theoretical task

Alfons.moon

@@ -1,6 +1,7 @@
 tasks:
 	build: =>
-		sh "moon bin/moonbuild.moon -jy"
+		load 'moonbuild'
+		tasks.moonbuild j: true
 	release: =>
 		error "no version provided" unless @v
 		tasks.build!

Build.moon

@@ -16,11 +16,6 @@ with public default target 'all'
 	\after 'bin'
 	\after 'lib'
 
-with public target 'install'
-	\depends 'out/moonbuild'
-	\produces '/usr/local/bin/moonbuild'
-	\fn => _.cmd 'sudo', 'cp', @infile, @outfile
-
 with public target 'clean'
 	\fn => _.cmd RM, LIB_LUA
 	\fn => _.cmd RM, BIN_LUA

Makefile

@@ -16,9 +16,6 @@ MODULES = $(shell echo $(foreach lib, $(LIB_LUA), $(patsubst %.lua, %, $(lib)))
 
 all: bin lib
 
-install: all
-	sudo cp out/moonbuild /usr/local/bin/moonbuild
-
 clean:
 	$(RM) $(LIB_LUA)
 	$(RM) $(BIN_LUA)

bin/task.moon

@@ -0,0 +1,24 @@
+-- load everything we need
+import loadfile from require 'moonscript.base'
+Context = require 'moonbuild.context'
+DepGraph = require 'moonbuild.core.DAG'
+
+tasks:
+	moonbuild: =>
+		args = {
+			nparallel: @parallel or @j
+			quiet: @quiet or @q
+			buildfile: @buildfile or @b
+			force: @force or @f
+		}
+		ctx = Context!
+		ctx\load (loadfile args.buildfile or 'Build.moon'), @
+		ctx\init!
+		dag = DepGraph ctx, #@ == 0 and ctx.defaulttargets or @
+		executor = do
+			Executor = do
+				ok, Executor = pcall -> require 'moonbuild.core.multiprocessexecutor'
+				ok and Executor or require 'moonbuild.core.singleprocessexecutor'
+			args.nparallel = Executor\getmaxparallel! if args.nparallel == true
+			Executor dag, args.nparallel
+		executor\execute args

moonbuild/_util.moon

@@ -14,8 +14,8 @@ _cdeps = (cc, cflags, path) ->
 	rawlist = gsub (match raw, ':(.+)'), '\\\n', ' '
 	[v for v in gmatch rawlist, '%S+']
 cdeps = setmetatable {},
-	__index: (cc) => (path, cflags) -> _cdeps cc, cflags, path
+	__index: (cc) => (cflags, path) -> _cdeps cc, cflags, path
-	__call: (path, cflags) => _cdeps 'cc', cflags, path
+	__call: (cflags, path) => _cdeps 'cc', cflags, path
 
 readfile = (filename) ->
 	fd, err = open filename, 'rb'

moonbuild/core/DAG.moon

@@ -1,4 +1,4 @@
-import first, filter, foreach, flatten, patsubst from require 'moonbuild._common'
+import filter, foreach, flatten, patsubst from require 'moonbuild._common'
 import runwithcontext from require 'moonbuild.compat.ctx'
 globalenv = require 'moonbuild.env.global'
 import exists, parent, mkdirs, clearentry, disableentry, attributes from require 'moonbuild._fs'
@@ -64,7 +64,7 @@ class DepGraph
 		nodes = foreach candidates, (candidate) -> a: {pcall -> DepNode @, candidate, name}
 		resolved = foreach (filter nodes, (node) -> node.a[1]), (node) -> node.a[2]
 		sort resolved, nodepriority
-		resolved[1] or error "Cannot resolve target #{name}: #{#candidates} candidates, #{#resolved} resolved"
+		resolved[1] or error "Cannot resolve target #{name}"
 
 	buildablenodes: =>
 		[v for k, v in pairs @nodes when v\canbuild! and not v.built]
@@ -87,24 +87,16 @@ class DepNode
 			ctx = setmetatable {},
 				__index: (_, k) ->
 					switch k
-						when 'infile'
+						when 'infile' then first deps
-							f = first deps
+						when 'infiles' then flatten deps
-							f and f.name
+						when 'outfile' then first @outs
-						when 'infiles'
+						when 'outfiles' then flatten @outs
-							foreach deps, => @name
+						when 'name' then @name
-						when 'outfile'
+						else error "No such field in TargetDepsContext: #{k}"
-							f = first @outs
-							f and f.name
-						when 'outfiles'
-							foreach @outs, => @name
-						when 'name'
-							@name
-						else
-							error "No such field in TargetDepsContext: #{k}"
 				__newindex: (k) =>
 					error "Attempt to set field #{k} of TargetDepsContext"
 			for depfn in *target.depfunctions
-				deps = flatten deps, foreach (runwithcontext depfn, @dag.env, ctx), resolve
+				deps = flatten deps, foreach depfn, (fn) -> resolve runwithcontext fn, @dag.env, ctx
 		@ins = foreach deps, (dep) -> dep.name
 		@after = foreach after, (dep) -> dep.name
 		@deps = flatten { deps, after }

out/moonbuild

@@ -1272,11 +1272,11 @@ _cdeps = function(cc, cflags, path)
 end
 local cdeps = setmetatable({ }, {
   __index = function(self, cc)
-    return function(path, cflags)
+    return function(cflags, path)
       return _cdeps(cc, cflags, path)
     end
   end,
-  __call = function(self, path, cflags)
+  __call = function(self, cflags, path)
     return _cdeps('cc', cflags, path)
   end
 })
@@ -1646,10 +1646,10 @@ end
 do
 local _ENV = _ENV
 package.preload[ "moonbuild.core.DAG" ] = function( ... ) local arg = _G.arg;
-local first, filter, foreach, flatten, patsubst
+local filter, foreach, flatten, patsubst
 do
   local _obj_0 = require('moonbuild._common')
-  first, filter, foreach, flatten, patsubst = _obj_0.first, _obj_0.filter, _obj_0.foreach, _obj_0.flatten, _obj_0.patsubst
+  filter, foreach, flatten, patsubst = _obj_0.filter, _obj_0.foreach, _obj_0.flatten, _obj_0.patsubst
 end
 local runwithcontext
 runwithcontext = require('moonbuild.compat.ctx').runwithcontext
@@ -1753,7 +1753,7 @@ do
         return node.a[2]
       end)
       sort(resolved, nodepriority)
-      return resolved[1] or error("Cannot resolve target " .. tostring(name) .. ": " .. tostring(#candidates) .. " candidates, " .. tostring(#resolved) .. " resolved")
+      return resolved[1] or error("Cannot resolve target " .. tostring(name))
     end,
     buildablenodes = function(self)
       local _accum_0 = { }
@@ -1936,19 +1936,13 @@ do
           __index = function(_, k)
             local _exp_0 = k
             if 'infile' == _exp_0 then
-              local f = first(deps)
+              return first(deps)
-              return f and f.name
             elseif 'infiles' == _exp_0 then
-              return foreach(deps, function(self)
+              return flatten(deps)
-                return self.name
-              end)
             elseif 'outfile' == _exp_0 then
-              local f = first(self.outs)
+              return first(self.outs)
-              return f and f.name
             elseif 'outfiles' == _exp_0 then
-              return foreach(self.outs, function(self)
+              return flatten(self.outs)
-                return self.name
-              end)
             elseif 'name' == _exp_0 then
               return self.name
             else
@@ -1962,7 +1956,9 @@ do
         local _list_0 = target.depfunctions
         for _index_0 = 1, #_list_0 do
           local depfn = _list_0[_index_0]
-          deps = flatten(deps, foreach((runwithcontext(depfn, self.dag.env, ctx)), resolve))
+          deps = flatten(deps, foreach(depfn, function(fn)
+            return resolve(runwithcontext(fn, self.dag.env, ctx))
+          end))
         end
       end
       self.ins = foreach(deps, function(dep)

rockspecs/moonbuild-2.1.0-1.rockspec

@@ -1,24 +0,0 @@
-build = {
-  install = {
-    bin = {
-      moonbuild = "out/moonbuild"
-    }
-  },
-  type = "builtin"
-}
-dependencies = {
-  "lua >= 5.1",
-  "argparse >= 0.7.1-1",
-  "moonscript >= 0.5.0-1"
-}
-description = {
-  detailed = "moonbuild is a small build system that simplifies your build definitions by allowing you to use declarative as well as imperative rules. It represents the build as a DAG with explicit ordering, and doesn't give you any default confusing rules (unlike make). If you can, installing luaposix and/or luafilesystem will speed up builds and increase stability.\n",
-  summary = "Small build system in between make and a build.sh"
-}
-package = "moonbuild"
-rockspec_format = "3.0"
-source = {
-  tag = "v2.1.0",
-  url = "git://github.com/natnat-mc/moonbuild"
-}
-version = "2.1.0-1"

rockspecs/moonbuild-2.1.0-2.rockspec

@@ -1,24 +0,0 @@
-build = {
-  install = {
-    bin = {
-      moonbuild = "out/moonbuild"
-    }
-  },
-  type = "builtin"
-}
-dependencies = {
-  "lua >= 5.1",
-  "argparse >= 0.7.1-1",
-  "moonscript >= 0.5.0-1"
-}
-description = {
-  detailed = "moonbuild is a small build system that simplifies your build definitions by allowing you to use declarative as well as imperative rules. It represents the build as a DAG with explicit ordering, and doesn't give you any default confusing rules (unlike make). If you can, installing luaposix and/or luafilesystem will speed up builds and increase stability.\n",
-  summary = "Small build system in between make and a build.sh"
-}
-package = "moonbuild"
-rockspec_format = "3.0"
-source = {
-  tag = "v2.1.0",
-  url = "git://github.com/natnat-mc/moonbuild"
-}
-version = "2.1.0-2"