Producing rockspec 2.7.1-1

.gitattributes

@@ -0,0 +1,3 @@
+*.lua linguist-generated
+out/* linguist-generated
+Makefile -linguist-detectable

Alfons.moon

@@ -7,6 +7,7 @@ tasks:
 		tasks.build!
 		sh "rockbuild -m -t #{@v} upload"
 
+	watch: => watch {'.'}, {'.git'}, 'live', (glob '*.moon'), pcall -> moonbuild j: true
 	build: => moonbuild j: true
 	install: => moonbuild 'install', j: true
 	clean: => moonbuild 'clean'

Build.moon

@@ -1,4 +1,3 @@
-public var MOONC: 'moonc'
 public var AMALG: 'amalg.lua'
 public var RM: 'rm', '-f', '--'
 public var LUA: 'lua5.3'
@@ -41,27 +40,23 @@ with public target 'mrproper'
 	\after 'clean'
 	\fn => _.cmd RM, BIN, LIB
 
-with public target 'bin'
+with pipeline! -- lib
-	\depends BIN
+	\sources LIB_SRC
+	\step 'compile-lib'
+		pattern: {'%.moon', '%.lua'}
+		fn: => _.moonc @infile, @out
+	\step 'lib'
+		output: LIB
+		fn: => _.cmd AMALG, '-o', @out, '-s', 'moonbuild/init.lua', _.exclude MODULES, 'moonbuild.init'
 
-with public target 'lib'
+with pipeline! -- bin
-	\depends LIB_LUA, LIB
+	\sources BIN_SRC
-
+	\step 'compile-bin'
-with target BIN, pattern: 'out/%'
+		pattern: {'%.moon', '%.lua'}
-	\depends 'bin/%.lua'
+		fn: => _.moonc @infile, @out
-	\produces 'out/%'
+	\step 'bin'
-	\mkdirs!
+		pattern: {'bin/%.lua', 'out/%'}
-	\fn =>
+		mkdirs: true
+		fn: =>
 			_.writefile @out, "#!/usr/bin/env #{LUA}\n#{_.readfile @infile}"
 			_.cmd 'chmod', '+x', @out
-
-with target LIB
-	\depends 'moonbuild/init.lua'
-	\depends LIB_LUA
-	\produces '%'
-	\fn => _.cmd AMALG, '-o', @out, '-s', @infile, _.exclude MODULES, 'moonbuild.init'
-
-with target {LIB_LUA, BIN_LUA}, pattern: '%.lua'
-	\depends '%.moon'
-	\produces '%.lua'
-	\fn => _.moonc @infile, @out

bin/moonbuild.moon

@@ -1,8 +1,9 @@
 -- load everything we need
 import loadfile from require 'moonscript.base'
 import Context, DepGraph, Executor from require 'moonbuild'
-Variable = (require 'moonbuild')['core.Variable']
+Variable = require 'moonbuild.core.Variable'
-import parseargs from (require 'moonbuild')['_cmd.common']
+import verbose from require 'moonbuild._common'
+import parseargs from require 'moonbuild._cmd.common'
 argparse = require 'argparse'
 import sort, concat from table
 import exit from os
@@ -34,12 +35,13 @@ for set in *args.set_list
 
 args.parallel = args.parallel == 'y' and 'y' or ((tonumber args.parallel) or error "Invalid argument for -j: #{args.parallel}")
 error "Invalid argument for -j: #{args.parallel}" if args.parallel != 'y' and (args.parallel<1 or args.parallel%1 != 0)
-print "Parsed CLI args" if args.verbose
+verbose args.verbose or false
+verbose "Parsed CLI args"
 
 -- load the buildfile
 ctx = Context!
 ctx\load (loadfile args.buildfile), overrides
-print "Loaded buildfile" if args.verbose
+verbose "Loaded buildfile"
 
 -- handle -l and -V
 if args.list
@@ -65,16 +67,16 @@ if args.list_variables
 
 -- initialize the buildfile further
 ctx\init!
-print "Initialized buildfile" if args.verbose
+verbose "Initialized buildfile"
 
 -- create the DAG
 targets = #args.targets==0 and ctx.defaulttargets or args.targets
 dag = DepGraph ctx, targets
-print "Created dependancy graph" if args.verbose
+verbose print "Created dependancy graph"
 
 -- execute the build
 nparallel = args.parallel == 'y' and Executor\getmaxparallel! or args.parallel
-print "Building with #{nparallel} max parallel process#{nparallel>1 and "es" or ""}" if args.verbose
+verbose "Building with #{nparallel} max parallel process#{nparallel>1 and "es" or ""}"
 executor = Executor dag, nparallel
 executor\execute args
-print "Finished" if args.verbose
+verbose "Finished"

moonbuild/_cmd.moon

@@ -1,4 +1,5 @@
-import parseargs, escape from require 'moonbuild._cmd.common'
+import parseargs, escape, cmdline from require 'moonbuild._cmd.common'
+import verbose from require 'moonbuild._common'
 
 ok, cmd, backend = false, nil, nil
 unless ok
@@ -17,6 +18,17 @@ cmd.backend = backend
 cmd.parseargs = parseargs
 cmd.escape = escape
 
+-- make verbose verisons of _.cmd, _.cmdrst and _.sh
+for f in *({'cmd', 'cmdrst'})
+	orig = cmd[f]
+	cmd[f] = (...) ->
+		verbose "[#{f}] #{cmdline ...}"
+		orig ...
+_sh = cmd.sh
+cmd.sh = (cli) ->
+	verbose "[sh] #{cli}"
+	_sh cli
+
 -- derived cmd functions
 _cmd = cmd.cmd
 _cmdrst = cmd.cmdrst

moonbuild/_cmd/common.moon

@@ -1,5 +1,6 @@
 import gsub, sub, match from string
 import concat from table
+import flatten from require 'moonbuild._common'
 
 specialchars =
 	'\"': '\\\"'
@@ -115,7 +116,11 @@ parseargs = (argstr) ->
 
 	args
 
+cmdline = (...) ->
+	concat [escape arg for arg in *flatten ...], ' '
+
 {
 	:escape
 	:parseargs
+	:cmdline
 }

moonbuild/_cmd/lua.moon

@@ -1,12 +1,9 @@
-import escape from require 'moonbuild._cmd.common'
+import cmdline from require 'moonbuild._cmd.common'
 import flatten from require 'moonbuild._common'
 import execute from require 'moonbuild.compat.execute'
 import popen from io
 import concat from table
 
-cmdline = (...) ->
-	concat [escape arg for arg in *flatten ...], ' '
-
 cmd = (...) ->
 	ok, ret, code = execute cmdline ...
 	error "command #{first ...} exited with #{code} (#{ret})" unless ok
@@ -19,6 +16,7 @@ cmdrst = (...) ->
 	data
 
 sh = (cli) ->
+	verbose -> print '[sh] ' .. cli
 	ok, ret, code = execute cli
 	error "command '#{cli}' exited with #{code} (#{ret})" unless ok
 

moonbuild/_cmd/posix.moon

@@ -37,6 +37,7 @@ cmdrst = (...) ->
 	data
 
 sh = (cli) ->
+	verbose -> print '[sh] ' .. cli
 	cmd 'sh', '-c', cli
 
 {

moonbuild/_common.moon

@@ -147,6 +147,19 @@ minmax = (list) ->
 		M = e if e>M
 	m, M
 
+_verbose = false
+verbose = (arg) ->
+	if arg == nil
+		_verbose
+	elseif (type arg) == 'function'
+		arg! if _verbose
+	elseif (type arg) == 'boolean'
+		_verbose = arg
+	elseif (type arg) == 'string'
+		print arg if _verbose
+	else
+		error "_.verbose takes either no argument, a boolean, a function or a string"
+
 common.flatten = flatten
 common.first = first
 common.foreach = foreach
@@ -159,5 +172,6 @@ common.exclude = exclude
 common.min = min
 common.max = max
 common.minmax = minmax
+common.verbose = verbose
 
 setmetatable common, __call: => [k for k in pairs common]

moonbuild/_fs.moon

@@ -166,10 +166,16 @@ mkdir = (dir) ->
 	clearentry parent dir
 
 mkdirs = (dir) ->
-	return if isdir dir
+	if attr = attributes normalizepath dir
-	error "Can't mkdirs #{dir}: file exists" if exists dir
+		return if attr.mode == 'directory'
+		error "Can't mkdirs #{dir}: file exists"
 	mkdirs parent dir
-	mkdir dir
+	unless pcall -> actualmkdir dir
+		clearentry parent dir
+		clearentry dir
+		error "Failed to mkdirs #{dir}: last mkdir failed" unless isdir dir
+	clearentry parent dir
+	clearentry dir
 
 -- from the backend
 fs = {k, withcache fn for k, fn in pairs fs}

moonbuild/_util.moon

@@ -1,5 +1,6 @@
 import to_lua from require 'moonscript.base'
 import parseargs, cmdrst from require 'moonbuild._cmd'
+import verbose from require 'moonbuild._common'
 import gmatch, match, gsub from string
 import open from io
 
@@ -34,6 +35,7 @@ writefile = (filename, data) ->
 	nil
 
 moonc = (infile, outfile) ->
+	verbose "[moonc] #{infile} #{outfile}"
 	code, err = to_lua readfile infile
 	error "Failed to compile #{@infile}: #{err}" unless code
 	writefile outfile, code

moonbuild/core/DAG.moon

@@ -56,22 +56,44 @@ class DepGraph
 
 	addnode: (name) =>
 		return if @nodes[name]
-		elected = @resolvedeps name
+		elected = @topresolvedeps name
 		@nodes[name] = elected
 		for dep in *(transclosure elected, 'deps')
 			@nodes[dep.name] = dep
 			dep.deps = nil
 		elected.deps = nil
 
-	resolvedeps: (name) =>
+	topresolvedeps: (name) =>
+		errors = {}
+		ok, rst = pcall -> @resolvedeps name, nil, errors
+		if ok
+			rst
+		else
+			msg = {"Failed to resolve target \'#{name}\'\n"}
+			for e in *errors
+				if e.err\match '^moonbuild'
+					e.err = e.err\match ': (.+)$'
+			for i=#errors, 1, -1
+				e = errors[i]
+				insert msg, "#{string.rep '| ', e.level - 1}+-[#{e.name}] level #{e.level}: #{e.err}"
+			insert msg, ''
+			error table.concat msg, '\n'
+
+	resolvedeps: (name, level=1, errors={}) =>
 		do
 			node = @nodes[name]
-			return node, {} if node
+			if node
+				print "deps(#{name}) = #{node.name or '[noname]'}"
+				return node, {}
 		candidates = filter {@ctx.targets, FileTarget!}, (target) -> target\matches name
-		nodes = foreach candidates, (candidate) -> a: {pcall -> DepNode @, candidate, name}
+		nodes = foreach candidates, (candidate) -> a: {pcall -> DepNode @, candidate, name, level, errors}
 		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"
+		unless resolved[1]
+			err = "Cannot resolve target #{name}: #{#candidates} candidates, #{#resolved} resolved"
+			table.insert errors, {:name, :level, :err}
+			error err
+		resolved[1]
 
 	buildablenodes: =>
 		[v for k, v in pairs @nodes when v\canbuild! and not v.built]
@@ -91,7 +113,7 @@ class DepGraph
 			insert stack, n for n in *(node\children!)
 
 class DepNode
-	new: (@dag, target, @name) =>
+	new: (@dag, target, @name, @level, errors) =>
 		@priority = target.priority
 		@buildfunctions = target.buildfunctions
 		@mkdirs = target._mkdirs
@@ -101,7 +123,7 @@ class DepNode
 		@type = 'virtual' if #@outs == 0
 		@built = false
 
-		resolve = (name) -> @dag\resolvedeps patsubst @name, target.pattern, name
+		resolve = (name) -> @dag\resolvedeps (patsubst @name, target.pattern, name), level + 1, errors
 		after = flatten foreach target.needtargets, resolve
 		deps = flatten foreach target.infiles, resolve
 		if #target.depfunctions!=0
@@ -149,7 +171,7 @@ class DepNode
 
 		return false if @built or #@buildfunctions == 0
 		return false unless force or @shouldbuild!
-		print "#{@type == 'virtual' and "Running" or "Building"} #{@name}" unless quiet
+		print "#{@type == 'virtual' and "Running" or "Building"} #{@name} [level #{@level}]" unless quiet
 		@actuallybuild!
 		true
 

moonbuild/core/Pipeline.moon

@@ -0,0 +1,56 @@
+Target = require 'moonbuild.core.Target'
+_ = require 'moonbuild._'
+import flatten, patsubst from _
+
+class Pipeline
+	new: (@ctx) =>
+		@lastsources = {}
+
+	sources: (...) =>
+		@lastsources = flatten @lastsources, ...
+	source: (src) =>
+		@lastsources = flatten @lastsources, src
+
+	step: (name, params) =>
+		public = true
+		public, params = false, name if (type name) == 'table'
+
+		tgttype = if params.pattern
+			error "pattern must be a table with the same format as patsubst" unless (type params.pattern) == 'table' and (type params.pattern[1]) == 'string' and (type params.pattern[2]) == 'string'
+			'pattern'
+		elseif params.output or params.out
+			error "output must be a string" unless (type params.output or params.out) == 'string'
+			'single'
+		else
+			error "invalid step type for pipeline: must be pattern or single (out/output)"
+
+		tgtouts = switch tgttype
+			when 'pattern' then patsubst @lastsources, params.pattern[1], params.pattern[2]
+			when 'single' then params.output or params.out
+
+		tgtpatt = switch tgttype
+			when 'pattern' then params.pattern[2]
+			when 'single' then nil
+
+		tgtins = switch tgttype
+			when 'pattern' then params.pattern[1]
+			when 'single' then @lastsources
+
+		tgtprod = switch tgttype
+			when 'pattern' then params.pattern[2]
+			when 'single' then '%'
+
+		tgt = with Target @ctx, tgtouts, pattern: tgtpatt
+			\depends tgtins
+			\produces tgtprod
+			\fn params.fn or error "pipeline steps need a fn"
+		tgt\mkdirs! if params.mkdirs
+		tgt\sync! if params.sync
+		@ctx\addtarget tgt
+
+		if public
+			@ctx\addtarget with Target @ctx, name
+				\depends tgtouts
+				.public = true
+
+		@lastsources = tgtouts

moonbuild/env/init.moon

@@ -1,5 +1,6 @@
 Target = require 'moonbuild.core.Target'
 Variable = require 'moonbuild.core.Variable'
+Pipeline = require 'moonbuild.core.Pipeline'
 _ = require 'moonbuild._'
 import flatten from _
 
@@ -18,8 +19,8 @@ import flatten from _
 	rawset env, '_G', env
 	rawset env, '_ENV', env
 
-	rawset env, 'var', (name, ...) ->
+	rawset env, 'var', (...) ->
-		var = Variable name, ...
+		var = Variable ...
 		ctx\addvar var
 		rawset varlayer, var.name, var.value
 		var
@@ -29,4 +30,7 @@ import flatten from _
 		ctx\addtarget target
 		target
 
+	rawset env, 'pipeline', ->
+		Pipeline ctx
+
 	env, varlayer

moonbuild/init.moon

@@ -33,22 +33,25 @@ moonbuild = (...) ->
 	verbose = opts.verbose or opts.v or false
 	opts.verbose = verbose
 
+	-- set verbosity level
+	_.verbose verbose
+
 	-- create context and DAG
 	ctx = Context!
 	ctx\load (loadfile buildfile), opts
-	print "Loaded buildfile" if verbose
+	_.verbose "Loaded buildfile"
 	ctx\init!
-	print "Initialized buildfile" if verbose
+	_.verbose "Initialized buildfile"
 	targets = #opts==0 and ctx.defaulttargets or opts
 	dag = DepGraph ctx, targets
-	print "Created dependancy graph" if verbose
+	_.verbose "Created dependancy graph"
 
 	-- and build
 	nparallel = parallel == true and Executor\getmaxparallel! or parallel
-	print "Building with #{nparallel} max parallel process#{nparallel>1 and "es" or ""}" if verbose
+	_.verbose "Building with #{nparallel} max parallel process#{nparallel>1 and "es" or ""}"
 	executor = Executor dag, nparallel
 	executor\execute opts
-	print "Finished" if verbose
+	_.verbose "Finished"
 
 table = {
 	:moonbuild, :_

out/moonbuild

@@ -6,9 +6,11 @@ do
   local _obj_0 = require('moonbuild')
   Context, DepGraph, Executor = _obj_0.Context, _obj_0.DepGraph, _obj_0.Executor
 end
-local Variable = (require('moonbuild'))['core.Variable']
+local Variable = require('moonbuild.core.Variable')
+local verbose
+verbose = require('moonbuild._common').verbose
 local parseargs
-parseargs = (require('moonbuild'))['_cmd.common'].parseargs
+parseargs = require('moonbuild._cmd.common').parseargs
 local argparse = require('argparse')
 local sort, concat
 do
@@ -55,14 +57,11 @@ args.parallel = args.parallel == 'y' and 'y' or ((tonumber(args.parallel)) or er
 if args.parallel ~= 'y' and (args.parallel < 1 or args.parallel % 1 ~= 0) then
   error("Invalid argument for -j: " .. tostring(args.parallel))
 end
-if args.verbose then
+verbose(args.verbose or false)
-  print("Parsed CLI args")
+verbose("Parsed CLI args")
-end
 local ctx = Context()
 ctx:load((loadfile(args.buildfile)), overrides)
-if args.verbose then
+verbose("Loaded buildfile")
-  print("Loaded buildfile")
-end
 if args.list then
   print("Public targets")
   local targets, n = { }, 1
@@ -94,20 +93,12 @@ if args.list_variables then
   exit(0)
 end
 ctx:init()
-if args.verbose then
+verbose("Initialized buildfile")
-  print("Initialized buildfile")
-end
 local targets = #args.targets == 0 and ctx.defaulttargets or args.targets
 local dag = DepGraph(ctx, targets)
-if args.verbose then
+verbose(print("Created dependancy graph"))
-  print("Created dependancy graph")
-end
 local nparallel = args.parallel == 'y' and Executor:getmaxparallel() or args.parallel
-if args.verbose then
+verbose("Building with " .. tostring(nparallel) .. " max parallel process" .. tostring(nparallel > 1 and "es" or ""))
-  print("Building with " .. tostring(nparallel) .. " max parallel process" .. tostring(nparallel > 1 and "es" or ""))
-end
 local executor = Executor(dag, nparallel)
 executor:execute(args)
-if args.verbose then
+return verbose("Finished")
-  return print("Finished")
-end

out/moonbuild.lua

@@ -1,5 +1,3 @@
-do
-
 do
 local _ENV = _ENV
 package.preload[ "moonbuild._" ] = function( ... ) local arg = _G.arg;
@@ -38,11 +36,13 @@ end
 do
 local _ENV = _ENV
 package.preload[ "moonbuild._cmd" ] = function( ... ) local arg = _G.arg;
-local parseargs, escape
+local parseargs, escape, cmdline
 do
   local _obj_0 = require('moonbuild._cmd.common')
-  parseargs, escape = _obj_0.parseargs, _obj_0.escape
+  parseargs, escape, cmdline = _obj_0.parseargs, _obj_0.escape, _obj_0.cmdline
 end
+local verbose
+verbose = require('moonbuild._common').verbose
 local ok, cmd, backend = false, nil, nil
 if not (ok) then
   ok, cmd = pcall(function()
@@ -69,6 +69,23 @@ end
 cmd.backend = backend
 cmd.parseargs = parseargs
 cmd.escape = escape
+local _list_0 = ({
+  'cmd',
+  'cmdrst'
+})
+for _index_0 = 1, #_list_0 do
+  local f = _list_0[_index_0]
+  local orig = cmd[f]
+  cmd[f] = function(...)
+    verbose("[" .. tostring(f) .. "] " .. tostring(cmdline(...)))
+    return orig(...)
+  end
+end
+local _sh = cmd.sh
+cmd.sh = function(cli)
+  verbose("[sh] " .. tostring(cli))
+  return _sh(cli)
+end
 local _cmd = cmd.cmd
 local _cmdrst = cmd.cmdrst
 cmd.cmdline = function(cmdline)
@@ -101,6 +118,8 @@ do
 end
 local concat
 concat = table.concat
+local flatten
+flatten = require('moonbuild._common').flatten
 local specialchars = {
   ['\"'] = '\\\"',
   ['\\'] = '\\\\',
@@ -232,26 +251,6 @@ parseargs = function(argstr)
   end
   return args
 end
-return {
-  escape = escape,
-  parseargs = parseargs
-}
-end
-end
-
-do
-local _ENV = _ENV
-package.preload[ "moonbuild._cmd.lua" ] = function( ... ) local arg = _G.arg;
-local escape
-escape = require('moonbuild._cmd.common').escape
-local flatten
-flatten = require('moonbuild._common').flatten
-local execute
-execute = require('moonbuild.compat.execute').execute
-local popen
-popen = io.popen
-local concat
-concat = table.concat
 local cmdline
 cmdline = function(...)
   return concat((function(...)
@@ -266,6 +265,27 @@ cmdline = function(...)
     return _accum_0
   end)(...), ' ')
 end
+return {
+  escape = escape,
+  parseargs = parseargs,
+  cmdline = cmdline
+}
+end
+end
+
+do
+local _ENV = _ENV
+package.preload[ "moonbuild._cmd.lua" ] = function( ... ) local arg = _G.arg;
+local cmdline
+cmdline = require('moonbuild._cmd.common').cmdline
+local flatten
+flatten = require('moonbuild._common').flatten
+local execute
+execute = require('moonbuild.compat.execute').execute
+local popen
+popen = io.popen
+local concat
+concat = table.concat
 local cmd
 cmd = function(...)
   local ok, ret, code = execute(cmdline(...))
@@ -285,6 +305,9 @@ cmdrst = function(...)
 end
 local sh
 sh = function(cli)
+  verbose(function()
+    return print('[sh] ' .. cli)
+  end)
   local ok, ret, code = execute(cli)
   if not (ok) then
     return error("command '" .. tostring(cli) .. "' exited with " .. tostring(code) .. " (" .. tostring(ret) .. ")")
@@ -356,6 +379,9 @@ cmdrst = function(...)
 end
 local sh
 sh = function(cli)
+  verbose(function()
+    return print('[sh] ' .. cli)
+  end)
   return cmd('sh', '-c', cli)
 end
 return {
@@ -637,6 +663,25 @@ minmax = function(list)
   end
   return m, M
 end
+local _verbose = false
+local verbose
+verbose = function(arg)
+  if arg == nil then
+    return _verbose
+  elseif (type(arg)) == 'function' then
+    if _verbose then
+      return arg()
+    end
+  elseif (type(arg)) == 'boolean' then
+    _verbose = arg
+  elseif (type(arg)) == 'string' then
+    if _verbose then
+      return print(arg)
+    end
+  else
+    return error("_.verbose takes either no argument, a boolean, a function or a string")
+  end
+end
 common.flatten = flatten
 common.first = first
 common.foreach = foreach
@@ -649,6 +694,7 @@ common.exclude = exclude
 common.min = min
 common.max = max
 common.minmax = minmax
+common.verbose = verbose
 return setmetatable(common, {
   __call = function(self)
     local _accum_0 = { }
@@ -973,14 +1019,27 @@ mkdir = function(dir)
 end
 local mkdirs
 mkdirs = function(dir)
-  if isdir(dir) then
+  do
+    local attr = attributes(normalizepath(dir))
+    if attr then
+      if attr.mode == 'directory' then
         return 
       end
-  if exists(dir) then
       error("Can't mkdirs " .. tostring(dir) .. ": file exists")
     end
+  end
   mkdirs(parent(dir))
-  return mkdir(dir)
+  if not (pcall(function()
+    return actualmkdir(dir)
+  end)) then
+    clearentry(parent(dir))
+    clearentry(dir)
+    if not (isdir(dir)) then
+      error("Failed to mkdirs " .. tostring(dir) .. ": last mkdir failed")
+    end
+  end
+  clearentry(parent(dir))
+  return clearentry(dir)
 end
 do
   local _tbl_0 = { }
@@ -1249,6 +1308,8 @@ do
   local _obj_0 = require('moonbuild._cmd')
   parseargs, cmdrst = _obj_0.parseargs, _obj_0.cmdrst
 end
+local verbose
+verbose = require('moonbuild._common').verbose
 local gmatch, match, gsub
 do
   local _obj_0 = string
@@ -1320,6 +1381,7 @@ writefile = function(filename, data)
 end
 local moonc
 moonc = function(infile, outfile)
+  verbose("[moonc] " .. tostring(infile) .. " " .. tostring(outfile))
   local code, err = to_lua(readfile(infile))
   if not (code) then
     error("Failed to compile " .. tostring(self.infile) .. ": " .. tostring(err))
@@ -1737,7 +1799,7 @@ do
       if self.nodes[name] then
         return 
       end
-      local elected = self:resolvedeps(name)
+      local elected = self:topresolvedeps(name)
       self.nodes[name] = elected
       local _list_0 = (transclosure(elected, 'deps'))
       for _index_0 = 1, #_list_0 do
@@ -1747,10 +1809,42 @@ do
       end
       elected.deps = nil
     end,
-    resolvedeps = function(self, name)
+    topresolvedeps = function(self, name)
+      local errors = { }
+      local ok, rst = pcall(function()
+        return self:resolvedeps(name, nil, errors)
+      end)
+      if ok then
+        return rst
+      else
+        local msg = {
+          "Failed to resolve target \'" .. tostring(name) .. "\'\n"
+        }
+        for _index_0 = 1, #errors do
+          local e = errors[_index_0]
+          if e.err:match('^moonbuild') then
+            e.err = e.err:match(': (.+)$')
+          end
+        end
+        for i = #errors, 1, -1 do
+          local e = errors[i]
+          insert(msg, tostring(string.rep('| ', e.level - 1)) .. "+-[" .. tostring(e.name) .. "] level " .. tostring(e.level) .. ": " .. tostring(e.err))
+        end
+        insert(msg, '')
+        return error(table.concat(msg, '\n'))
+      end
+    end,
+    resolvedeps = function(self, name, level, errors)
+      if level == nil then
+        level = 1
+      end
+      if errors == nil then
+        errors = { }
+      end
       do
         local node = self.nodes[name]
         if node then
+          print("deps(" .. tostring(name) .. ") = " .. tostring(node.name or '[noname]'))
           return node, { }
         end
       end
@@ -1764,7 +1858,7 @@ do
         return {
           a = {
             pcall(function()
-              return DepNode(self, candidate, name)
+              return DepNode(self, candidate, name, level, errors)
             end)
           }
         }
@@ -1775,7 +1869,16 @@ 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")
+      if not (resolved[1]) then
+        local err = "Cannot resolve target " .. tostring(name) .. ": " .. tostring(#candidates) .. " candidates, " .. tostring(#resolved) .. " resolved"
+        table.insert(errors, {
+          name = name,
+          level = level,
+          err = err
+        })
+        error(err)
+      end
+      return resolved[1]
     end,
     buildablenodes = function(self)
       local _accum_0 = { }
@@ -1904,7 +2007,7 @@ do
         return false
       end
       if not (quiet) then
-        print(tostring(self.type == 'virtual' and "Running" or "Building") .. " " .. tostring(self.name))
+        print(tostring(self.type == 'virtual' and "Running" or "Building") .. " " .. tostring(self.name) .. " [level " .. tostring(self.level) .. "]")
       end
       self:actuallybuild()
       return true
@@ -1986,8 +2089,8 @@ do
   }
   _base_0.__index = _base_0
   _class_0 = setmetatable({
-    __init = function(self, dag, target, name)
+    __init = function(self, dag, target, name, level, errors)
-      self.dag, self.name = dag, name
+      self.dag, self.name, self.level = dag, name, level
       self.priority = target.priority
       self.buildfunctions = target.buildfunctions
       self.mkdirs = target._mkdirs
@@ -2002,7 +2105,7 @@ do
       self.built = false
       local resolve
       resolve = function(name)
-        return self.dag:resolvedeps(patsubst(self.name, target.pattern, name))
+        return self.dag:resolvedeps((patsubst(self.name, target.pattern, name)), level + 1, errors)
       end
       local after = flatten(foreach(target.needtargets, resolve))
       local deps = flatten(foreach(target.infiles, resolve))
@@ -2107,6 +2210,123 @@ return DepGraph
 end
 end
 
+do
+local _ENV = _ENV
+package.preload[ "moonbuild.core.Pipeline" ] = function( ... ) local arg = _G.arg;
+local Target = require('moonbuild.core.Target')
+local _ = require('moonbuild._')
+local flatten, patsubst
+flatten, patsubst = _.flatten, _.patsubst
+local Pipeline
+do
+  local _class_0
+  local _base_0 = {
+    sources = function(self, ...)
+      self.lastsources = flatten(self.lastsources, ...)
+    end,
+    source = function(self, src)
+      self.lastsources = flatten(self.lastsources, src)
+    end,
+    step = function(self, name, params)
+      local public = true
+      if (type(name)) == 'table' then
+        public, params = false, name
+      end
+      local tgttype
+      if params.pattern then
+        if not ((type(params.pattern)) == 'table' and (type(params.pattern[1])) == 'string' and (type(params.pattern[2])) == 'string') then
+          error("pattern must be a table with the same format as patsubst")
+        end
+        tgttype = 'pattern'
+      elseif params.output or params.out then
+        if not ((type(params.output or params.out)) == 'string') then
+          error("output must be a string")
+        end
+        tgttype = 'single'
+      else
+        tgttype = error("invalid step type for pipeline: must be pattern or single (out/output)")
+      end
+      local tgtouts
+      local _exp_0 = tgttype
+      if 'pattern' == _exp_0 then
+        tgtouts = patsubst(self.lastsources, params.pattern[1], params.pattern[2])
+      elseif 'single' == _exp_0 then
+        tgtouts = params.output or params.out
+      end
+      local tgtpatt
+      local _exp_1 = tgttype
+      if 'pattern' == _exp_1 then
+        tgtpatt = params.pattern[2]
+      elseif 'single' == _exp_1 then
+        tgtpatt = nil
+      end
+      local tgtins
+      local _exp_2 = tgttype
+      if 'pattern' == _exp_2 then
+        tgtins = params.pattern[1]
+      elseif 'single' == _exp_2 then
+        tgtins = self.lastsources
+      end
+      local tgtprod
+      local _exp_3 = tgttype
+      if 'pattern' == _exp_3 then
+        tgtprod = params.pattern[2]
+      elseif 'single' == _exp_3 then
+        tgtprod = '%'
+      end
+      local tgt
+      do
+        local _with_0 = Target(self.ctx, tgtouts, {
+          pattern = tgtpatt
+        })
+        _with_0:depends(tgtins)
+        _with_0:produces(tgtprod)
+        _with_0:fn(params.fn or error("pipeline steps need a fn"))
+        tgt = _with_0
+      end
+      if params.mkdirs then
+        tgt:mkdirs()
+      end
+      if params.sync then
+        tgt:sync()
+      end
+      self.ctx:addtarget(tgt)
+      if public then
+        self.ctx:addtarget((function()
+          do
+            local _with_0 = Target(self.ctx, name)
+            _with_0:depends(tgtouts)
+            _with_0.public = true
+            return _with_0
+          end
+        end)())
+      end
+      self.lastsources = tgtouts
+    end
+  }
+  _base_0.__index = _base_0
+  _class_0 = setmetatable({
+    __init = function(self, ctx)
+      self.ctx = ctx
+      self.lastsources = { }
+    end,
+    __base = _base_0,
+    __name = "Pipeline"
+  }, {
+    __index = _base_0,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  Pipeline = _class_0
+  return _class_0
+end
+end
+end
+
 do
 local _ENV = _ENV
 package.preload[ "moonbuild.core.Target" ] = function( ... ) local arg = _G.arg;
@@ -2539,6 +2759,7 @@ local _ENV = _ENV
 package.preload[ "moonbuild.env.init" ] = function( ... ) local arg = _G.arg;
 local Target = require('moonbuild.core.Target')
 local Variable = require('moonbuild.core.Variable')
+local Pipeline = require('moonbuild.core.Pipeline')
 local _ = require('moonbuild._')
 local flatten
 flatten = _.flatten
@@ -2558,8 +2779,8 @@ return function(ctx)
   rawset(env, '_', _)
   rawset(env, '_G', env)
   rawset(env, '_ENV', env)
-  rawset(env, 'var', function(name, ...)
+  rawset(env, 'var', function(...)
-    local var = Variable(name, ...)
+    local var = Variable(...)
     ctx:addvar(var)
     rawset(varlayer, var.name, var.value)
     return var
@@ -2569,6 +2790,9 @@ return function(ctx)
     ctx:addtarget(target)
     return target
   end)
+  rawset(env, 'pipeline', function()
+    return Pipeline(ctx)
+  end)
   return env, varlayer
 end
 end
@@ -2616,8 +2840,6 @@ end
 end
 end
 
-end
-
 local loadfile
 loadfile = require('moonscript.base').loadfile
 local Context = require('moonbuild.context')
@@ -2659,29 +2881,20 @@ moonbuild = function(...)
   opts.force = force
   local verbose = opts.verbose or opts.v or false
   opts.verbose = verbose
+  _.verbose(verbose)
   local ctx = Context()
   ctx:load((loadfile(buildfile)), opts)
-  if verbose then
+  _.verbose("Loaded buildfile")
-    print("Loaded buildfile")
-  end
   ctx:init()
-  if verbose then
+  _.verbose("Initialized buildfile")
-    print("Initialized buildfile")
-  end
   local targets = #opts == 0 and ctx.defaulttargets or opts
   local dag = DepGraph(ctx, targets)
-  if verbose then
+  _.verbose("Created dependancy graph")
-    print("Created dependancy graph")
-  end
   local nparallel = parallel == true and Executor:getmaxparallel() or parallel
-  if verbose then
+  _.verbose("Building with " .. tostring(nparallel) .. " max parallel process" .. tostring(nparallel > 1 and "es" or ""))
-    print("Building with " .. tostring(nparallel) .. " max parallel process" .. tostring(nparallel > 1 and "es" or ""))
-  end
   local executor = Executor(dag, nparallel)
   executor:execute(opts)
-  if verbose then
+  return _.verbose("Finished")
-    return print("Finished")
-  end
 end
 local table = {
   moonbuild = moonbuild,

rock.yml

@@ -1,6 +1,6 @@
 package: moonbuild
 source:
-    url: git://github.com/natnat-mc/moonbuild
+    url: git+http://github.com/natnat-mc/moonbuild
 description:
     summary: Small build system in between make and a build.sh
     detailed: >

rockspecs/moonbuild-2.4.0-1.rockspec

@@ -0,0 +1,27 @@
+build = {
+  install = {
+    bin = {
+      moonbuild = "out/moonbuild"
+    }
+  },
+  modules = {
+    moonbuild = "out/moonbuild.lua"
+  },
+  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 = "v2.4.0",
+  url = "git://github.com/natnat-mc/moonbuild"
+}
+version = "2.4.0-1"

rockspecs/moonbuild-2.5.0-1.rockspec

@@ -0,0 +1,27 @@
+build = {
+  install = {
+    bin = {
+      moonbuild = "out/moonbuild"
+    }
+  },
+  modules = {
+    moonbuild = "out/moonbuild.lua"
+  },
+  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 = "v2.5.0",
+  url = "git://github.com/natnat-mc/moonbuild"
+}
+version = "2.5.0-1"

rockspecs/moonbuild-2.5.1-1.rockspec

@@ -0,0 +1,27 @@
+build = {
+  install = {
+    bin = {
+      moonbuild = "out/moonbuild"
+    }
+  },
+  modules = {
+    moonbuild = "out/moonbuild.lua"
+  },
+  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 = "v2.5.1",
+  url = "git://github.com/natnat-mc/moonbuild"
+}
+version = "2.5.1-1"

rockspecs/moonbuild-2.6.0-1.rockspec

@@ -0,0 +1,27 @@
+build = {
+  install = {
+    bin = {
+      moonbuild = "out/moonbuild"
+    }
+  },
+  modules = {
+    moonbuild = "out/moonbuild.lua"
+  },
+  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 = "v2.6.0",
+  url = "git+http://github.com/natnat-mc/moonbuild"
+}
+version = "2.6.0-1"

rockspecs/moonbuild-2.7.0-1.rockspec

@@ -0,0 +1,27 @@
+build = {
+  install = {
+    bin = {
+      moonbuild = "out/moonbuild"
+    }
+  },
+  modules = {
+    moonbuild = "out/moonbuild.lua"
+  },
+  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 = "v2.7.0",
+  url = "git+http://github.com/natnat-mc/moonbuild"
+}
+version = "2.7.0-1"

rockspecs/moonbuild-2.7.1-1.rockspec

@@ -0,0 +1,27 @@
+build = {
+  install = {
+    bin = {
+      moonbuild = "out/moonbuild"
+    }
+  },
+  modules = {
+    moonbuild = "out/moonbuild.lua"
+  },
+  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 = "v2.7.1",
+  url = "git+http://github.com/natnat-mc/moonbuild"
+}
+version = "2.7.1-1"