ruby - Flexible Rake task -


i use following rake task multiple directories. , each directory need different constants defined. how can handle , stay dry?

namespace :assets   ext     = 'js'   objdir  = 'public/javascripts'   libfile = "#{objdir}/packaged.#{ext}"   src     = filelist["#{objdir}/*.#{ext}"].select {|file| !file.match(/\.min\.#{ext}|packaged\.#{ext}/)}   obj     = src.collect {|fn| file.join(objdir, file.basename(fn).ext("min.#{ext}"))}   mine    = %w(4sq app fb mbp).collect {|x| x + ".#{ext}"}    desc "build #{libfile}"   task :build => libfile    desc "remove minified files"   task :clean     rm_f obj   end          desc "remove #{libfile}"   task :clobber     rm_f libfile   end    file libfile => obj     sh "cat #{obj} >> #{libfile}"   end    rule ".min.#{ext}" => lambda{ |objfile| find_source(objfile) } |t|     if ext == 'js'       if mine.include?(file.basename(t.source))         sh "closure --js #{t.source} --js_output_file #{t.name}"       else         sh "closure --warning_level quiet --third_party --js #{t.source} --js_output_file #{t.name}"       end     elsif ext == 'css'       sh "yuicompressor #{t.source} -o #{t.name}"     end   end    def find_source(objfile)     base = file.basename(objfile, ".min.#{ext}")     src.find {|s| file.basename(s, ".#{ext}") == base}   end end

first must replace constants variables. next problem set variables. task can variables.

example:

namespace :assets |x1,x2|   task :doit, :ext, :objdir |tsk, args|     puts tsk     p args   end end

you can call with:

  rake assets:doit[js,objdir]

result:

assets:doit called {:ext=>"js", :objdir=>"objdir"}

if want avoid set variables each of task, may add 'set' task:

namespace :assets2 |x1,x2|   task :set, :ext, :objdir |tsk, args|     @args = args     puts "#{tsk} set: #{@args.inspect}"   end   task :doit |tsk|     puts "#{tsk} called #{@args.inspect}"   end end

call: rake assets2:set[js,objdir] assets2:doit

result:

assets2:set set: {:ext=>"js", :objdir=>"objdir"} assets2:doit called {:ext=>"js", :objdir=>"objdir"}

instead of setting parameters, may define configuration file.

there 1 disadvantage. following task not work:

rake assets:doit[js,objdir] assets:doit[c,objdir2]

assets:doit called once. second call ignored, task executed. there no check different parameters (one solution this: perhaps reset task)

edit: found , tested 'reset'-method: need add tsk.reenable

namespace :assets |x1,x2|   task :doit, :ext, :objdir |tsk, args|     puts "#{tsk} called #{args.inspect}"     tsk.reenable   end end

another problem: if parameters contains spaces. may trouble.

============== code generic generation of rule: (see comments)

namespace :assets3 |x1,x2|   task :set, :ext, :objdir |tsk, args|     @args = args     @src =   filelist["*.rb"]      puts "#{tsk} set: #{@args.inspect}"      #define rule, when extension set.     rule ".min.#{@args[:ext]}" => lambda{ |objfile| find_source(objfile) } |t|       puts "#{t} called #{@args.inspect}"     end    end    task :doit |tsk|     puts "#{tsk} called #{@args.inspect}"   end    def find_source(objfile)     base = file.basename(objfile, ".min.#{@args[:ext]}")     #if nothing found, rake abort 'can't convert nil string (typeerror)'     #if return '' in case, 'don't know how build task 'test.min.js' (runtimeerror)'     @src.find {|s| file.basename(s, ".#{@args[:ext]}") == base} || ''   end  end

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