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obie/source_maps.rb

Forked from alexspeller/source_maps.rb
Last active December 15, 2015 10:39
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  1. obie revised this gist Mar 26, 2013. 1 changed file with 20 additions and 67 deletions.
    87 changes: 20 additions & 67 deletions source_maps.rb
    View file
    Original file line number Diff line number Diff line change
    @@ -1,29 +1,9 @@
    # config/initializers/source_maps.rb

    if Rails.env.development?
    require 'open3'
    module CoffeeScript
    class SourceMapError < StandardError; end;

    class << self

    def map_dir
    return @map_dir if @map_dir
    # Make the directory the maps are served from
    @map_dir = Rails.root.join("public/source_maps")
    @map_dir.mkpath
    @map_dir
    end

    def check_coffeescript_version
    version = `coffee --version`

    unless version.match(/(\d+)\.\d+\./)[1].to_i >= 2
    raise "You must have coffeescript version 2.0.0-dev or higher to use source maps - see http://ryanflorence.com/2012/coffeescript-source-maps/"
    end
    end


    def compile script, options
    script = script.read if script.respond_to?(:read)

    @@ -32,59 +12,32 @@ def compile script, options
    else
    options[:bare] = false
    end

    check_coffeescript_version
    compile_with_source_map script, options
    end

    def compile_with_source_map script, options
    flags = %w(--js)
    flags << "--bare" if options[:bare]

    javascript, stderr, status = Open3.capture3("coffee #{flags.join(' ')}", stdin_data: script)
    # adding source mapss option. (source maps option requires filename option.)
    options[:sourceMap] = true
    options[:filename] = options[:pathname].basename.to_s

    raise SourceMapError, stderr unless status.success?
    ret = Source.context.call("CoffeeScript.compile", script, options)

    source_map_comment = generate_source_map options[:pathname], script if options[:pathname]
    map_dir = Rails.root.join("public/source_maps")
    map_dir.mkpath

    return javascript << source_map_comment
    basename = options[:pathname].basename('.coffee')
    map_file = map_dir.join "#{basename}.map"
    coffee_file = map_dir.join "#{basename}.coffee"

    # patch the generated source map with the otherwise missing filename
    source_map = JSON.load(ret["v3SourceMap"])
    source_map["sources"][0] = options[:filename]

    rescue SourceMapError => e
    message = e.message.lines.first.chomp.gsub('"', '\"')
    relative_path_name = options[:pathname].to_s.gsub(Rails.root.to_s, '') if options[:pathname]
    relative_path_name ||= '<unknown path>'
    %Q{throw Error("Coffeescript compile error: #{relative_path_name}: #{message}")}
    end


    def generate_source_map pathname, script
    basename = pathname.basename('.coffee')
    coffee_file = map_dir.join("#{basename}.coffee")
    coffee_file.open('w') {|f| f.puts script }
    map_file.open('w') {|f| f.puts source_map.to_json }


    # This command actually generates the source map, and saves it to a file
    source_map, status = nil
    Dir.chdir Rails.root.join('public/source_maps').to_s do
    source_map, stderr, status = Open3.capture3("coffee --source-map -i #{pathname.basename}")
    end
    comment = "//@ sourceMappingURL=/source_maps/#{map_file.basename}\n"
    return comment + ret["js"]

    raise SourceMapError, "Error while generating source map for file #{pathname}: #{stderr}" unless status.success?

    # I couldn't figure out how to control the 'file' and 'sources' values in the output,
    # so parse the map to JSON and rewrite these to ones that will work here
    data = JSON.parse(source_map)
    data['file'] = pathname.basename.to_s.gsub(/\.coffee/, '')
    data['sources'] = [pathname.basename.to_s]


    map_file = map_dir.join "#{basename}.map"
    map_file.open('w') { |f| f.puts data.to_json }
    Rails.logger.info "Compiled source map #{map_file}"

    return "\n//@ sourceMappingURL=/source_maps/#{map_file.basename}\n"
    end

    end
    end

    @@ -96,8 +49,8 @@ def generate_source_map pathname, script
    module Tilt
    class CoffeeScriptTemplate < Template
    def evaluate(scope, locals, &block)
    @output ||= CoffeeScript.compile(data, options.merge(pathname: scope.pathname))
    @output ||= CoffeeScript.compile(data, options.merge(:pathname => scope.pathname))
    end
    end
    end
    end
    end
  2. @alexspeller alexspeller created this gist Sep 16, 2012.
    103 changes: 103 additions & 0 deletions source_maps.rb
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,103 @@
    # config/initializers/source_maps.rb

    if Rails.env.development?
    require 'open3'
    module CoffeeScript
    class SourceMapError < StandardError; end;

    class << self

    def map_dir
    return @map_dir if @map_dir
    # Make the directory the maps are served from
    @map_dir = Rails.root.join("public/source_maps")
    @map_dir.mkpath
    @map_dir
    end

    def check_coffeescript_version
    version = `coffee --version`

    unless version.match(/(\d+)\.\d+\./)[1].to_i >= 2
    raise "You must have coffeescript version 2.0.0-dev or higher to use source maps - see http://ryanflorence.com/2012/coffeescript-source-maps/"
    end
    end


    def compile script, options
    script = script.read if script.respond_to?(:read)

    if options.key?(:no_wrap) and !options.key?(:bare)
    options[:bare] = options[:no_wrap]
    else
    options[:bare] = false
    end

    check_coffeescript_version
    compile_with_source_map script, options
    end

    def compile_with_source_map script, options
    flags = %w(--js)
    flags << "--bare" if options[:bare]

    javascript, stderr, status = Open3.capture3("coffee #{flags.join(' ')}", stdin_data: script)

    raise SourceMapError, stderr unless status.success?

    source_map_comment = generate_source_map options[:pathname], script if options[:pathname]

    return javascript << source_map_comment

    rescue SourceMapError => e
    message = e.message.lines.first.chomp.gsub('"', '\"')
    relative_path_name = options[:pathname].to_s.gsub(Rails.root.to_s, '') if options[:pathname]
    relative_path_name ||= '<unknown path>'
    %Q{throw Error("Coffeescript compile error: #{relative_path_name}: #{message}")}
    end


    def generate_source_map pathname, script
    basename = pathname.basename('.coffee')
    coffee_file = map_dir.join("#{basename}.coffee")
    coffee_file.open('w') {|f| f.puts script }


    # This command actually generates the source map, and saves it to a file
    source_map, status = nil
    Dir.chdir Rails.root.join('public/source_maps').to_s do
    source_map, stderr, status = Open3.capture3("coffee --source-map -i #{pathname.basename}")
    end

    raise SourceMapError, "Error while generating source map for file #{pathname}: #{stderr}" unless status.success?

    # I couldn't figure out how to control the 'file' and 'sources' values in the output,
    # so parse the map to JSON and rewrite these to ones that will work here
    data = JSON.parse(source_map)
    data['file'] = pathname.basename.to_s.gsub(/\.coffee/, '')
    data['sources'] = [pathname.basename.to_s]


    map_file = map_dir.join "#{basename}.map"
    map_file.open('w') { |f| f.puts data.to_json }
    Rails.logger.info "Compiled source map #{map_file}"

    return "\n//@ sourceMappingURL=/source_maps/#{map_file.basename}\n"
    end

    end
    end



    # Monkeypatch this method to include the scripts' pathname
    require 'tilt/template'

    module Tilt
    class CoffeeScriptTemplate < Template
    def evaluate(scope, locals, &block)
    @output ||= CoffeeScript.compile(data, options.merge(pathname: scope.pathname))
    end
    end
    end
    end