contrib/gcc-changelog/git_check_commit.py: Implement --num-commits

This patch implements a --num-commits (-n) flag for shorthand for
the range of hash~N..hash commits.

contrib/ChangeLog:

	* gcc-changelog/git_check_commit.py: Implement --num-commits.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
Reviewed-by: Jason Merrill <jason@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/contrib/gcc-changelog/git_check_commit.py b/contrib/gcc-changelog/git_check_commit.py
index 8cca9f4..22e032e 100755
--- a/contrib/gcc-changelog/git_check_commit.py
+++ b/contrib/gcc-changelog/git_check_commit.py
@@ -22,6 +22,12 @@ import argparse
 
 from git_repository import parse_git_revisions
 
+def nonzero_uint(value):
+    ivalue = int(value)
+    if ivalue <= 0:
+        raise argparse.ArgumentTypeError('%s is not a non-zero positive integer' % value)
+    return ivalue
+
 parser = argparse.ArgumentParser(description='Check git ChangeLog format '
                                  'of a commit')
 parser.add_argument('revisions', default='HEAD', nargs='?',
@@ -33,8 +39,17 @@ parser.add_argument('-p', '--print-changelog', action='store_true',
                     help='Print final changelog entires')
 parser.add_argument('-v', '--verbose', action='store_true',
                     help='Print verbose information')
+parser.add_argument('-n', '--num-commits', type=nonzero_uint, default=1,
+                    help='Number of commits to check (i.e. shorthand for '
+                    'hash~N..hash)')
 args = parser.parse_args()
 
+if args.num_commits > 1:
+    if '..' in args.revisions:
+        print('ERR: --num-commits and range of revisions are mutually exclusive')
+        exit(1)
+    args.revisions = '{0}~{1}..{0}'.format(args.revisions, args.num_commits)
+
 retval = 0
 for git_commit in parse_git_revisions(args.git_path, args.revisions):
     res = 'OK' if git_commit.success else 'FAILED'