🚧 Utility to extract configuration into a new config file

Fixes: #63
Signed-off-by: Guyzmo <[email protected]>

Author: guyzmo

README.md

@@ -186,6 +186,20 @@ So you can run the tool as a git subcommand:
 
     git hub clone guyzmo/git-repo
 
+For those who like to keep all dotfiles in a git repository, it'd be horrendous to
+store tokens that offer access to your social accounts in a repository… And I'm not
+even talking about those who want to share your dotfiles. But don't worry, once
+it's all configured, you can fire up your [favorite editor](http://www.vim.org) and
+move all the `[gitrepo …]` sections into a new file, like `~/.gitconfig-repos`.
+
+Your can run the following command to do this automagically:
+
+    python -m git_repo.extract_config
+
+if you want to use another path, you can change the defaults:
+
+    python -m git_repo.extract_config ~/.gitconfig-repos ~/.gitconfig
+
 ### Development
 
 For development, I like to use `buildout`, and the repository is already configured

git_repo/extract_config.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import git
+
+def extract_gitrepo_sections(conf):
+    return filter(lambda k: k.startswith('gitrepo'), conf.sections())
+
+def extract_gitrepo_conf(gconf_old, gconf_new):
+    if os.path.exists(gconf_new):
+        return "✗ cannot execute, file already exists: {}".format(gconf_new)
+    with git.config.GitConfigParser(gconf_old, read_only=False) as cold:
+        with git.config.GitConfigParser(gconf_new, read_only=False) as cnew:
+            sections = list(extract_gitrepo_sections(cold))
+            # copy the sections to the new configuration file
+            cnew.update({s: {k:v for k,v in cold.items(s)} for s in sections})
+            cnew.write()
+            # remove the sections from the old configuration file
+            for section in sections:
+                cold.remove_section(section)
+            # insert path to the new config file in the old one
+            cold.update({'include': {'path': os.path.abspath(gconf_new)}})
+    print("🍻 git-repo configuration extracted to new file: {}".format(gconf_new))
+
+if __name__ == '__main__':
+    if '-h' in sys.argv or '--help' in sys.argv:
+        sys.exit('Usage: {} [.gitconfig-repos] [.gitconfig]'.format(sys.argv[0]))
+    sys.exit(extract_gitrepo_conf(
+        gconf_old=os.path.expanduser(len(sys.argv) >= 3 and sys.argv[2] or '~/.gitconfig'),
+        gconf_new=os.path.expanduser(len(sys.argv) >= 2 and sys.argv[1] or '~/.gitconfig-repos')
+    ))
+
+