106 lines
2.8 KiB
Ruby
106 lines
2.8 KiB
Ruby
module Rscons
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class Environment
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# Values:
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# :none - do not print anything
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# :short - rscons will print a short representation of the step
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# being performed
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# :command (default) - print the full command being executed
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attr_accessor :echo
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# Hash of Builder Name => Builder Class
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attr_reader :builders
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def initialize(options = {})
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@echo = :command
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@variables = options.reject { |key, val| not key[0] =~ /[A-Z]/ }
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@builders = {}
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@build_dirs = {}
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unless @variables[:omit_default_builders]
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DEFAULT_BUILDERS.each do |builder_class|
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add_builder(builder_class)
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end
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end
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@echo = options[:echo] if options[:echo]
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end
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def add_builder(builder_class)
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@builders[builder_class.to_s.split(':').last] = builder_class
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var_defs = builder_class.default_variables(self)
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if var_defs
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var_defs.each_pair do |var, val|
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unless @variables.has_key?(var)
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@variables[var] = val
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end
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end
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end
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end
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def [](key)
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@variables[key]
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end
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def []=(key, val)
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@variables[key] = val
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end
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def build_dir(src_dir, build_dir)
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@build_dirs[src_dir] = build_dir
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end
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def execute(short_desc, command, extra_vars)
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merged_variables = @variables.merge(extra_vars)
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expand_varref = proc do |varref|
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if varref.is_a?(Array)
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varref.map do |ent|
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expand_varref.call(ent)
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end
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else
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if varref =~ /^(.*)\$\[(\w+)\](.*)$/
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# expand array with given prefix, suffix
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prefix, varname, suffix = $1, $2, $3
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varval = merged_variables[varname]
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unless varval.is_a?(Array)
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raise "Array expected for $#{varname}"
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end
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varval.map {|e| "#{prefix}#{e}#{suffix}"}
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elsif varref[0] == '$'
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# expand a single variable reference
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varname = varref[1, varref.size]
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varval = merged_variables[varname]
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if varval
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expand_varref.call(varval)
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else
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raise "Could not find variable #{varname.inspect}"
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end
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else
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varref
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end
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end
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end
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command = expand_varref.call(command.flatten).flatten
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if @echo == :command
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puts command.join(' ')
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elsif @echo == :short
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puts short_desc
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end
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system(*command)
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end
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def stem(fname)
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fname.sub(/\.[^.]*$/, '')
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end
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alias_method :orig_method_missing, :method_missing
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def method_missing(method, *args)
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if @builders.has_key?(method.to_s)
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# TODO: build sources if necessary
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builder = @builders[method.to_s].new
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builder.run(self, *args)
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else
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orig_method_missing(method, *args)
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end
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end
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end
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end
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