coffee, file-include, watch (could be resolved an unexpected react)

gulpfile2.coffee

gulp = require('gulp')
fileinclude = require('gulp-file-include')
coffee = require('gulp-coffee')
runSequence = require('run-sequence')

app = 'app'

paths =
  fileinclude:
    in  : ["#{app}/**/*.coffee", "!#{app}/.tmp"]
    out : "#{app}/.tmp"
  coffee:
    in  : ["#{app}/.tmp/*.coffee"]
    out : 'public/dist'

gulp.task 'fileinclude', ->
  gulp.src paths.fileinclude.in
    .pipe fileinclude
      prefix: '@@'
      basepath: '@file'
    .pipe gulp.dest paths.fileinclude.out

gulp.task 'coffee', ['fileinclude'], ->
  gulp.src paths.coffee.in
    .pipe coffee()
    .pipe gulp.dest paths.coffee.out

# watching..
# vi foo.coffee
# (detect!) foo.coffee, bar.coffee -> concated.coffee
# (detect!) concated.coffee <- !?
gulp.task 'watch', ['build'], ->
  s = false 
  gulp.watch "#{app}/**/*"
      .on 'change', (e) ->
        unless s
          console.log "changed #{e.path}"
          s = true
          runSequence 'coffee', -> s = false

gulp.task 'build', ['coffee']

gulp.task 'default', ['watch']