releasenotes: raise error on simultaneous usage of flags

The releasenotes command is supposed to raise an error when --list and
--rev/--check flags are used together. This patch adds the above functionality.

Differential Revision: https://phab.mercurial-scm.org/D831

hgext/releasenotes.py

@@ -552,7 +552,15 b' def releasenotes(ui, repo, file_=None, *'
     release note after it has been added to the release notes file.
     """
     sections = releasenotessections(ui, repo)
-    if opts.get('list'):
+
+    listflag = opts.get('list')
+
+    if listflag and opts.get('rev'):
+        raise error.Abort(_('cannot use both \'--list\' and \'--rev\''))
+    if listflag and opts.get('check'):
+        raise error.Abort(_('cannot use both \'--list\' and \'--check\''))
+
+    if listflag:
         return _getadmonitionlist(ui, sections)
 
     rev = opts.get('rev')

tests/test-releasenotes-formatting.t

@@ -420,3 +420,17 b' Usage of --list flag'
   fix: Bug Fixes
   perf: Performance Improvements
   api: API Changes
+
+  $ cd ..
+
+Raise error on simultaneous usage of flags
+
+  $ hg init relnotes-raise-error
+  $ cd relnotes-raise-error
+  $ hg releasenotes -r . -l
+  abort: cannot use both '--list' and '--rev'
+  [255]
+
+  $ hg releasenotes -l -c
+  abort: cannot use both '--list' and '--check'
+  [255]