[meld] maint: Check that we're on a release branch before pulling

[Kai Willadsen <kaiw src gnome org>]

commit 2235becb57678c2d19fe316c62ea249c412841f2
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Fri Aug 22 08:09:39 2014 +1000

    maint: Check that we're on a release branch before pulling

 maint.py |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/maint.py b/maint.py
index eb9a102..9bf901f 100755
--- a/maint.py
+++ b/maint.py
@@ -3,6 +3,7 @@
 import collections
 import datetime
 import os
+import re
 import subprocess
 
 import click
@@ -12,6 +13,7 @@ import meld.conf
 
 PO_DIR = "po"
 HELP_DIR = "help"
+RELEASE_BRANCH_RE = r'%s-\d+-\d+' % meld.conf.__package__
 
 NEWS_TEMPLATE = """
 {{ [date, app, version]|join(' ') }}
@@ -228,6 +230,16 @@ def call_with_output(cmd, stdin_text=None, echo_stdout=True):
         click.secho('\n' + stderr.decode('utf-8'), fg='red')
 
 
+def check_release_branch():
+    cmd = ['git', 'rev-parse', '--abbrev-ref', 'HEAD']
+    branch = subprocess.check_output(cmd).strip().decode('utf-8')
+    if branch != 'master' and not re.match(RELEASE_BRANCH_RE, branch):
+        click.echo(
+            '\nBranch "%s" doesn\'t appear to be a release branch.\n' % branch)
+        click.confirm('Are you sure you wish to continue?', abort=True)
+    return branch
+
+
 @click.group()
 def cli():
     pass
@@ -252,6 +264,11 @@ def markdown():
 
 
 @cli.command()
+def pull():
+    branch = check_release_branch()
+
+
+ cli command()
 def dist():
     archive = '%s-%s.tar.bz2' % (meld.conf.__package__, meld.conf.__version__)
     dist_archive_path = os.path.abspath(os.path.join('dist', archive))