[PATCHv3 0/4] Add commit message options for rebase --autosquash

[PATCHv3 0/4] Add commit message options for rebase --autosquash

[Pat Notz]

This patch series adds new command line options to git-commit to make
it easy to specify messages for commits correctly formatted for use
wit 'rebase -i --autosquash'.

The 2nd iteration addressed concerns raised earlier:
http://thread.gmane.org/gmane.comp.version-control.git/156369 .  Most
notably, --squash=COMMIT now works with -m/-c/-C/-F and uses the
editor when appropriate.

This 3rd iteration adds documentation links from --squash and --fixup
to git-rebase(1) and updates the tests to conform to established style
(editor script moved into t7500/ directory).

Pat Notz (4):
  commit: --fixup option for use with rebase --autosquash
  t7500: add tests of commit --fixup
  commit: --squash option for use with rebase --autosquash
  t7500: add tests of commit --squash

 Documentation/git-commit.txt |   21 +++++++++--
 builtin/commit.c             |   58 +++++++++++++++++++++++++++---
 t/t7500-commit.sh            |   80 ++++++++++++++++++++++++++++++++++++++++++
 t/t7500/edit-content         |    4 ++
 4 files changed, 154 insertions(+), 9 deletions(-)
 create mode 100755 t/t7500/edit-content

-- 
1.7.3

[PATCHv3 1/4] commit: --fixup option for use with rebase --autosquash

[Pat Notz]

This option makes it convenient to construct commit messages for use
with 'rebase --autosquash'.  The resulting commit message will be
"fixup! ..." where "..." is the subject line of the specified commit
message.

Example usage:
  $ git commit --fixup HEAD~2

Signed-off-by: Pat Notz <patnotz@gmail.com>
---
 Documentation/git-commit.txt |   14 ++++++++++----
 builtin/commit.c             |   23 +++++++++++++++++++----
 2 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index 42fb1f5..f4a2b8c 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -9,10 +9,10 @@ SYNOPSIS
 --------
 [verse]
 'git commit' [-a | --interactive] [-s] [-v] [-u<mode>] [--amend] [--dry-run]
-	   [(-c | -C) <commit>] [-F <file> | -m <msg>] [--reset-author]
-	   [--allow-empty] [--allow-empty-message] [--no-verify] [-e] [--author=<author>]
-	   [--date=<date>] [--cleanup=<mode>] [--status | --no-status] [--]
-	   [[-i | -o ]<file>...]
+	   [(-c | -C | --fixup) <commit>] [-F <file> | -m <msg>]
+	   [--reset-author] [--allow-empty] [--allow-empty-message] [--no-verify]
+	   [-e] [--author=<author>] [--date=<date>] [--cleanup=<mode>]
+	   [--status | --no-status] [--] [[-i | -o ]<file>...]
 
 DESCRIPTION
 -----------
@@ -70,6 +70,12 @@ OPTIONS
 	Like '-C', but with '-c' the editor is invoked, so that
 	the user can further edit the commit message.
 
+--fixup=<commit>::
+	Construct a commit message for use with `rebase --autosquash`.
+	The commit message will be the subject line from the specified
+	commit with a prefix of "fixup! ".  See linkgit:git-rebase[1]
+	for details.
+
 --reset-author::
 	When used with -C/-c/--amend options, declare that the
 	authorship of the resulting commit now belongs of the committer.
diff --git a/builtin/commit.c b/builtin/commit.c
index 66fdd22..0901616 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -69,6 +69,7 @@ static enum {
 static const char *logfile, *force_author;
 static const char *template_file;
 static char *edit_message, *use_message;
+static char *fixup_message;
 static char *author_name, *author_email, *author_date;
 static int all, edit_flag, also, interactive, only, amend, signoff;
 static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
@@ -124,6 +125,7 @@ static struct option builtin_commit_options[] = {
 	OPT_CALLBACK('m', "message", &message, "MESSAGE", "specify commit message", opt_parse_m),
 	OPT_STRING('c', "reedit-message", &edit_message, "COMMIT", "reuse and edit message from specified commit"),
 	OPT_STRING('C', "reuse-message", &use_message, "COMMIT", "reuse message from specified commit"),
+	OPT_STRING(0, "fixup", &fixup_message, "COMMIT", "use autosquash formatted message to fixup specified commit"),
 	OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C-c/--amend)"),
 	OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 	OPT_FILENAME('t', "template", &template_file, "use specified template file"),
@@ -586,6 +588,17 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 		strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 		hook_arg1 = "commit";
 		hook_arg2 = use_message;
+	} else if (fixup_message) {
+		unsigned char sha1[20];
+		struct commit *commit;
+		struct pretty_print_context ctx = {0};
+		if (get_sha1(fixup_message, sha1))
+			die("could not lookup commit %s", fixup_message);
+		commit = lookup_commit_reference(sha1);
+		if (!commit || parse_commit(commit))
+			die("could not parse commit %s", fixup_message);
+		format_commit_message(commit, "fixup! %s\n\n", &sb, &ctx);
+		hook_arg1 = "message";
 	} else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
 		if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
 			die_errno("could not read MERGE_MSG");
@@ -863,7 +876,7 @@ static int parse_and_validate_options(int argc, const char *argv[],
 	if (force_author && renew_authorship)
 		die("Using both --reset-author and --author does not make sense");
 
-	if (logfile || message.len || use_message)
+	if (logfile || message.len || use_message || fixup_message)
 		use_editor = 0;
 	if (edit_flag)
 		use_editor = 1;
@@ -883,15 +896,17 @@ static int parse_and_validate_options(int argc, const char *argv[],
 		f++;
 	if (edit_message)
 		f++;
+	if (fixup_message)
+		f++;
 	if (logfile)
 		f++;
 	if (f > 1)
-		die("Only one of -c/-C/-F can be used.");
+		die("Only one of -c/-C/-F/--fixup can be used.");
 	if (message.len && f > 0)
-		die("Option -m cannot be combined with -c/-C/-F.");
+		die("Option -m cannot be combined with -c/-C/-F/--fixup.");
 	if (edit_message)
 		use_message = edit_message;
-	if (amend && !use_message)
+	if (amend && !use_message && !fixup_message)
 		use_message = "HEAD";
 	if (!use_message && renew_authorship)
 		die("--reset-author can be used only with -C, -c or --amend.");
-- 
1.7.3

[PATCHv3 2/4] t7500: add tests of commit --fixup

[Pat Notz]

Signed-off-by: Pat Notz <patnotz@gmail.com>
---
 t/t7500-commit.sh |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/t/t7500-commit.sh b/t/t7500-commit.sh
index aa9c577..7656ed4 100755
--- a/t/t7500-commit.sh
+++ b/t/t7500-commit.sh
@@ -215,4 +215,37 @@ test_expect_success 'Commit a message with --allow-empty-message' '
 	commit_msg_is "hello there"
 '
 
+commit_for_rebase_autosquash_setup() {
+	echo "first content for testing commit messages for rebase --autosquash" >>foo &&
+	git add foo &&
+	cat >log <<EOF
+target message subject line
+
+target message body line 1
+target message body line 2
+EOF
+	git commit -F log &&
+	echo "second content for testing commit messages for rebase --autosquash" >>foo &&
+	git add foo &&
+	git commit -m "intermediate commit" &&
+	echo "third content for testing commit messages for rebase --autosquash" >>foo &&
+	git add foo
+}
+
+test_expect_success 'commit --fixup provides correct one-line commit message' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --fixup HEAD~1 &&
+	commit_msg_is "fixup! target message subject line"
+'
+
+test_expect_success 'invalid message options when using --fixup' '
+	echo changes >>foo &&
+	echo "message" >log &&
+	git add foo &&
+	test_must_fail git commit --fixup HEAD~1 --C HEAD~2 &&
+	test_must_fail git commit --fixup HEAD~1 --c HEAD~2 &&
+	test_must_fail git commit --fixup HEAD~1 -m "cmdline message" &&
+	test_must_fail git commit --fixup HEAD~1 -F log
+'
+
 test_done
-- 
1.7.3

[PATCHv3 3/4] commit: --squash option for use with rebase --autosquash

[Pat Notz]

This option makes it convenient to construct commit messages for use
with 'rebase --autosquash'.  The resulting commit message will be
"squash! ..." where "..." is the subject line of the specified commit
message.  This option can be used with other commit message options
such as -m, -c, -C and -F.

If an editor is invoked (as with -c or -eF or no message options) the
commit message is seeded with the correctly formatted subject line.

Example usage:
  $ git commit --squash HEAD~2
  $ git commit --squash HEAD~2 -m "clever comment"
  $ git commit --squash HEAD~2 -F msgfile
  $ git commit --squash HEAD~2 -C deadbeef

Signed-off-by: Pat Notz <patnotz@gmail.com>
---
 Documentation/git-commit.txt |    9 ++++++++-
 builtin/commit.c             |   37 +++++++++++++++++++++++++++++++++++--
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index f4a2b8c..6e4c220 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -9,7 +9,7 @@ SYNOPSIS
 --------
 [verse]
 'git commit' [-a | --interactive] [-s] [-v] [-u<mode>] [--amend] [--dry-run]
-	   [(-c | -C | --fixup) <commit>] [-F <file> | -m <msg>]
+	   [(-c | -C | --fixup | --squash) <commit>] [-F <file> | -m <msg>]
 	   [--reset-author] [--allow-empty] [--allow-empty-message] [--no-verify]
 	   [-e] [--author=<author>] [--date=<date>] [--cleanup=<mode>]
 	   [--status | --no-status] [--] [[-i | -o ]<file>...]
@@ -76,6 +76,13 @@ OPTIONS
 	commit with a prefix of "fixup! ".  See linkgit:git-rebase[1]
 	for details.
 
+--squash=<commit>::
+	Construct a commit message for use with `rebase --autosquash`.
+	The commit message subject line is taken from the specified
+	commit with a prefix of "squash! ".  Can be used with additional
+	commit message options (`-m`/`-c`/`-C`/`-F`). See
+	linkgit:git-rebase[1] for details.
+
 --reset-author::
 	When used with -C/-c/--amend options, declare that the
 	authorship of the resulting commit now belongs of the committer.
diff --git a/builtin/commit.c b/builtin/commit.c
index 0901616..d28b2ff 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -69,7 +69,7 @@ static enum {
 static const char *logfile, *force_author;
 static const char *template_file;
 static char *edit_message, *use_message;
-static char *fixup_message;
+static char *fixup_message, *squash_message;
 static char *author_name, *author_email, *author_date;
 static int all, edit_flag, also, interactive, only, amend, signoff;
 static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
@@ -126,6 +126,7 @@ static struct option builtin_commit_options[] = {
 	OPT_STRING('c', "reedit-message", &edit_message, "COMMIT", "reuse and edit message from specified commit"),
 	OPT_STRING('C', "reuse-message", &use_message, "COMMIT", "reuse message from specified commit"),
 	OPT_STRING(0, "fixup", &fixup_message, "COMMIT", "use autosquash formatted message to fixup specified commit"),
+	OPT_STRING(0, "squash", &squash_message, "COMMIT", "use autosquash formatted message to squash specified commit"),
 	OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C-c/--amend)"),
 	OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 	OPT_FILENAME('t', "template", &template_file, "use specified template file"),
@@ -567,6 +568,27 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 	if (!no_verify && run_hook(index_file, "pre-commit", NULL))
 		return 0;
 
+	if (squash_message) {
+		/*
+		 * Insert the proper subject line before other commit
+		 * message options add their content.
+		 */
+		unsigned char sha1[20];
+		struct commit *commit;
+		struct pretty_print_context ctx = {0};
+
+		if (get_sha1(squash_message, sha1))
+			die("could not lookup commit %s", squash_message);
+		commit = lookup_commit_reference(sha1);
+		if (!commit || parse_commit(commit))
+			die("could not parse commit %s", squash_message);
+
+		if(use_message && strcmp(use_message, squash_message) == 0)
+			strbuf_addstr(&sb,"squash! ");
+		else
+			format_commit_message(commit, "squash! %s\n\n", &sb, &ctx);
+	}
+
 	if (message.len) {
 		strbuf_addbuf(&sb, &message);
 		hook_arg1 = "message";
@@ -620,6 +642,16 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 	else if (in_merge)
 		hook_arg1 = "merge";
 
+	if (squash_message) {
+		/*
+		 * If squash_commit was used for the commit subject,
+		 * then we're possibly hijacking other commit log options.
+		 * Reset the hook args to tell the real story.
+		 */
+		hook_arg1 = "message";
+		hook_arg2 = "";
+	}
+
 	fp = fopen(git_path(commit_editmsg), "w");
 	if (fp == NULL)
 		die_errno("could not open '%s'", git_path(commit_editmsg));
@@ -891,7 +923,8 @@ static int parse_and_validate_options(int argc, const char *argv[],
 		die("You have nothing to amend.");
 	if (amend && in_merge)
 		die("You are in the middle of a merge -- cannot amend.");
-
+	if (fixup_message && squash_message)
+		die("Options --squash and --fixup cannot be used together");
 	if (use_message)
 		f++;
 	if (edit_message)
-- 
1.7.3

[PATCHv3 4/4] t7500: add tests of commit --squash

[Pat Notz]

Signed-off-by: Pat Notz <patnotz@gmail.com>
---
 t/t7500-commit.sh    |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 t/t7500/edit-content |    4 ++++
 2 files changed, 51 insertions(+), 0 deletions(-)
 create mode 100755 t/t7500/edit-content

diff --git a/t/t7500-commit.sh b/t/t7500-commit.sh
index 7656ed4..0f746d5 100755
--- a/t/t7500-commit.sh
+++ b/t/t7500-commit.sh
@@ -238,10 +238,57 @@ test_expect_success 'commit --fixup provides correct one-line commit message' '
 	commit_msg_is "fixup! target message subject line"
 '
 
+test_expect_success 'commit --squash works with -F' '
+	commit_for_rebase_autosquash_setup &&
+	echo "log message from file" >msgfile
+	git commit --squash HEAD~1 -F msgfile  &&
+	commit_msg_is "squash! target message subject linelog message from file"
+'
+
+test_expect_success 'commit --squash works with -m' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --squash HEAD~1 -m "foo bar\nbaz" &&
+	commit_msg_is "squash! target message subject linefoo bar\nbaz"
+'
+
+test_expect_success 'commit --squash works with -C' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --squash HEAD~1 -C HEAD &&
+	commit_msg_is "squash! target message subject lineintermediate commit"
+'
+
+test_expect_success 'commit --squash works with -c' '
+	commit_for_rebase_autosquash_setup &&
+	test_set_editor "$TEST_DIRECTORY"/t7500/edit-content &&
+	git commit --squash HEAD~1 -c HEAD &&
+	commit_msg_is "squash! target message subject lineedited commit"
+'
+
+test_expect_success 'commit --squash works with -C for same commit' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --squash HEAD -C HEAD &&
+	commit_msg_is "squash! intermediate commit"
+'
+
+test_expect_success 'commit --squash works with -c for same commit' '
+	commit_for_rebase_autosquash_setup &&
+	test_set_editor "$TEST_DIRECTORY"/t7500/edit-content &&
+	git commit --squash HEAD -c HEAD &&
+	commit_msg_is "squash! edited commit"
+'
+
+test_expect_success 'commit --squash works with editor' '
+	commit_for_rebase_autosquash_setup &&
+	test_set_editor "$TEST_DIRECTORY"/t7500/add-content &&
+	git commit --squash HEAD~1 &&
+	commit_msg_is "squash! target message subject linecommit message"
+'
+
 test_expect_success 'invalid message options when using --fixup' '
 	echo changes >>foo &&
 	echo "message" >log &&
 	git add foo &&
+	test_must_fail git commit --fixup HEAD~1 --squash HEAD~2 &&
 	test_must_fail git commit --fixup HEAD~1 --C HEAD~2 &&
 	test_must_fail git commit --fixup HEAD~1 --c HEAD~2 &&
 	test_must_fail git commit --fixup HEAD~1 -m "cmdline message" &&
diff --git a/t/t7500/edit-content b/t/t7500/edit-content
new file mode 100755
index 0000000..08db9fd
--- /dev/null
+++ b/t/t7500/edit-content
@@ -0,0 +1,4 @@
+#!/bin/sh
+sed -e "s/intermediate/edited/g" <"$1" >"$1-"
+mv "$1-" "$1"
+exit 0
-- 
1.7.3

Re: [PATCHv3 2/4] t7500: add tests of commit --fixup

[Ævar Arnfjörð Bjarmason]

On Thu, Sep 23, 2010 at 16:23, Pat Notz <patnotz@gmail.com> wrote:

> +commit_for_rebase_autosquash_setup() {
> +       echo "first content for testing commit messages for rebase --autosquash" >>foo &&
> +       git add foo &&
> +       cat >log <<EOF

Missing &&

Re: [PATCHv3 4/4] t7500: add tests of commit --squash

[Ævar Arnfjörð Bjarmason]

On Thu, Sep 23, 2010 at 16:23, Pat Notz <patnotz@gmail.com> wrote:

> +test_expect_success 'commit --squash works with -F' '
> +       commit_for_rebase_autosquash_setup &&
> +       echo "log message from file" >msgfile

Missing &&

Re: [PATCHv3 4/4] t7500: add tests of commit --squash

[Pat Notz]

On Thu, Sep 23, 2010 at 10:34 AM, Ævar Arnfjörð Bjarmason
<avarab@gmail.com> wrote:
> On Thu, Sep 23, 2010 at 16:23, Pat Notz <patnotz@gmail.com> wrote:
>
>> +test_expect_success 'commit --squash works with -F' '
>> +       commit_for_rebase_autosquash_setup &&
>> +       echo "log message from file" >msgfile
>
> Missing &&
>

Wow, great eyes (on both tests).  v4 shortly.