make.py

#!/usr/bin/env python

import json
from os import unlink
from glob import glob
from shutil import copytree, rmtree
from os.path import join, isdir

from configure import config, processed_p, shoreline_300

def clean():
  if isdir("build"):
    rmtree("build")

  for f in glob("build/*.html"): unlink(f)

def build():
  #copy the osm-bright tree to a build dir
  copytree("osm-bright", "build")

  #remove the mml templates
  for f in glob("build/*.mml"):
    unlink(f)

  #load the project template
  templatefile = open(join('osm-bright', 'osm-bright.%s.mml' % config["importer"]))
  template = json.loads(templatefile.read())

  #fill in the project template
  for layer in template["Layer"]:
    if layer["id"] == "shoreline_300":
      layer["Datasource"]["file"] = shoreline_300
    elif layer["id"] in ("processed_p", "processed_p_outline"):
      layer["Datasource"]["file"] = processed_p
    else:
      # Assume all other layers are PostGIS layers
      for opt, val in config["postgis"].iteritems():
        if (val == ""):
          if (opt in layer["Datasource"]):
            del layer["Datasource"][opt]
        else:
          layer["Datasource"][opt] = val

  #dump the filled-in project template to the build dir
  with open(join('build', 'project.mml'), 'w') as output:
    output.write(json.dumps(template, sort_keys=True, indent=2))

if __name__ == "__main__":
  clean()
  build()