[PATCH] revert: add --stdin option to read commits from stdin

@@ -7,7 +7,8 @@ git-cherry-pick - Apply the changes introduced by some existing commits
 
 SYNOPSIS
 --------
-'git cherry-pick' [--edit] [-n] [-m parent-number] [-s] [-x] [--ff] <commit>...
+'git cherry-pick' [--edit] [-n] [-m parent-number] [-s] [-x] [--ff] [--stdin]
+		<commit>...
 
 DESCRIPTION
 -----------

@@ -79,6 +80,10 @@ effect to your index in a row.
 	cherry-pick'ed commit, then a fast forward to this commit will
 	be performed.
 
+--stdin::
+	In addition to the '<commit>' listed on the command
+	line, read them from the standard input.
+
 EXAMPLES
 --------
 git cherry-pick master::

@@ -113,6 +118,13 @@ git cherry-pick --ff ..next::
 	are in next but not HEAD to the current branch, creating a new
 	commit for each new change.
 
+git rev-list --reverse master -- README | git cherry-pick -n --stdin::
+
+	Apply the changes introduced by all commits on the master
+	branch that touched README to the working tree and index,
+	so the result can be inspected and made into a single new
+	commit if suitable.
+
 Author
 ------
 Written by Junio C Hamano <gitster@pobox.com>

@@ -7,7 +7,7 @@ git-revert - Revert some existing commits
 
 SYNOPSIS
 --------
-'git revert' [--edit | --no-edit] [-n] [-m parent-number] [-s] <commit>...
+'git revert' [--edit | --no-edit] [-n] [-m parent-number] [-s] [--stdin] <commit>...
 
 DESCRIPTION
 -----------

@@ -80,6 +80,10 @@ effect to your index in a row.
 --signoff::
 	Add Signed-off-by line at the end of the commit message.
 
+--stdin::
+	In addition to the '<commit>' listed on the command
+	line, read them from the standard input.
+
 EXAMPLES
 --------
 git revert HEAD~3::

@@ -41,7 +41,7 @@ static enum { REVERT, CHERRY_PICK } action;
 static struct commit *commit;
 static int commit_argc;
 static const char **commit_argv;
-static int allow_rerere_auto;
+static int allow_rerere_auto, read_stdin;
 
 static const char *me;
 static const char *strategy;

@@ -63,6 +63,7 @@ static void parse_args(int argc, const char **argv)
 		OPT_INTEGER('m', "mainline", &mainline, "parent number"),
 		OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
 		OPT_STRING(0, "strategy", &strategy, "strategy", "merge strategy"),
+		OPT_BOOLEAN(0, "stdin", &read_stdin, "read commits from stdin"),
 		OPT_END(),
 		OPT_END(),
 		OPT_END(),

@@ -79,7 +80,7 @@ static void parse_args(int argc, const char **argv)
 	}
 
 	commit_argc = parse_options(argc, argv, NULL, options, usage_str, 0);
-	if (commit_argc < 1)
+	if (commit_argc < 1 && !read_stdin)
 		usage_with_options(usage_str, options);
 
 	commit_argv = argv;

@@ -527,10 +528,12 @@ static void prepare_revs(struct rev_info *revs)
 {
 	int argc = 0;
 	int i;
-	const char **argv = xmalloc((commit_argc + 4) * sizeof(*argv));
+	const char **argv = xmalloc((commit_argc + 5) * sizeof(*argv));
 
 	argv[argc++] = NULL;
 	argv[argc++] = "--no-walk";
+	if (read_stdin)
+		argv[argc++] = "--stdin";
 	if (action != REVERT)
 		argv[argc++] = "--reverse";
 	for (i = 0; i < commit_argc; i++)

@@ -92,4 +92,14 @@ test_expect_failure 'cherry-pick -3 fourth works' '
 	test "$(git rev-parse --verify HEAD)" != "$(git rev-parse --verify fourth)"
 '
 
+test_expect_success 'cherry-pick --stdin works' '
+	git checkout master &&
+	git reset --hard first &&
+	test_tick &&
+	git rev-list --reverse first..fourth | git cherry-pick --stdin &&
+	git diff --quiet other &&
+	git diff --quiet HEAD other &&
+	test "$(git rev-parse --verify HEAD)" != "$(git rev-parse --verify fourth)"
+'
+
 test_done

@@ -23,7 +23,7 @@ test_expect_success setup '
 '
 
 test_expect_success 'cherry-pick first..fourth works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick first..fourth &&

@@ -33,7 +33,7 @@ test_expect_success 'cherry-pick first..fourth works' '
 '
 
 test_expect_success 'cherry-pick --ff first..fourth works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick --ff first..fourth &&

@@ -43,7 +43,7 @@ test_expect_success 'cherry-pick --ff first..fourth works' '
 '
 
 test_expect_success 'cherry-pick -n first..fourth works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick -n first..fourth &&

@@ -53,7 +53,7 @@ test_expect_success 'cherry-pick -n first..fourth works' '
 '
 
 test_expect_success 'revert first..fourth works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard fourth &&
 	test_tick &&
 	git revert first..fourth &&

@@ -63,7 +63,7 @@ test_expect_success 'revert first..fourth works' '
 '
 
 test_expect_success 'revert ^first fourth works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard fourth &&
 	test_tick &&
 	git revert ^first fourth &&

@@ -73,7 +73,7 @@ test_expect_success 'revert ^first fourth works' '
 '
 
 test_expect_success 'revert fourth fourth~1 fourth~2 works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard fourth &&
 	test_tick &&
 	git revert fourth fourth~1 fourth~2 &&

@@ -83,7 +83,7 @@ test_expect_success 'revert fourth fourth~1 fourth~2 works' '
 '
 
 test_expect_failure 'cherry-pick -3 fourth works' '
-	git checkout master &&
+	git checkout -f master &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick -3 fourth &&

@@ -113,6 +113,13 @@ git cherry-pick --ff ..next::
 	are in next but not HEAD to the current branch, creating a new
 	commit for each new change.
 
+git rev-list --reverse master -- README | git cherry-pick -n --stdin::
+
+	Apply the changes introduced by all commits on the master
+	branch that touched README to the working tree and index,
+	so the result can be inspected and made into a single new
+	commit if suitable.
+
 Author
 ------
 Written by Junio C Hamano <gitster@pobox.com>

@@ -78,7 +78,8 @@ static void parse_args(int argc, const char **argv)
 			die("program error");
 	}
 
-	commit_argc = parse_options(argc, argv, NULL, options, usage_str, 0);
+	commit_argc = parse_options(argc, argv, NULL, options, usage_str,
+	                            PARSE_OPT_KEEP_UNKNOWN);
 	if (commit_argc < 1)
 		usage_with_options(usage_str, options);
 

@@ -92,4 +92,14 @@ test_expect_failure 'cherry-pick -3 fourth works' '
 	test "$(git rev-parse --verify HEAD)" != "$(git rev-parse --verify fourth)"
 '
 
+test_expect_success 'cherry-pick --stdin works' '
+	git checkout -f master &&
+	git reset --hard first &&
+	test_tick &&
+	git rev-list --reverse first..fourth | git cherry-pick --stdin &&
+	git diff --quiet other &&
+	git diff --quiet HEAD other &&
+	test "$(git rev-parse --verify HEAD)" != "$(git rev-parse --verify fourth)"
+'
+
 test_done

@@ -50,10 +50,14 @@ static const char *strategy;
 
 static char *get_encoding(const char *message);
 
+static const char * const *revert_or_cherry_pick_usage(void)
+{
+	return action == REVERT ? revert_usage : cherry_pick_usage;
+}
+
 static void parse_args(int argc, const char **argv)
 {
-	const char * const * usage_str =
-		action == REVERT ?  revert_usage : cherry_pick_usage;
+	const char * const * usage_str = revert_or_cherry_pick_usage();
 	int noop;
 	struct option options[] = {
 		OPT_BOOLEAN('n', "no-commit", &no_commit, "don't automatically commit"),

@@ -79,8 +83,9 @@ static void parse_args(int argc, const char **argv)
 	}
 
 	commit_argc = parse_options(argc, argv, NULL, options, usage_str,
+	                            PARSE_OPT_KEEP_ARGV0 |
 	                            PARSE_OPT_KEEP_UNKNOWN);
-	if (commit_argc < 1)
+	if (commit_argc < 2)
 		usage_with_options(usage_str, options);
 
 	commit_argv = argv;

@@ -526,27 +531,22 @@ static int do_pick_commit(void)
 
 static void prepare_revs(struct rev_info *revs)
 {
-	int argc = 0;
-	int i;
-	const char **argv = xmalloc((commit_argc + 4) * sizeof(*argv));
-
-	argv[argc++] = NULL;
-	argv[argc++] = "--no-walk";
-	if (action != REVERT)
-		argv[argc++] = "--reverse";
-	for (i = 0; i < commit_argc; i++)
-		argv[argc++] = commit_argv[i];
-	argv[argc++] = NULL;
+	int argc;
 
 	init_revisions(revs, NULL);
-	setup_revisions(argc - 1, argv, revs, NULL);
+	revs->no_walk = 1;
+	if (action != REVERT)
+		revs->reverse = 1;
+
+	argc = setup_revisions(commit_argc, commit_argv, revs, NULL);
+	if (argc > 1)
+		usage(*revert_or_cherry_pick_usage());
+
 	if (prepare_revision_walk(revs))
 		die("revision walk setup failed");
 
 	if (!revs->commits)
 		die("empty commit set passed");
-
-	free(argv);
 }
 
 static int revert_or_cherry_pick(int argc, const char **argv)

@@ -41,6 +41,24 @@ test_expect_success setup '
 	git tag rename2
 '
 
+test_expect_success 'cherry-pick --nonsense' '
+
+	pos=$(git rev-parse HEAD) &&
+	git diff --exit-code HEAD &&
+	test_must_fail git cherry-pick --nonsense 2>msg &&
+	git diff --exit-code HEAD "$pos" &&
+	grep '[Uu]sage:' msg
+'
+
+test_expect_success 'revert --nonsense' '
+
+	pos=$(git rev-parse HEAD) &&
+	git diff --exit-code HEAD &&
+	test_must_fail git revert --nonsense 2>msg &&
+	git diff --exit-code HEAD "$pos" &&
+	grep '[Uu]sage:' msg
+'
+
 test_expect_success 'cherry-pick after renaming branch' '
 
 	git checkout rename2 &&