[Scons-users] Build results of a scanner function?

[Justin Tulloss]

Hello,

This is a newbie question, so hopefully it's straightforward to answer. I'm
using scons to build my web frontend. I have a list of .less files that I
want to compile to .css files. These less files are listed in a manifest
file. I have a scanner that reads the manifest file and returns the files
listed. As I understand it, this makes them implicit dependencies of the
target. How do I indicate that I want my .less builder to run against all
of these source files?

Here's the important bits of code for context:

def build_target(target, source, env):
  # unimportant stuff
  return None

def scan_target(node, env, path):
  js_env = environment.Environment('rdio')
  # This actually finds all the less files.
  files = js_env.less_app_bundle()
  return files

# I want this to find the less files given a .json file (which is the
manifest)
target_scanner = Scanner(
  name='LessScan',
  function=scan_target,
  skeys=['.json'])

target_builder = Builder(
  action=build_target,
  source_scanner=target_scanner)

less_builder = Builder(
  generator=lambda source, target, env, for_signature: \
    '%s --include-path=%s -x $SOURCE > $TARGET' % (lessc, web_root),
  suffix='.css',
  source_scanner=target_scanner)

env = Environment()
env.Append(BUILDERS={
  'Target': target_builder,
  'Less': less_builder,
})

env.Target(['targets/rdio.json'])

What I want is the results of the scan_target function to be read one by
one into the less_builder function. How would I do something like that?

Thanks a lot for your help!

Justin
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