javascript - Dynamic file mapping with relative destination -

this generic question dynamic file mapping grunt.js, example purpose, i'll trying build coffee files in project dynamic structure :

here, can have multiple (dynamic) target folders different depth. finding coffee files remain easy, match **/coffee/*.coffee anytime.

what i'm trying achieve, making dest property relative matched coffee file :

• find **/coffee/*.coffee
• compile ../js/*.js

instead of making relative project folder (gruntfile).

coffee: {     compile: {         files: [             {               expand: true,               src: ['**/coffee/*.coffee'],               dest: '../js/', // won't work ! wish :)               ext: '.js'             }         ]     } } 

how achieve ?

i don't think that's idea. sounds each target should perhaps repository of own. if ignore that, you'll have other problems, such difficulty telling target , non-target folders apart. example, current pattern potentially match coffeescript files in node_modules/ directory.

i find weird targets have differing folder structures (i.e. coffee/ , js/ not on same level). again, sounds they're different projects, , should have own repos.

that being said, if really, have that, there few ways accomplish this.

first, "normal" way specify multiple targets manually. i'll using gruntfile.coffee syntax here:

coffee:   target1:     expand: true     cwd: 'target1/coffee'     src: '**/*.coffee'     dest: 'target1/js'     ext: '.js'   targetx:     expand: true     cwd: 'targetx/some-folder/coffee'     src: '**/*.coffee'     dest: 'targetx/some-folder/js'     ext: '.js' 

however if you're need have dynamic targets, , don't mind blacklisting unwanted folders, perhaps try this:

coffee: ->   targets = {}   target in grunt.file.expand '**/coffee', '!node_modules/**'     targets[target.split('/', 1)[0]] =       expand: true       cwd: target       src: '**/*.coffee'       dest: target + '/../js'       ext: '.js'   targets 

this same previous snippet, added uncertainty. perhaps rid of blacklist having targets/ folder contain targets, , using targets/**/coffee pattern.

alternatively use grunt.file.expandmapping:

coffee:   compile:     files: grunt.file.expandmapping ['**/coffee/**/*.coffee', '!node_modules/**'], '',       expand: true       ext: '.js'       rename: (base, src) ->         src.replace '/coffee/', '/js/' 

while may kind of simple (and ugly), it's slowest option , feels wrong.

so there. it's possible, not want.