Packager refactoring, moved common packager code into separate module

packager.py

Index: packager.py
===================================================================
new file mode 100644
--- /dev/null
+++ b/packager.py
@@ -0,0 +1,67 @@
+# coding: utf-8
+
+# This file is part of the Adblock Plus build tools,
+# Copyright (C) 2006-2012 Eyeo GmbH
+#
+# Adblock Plus is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# Adblock Plus is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+
+# Note: These are the base functions common to all packagers, the actual
+# packagers are implemented in packagerGecko and packagerChrome.
+
+import os, re, codecs, subprocess, json, jinja2
+import buildtools
+from ConfigParser import SafeConfigParser
+
+def getDefaultFileName(baseDir, metadata, version, ext):
+  return os.path.join(baseDir, '%s-%s.%s' % (metadata.get('general', 'basename'), version, ext))
+
+def getMetadataPath(baseDir):
+  return os.path.join(baseDir, 'metadata')
+
+def readMetadata(baseDir):
+  metadata = SafeConfigParser()
+  metadata.optionxform = str
+  file = codecs.open(getMetadataPath(baseDir), 'rb', encoding='utf-8')
+  metadata.readfp(file)
+  file.close()
+  return metadata
+
+def getBuildNum(baseDir):
+  try:
+    (result, dummy) = subprocess.Popen(['hg', 'id', '-R', baseDir, '-n'], stdout=subprocess.PIPE).communicate()
+    return re.sub(r'\D', '', result)
+  except Exception:
+    return '0'
+
+def getBuildVersion(baseDir, metadata, releaseBuild, buildNum=None):
+  version = metadata.get('general', 'version')
+  if not releaseBuild:
+    if buildNum == None:
+      buildNum = getBuildNum(baseDir)
+    if len(buildNum) > 0:
+      if re.search(r'(^|\.)\d+$', version):
+        # Numerical version number - need to fill up with zeros to have three
+        # version components.
+        while version.count('.') < 2:
+          version += '.0'
+      version += '.' + buildNum
+  return version
+
+def getTemplate(template, autoEscape=False):
+  templatePath = buildtools.__path__[0]
+  if autoEscape:
+    env = jinja2.Environment(loader=jinja2.FileSystemLoader(templatePath), autoescape=True, extensions=['jinja2.ext.autoescape'])
+  else:
+    env = jinja2.Environment(loader=jinja2.FileSystemLoader(templatePath))
+  env.filters.update({'json': json.dumps})
+  return env.get_template(template)