId, false, snek);
+
+		// create and configure popup
+		let popup=new Popup("Finished!");
+		popup.addStrong(config.getS('player.name')+' '+snek.death.message);
+		popup.addEm('('+config.getS('player.name')+' '+snek.death.reason+')');
+		popup.addContent({
+			"Time": snek.endPlayTime/1000+'s',
+			"Score": snek.score,
+			"Final length": snek.length,
+			"Final speed": snek.speed+'tps'
+		});
+		popup.buttons={
+			retry: "Retry",
+			menu: "Main menu"
+		};
+
+		// show the actual popup
+		let result=await popup.display(main);
+
+		// act on it
+		if(result=='retry') {
+			startGame(category, levelId, filename);
+		} else if(result=='menu') {
+			location.hash='menu';
+		}
+	};
+
+	// draw status hud
+	updateHud=() => {
+		// stay safe
+		if(!currentGame) return;
+
+		// get the actual elements
+		const speedDisplay=document.querySelector('#hud .speed');
+		const scoreDisplay=document.querySelector('#hud .score');
+		const timeDisplay=document.querySelector('#hud .time');
+
+		// rpad is useful
+		const rpad=(n, digits=2, pad=' ') =>
+			((''+n).length>=digits)?(''+n):(rpad(pad+n, digits, pad));
+
+		// actually do the hud
+		speedDisplay.innerText=rpad(currentGame.speed, 2, '0')+'tps';
+		scoreDisplay.innerText=currentGame.score;
+		timeDisplay.innerText=rpad(Math.floor(currentGame.playTime/60000), 2, '0')+
+			':'+rpad(Math.floor(currentGame.playTime/1000)%60, 2, '0')+
+			':'+rpad(currentGame.playTime%1000, 3, '0');
+	};
+
+	// quick restart
+	restart=() => {
+		if(currentGame && currentGame.playing) {
+			const {category, levelId, filename}=currentGame.userdata;
+			startGame(category, levelId, filename);
+		}
+	}
+	window.addEventListener('keydown', e => {
+		if(e.key=='r') restart();
+	});
+	(() => {
+		let restartbtn=hud.appendChild(document.createElement('span'));
+		restartbtn.classList.add('restart');
+		restartbtn.addEventListener('click', restart);
+		restartbtn.addEventListener('touchend', restart);
+	})();
+
+	// handle page navigation
+	window.addEventListener('hashchange', () => {
+		const hash=location.hash.substr(1);
+
+		if(hash=='' || hash=='menu') return menu();
+		else if(hash=='help') return help();
+		else if(hash=='settings') return settings();
+		else if(hash=='leaderboards') return showLeaderboards();
+
+		const [_, category, levelId, filename]=location.hash.match(/([a-zA-Z0-9_-]+?)\/([a-zA-Z0-9_-]+?)\/(.+)/);
+		startGame(category, levelId, filename);
+	});
+
+	// enable input methods overlay
+	input.init({hud});
+})();

src/js/popup.js

@@ -0,0 +1,128 @@
+const objToDom=obj => {
+	if(obj instanceof Node) {
+		return obj;
+	} else if(obj[Popup.EM]) {
+		let em=document.createElement('em');
+		em.appendChild(document.createTextNode(obj[Popup.EM]));
+		return em;
+	} else if(obj[Popup.STRONG]) {
+		let em=document.createElement('strong');
+		em.appendChild(document.createTextNode(obj[Popup.STRONG]));
+		return em;
+	} else if(typeof obj=='string' || typeof obj=='number') {
+		return document.createTextNode(obj+'');
+	} else if(Array.isArray(obj)) {
+		let ul=document.createElement('ul');
+		obj.forEach(elem => ul.appendChild(objToDom(elem)));
+		return ul;
+	} else {
+		let table=document.createElement('table');
+		table.classList.add('dual');
+		Object
+			.keys(obj)
+			.forEach(key => {
+				let tr=table.appendChild(document.createElement('tr'));
+				tr.appendChild(document.createElement('th')).appendChild(document.createTextNode(key));
+				tr.appendChild(document.createElement('td')).appendChild(objToDom(obj[key]));
+			});
+		return table;
+	}
+}
+
+class Popup {
+	constructor(title, content=[], buttons={}, large=false) {
+		this.title=title;
+		this.content=content.map(objToDom);
+		this.buttons={...buttons};
+		this.large=large;
+		this.animation=true;
+	}
+
+	addContent(cnt) {
+		this.content.push(objToDom(cnt));
+	}
+	addText(cnt) {
+		this.content.push(document.createTextNode(cnt));
+	}
+	addEm(cnt) {
+		this.content.push(objToDom({[Popup.EM]: cnt}));
+	}
+	addStrong(cnt) {
+		this.content.push(objToDom({[Popup.STRONG]: cnt}));
+	}
+	addHeading(cnt, level=2) {
+		let hn=document.createElement('h'+level);
+		hn.innerText=cnt;
+		this.content.push(hn);
+	}
+	addTable(data, heading=Object.keys(data)) {
+		let table=document.createElement('table');
+		table.classList.add('table');
+		let thead=table.appendChild(document.createElement('thead'));
+		let headingRow=thead.appendChild(document.createElement('tr'));
+		heading.forEach(key => {
+			let th=headingRow.appendChild(document.createElement('th'));
+			th.innerText=key;
+		});
+		let tbody=table.appendChild(document.createElement('tbody'));
+		data.forEach(row => {
+			let tr=tbody.appendChild(document.createElement('tr'));
+			heading.forEach(key => {
+				let td=tr.appendChild(document.createElement('td'));
+				td.innerText=row[key];
+			});
+		});
+		this.content.push(table);
+	}
+
+	async display(parent=document.body) {
+		let outer=document.createElement('div');
+		outer.classList.add('popup');
+		let popup=outer.appendChild(document.createElement('div'));
+		popup.classList.add('content');
+		if(this.large) popup.classList.add('large');
+		if(this.animation) outer.classList.add('animation');
+
+		let title=popup.appendChild(document.createElement('h1'));
+		title.innerText=this.title;
+
+		let contentSection=popup.appendChild(document.createElement('section'));
+		this.content.forEach(elem => contentSection.appendChild(elem));
+
+		let buttonSection=popup.appendChild(document.createElement('section'));
+		let buttons=Object.keys(this.buttons).map(btn => {
+			let button=document.createElement('button');
+			button.innerText=this.buttons[btn];
+			button.dataset.code=btn;
+			return button;
+		});
+		buttons.forEach(btn => buttonSection.appendChild(btn));
+
+		parent.appendChild(outer);
+		Popup.displayed.push(this);
+
+		const btnActions=buttons.map(btn => new Promise(ok => {
+			btn.addEventListener('click', e => {
+				e.preventDefault();
+				return ok(btn.dataset.code);
+			});
+		}));
+		const dismissAction=new Promise(ok => this.dismiss=ok);
+
+		const code=await Promise.race(btnActions.concat([dismissAction]));
+
+		parent.removeChild(outer);
+		Popup.displayed.splice(Popup.displayed.indexOf(this), 1);
+		return code;
+	}
+}
+
+Popup.EM=Symbol('EM');
+Popup.STRONG=Symbol('STRONG');
+
+Popup.displayed=[];
+Popup.dismiss=arg => {
+	Popup.displayed.forEach(p => p.dismiss(arg));
+};
+
+return module.exports=Popup;

src/js/progress.js

@@ -0,0 +1,44 @@
+class ProgressBar {
+	constructor(taskCount) {
+		this.taskCount=taskCount;
+		this.completeCount=0;
+		this.updateListeneres=[];
+	}
+
+	get percent() {
+		return Math.floor(this.completeCount/this.taskCount*100);
+	}
+
+	get ready() {
+		return this.completeCount==this.taskCount;
+	}
+
+	addUpdateListener(fn) {
+		this.updateListeneres.push(fn.bind(this));
+	}
+	addReadyListener(fn) {
+		this.updateListeneres.push(() => {
+			if(this.ready) fn.bind(this)();
+		});
+	}
+
+	update() {
+		this.completeCount++;
+		this.updateListeneres.forEach(l => l(this));
+	}
+
+	draw(canvas, bgColor='red', textColor='black') {
+		let ctx=canvas.getContext('2d');
+		ctx.clearRect(0, 0, canvas.width, canvas.height);
+		ctx.fillStyle=bgColor;
+		ctx.fillRect(0, 0, canvas.width*this.completeCount/this.taskCount, canvas.height);
+		ctx.fillStyle=textColor;
+		ctx.textAlign='center';
+		ctx.textBaseline='middle';
+		ctx.font=`${canvas.height/2}px 'Fira Code'`;
+		ctx.fillText(this.percent+'%', canvas.width/2, canvas.height/2);
+	}
+}
+
+return ProgressBar;
+

src/js/renderer.js

@@ -0,0 +1,329 @@
+const assets=require('assets');
+const config=require('config');
+const {tiles: T}=require('tiles');
+
+// declare our tiles
+let snake,
+	wall, hole,
+	fire, flammable,
+	fruit, superFruit, decayFruit,
+	portalA, portalB, portalC, portalD,
+	key, door,
+	switchTile, spikes;
+
+// load our tiles
+assets.onReady(() => {
+	wall=assets.get('wall');
+	hole=assets.get('hole');
+	fire=assets.get('fire');
+	flammable=assets.get('flammable');
+	superFruit=assets.get('superFruit');
+	decayFruit=assets.get('decayFruit');
+	portalA=assets.get('portalA');
+	portalB=assets.get('portalB');
+	portalC=assets.get('portalC');
+	portalD=assets.get('portalD');
+	key=assets.get('key');
+	door=assets.get('door');
+	switchTile=assets.get('switch');
+	spikes=assets.get('spikes');
+	snake=assets.get('snake');
+	fruit=assets.get('fruit');
+});
+
+const draw=(game, canvas=game.canvas, ctx=canvas.getContext('2d')) => {
+	// clear the canvas, because it's easier than having to deal with everything
+	ctx.clearRect(0, 0, canvas.width, canvas.height);
+
+	// get the cell size and offset
+	const cellSize=Math.min(
+		canvas.width/game.dimensions[0],
+		canvas.height/game.dimensions[1]
+	);
+	const offsetX=(canvas.width-cellSize*game.dimensions[0])/2;
+	const offsetY=(canvas.height-cellSize*game.dimensions[1])/2;
+
+	// tile draw functions
+	const putTile=(x, y, tile) => ctx.drawImage(
+		tile,
+		offsetX+cellSize*x,
+		offsetY+cellSize*y,
+		cellSize,
+		cellSize
+	);
+	const putTileAnim=(x, y, tile) => putTile(x, y, tile[
+		Math.floor(Date.now()/1000*60+x+y)%tile.length
+	]);
+	const putTileAnimPercent=(x, y, tile, percent) => putTile(x, y, tile[
+		Math.min(Math.round(percent*tile.length), tile.length-1)
+	]);
+
+	// adjascence check
+	const checkAdj=(x, y) => {
+		let adj={};
+		adj.u=game.world[x][y-1];
+		adj.d=game.world[x][y+1];
+		adj.l=(game.world[x-1] || [])[y];
+		adj.r=(game.world[x+1] || [])[y];
+		adj.ul=(game.world[x-1] || [])[y-1];
+		adj.ur=(game.world[x+1] || [])[y-1];
+		adj.dl=(game.world[x-1] || [])[y+1];
+		adj.dr=(game.world[x+1] || [])[y+1];
+		return adj;
+	};
+
+	// draw a grid/checkerboard if requested
+	if(config.getS('appearance.grid')=='grid') {
+		ctx.strokeStyle='rgba(0, 0, 0, 50%)';
+		ctx.lineCap='square';
+		ctx.lineWidth=1;
+		ctx.beginPath();
+		for(let x=1; x<game.dimensions[0]; x++) {
+			ctx.moveTo(offsetX+x*cellSize, offsetY);
+			ctx.lineTo(offsetX+x*cellSize, canvas.height-offsetY);
+		}
+		for(let y=1; y<game.dimensions[1]; y++) {
+			ctx.moveTo(offsetX, offsetY+y*cellSize);
+			ctx.lineTo(canvas.width-offsetX, offsetY+y*cellSize);
+		}
+		ctx.stroke();
+	} else if(config.getS('appearance.grid')=='checkerboard') {
+		ctx.fillStyle='rgba(0, 0, 0, 10%)';
+		for(let x=0; x<game.dimensions[0]; x++) {
+			for(let y=(x+1)%2; y<game.dimensions[1]; y+=2) {
+				ctx.fillRect(offsetX+x*cellSize, offsetY+y*cellSize, cellSize, cellSize);
+			}
+		}
+	}
+
+	// draw our tiles
+	for(let x=0; x<game.dimensions[0]; x++) {
+		for(let y=0; y<game.dimensions[1]; y++) {
+			switch(game.world[x][y]) {
+				case T.WALL:
+					putTile(x, y, wall);
+					break;
+
+				case T.FIRE:
+					putTileAnim(x, y, fire);
+					break;
+
+				case T.HOLE:
+				case T.HOLE_S: {
+					putTile(x, y, hole.base);
+					let adj=checkAdj(x, y);
+					Object
+						.keys(adj)
+						.filter(k => adj[k]==T.HOLE || adj[k]==T.HOLE_S)
+						.forEach(k => putTile(x, y, hole[k]));
+				} break;
+
+				case T.FLAMMABLE:
+				case T.FLAMMABLE_S:
+					putTile(x, y, flammable);
+					break;
+
+				case T.SUPER_FOOD:
+					putTileAnim(x, y, superFruit);
+					break;
+
+				case T.PORTAL_A:
+				case T.PORTAL_A_S:
+					putTileAnim(x, y, portalA);
+					break;
+				case T.PORTAL_B:
+				case T.PORTAL_B_S:
+					putTileAnim(x, y, portalB);
+					break;
+				case T.PORTAL_C:
+				case T.PORTAL_C_S:
+					putTileAnim(x, y, portalC);
+					break;
+				case T.PORTAL_D:
+				case T.PORTAL_D_S:
+					putTileAnim(x, y, portalD);
+					break;
+
+				case T.KEY:
+					putTile(x, y, key);
+					break;
+				case T.DOOR:
+					putTile(x, y, door);
+					break;
+
+				case T.SWITCH_ON:
+				case T.SWITCH_ON_S:
+					putTile(x, y, switchTile.on);
+					break;
+				case T.SWITCH_OFF:
+				case T.SWITCH_OFF_S:
+					putTile(x, y, switchTile.off);
+					break;
+
+				case T.SPIKES_ON:
+					putTile(x, y, spikes.on);
+					break;
+				case T.SPIKES_OFF:
+				case T.SPIKES_OFF_S:
+					putTile(x, y, spikes.off);
+					break;
+			}
+		}
+	}
+
+	// draw our decaying fruits (they have more information than just XY, so they need to be drawn here
+	game.decayFood.forEach(([x, y, birth]) =>
+		putTileAnimPercent(x, y, decayFruit, (game.playTime-birth)/2000)
+	);
+
+	// draw the lines between portals
+	if(Object.keys(game.portals).length) {
+		ctx.strokeStyle='rgba(128, 128, 128, 20%)';
+		ctx.lineCap='round';
+		ctx.lineWidth=cellSize*.15;
+		const drawTunnel=([xa, ya], [xb, yb]) => {
+			const angle=(Math.floor(Date.now()/10)%360)*(Math.PI/180);
+			for(let i=0; i<=1; i++) {
+				const dx=cellSize/3*Math.cos(angle+i*Math.PI);
+				const dy=cellSize/3*Math.sin(angle+i*Math.PI);
+				ctx.beginPath();
+				ctx.moveTo(
+					offsetX+cellSize*(xa+1/2)+dx,
+					offsetY+cellSize*(ya+1/2)+dy
+				);
+				ctx.lineTo(
+					offsetX+cellSize*(xb+1/2)+dx,
+					offsetY+cellSize*(yb+1/2)+dy
+				);
+				ctx.stroke();
+			}
+		};
+		if(game.portals.a && game.portals.b) drawTunnel(game.portals.a, game.portals.b);
+		if(game.portals.c && game.portals.d) drawTunnel(game.portals.c, game.portals.d);
+	}
+
+	// draw our snake (it gets drawn completely differently, so here it goes)
+	{
+		ctx.fillStyle=snake.color;
+		ctx.strokeStyle=snake.color;
+		ctx.lineCap=snake.cap;
+		ctx.lineJoin=snake.join;
+		ctx.lineWidth=cellSize*snake.tailSize;
+
+		ctx.beginPath();
+		ctx.ellipse(
+			offsetX+cellSize*(game.snake[0][0]+1/2),
+			offsetY+cellSize*(game.snake[0][1]+1/2),
+			cellSize/2*snake.headSize,
+			cellSize/2*snake.headSize,
+			0,
+			0,
+			Math.PI*2
+		);
+		ctx.fill();
+
+		ctx.beginPath();
+		game.snake.forEach(([x, y], i, a) => {
+			ctx.lineTo(
+				offsetX+cellSize*(x+1/2),
+				offsetY+cellSize*(y+1/2)
+			);
+			if(i!=0 && Math.hypot(x-a[i-1][0], y-a[i-1][1])>1) {
+				ctx.lineWidth=cellSize*snake.tailWrapSize;
+			} else {
+				ctx.lineWidth=cellSize*snake.tailSize;
+			}
+			ctx.stroke();
+			ctx.beginPath()
+			ctx.moveTo(
+				offsetX+cellSize*(x+1/2),
+				offsetY+cellSize*(y+1/2)
+			);
+		});
+		ctx.stroke();
+	}
+
+	// our fruit has a nice animation to it between .8 and 1.2 scale
+	{
+		const ms=Date.now();
+		const fruitScale=Math.sin(ms/400*Math.PI)*.2+1
+		game.fruits.forEach(([x, y]) => {
+			ctx.drawImage(
+				fruit,
+				offsetX+cellSize*x+(1-fruitScale)*cellSize/2,
+				offsetY+cellSize*y+(1-fruitScale)*cellSize/2,
+				cellSize*fruitScale,
+				cellSize*fruitScale
+			);
+		});
+	}
+
+	// show the timer
+	if(game.rules.winCondition=='time') {
+		if(config.getS('appearance.timer')=='border' || config.getS('appearance.timer')=='both') {
+			let remaining=(game.rules.gameDuration-game.playTime)/game.rules.gameDuration;
+			const w=game.dimensions[0]*cellSize;
+			const h=game.dimensions[1]*cellSize;
+			const p=w*2+h*2;
+
+			const wp=w/p;
+			const hp=h/p;
+
+			const pdst=(st, ed, frac) =>
+				(ed-st)*frac+st;
+
+			ctx.strokeStyle='#930a16';
+			ctx.lineJoin='miter';
+			ctx.lineCap='round';
+			ctx.lineWidth=5;
+			ctx.beginPath();
+			ctx.moveTo(canvas.width/2, offsetY+2);
+
+			let sp=Math.min(wp/2, remaining);
+			remaining-=sp;
+			ctx.lineTo(pdst(canvas.width/2, w+offsetX-2, sp/wp*2), offsetY+2);
+			if(remaining) {
+				sp=Math.min(hp, remaining);
+				remaining-=sp;
+				ctx.lineTo(w+offsetX-2, pdst(offsetY+2, offsetY+h-2, sp/hp));
+			}
+			if(remaining) {
+				sp=Math.min(wp, remaining);
+				remaining-=sp;
+				ctx.lineTo(pdst(w+offsetX-2, offsetX+2, sp/wp), offsetY+h-2);
+			}
+			if(remaining) {
+				sp=Math.min(hp, remaining);
+				remaining-=sp;
+				ctx.lineTo(offsetX+2, pdst(offsetY+h-2, offsetY+2, sp/hp));
+			}
+			if(remaining) {
+				ctx.lineTo(pdst(offsetX+2, canvas.width/2, remaining/wp*2), offsetY+2);
+			}
+			ctx.stroke();
+		}
+		if(config.getS('appearance.timer')=='number' || config.getS('appearance.timer')=='both') {
+			let remaining=''+Math.ceil((game.rules.gameDuration-game.playTime)/1000);
+			while(remaining.length<(''+game.rules.gameDuration/1000).length) remaining='0'+remaining;
+
+			ctx.fillStyle='#930a16';
+			ctx.textAlign='center';
+			ctx.textBaseline='middle';
+			ctx.font='4rem "Fira Code"';
+			ctx.fillText(remaining, canvas.width/2, canvas.height/2);
+		}
+	}
+
+	// draw the border around our game area
+	{
+		ctx.fillStyle='black';
+		ctx.fillRect(0, 0, canvas.width, offsetY);
+		ctx.fillRect(0, 0, offsetX, canvas.height);
+		ctx.fillRect(offsetX+cellSize*game.dimensions[0], 0, offsetX, canvas.height);
+		ctx.fillRect(0, offsetY+cellSize*game.dimensions[1], canvas.width, offsetY);
+	}
+};
+
+return module.exports={
+	draw
+};

src/js/snek.js

@@ -0,0 +1,479 @@
+const {
+	tiles: T,
+	forChar,
+	getType,
+	isPortal,
+	snakeVersion, nonSnakeVersion
+}=require('tiles');
+
+class SnekGame {
+	constructor(settings, canvas, rules) {
+		// setup the delay
+		this.delay=settings.delay || Infinity;
+
+		// score starts at 0
+		this.score=0;
+
+		// world is given in the level
+		if(settings.world) { // explicitly
+
+			// convert the world
+			this.world=Array(settings.world[0].length);
+			for(let x=0; x<this.world.length; x++) {
+				this.world[x]=Array(settings.world.length);
+				for(let y=0; y<this.world[x].length; y++) {
+					this.world[x][y]=forChar(settings.world[y][x]);
+				}
+			}
+
+			// extract the dimensions
+			this.dimensions=[this.world.length, this.world[0].length];
+
+			// extract the fruits
+			this.fruits=this.getTilesOfType(T.FOOD);
+
+			// extract the decaying fruits
+			this.decayFood=this.getTilesOfType(T.DECAY_FOOD);
+
+			// extract the portals
+			this.portals={};
+			this.world.forEach((l, x) =>
+				l.forEach((c, y) => {
+					if(c==T.PORTAL_A) this.portals.a=[x, y];
+					if(c==T.PORTAL_B) this.portals.b=[x, y];
+					if(c==T.PORTAL_C) this.portals.c=[x, y];
+					if(c==T.PORTAL_D) this.portals.d=[x, y];
+				})
+			);
+		} else { // dimension and objects
+
+			// get the dimensions
+			this.dimensions=[...settings.dimensions];
+
+			// build an empty world
+			this.world=Array(settings.dimensions[0]);
+			for(let i=0; i<settings.dimensions[0]; i++) {
+				this.world[i]=Array(settings.dimensions[1]);
+				this.world[i].fill(T.EMPTY);
+			}
+
+			// add the walls
+			if(settings.walls) settings.walls.forEach(([x, y]) => this.world[x][y]=T.WALL);
+
+			// add the holes
+			if(settings.holes) settings.holes.forEach(([x, y]) => this.world[x][y]=T.HOLE);
+
+			// add the fires and flammable tiles
+			if(settings.fires) settings.fires.forEach(([x, y]) => this.world[x][y]=T.FIRE);
+			if(settings.flammable) settings.flammable.forEach(([x, y]) => this.world[x][y]=T.FLAMMABLE);
+
+			// add the food
+			settings.food.forEach(([x, y]) => this.world[x][y]=T.FOOD);
+			this.fruits=[...settings.food];
+
+			// add the super food
+			if(settings.superFood) settings.superFood.forEach(([x, y]) => this.world[x][y]=T.SUPER_FOOD);
+
+			// add the decaying food
+			if(settings.decayFood) {
+				settings.decayFood.forEach(([x, y]) => this.world[x][y]=T.DECAY_FOOD);
+				this.decayFood=settings.decayFood.map(([x, y]) => [x, y, 0]);
+			} else {
+				this.decayFood=[];
+			}
+
+			// add the portals
+			if(settings.portals) {
+				if(settings.portals.a) this.world[settings.portals.a[0]][settings.portals.a[1]]=T.PORTAL_A;
+				if(settings.portals.b) this.world[settings.portals.b[0]][settings.portals.b[1]]=T.PORTAL_B;
+				if(settings.portals.c) this.world[settings.portals.c[0]][settings.portals.c[1]]=T.PORTAL_C;
+				if(settings.portals.d) this.world[settings.portals.d[0]][settings.portals.d[1]]=T.PORTAL_D;
+				this.portals={...settings.portals};
+			} else {
+				this.portals={};
+			}
+
+			// add the keys
+			if(settings.keys) settings.keys.forEach(([x, y]) => this.world[x][y]=T.KEY);
+
+			// add the doors
+			if(settings.doors) settings.doors.forEach(([x, y]) => this.world[x][y]=T.DOOR);
+
+			// add the switches
+			if(settings.switches) settings.switches.forEach(([x, y]) => this.world[x][y]=T.SWITCH_OFF);
+
+			// add the spikes
+			if(settings.spikesOn) settings.spikesOn.forEach(([x, y]) => this.world[x][y]=T.SPIKES_ON);
+			if(settings.spikesOff) settings.spikesOff.forEach(([x, y]) => this.world[x][y]=T.SPIKES_OFF);
+		}
+
+		// add the snake to the world
+		settings.snake.forEach(([x, y]) => this.world[x][y]=T.SNAKE);
+
+
+		// get the head and initial direction
+		this.head=[...settings.snake[0]];
+		if(settings.snake.length>=2) this.direction=[
+			settings.snake[0][0]-settings.snake[1][0],
+			settings.snake[0][1]-settings.snake[1][1]
+		];
+		else this.direction=[
+			1,
+			0
+		];
+		this.lastDirection=this.direction
+
+		// store the snake
+		this.snake=[...settings.snake];
+		this.length=this.snake.length;
+
+		// get our canvas, like, if we want to actually draw
+		this.canvas=canvas;
+		this.ctx=canvas.getContext('2d');
+
+		// load the custom rules
+		this.rules=Object.assign({
+			fruitRegrow: true,
+			superFruitGrow: false,
+			decayingFruitGrow: false,
+			speedIncrease: true,
+			worldWrap: true,
+			winCondition: 'none',
+			scoreSystem: 'fruit',
+			fireTickSpeed: 10,
+			autoSizeGrow: false,
+			autoSpeedIncrease: false,
+			timeFlow: true
+		}, rules, settings.rules || {});
+
+		// reset direction if time doesn't flow
+		if(!this.rules.timeFlow) {
+			this.lastDirection=[0, 0];
+			this.direction=[0, 0];
+		}
+
+		// set score if move-based
+		if(this.rules.scoreSystem=='moves') {
+			this.score=this.rules.moveCount;
+		}
+	}
+
+	get playTime() {
+		return Date.now()-this.firstStep;
+	}
+
+	get speed() {
+		return Math.round(1000/this.delay);
+	}
+
+	getTile(x, y) {
+		return (this.world[x]||[])[y];
+	}
+	getTileA([x, y]) {
+		return (this.world[x]||[])[y];
+	}
+	putTile(x, y, t) {
+		this.world[x][y]=t;
+	}
+	putTileA([x, y], t) {
+		this.world[x][y]=t;
+	}
+
+	getTilesOfType(type) {
+		return this
+			.world
+			.map(
+				(l, x) => l
+					.map(
+						(r, y) => r==type?[x,y]:null
+					).filter(
+						a => a
+					)
+			).flat();
+	}
+	replaceTilesOfType(type, newType) {
+		this.world.forEach(l =>
+			l.forEach((t, i) => {
+				if(t==type) l[i]=newType;
+			})
+		);
+	}
+
+	draw() {
+		require('renderer').draw(this, this.canvas, this.ctx);
+	}
+
+	step() {
+		this.tickId++;
+		this.lastDirection=this.direction;
+
+		// compute our new head
+		let head;
+		if(!this.portaled && isPortal(this.getTileA(this.snake[0]))) {
+			const tile=this.getTileA(this.snake[0]);
+			if(tile==T.PORTAL_A_S) head=this.portals.b;
+			if(tile==T.PORTAL_B_S) head=this.portals.a;
+			if(tile==T.PORTAL_C_S) head=this.portals.d;
+			if(tile==T.PORTAL_D_S) head=this.portals.c;
+			this.portaled=true;
+		} else {
+			head=[
+				this.snake[0][0]+this.direction[0],
+				this.snake[0][1]+this.direction[1]
+			];
+			this.portaled=false;
+		}
+
+		// get our tail out of the way
+		const tail=this.snake.pop();
+		this.putTileA(tail, nonSnakeVersion(this.getTileA(tail)));
+
+		// check for out of world conditions
+		if(head[0]<0 || head[0]>=this.dimensions[0] || head[1]<0 || head[1]>=this.dimensions[1]) {
+			if(this.rules.worldWrap) {
+				head[0]=(head[0]+this.dimensions[0])%this.dimensions[0];
+				head[1]=(head[1]+this.dimensions[1])%this.dimensions[1];
+			} else {
+				return this.die("literally fell out of the world", "exited the grid");
+			}
+		}
+
+		let tile=this.getTileA(head);
+		switch(getType(tile)) {
+			// you hit, you die
+			case 'wall':
+				switch(tile) {
+					case T.WALL: return this.die("thought walls were edible", "hit a wall");
+					case T.FIRE: return this.die("burned to a crisp", "hit fire");
+					case T.DOOR: return this.die("forgot to OPEN the door", "hit a door");
+					case T.SPIKES_ON: return this.die("thought they were a girl's drink in a nightclub", "hit spikes");
+				}
+
+			// congratilations, you played yourself!
+			case 'snake':
+				return this.die("achieved every dog's dream", "ate their own tail");
+
+			// if either 3 consecutive segments or the whole snake is on a hole, you die
+			case 'hole':
+				if(
+					this.snake.length==0 ||
+					this.snake.length==1 &&
+						this.getTileA(this.snake[0])==T.HOLE_S ||
+					this.snake.length>=2 &&
+						this.getTileA(this.snake[0])==T.HOLE_S &&
+						this.getTileA(this.snake[1])==T.HOLE_S
+				) return this.die("fell harder than their grades", "fell in a hole");
+				break;
+
+			// you eat, you get a massive score boost
+			case 'bonus':
+				this.putTileA(head, T.EMPTY);
+				switch(tile) {
+					case T.SUPER_FOOD:
+						this.score+=10;
+
+					// you eat, you get a small score boost
+					case T.DECAY_FOOD:
+						this.score+=5;
+						this.decayFood=this.decayFood.filter(
+							([x, y, _]) => !(x==head[0] && y==head[1])
+						);
+				} break;
+
+			// you eat, you destroy all doors
+			case 'key':
+				this.putTileA(head, T.EMPTY);
+				this.replaceTilesOfType(T.DOOR, T.EMPTY);
+				break;
+
+			// you step on, you trigger
+			case 'switch': {
+				this.putTileA(head, tile==T.SWITCH_ON?T.SWITCH_OFF:T.SWITCH_ON);
+				if(this.getTilesOfType(T.SPIKES_OFF_S).length) return this.die("spiked themselves", "activated spikes");
+				const oldSpikes=this.getTilesOfType(T.SPIKES_ON);
+				this.replaceTilesOfType(T.SPIKES_OFF, T.SPIKES_ON);
+				oldSpikes.forEach(pos => this.putTileA(pos, T.SPIKES_OFF));
+			} break;
+
+			// you eat, you grow
+			case 'food':
+				// re-grow the snake
+				this.snake.push(tail);
+				this.putTileA(tail, snakeVersion(this.getTileA(tail)));
+				this.length++;
+
+				// remove the fruit from existence
+				this.putTileA(head, T.EMPTY);
+				this.fruits=this.fruits.filter(
+					([x, y]) => !(x==head[0] && y==head[1])
+				);
+
+				// increase score
+				this.score++;
+
+				// custom rules
+				if(this.rules.fruitRegrow) {
+					const emptyCells=this.getTilesOfType(T.EMPTY);
+
+					const cell=emptyCells[Math.floor(Math.random()*emptyCells.length)];
+					this.fruits.push(cell);
+					this.putTileA(cell, T.FOOD);
+				}
+
+				if(this.rules.superFruitGrow) {
+					if(Math.random()<.1) { // 10% chance
+						const emptyCells=this.getTilesOfType(T.EMPTY);
+						const cell=emptyCells[Math.floor(Math.random()*emptyCells.length)];
+						this.putTileA(cell, T.SUPER_FOOD);
+					}
+				}
+
+				if(this.rules.decayingFruitGrow) {
+					if(Math.random()<.2) { // 20% chance
+						const emptyCells=this.getTilesOfType(T.EMPTY);
+						const cell=emptyCells[Math.floor(Math.random()*emptyCells.length)];
+						this.putTileA(cell, T.DECAY_FOOD);
+						this.decayFood.push([cell[0], cell[1], this.playTime]);
+					}
+				}
+
+				if(this.rules.speedIncrease) {
+					this.delay*=this.rules.speedMultiplier;
+					if(this.delay<this.rules.speedCap) this.delay=this.rules.speedCap;
+				}
+		}
+
+		// move our head forward
+		tile=this.getTileA(head);
+		this.putTileA(head, snakeVersion(tile));
+		this.snake.unshift(head);
+
+		// decay decaying food
+		this.decayFood.forEach(
+			([x, y, birth]) => {
+				if(this.playTime>=birth+2000) this.putTile(x, y, T.EMPTY);
+			}
+		);
+		this.decayFood=this.decayFood.filter(
+			([_, __, birth]) => this.playTime<birth+2000
+		);
+
+		// automatic speed increase
+		if(this.rules.autoSpeedIncrease) {
+			if(this.delay>50 && this.tickId%this.rules.autoSpeadIncreaseTicks==0) this.delay--;
+		}
+
+		// automatic size grow
+		if(this.rules.autoSizeGrow) {
+			if(this.tickId%this.rules.autoSizeGrowTicks==0) this.snake.push(tail);
+		}
+
+		// fire tick
+		if(this.tickId%this.rules.fireTickSpeed==0) {
+			const touchingFire=([x, y]) => {
+				const surrounding=[
+					this.getTile(x, y-1),
+					this.getTile(x, y+1),
+					this.getTile(x-1, y),
+					this.getTile(x-1, y)
+				];
+				return surrounding.some(tile => tile==T.FIRE);
+			};
+			if(this.getTilesOfType(T.FLAMMABLE_S).some(touchingFire)) return this.die("didn't know oil was flammable", "stood on oil when it caught on fire");
+			this.getTilesOfType(T.FLAMMABLE).filter(touchingFire).forEach(pos => this.putTileA(pos, T.FIRE));
+		}
+
+		// THE WORLD!
+		if(!this.rules.timeFlow) {
+			this.lastDirection=[0, 0];
+			this.direction=[0, 0];
+		}
+
+		// victory condition
+		if(this.rules.winCondition=='fruit') {
+			if(!this.fruits.length) return this.win();
+		}
+		if(this.rules.winCondition=='time') {
+			if(this.playTime>=this.rules.gameDuration) return this.win();
+		}
+		if(this.rules.winCondition=='score') {
+			if(this.score>=this.rules.scoreObjective) return this.win();
+		}
+		if(this.rules.scoreSystem=='moves') {
+			if(this.score) this.score--;
+		}
+	}
+
+	tick() {
+		if(!this.playing) return;
+		if(!this.lastStep) this.lastStep=this.firstStep;
+		this.draw();
+		if(this.callback) this.callback('tick');
+		if(this.rules.timeFlow && this.lastStep+this.delay<Date.now()) {
+			this.lastStep+=this.delay;
+			this.step();
+		}
+		if(!this.rules.timeFlow && (this.direction[0]!=0 || this.direction[1]!=0)) {
+			this.step();
+		}
+		requestAnimationFrame(() => this.tick());
+	}
+
+	win() {
+		this.playing=false;
+		this.endPlayTime=this.playTime;
+		if(this.callback) this.callback('win');
+	}
+
+	die(message='died', reason='died') {
+		this.playing=false;
+		this.endPlayTime=this.playTime;
+		this.death={message, reason};
+		if(this.callback) this.callback('die');
+	}
+
+	handleInputs(inputs) {
+		const config=require('config');
+
+		// change direction if the input is valid
+		const trySet=(dir) => {
+			if(!dir.every((e, i) => e==this.lastDirection[i] || e==-this.lastDirection[i])) {
+				this.direction=dir;
+				return true;
+			}
+		}
+
+		// reduce buffer duration
+		Object
+			.keys(inputs)
+			.forEach(k => {
+				let v=inputs[k];
+				if(v===true) v=5;
+				v--;
+				if(!v) delete inputs[k];
+				else inputs[k]=v;
+			});
+
+		// try all inputs in order and unbuffer them if valid
+		if(inputs.left && trySet([-1, 0])) delete inputs.left;
+		else if(inputs.right && trySet([ 1, 0])) delete inputs.right;
+		else if(inputs.up && trySet([ 0,-1])) delete inputs.up;
+		else if(inputs.down &&  trySet([ 0, 1])) delete inputs.down;
+
+		// buffering might be disabled
+		if(!config.getB('input.buffer')) {
+			Object
+				.keys(inputs)
+				.forEach(k => delete inputs[k]);
+		}
+	}
+
+	start() {
+		this.firstStep=Date.now();
+		this.tickId=0;
+		this.playing=true;
+		requestAnimationFrame(() => this.tick());
+	}
+}
+
+return module.exports=SnekGame;

src/js/tiles.js

@@ -0,0 +1,221 @@
+const [
+	EMPTY, SNAKE,
+	FOOD, SUPER_FOOD, DECAY_FOOD,
+	WALL,
+	FIRE, FLAMMABLE, FLAMMABLE_S,
+	HOLE, HOLE_S,
+	PORTAL_A, PORTAL_A_S, PORTAL_B, PORTAL_B_S, PORTAL_C, PORTAL_C_S, PORTAL_D, PORTAL_D_S,
+	KEY, DOOR,
+	SWITCH_ON, SWITCH_ON_S, SWITCH_OFF, SWITCH_OFF_S, SPIKES_OFF, SPIKES_OFF_S, SPIKES_ON
+]=Array(255).keys();
+
+const tiles={
+	EMPTY, SNAKE,
+	FOOD, SUPER_FOOD, DECAY_FOOD,
+	WALL,
+	FIRE, FLAMMABLE, FLAMMABLE_S,
+	HOLE, HOLE_S,
+	PORTAL_A, PORTAL_A_S, PORTAL_B, PORTAL_B_S, PORTAL_C, PORTAL_C_S, PORTAL_D, PORTAL_D_S,
+	KEY, DOOR,
+	SWITCH_ON, SWITCH_ON_S, SWITCH_OFF, SWITCH_OFF_S, SPIKES_OFF, SPIKES_OFF_S, SPIKES_ON
+};
+
+const tileNames=(() => {
+	let tileNames=[];
+	Object.keys(tiles).forEach(key => tileNames[tiles[key]]=key);
+	return tileNames;
+})();
+
+const getName=t =>
+	tileNames[t] || `Unknown tile ${t}`;
+
+const forChar=c => {
+	switch(c) {
+	 	case ' ': return EMPTY;
+		case 'f': return FOOD;
+		case 'F': return SUPER_FOOD;
+		case 'd': return DECAY_FOOD;
+		case 'w': return WALL;
+		case 'o': return HOLE;
+		case 'i': return FIRE;
+		case 'I': return FLAMMABLE;
+		case 'A': return PORTAL_A;
+		case 'B': return PORTAL_B;
+		case 'C': return PORTAL_C;
+		case 'D': return PORTAL_D;
+		case 'k': return KEY;
+		case 'K': return DOOR;
+		case 's': return SWITCH_OFF;
+		case 'S': return SPIKES_ON;
+		case 't': return SPIKES_OFF;
+	}
+	throw TypeError(`'${c}' doesn't correspond to any tile`);
+};
+
+const charFor=t => {
+	switch(t) {
+		case EMPTY:			return ' ';
+		case FOOD:			return 'f';
+		case SUPER_FOOD:	return 'F';
+		case DECAY_FOOD:	return 'd';
+		case WALL:			return 'w';
+		case HOLE:			return 'o';
+		case FIRE:			return 'i';
+		case FLAMMABLE:		return 'I';
+		case PORTAL_A:		return 'A';
+		case PORTAL_B:		return 'B';
+		case PORTAL_C:		return 'C';
+		case PORTAL_D:		return 'D';
+		case KEY:			return 'k';
+		case DOOR:			return 'K';
+		case SWITCH_OFF:	return 's';
+		case SPIKES_ON:		return 'S';
+		case SPIKES_OFF:	return 't';
+	}
+	throw TypeError(`'${getName(t)}' doesn't have a corresponding character'`);
+};
+
+const snakeVersion=t => {
+	switch(t) {
+		case EMPTY:			return SNAKE;
+		case HOLE:			return HOLE_S;
+		case FLAMMABLE:		return FLAMMABLE_S;
+		case PORTAL_A:		return PORTAL_A_S;
+		case PORTAL_B:		return PORTAL_B_S;
+		case PORTAL_C:		return PORTAL_C_S;
+		case PORTAL_D:		return PORTAL_D_S;
+		case SWITCH_OFF:	return SWITCH_OFF_S;
+		case SWITCH_ON:		return SWITCH_ON_S;
+		case SPIKES_OFF:	return SPIKES_OFF_S;
+	}
+	throw TypeError(`'${getName(t)}' doesn't have a snake version'`);
+};
+
+const nonSnakeVersion=t => {
+	switch(t) {
+		case SNAKE:			return EMPTY;
+		case HOLE_S:		return HOLE;
+		case FLAMMABLE_S:	return FLAMMABLE;
+		case PORTAL_A_S:	return PORTAL_A;
+		case PORTAL_B_S:	return PORTAL_B;
+		case PORTAL_C_S:	return PORTAL_C;
+		case PORTAL_D_S:	return PORTAL_D;
+		case SWITCH_OFF_S:	return SWITCH_OFF;
+		case SWITCH_ON_S:	return SWITCH_ON;
+		case SPIKES_OFF_S:	return SPIKES_OFF;
+	}
+	throw TypeError(`'${getName(t)}' doesn't have a non-snake version'`);
+};
+
+const isSnakeVersion=t => {
+	switch(t) {
+		case SNAKE:
+		case HOLE_S:
+		case FLAMMABLE_S:
+		case PORTAL_A_S: case PORTAL_B_S: case PORTAL_C_S: case PORTAL_D_S:
+		case SWITCH_OFF_S: case SWITCH_ON_S:
+		case SPIKES_OFF_S:
+			return true;
+	}
+	return false;
+};
+
+const isNonSnakeVersion=t => {
+	switch(t) {
+		case EMPTY:
+		case HOLE:
+		case FLAMMABLE:
+		case PORTAL_A: case PORTAL_B: case PORTAL_C: case PORTAL_D:
+		case SWITCH_OFF: case SWITCH_ON:
+		case SPIKES_OFF:
+			return true;
+	}
+	return false;
+};
+
+const isSafe=t => {
+	switch(t) {
+		case EMPTY:
+		case HOLE:
+		case FLAMMABLE:
+		case PORTAL_A: case PORTAL_B: case PORTAL_C: case PORTAL_D:
+		case SWITCH_OFF: case SWITCH_ON:
+		case SPIKES_OFF:
+		case FOOD: case SUPER_FOOD: case DECAY_FOOD:
+		case KEY:
+			return true;
+	}
+	return false;
+};
+
+const isWall=t => {
+	switch(t) {
+		case WALL:
+		case FIRE:
+		case DOOR:
+		case SPIKES_ON:
+			return true;
+	}
+	return false;
+};
+
+const getType=t => {
+	if(isSnakeVersion(t)) return 'snake';
+	if(isWall(t)) return 'wall';
+
+	switch(t) {
+		case EMPTY:
+		case FLAMMABLE:
+		case SPIKES_OFF:
+			return 'empty';
+
+		case FOOD:
+			return 'food';
+
+		case SUPER_FOOD:
+		case DECAY_FOOD:
+			return 'bonus';
+
+		case HOLE:
+			return 'hole';
+
+		case PORTAL_A:
+		case PORTAL_B:
+		case PORTAL_C:
+		case PORTAL_D:
+			return 'portal';
+
+		case KEY:
+			return 'key';
+
+		case SWITCH_ON:
+		case SWITCH_OFF:
+			return 'switch';
+	}
+
+	throw TypeError(`'${getName(t)}' isn't a valid tile`);
+};
+
+const isPortal=t => {
+	switch(t) {
+		case PORTAL_A:
+		case PORTAL_B:
+		case PORTAL_C:
+		case PORTAL_D:
+		case PORTAL_A_S:
+		case PORTAL_B_S:
+		case PORTAL_C_S:
+		case PORTAL_D_S:
+			return true;
+	}
+	return false;
+};
+
+return module.exports={
+	tiles,
+	tileNames, getName,
+	forChar, charFor,
+	snakeVersion, nonSnakeVersion, isSnakeVersion, isNonSnakeVersion,
+	isSafe, isWall, isPortal,
+	getType
+};

src/less/fullreset.less

@@ -0,0 +1,102 @@
+/*
+html5doctor.com Reset Stylesheet
+v1.6.1
+Last Updated: 2010-09-17
+Author: Richard Clark - http://richclarkdesign.com
+Twitter: @rich_clark
+*/
+
+html, body, div, span, object, iframe,
+h1, h2, h3, h4, h5, h6, p, blockquote, pre,
+abbr, address, cite, code,
+del, dfn, em, img, ins, kbd, q, samp,
+small, strong, sub, sup, var,
+b, i,
+dl, dt, dd, ol, ul, li,
+fieldset, form, label, legend,
+table, caption, tbody, tfoot, thead, tr, th, td,
+article, aside, canvas, details, figcaption, figure,
+footer, header, hgroup, menu, nav, section, summary,
+time, mark, audio, video {
+    margin:0;
+    padding:0;
+    border:0;
+    outline:0;
+    font-size:100%;
+    vertical-align:baseline;
+    background:transparent;
+}
+
+body {
+    line-height:1;
+}
+
+article,aside,details,figcaption,figure,
+footer,header,hgroup,menu,nav,section {
+    display:block;
+}
+
+nav ul {
+    list-style:none;
+}
+
+blockquote, q {
+    quotes:none;
+}
+
+blockquote:before, blockquote:after,
+q:before, q:after {
+    content:'';
+    content:none;
+}
+
+a {
+    margin:0;
+    padding:0;
+    font-size:100%;
+    vertical-align:baseline;
+    background:transparent;
+}
+
+/* change colours to suit your needs */
+ins {
+    background-color:#ff9;
+    color:#000;
+    text-decoration:none;
+}
+
+/* change colours to suit your needs */
+mark {
+    background-color:#ff9;
+    color:#000;
+    font-style:italic;
+    font-weight:bold;
+}
+
+del {
+    text-decoration: line-through;
+}
+
+abbr[title], dfn[title] {
+    border-bottom:1px dotted;
+    cursor:help;
+}
+
+table {
+    border-collapse:collapse;
+    border-spacing:0;
+}
+
+/* change border colour to suit your needs */
+hr {
+    display:block;
+    height:1px;
+    border:0;  
+    border-top:1px solid #cccccc;
+    margin:1em 0;
+    padding:0;
+}
+
+input, select {
+    vertical-align:middle;
+}

src/less/help.less

@@ -0,0 +1,16 @@
+.help {
+	display: block;
+
+	article {
+		margin-bottom: 2ex;
+	}
+
+	section {
+		margin-bottom: 1ex;
+	}
+
+	ul {
+		margin-left: 2ex;
+		font-size: 1.6em;
+	}
+}

src/less/hud.less

@@ -0,0 +1,58 @@
+#hud {
+	position: fixed;
+	top: 0;
+	left: 0;
+	width: 100vw;
+	height: 100vh;
+
+	pointer-events: none;
+
+	& > * {
+		position: fixed;
+		pointer-events: auto;
+	}
+
+	.restart {
+		top: 0;
+		right: 0;
+		cursor: pointer;
+
+		&::before {
+			content: '⟳';
+			font-size: 5vh;
+			opacity: .5;
+			color: @accentfg;
+		}
+	}
+
+	.crosspadOverlay {
+		pointer-events: none;
+		top: 50vh;
+		left: 50vw;
+		transform: translate(-50%, -50%);
+		opacity: .5;
+	}
+
+	.joystickOverlay {
+		pointer-events: none;
+		transform: translate(-50%, -50%);
+		opacity: .5;
+	}
+
+	.status {
+		bottom: 1rem;
+		right: 1rem;
+		padding: .2rem;
+		font-size: 1.4rem;
+
+		.score::before {
+			content: '\1f34e';
+		}
+		.time::before {
+			content: '\23f1';
+		}
+		.speed::before {
+			content: '\1f684';
+		}
+	}
+}

src/less/mainMenu.less

@@ -0,0 +1,32 @@
+nav {
+	flex: 1;
+	font-size: 1.6rem;
+	display: flex;
+	justify-content: space-evenly;
+	align-self: center;
+
+	section {
+		flex: 1;
+		max-width: 50vh;
+		margin: 2rem;
+	}
+
+	p {
+		margin-bottom: 1rem;
+	}
+	
+	ul {
+		padding-left: 2rem;
+	}
+
+	li {
+		list-style-type: disc;
+
+		* {
+			display: block;
+		}
+
+		margin: .5rem;
+	}
+
+}

src/less/popup.less

@@ -0,0 +1,127 @@
+@keyframes popupAppear {
+	0% {
+		background: rgba(0, 0, 0, 0%);
+	}
+	100% {
+		background: rgba(0, 0, 0, 90%);
+	}
+}
+
+.popup {
+	&.animation {
+		animation: popupAppear 1s linear;
+	}
+
+	background: rgba(0, 0, 0, 90%);
+
+	position: absolute;
+	top: 0;
+	left: 0;
+	height: 100%;
+	width: 100%;
+
+	.content {
+		border-radius: 2rem;
+		background: @bg;
+		text-align: center;
+		box-shadow: black 0 0 1rem;
+
+		position: absolute;
+		top: 50%;
+		left: 50%;
+		transform: translate(-50%, -50%);
+		box-sizing: border-box;
+
+		padding: 2rem;
+		display: flex;
+		flex-direction: column;
+
+		font-size: 1.4rem;
+
+		&.large {
+			width: 80vw;
+			height: 80vh;
+		}
+
+		& > section {
+			margin: 1rem;
+
+			&:first-of-type {
+				display: flex;
+				flex-direction: column;
+				align-items: center;
+				overflow-y: auto;
+				flex: 1;
+
+				& > * {
+					margin: .5rem;
+				}
+			}
+
+			&:last-of-type {
+				display: flex;
+
+				& > * {
+					flex: 1;
+				}
+			}
+		}
+
+		.dual {
+			display: flex;
+			flex-direction: column;
+			width: 100%;
+
+			tr {
+				display: flex;
+			}
+			th {
+				text-align: right;
+				&::after {
+					content: ':';
+				}
+			}
+			td {
+				text-align: left;
+			}
+			th, td {
+				padding: 0 .5rem;
+				flex: 1;
+			}
+		}
+
+		.table {
+			width: 100%;
+
+			td, th {
+				padding: .5rem;
+			}
+		}
+
+		label {
+			margin-right: 1ex;
+		}
+
+		button {
+			display: inline;
+			color: @accentfg;
+			background: @accentbg;
+			font-weight: bold;
+
+			cursor: pointer;
+
+			border-radius: 1rem;
+			border: 0;
+			padding: 2rem;
+			margin: 1rem;
+
+			transition: box-shadow .5s;
+
+			&:hover {
+				color: @fg;
+				text-decoration: underline;
+				box-shadow: black 0 0 2rem;
+			}
+		}
+	}
+}

src/less/progressBar.less

@@ -0,0 +1,15 @@
+.progressBar {
+	position: fixed;
+	top: 50%;
+	left: 50%;
+	background: white;
+	box-shadow: black 0 0 2rem;
+	border-radius: 100vh;
+	transform: translate(-50%, -50%);
+	transition: top .5s ease-in-out;
+
+	&.hiddenBottom {
+		top: 200vh;
+	}
+}
+

src/less/snek.less

@@ -0,0 +1,167 @@
+// full CSS reset
+@import 'fullreset.less';
+
+// load the font
+@import url('https://fonts.googleapis.com/css?family=Fira+Code:400,700&display=swap');
+html {
+	font-family: 'Fira Code', monospace;
+}
+
+// setup REM units
+html {
+	font-size: 62.5% !important;
+}
+
+// setup the colors and styles
+@accentbg: #fba49b;
+@bg: #ffefdf;
+@accentfg: #930a16;
+@fg: #23090d;
+
+body {
+	color: @fg;
+}
+
+h1, h2, h3, h4, h5, h6, strong, a {
+	color: @accentfg;
+	font-weight: bold;
+}
+
+h1, h2, h3, h4, h5, h6 {
+	margin-bottom: .1em;
+}
+
+p + p {
+	margin-top: 1em;
+}
+
+a {
+	text-decoration: inherit;
+	display: contents;
+}
+
+a:hover {
+	color: @fg;
+	text-decoration: underline;
+}
+
+em {
+	font-style: italic;
+}
+
+code {
+	background: @accentbg;
+	font-weight: bold;
+}
+
+header, footer {
+	background: @accentbg;
+
+	img {
+		border: 4px solid @accentfg;
+		border-radius: 2px;
+	}
+}
+
+// setup the layout
+html, body {
+	display: flex;
+	flex-direction: column;
+	height: 100%;
+}
+
+header img, footer img {
+	float: left;
+	margin-right: 1rem;
+}
+header img {
+	height: 8rem;
+	&:hover {
+		border-color: @fg;
+	}
+}
+footer img {
+	height: 4rem;
+}
+
+header ul {
+	display: flex;
+	list-style-type: none;
+
+	li {
+		margin-right: 1ex;
+		font-size: 2rem;
+
+		a {
+			color: @fg;
+
+			&:hover {
+				color: @accentfg;
+			}
+		}
+	}
+}
+
+header, footer, main {
+	padding: 2rem;
+}
+main {
+	flex: 1;
+	display: flex;
+	position: relative;
+	background: @bg;
+
+	canvas {
+		position: absolute;
+		top: 0;
+		left: 0;
+	}
+}
+
+h1 {
+	font-size: 4rem;
+}
+h2 {
+	font-size: 2rem;
+}
+h3 {
+	font-size: 1.9rem;
+}
+h4 {
+	font-size: 1.8rem;
+}
+h5 {
+	font-size: 1.7rem;
+}
+p {
+	font-size: 1.6rem;
+}
+
+.hidden {
+	display: none !important;
+}
+
+body.serverless .server {
+	display: none !important;
+}
+body.server .serverless {
+	display: none !important;
+}
+body.loading .loaded {
+	display: none !important;
+}
+
+// setup the progress bar
+@import 'progressBar';
+
+// setup the main menu
+@import 'mainMenu';
+
+// setup the popups
+@import 'popup';
+
+// setup the hud
+@import 'hud';
+
+// setup the help file
+@import 'help';