From 90a1a99169521df9de2b1bfc3c129402ee1158fc Mon Sep 17 00:00:00 2001
From: Guido Günther <agx@sigxcpu.org>
Date: Mon, 27 Nov 2017 19:59:32 +0100
Subject: ChangeLog: add class method to create empty changelogs

---
 gbp/deb/changelog.py           | 18 ++++++++++++++++++
 tests/30_test_deb_changelog.py | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/gbp/deb/changelog.py b/gbp/deb/changelog.py
index 1d7bc47e..e7e03257 100644
--- a/gbp/deb/changelog.py
+++ b/gbp/deb/changelog.py
@@ -272,6 +272,10 @@ class ChangeLog(object):
             args.append("--distribution=%s" % distribution)
 
         args.extend(dch_options or [])
+
+        if '--create' in args:
+            env['EDITOR'] = env['VISUAL'] = '/bin/true'
+
         args.append('--')
         if msg:
             args.append('[[[insert-git-dch-commit-message-here]]]')
@@ -344,3 +348,17 @@ class ChangeLog(object):
 
         name, mail = email.utils.parseaddr(_quote(maintainer or ''))
         return (_unquote(name), _unquote(mail))
+
+    @classmethod
+    def create(cls, package=None, version=None):
+        """
+        Create a new, empty changelog
+        """
+        dch_options = ['--create']
+        if package:
+            dch_options.extend(['--package', package])
+        if version:
+            dch_options.extend(['--newversion', version])
+
+        cls.spawn_dch(dch_options=dch_options)
+        return cls(filename='debian/changelog')
diff --git a/tests/30_test_deb_changelog.py b/tests/30_test_deb_changelog.py
index 8587a675..339864e0 100644
--- a/tests/30_test_deb_changelog.py
+++ b/tests/30_test_deb_changelog.py
@@ -7,9 +7,12 @@ Test things here that don't fit nicely into the doctests that
 also make up the API documentation.
 """
 
+from . import context  # noqa: 401
+import os
 import unittest
 
 from gbp.deb.changelog import ChangeLog
+from gbp.command_wrappers import CommandExecFailed
 
 
 class TestQuoting(unittest.TestCase):
@@ -24,3 +27,39 @@ class TestQuoting(unittest.TestCase):
         cl = ChangeLog(changes)
         self.assertEquals(cl.author, 'Guido Günther, aftercomma')
         self.assertEquals(cl.email, 'agx@sigxcpu.org')
+
+
+class Test(unittest.TestCase):
+    def setUp(self):
+        self.tmpdir = context.new_tmpdir(__name__)
+        context.chdir(self.tmpdir)
+        os.mkdir('debian/')
+
+    def tearDown(self):
+        context.teardown()
+
+    def test_changelog_creation_full(self):
+        cp = ChangeLog.create('package', '1.0')
+        self.assertEquals(cp.name, 'package')
+        self.assertEquals(cp.version, '1.0')
+
+    def test_changelog_creation_version(self):
+        cp = ChangeLog.create(version='1.0')
+        self.assertEquals(cp.name, 'PACKAGE')
+        self.assertEquals(cp.version, '1.0')
+
+    def test_changelog_creation_package(self):
+        cp = ChangeLog.create(package='package')
+        self.assertEquals(cp.name, 'package')
+        self.assertEquals(cp.version, 'unknown')
+
+    def test_changelog_missing_dir(self):
+        os.rmdir('debian/')
+        with self.assertRaisesRegexp(CommandExecFailed, "Cannot find debian directory"):
+            ChangeLog.create('package', '1.0')
+
+    def test_changelog_exists(self):
+        with open('debian/changelog', 'w') as f:
+            f.write('')
+        with self.assertRaisesRegexp(CommandExecFailed, "File debian/changelog already exists"):
+            ChangeLog.create('package', '1.0')
-- 
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