gistfile1.txt

#!/usr/bin/env python
"""Update of new names in source code after massive file rename onto a Git repository.

This script considers: 

- The script is located at the root of the Git repository
- The head of the branch where the files were renamed is checkout
- This branch as a common ancestor with the master
- This common ancestor is used for the diff

"""
import os, git
from termcolor import colored
from shutil import copyfile

MASTER_BRANCH = 'master'
RENAME_BRANCH = 'rework/files_renaming'

def ls_files(tree):
    """List the files into a Git repository."""
    files = []    
    def _recurse_tree(tree):
        for item in tree:
            if item.type == 'blob' and item.mime_type == 'text/plain':
                files.append(os.path.join(tree.abspath, item.name))
            elif item.type == 'tree':
                _recurse_tree(item)
    _recurse_tree(tree)
    return sorted(files)
    
def get_branch(repo, branch):
    """Get a branch by its name."""
    return repo.heads[{v.name:i for i,v in enumerate(repo.heads)}[branch]]

# Get the rename branch
repo = git.Repo(search_parent_directories=True)
rename_branch = get_branch(repo, RENAME_BRANCH)
    
# Find common ancestor between the two branches
for commit in get_branch(repo, MASTER_BRANCH).commit.iter_parents():
    if not commit in rename_branch.commit.iter_parents(): break
   
# Identify the renamed files and list the changelist
changes = []
for diff in commit.diff(rename_branch):
    if not diff.renamed_file: continue
    changes.append((os.path.basename(diff.rename_from), os.path.basename(diff.rename_to)))
   
# Do rename any occurences of the change list into all the repository files
for f in ls_files(repo.tree()):
    copyfile(f, f + '.bak')
    print "Processing %s ..." % f,
    with open(f, 'wb') as dst:
        with open(f + '.bak', 'rb') as src:  
            content = src.read()           
            for a, b in changes:
                content = content.replace(bytes(a), bytes(b))                
            dst.write(content)     
    os.unlink(f + '.bak')
    print colored(' done', 'green')