Add support for python-style release logs

* releaselog.py: New option --list
* releaselog/__init__.py (ReleaseLog): New class method: formats
* releaselog/format/python.py: New source.

3 files changed, 26 insertions, 2 deletions

diff --git a/releaselog.py b/releaselog.py
index c8eeff3..c535a08 100644
--- a/releaselog.py
+++ b/releaselog.py
@@ -37,8 +37,19 @@ def main():
     parser.add_option('-u', '--url',
                       action="store_true", dest='url',
                       help='treat ARG as URL')
+    parser.add_option('-l', '--list',
+                      action="store_true", dest='list',
+                      help="list supported formats")
     (options, args) = parser.parse_args()
 
+    if options.list:
+        for f in ReleaseLogFile.formats():
+            if len(f) > 1:
+                print("%s; %s" % (f[0], ', '.join(f[1:])))
+            else:
+                print("%s" % f[0])
+        sys.exit(0)
+    
     if len(args) != 1:
         parser.error("bad number of arguments")
 
diff --git a/releaselog/__init__.py b/releaselog/__init__.py
index 7cb9c7d..e4a04c5 100644
--- a/releaselog/__init__.py
+++ b/releaselog/__init__.py
@@ -236,6 +236,19 @@ class ReleaseLog(object):
         else:
             cls.formatdb[fmt] = impl
 
+    @classmethod
+    def formats(cls):
+        """Return a list of supported release log formats. Each item in
+        the list is a list of alternative format names.
+        """
+        rev = {}
+        for fmt in cls.formatdb:
+            if cls.formatdb[fmt] not in rev:
+                rev[cls.formatdb[fmt]] = []
+            rev[cls.formatdb[fmt]].append(fmt)
+        return rev.values()
+                
+        
 # Initialize the ReleaseLog implementations
 import pkgutil
 import importlib
diff --git a/releaselog/format/python.py b/releaselog/format/python.py
index 7c2a218..bdcdea6 100644
--- a/releaselog/format/python.py
+++ b/releaselog/format/python.py
@@ -15,8 +15,8 @@ may follow.
 
     <Version> (<Date>)
 
-followed by the description text. This format is used, among others, by
-GNU Texinfo.
+followed by the description text. Incidentally, this format is used by some
+non-Python software, such as e.g. GNU Texinfo.
 
 The PythonLogFormat class discovers the actual format by finding the first
 input line that matches any of the above patterns.