Merge branch 'ra/rebase-i-more-options'

"git rebase -i" learned a few options that are known by "git
rebase" proper.

* ra/rebase-i-more-options:
  rebase -i: finishing touches to --reset-author-date
  rebase: add --reset-author-date
  rebase -i: support --ignore-date
  sequencer: rename amend_author to author_to_rename
  rebase -i: support --committer-date-is-author-date
  sequencer: allow callers of read_author_script() to ignore fields
  rebase -i: add --ignore-whitespace flag

1 files changed, 133 insertions, 8 deletions

diff --git a/sequencer.c b/sequencer.c
index 35d996cbd0..8a51c9042b 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -147,6 +147,8 @@ static GIT_PATH_FUNC(rebase_path_refs_to_delete, "rebase-merge/refs-to-delete")
  * command-line.
  */
 static GIT_PATH_FUNC(rebase_path_gpg_sign_opt, "rebase-merge/gpg_sign_opt")
+static GIT_PATH_FUNC(rebase_path_cdate_is_adate, "rebase-merge/cdate_is_adate")
+static GIT_PATH_FUNC(rebase_path_ignore_date, "rebase-merge/ignore_date")
 static GIT_PATH_FUNC(rebase_path_orig_head, "rebase-merge/orig-head")
 static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
 static GIT_PATH_FUNC(rebase_path_quiet, "rebase-merge/quiet")
@@ -823,9 +825,19 @@ int read_author_script(const char *path, char **name, char **email, char **date,
 		error(_("missing 'GIT_AUTHOR_DATE'"));
 	if (date_i < 0 || email_i < 0 || date_i < 0 || err)
 		goto finish;
-	*name = kv.items[name_i].util;
-	*email = kv.items[email_i].util;
-	*date = kv.items[date_i].util;
+
+	if (name)
+		*name = kv.items[name_i].util;
+	else
+		free(kv.items[name_i].util);
+	if (email)
+		*email = kv.items[email_i].util;
+	else
+		free(kv.items[email_i].util);
+	if (date)
+		*date = kv.items[date_i].util;
+	else
+		free(kv.items[date_i].util);
 	retval = 0;
 finish:
 	string_list_clear(&kv, !!retval);
@@ -868,6 +880,47 @@ static char *get_author(const char *message)
 	return NULL;
 }
 
+/* Returns a "date" string that needs to be free()'d by the caller */
+static char *read_author_date_or_null(void)
+{
+	char *date;
+
+	if (read_author_script(rebase_path_author_script(),
+			       NULL, NULL, &date, 0))
+		return NULL;
+	return date;
+}
+
+/* Construct a free()able author string with current time as the author date */
+static char *ignore_author_date(const char *author)
+{
+	int len = strlen(author);
+	struct ident_split ident;
+	struct strbuf new_author = STRBUF_INIT;
+
+	if (split_ident_line(&ident, author, len) < 0) {
+		error(_("malformed ident line"));
+		return NULL;
+	}
+	len = ident.mail_end - ident.name_begin + 1;
+
+	strbuf_addf(&new_author, "%.*s ", len, ident.name_begin);
+	datestamp(&new_author);
+	return strbuf_detach(&new_author, NULL);
+}
+
+static void push_dates(struct child_process *child, int change_committer_date)
+{
+	time_t now = time(NULL);
+	struct strbuf date = STRBUF_INIT;
+
+	strbuf_addf(&date, "@%"PRIuMAX, (uintmax_t)now);
+	argv_array_pushf(&child->env_array, "GIT_AUTHOR_DATE=%s", date.buf);
+	if (change_committer_date)
+		argv_array_pushf(&child->env_array, "GIT_COMMITTER_DATE=%s", date.buf);
+	strbuf_release(&date);
+}
+
 static const char staged_changes_advice[] =
 N_("you have staged changes in your working tree\n"
 "If these changes are meant to be squashed into the previous commit, run:\n"
@@ -927,6 +980,25 @@ static int run_git_commit(struct repository *r,
 
 	cmd.git_cmd = 1;
 
+	if (opts->committer_date_is_author_date) {
+		int res = -1;
+		struct strbuf datebuf = STRBUF_INIT;
+		char *date = read_author_date_or_null();
+
+		if (!date)
+			return -1;
+
+		strbuf_addf(&datebuf, "@%s", date);
+		res = setenv("GIT_COMMITTER_DATE",
+			     opts->ignore_date ? "" : datebuf.buf, 1);
+
+		strbuf_release(&datebuf);
+		free(date);
+
+		if (res)
+			return -1;
+	}
+
 	if (is_rebase_i(opts) && read_env_script(&cmd.env_array)) {
 		const char *gpg_opt = gpg_sign_opt_quoted(opts);
 
@@ -942,6 +1014,8 @@ static int run_git_commit(struct repository *r,
 		argv_array_push(&cmd.args, "--amend");
 	if (opts->gpg_sign)
 		argv_array_pushf(&cmd.args, "-S%s", opts->gpg_sign);
+	if (opts->ignore_date)
+		push_dates(&cmd, opts->committer_date_is_author_date);
 	if (defmsg)
 		argv_array_pushl(&cmd.args, "-F", defmsg, NULL);
 	else if (!(flags & EDIT_MSG))
@@ -1310,14 +1384,13 @@ static int try_to_commit(struct repository *r,
 	struct commit_extra_header *extra = NULL;
 	struct strbuf err = STRBUF_INIT;
 	struct strbuf commit_msg = STRBUF_INIT;
-	char *amend_author = NULL;
+	char *author_to_free = NULL;
 	const char *hook_commit = NULL;
 	enum commit_msg_cleanup_mode cleanup;
 	int res = 0;
 
 	if (parse_head(r, &current_head))
 		return -1;
-
 	if (flags & AMEND_MSG) {
 		const char *exclude_gpgsig[] = { "gpgsig", NULL };
 		const char *out_enc = get_commit_output_encoding();
@@ -1332,7 +1405,7 @@ static int try_to_commit(struct repository *r,
 			strbuf_addstr(msg, orig_message);
 			hook_commit = "HEAD";
 		}
-		author = amend_author = get_author(message);
+		author = author_to_free = get_author(message);
 		unuse_commit_buffer(current_head, message);
 		if (!author) {
 			res = error(_("unable to parse commit author"));
@@ -1345,6 +1418,31 @@ static int try_to_commit(struct repository *r,
 		commit_list_insert(current_head, &parents);
 	}
 
+	if (opts->committer_date_is_author_date) {
+		int len = strlen(author);
+		struct ident_split ident;
+		struct strbuf date = STRBUF_INIT;
+
+		if (split_ident_line(&ident, author, len) < 0) {
+			res = error(_("malformed ident line"));
+			goto out;
+		}
+		if (!ident.date_begin) {
+			res = error(_("corrupted author without date information"));
+			goto out;
+		}
+
+		strbuf_addf(&date, "@%.*s %.*s",
+			    (int)(ident.date_end - ident.date_begin), ident.date_begin,
+			    (int)(ident.tz_end - ident.tz_begin), ident.tz_begin);
+		res = setenv("GIT_COMMITTER_DATE",
+			     opts->ignore_date ? "" : date.buf, 1);
+		strbuf_release(&date);
+
+		if (res)
+			goto out;
+	}
+
 	if (write_index_as_tree(&tree, r->index, r->index_file, 0, NULL)) {
 		res = error(_("git write-tree failed to write a tree"));
 		goto out;
@@ -1404,6 +1502,15 @@ static int try_to_commit(struct repository *r,
 
 	reset_ident_date();
 
+	if (opts->ignore_date) {
+		author = ignore_author_date(author);
+		if (!author) {
+			res = -1;
+			goto out;
+		}
+		free(author_to_free);
+		author_to_free = (char *)author;
+	}
 	if (commit_tree_extended(msg->buf, msg->len, &tree, parents,
 				 oid, author, opts->gpg_sign, extra)) {
 		res = error(_("failed to write commit object"));
@@ -1424,7 +1531,7 @@ out:
 	free_commit_extra_headers(extra);
 	strbuf_release(&err);
 	strbuf_release(&commit_msg);
-	free(amend_author);
+	free(author_to_free);
 
 	return res;
 }
@@ -2485,6 +2592,16 @@ static int read_populate_opts(struct replay_opts *opts)
 			opts->signoff = 1;
 		}
 
+		if (file_exists(rebase_path_cdate_is_adate())) {
+			opts->allow_ff = 0;
+			opts->committer_date_is_author_date = 1;
+		}
+
+		if (file_exists(rebase_path_ignore_date())) {
+			opts->allow_ff = 0;
+			opts->ignore_date = 1;
+		}
+
 		if (file_exists(rebase_path_reschedule_failed_exec()))
 			opts->reschedule_failed_exec = 1;
 
@@ -2567,6 +2684,10 @@ int write_basic_state(struct replay_opts *opts, const char *head_name,
 		write_file(rebase_path_gpg_sign_opt(), "-S%s\n", opts->gpg_sign);
 	if (opts->signoff)
 		write_file(rebase_path_signoff(), "--signoff\n");
+	if (opts->committer_date_is_author_date)
+		write_file(rebase_path_cdate_is_adate(), "%s", "");
+	if (opts->ignore_date)
+		write_file(rebase_path_ignore_date(), "%s", "");
 	if (opts->reschedule_failed_exec)
 		write_file(rebase_path_reschedule_failed_exec(), "%s", "");
 
@@ -3507,6 +3628,8 @@ static int do_merge(struct repository *r,
 		argv_array_push(&cmd.args, git_path_merge_msg(r));
 		if (opts->gpg_sign)
 			argv_array_push(&cmd.args, opts->gpg_sign);
+		if (opts->ignore_date)
+			push_dates(&cmd, opts->committer_date_is_author_date);
 
 		/* Add the tips to be merged */
 		for (j = to_merge; j; j = j->next)
@@ -3779,7 +3902,9 @@ static int pick_commits(struct repository *r,
 	setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
 	if (opts->allow_ff)
 		assert(!(opts->signoff || opts->no_commit ||
-				opts->record_origin || opts->edit));
+				opts->record_origin || opts->edit ||
+				opts->committer_date_is_author_date ||
+				opts->ignore_date));
 	if (read_and_refresh_cache(r, opts))
 		return -1;