Add script to bump build numbers.

// FREEBIE

Scripts/bump_build_number.py

@@ -0,0 +1,81 @@
+#!/usr/bin/env python
+import sys
+import os
+import re
+import commands
+import subprocess
+
+def fail(message):
+    print message
+    sys.exit(1)
+
+def find_project_root():
+    path = os.path.abspath(os.curdir)
+    
+    while True:
+        # print 'path', path
+        if not os.path.exists(path):
+            break
+        git_path = os.path.join(path, '.git')
+        if os.path.exists(git_path):
+            return path
+        new_path = os.path.abspath(os.path.dirname(path))
+        if not new_path or new_path == path:
+            break
+        path = new_path
+    
+    fail('Could not find project root path')
+
+if __name__ == '__main__':
+    project_root_path = find_project_root()
+    # print 'project_root_path', project_root_path
+    plist_path = os.path.join(project_root_path, 'Signal', 'Signal-Info.plist')
+    if not os.path.exists(plist_path):
+        fail('Could not find .plist')
+        
+    output = subprocess.check_output(['git', 'status', '--porcelain'])
+    if len(output.strip()) > 0:
+        print output
+        fail('Git repository has untracked files.')
+    output = subprocess.check_output(['git', 'diff', '--shortstat'])
+    if len(output.strip()) > 0:
+        print output
+        fail('Git repository has untracked files.')
+    
+    # Ensure .plist is in xml format, not binary.
+    output = subprocess.check_output(['plutil', '-convert', 'xml1', plist_path])
+    # print 'output', output
+    
+    with open(plist_path, 'rt') as f:
+        text = f.read()
+    # print 'text', text
+
+    # <key>CFBundleVersion</key>
+    # <string>2.13.0.13</string>
+    file_regex = re.compile(r'<key>CFBundleVersion</key>\s*<string>([\d\.]+)</string>', re.MULTILINE)
+    file_match = file_regex.search(text)
+    # print 'match', match
+    if not file_match:   
+        fail('Could not parse .plist')
+    
+    old_build_number = file_match.group(1)
+    print 'old_build_number:', old_build_number
+    
+    build_number_regex = re.compile(r'\.(\d+)$')
+    build_number_match = build_number_regex.search(old_build_number)
+    if not build_number_match:   
+        fail('Could not parse .plist version')
+    
+    build_number = build_number_match.group(1)
+    build_number = str(1 + int(build_number))
+    new_build_number = old_build_number[:build_number_match.start(1)] + build_number
+    print 'new_build_number:', new_build_number
+    
+    text = text[:file_match.start(1)] + new_build_number + text[file_match.end(1):]
+    with open(plist_path, 'wt') as f:
+        f.write(text)
+        
+    output = subprocess.check_output(['git', 'add', '.'])
+    output = subprocess.check_output(['git', 'commit', '-m', 'Bump build from to %s.\n\n// FREEBIE' % new_build_number])
+    
+