[PATCH v3 0/3] builtin/tag.c: add --trailer option

Follow-up patch taking welcome feedback from Patrick and JCH.

Since git-tag --list --format="%(trailers)" can interpret trailers from annotated tag messages, it seems natural to support --trailer when writing a new tag message.

git-commit accomplishes this by taking --trailer arguments and passing them to git interpret-trailer. This patch series refactors that logic and uses it to implement --trailer on git-tag.

Also Included are updates to the i18n files, since the git-tag patch changes some strings that are subject to translation. If I am out of my lane here, please feel free to separate or leave out the i18n patch.

John Passaro (3):
  builtin/commit.c: refactor --trailer logic
  builtin/tag.c: add --trailer arg
  po: update git-tag translations

 Documentation/git-tag.txt |  18 +++++-
 builtin/commit.c          |  20 +------
 builtin/tag.c             |  41 +++++++++++---
 po/bg.po                  |   2 +
 po/ca.po                  |   4 +-
 po/de.po                  |   2 +
 po/el.po                  |   9 ++-
 po/es.po                  |  14 +++--
 po/fr.po                  |   2 +
 po/id.po                  |   2 +
 po/it.po                  |   6 +-
 po/ko.po                  |  10 ++--
 po/pl.po                  |   6 +-
 po/ru.po                  |   1 +
 po/sv.po                  |   2 +
 po/tr.po                  |   2 +
 po/uk.po                  |   2 +
 po/vi.po                  |   2 +
 po/zh_CN.po               |   2 +
 po/zh_TW.po               |   2 +
 t/t7004-tag.sh            | 114 ++++++++++++++++++++++++++++++++++++++
 trailer.c                 |  12 ++++
 trailer.h                 |   8 +++
 23 files changed, 237 insertions(+), 46 deletions(-)

base-commit: 786a3e4b8d754d2b14b1208b98eeb0a554ef19a8
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1723%2Fjpassaro%2Fjp%2Ftag-trailer-arg-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1723/jpassaro/jp/tag-trailer-arg-v3
Pull-Request: https://github.com/gitgitgadget/git/pull/1723

Range-diff vs v2:

 -:  ----------- > 1:  0c9517f434a builtin/commit.c: refactor --trailer logic
 1:  d4beb7cd67e ! 2:  5b6239167b8 builtin/tag.c: add --trailer arg
     @@ Metadata
       ## Commit message ##
          builtin/tag.c: add --trailer arg
      
     -    Teach git-tag to accept --trailer option to add trailers to annotated
     -    tag messages, like git-commit. Move the code that git-commit uses for
     -    trailers to the trailer.h API, so it can be re-used for git-tag.
     +    git-tag currently supports interpreting trailers from an annotated tag
     +    message, using --list --format="%(trailers)". There is no ergonomic way
     +    to add trailers to an annotated tag message.
     +
     +    In a previous patch, we refactored git-commit's implementation of its
     +    --trailer arg to the trailer.h API. Let's use that new function to teach
     +    git-tag the same --trailer argument, emulating as much of git-commit's
     +    behavior as much as possible.
      
          Signed-off-by: John Passaro <john.a.passaro@gmail.com>
     +    Helped-by: Patrick Steinhardt <ps@pks.im>
      
       ## Documentation/git-tag.txt ##
      @@ Documentation/git-tag.txt: SYNOPSIS
     @@ Documentation/git-tag.txt: This option is only applicable when listing tags with
       --edit::
       	The message taken from file with `-F` and command line with
      
     - ## builtin/commit.c ##
     -@@
     - #include "commit-reach.h"
     - #include "commit-graph.h"
     - #include "pretty.h"
     -+#include "trailer.h"
     - 
     - static const char * const builtin_commit_usage[] = {
     - 	N_("git commit [-a | --interactive | --patch] [-s] [-v] [-u<mode>] [--amend]\n"
     -@@ builtin/commit.c: static int prepare_to_commit(const char *index_file, const char *prefix,
     - 	fclose(s->fp);
     - 
     - 	if (trailer_args.nr) {
     --		struct child_process run_trailer = CHILD_PROCESS_INIT;
     --
     --		strvec_pushl(&run_trailer.args, "interpret-trailers",
     --			     "--in-place", "--no-divider",
     --			     git_path_commit_editmsg(), NULL);
     --		strvec_pushv(&run_trailer.args, trailer_args.v);
     --		run_trailer.git_cmd = 1;
     --		if (run_command(&run_trailer))
     -+		if (amend_file_with_trailers(git_path_commit_editmsg(), &trailer_args))
     - 			die(_("unable to pass trailers to --trailers"));
     - 		strvec_clear(&trailer_args);
     - 	}
     -
       ## builtin/tag.c ##
      @@
       #include "date.h"
     @@ builtin/tag.c: static void create_tag(const struct object_id *object, const char
       		}
       	}
       
     -@@ builtin/tag.c: struct msg_arg {
     - 	struct strbuf buf;
     - };
     - 
     -+static int opt_pass_trailer(const struct option *opt, const char *arg, int unset)
     -+{
     -+	BUG_ON_OPT_NEG(unset);
     -+
     -+	strvec_pushl(opt->value, "--trailer", arg, NULL);
     -+	return 0;
     -+}
     -+
     - static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
     - {
     - 	struct msg_arg *msg = opt->value;
      @@ builtin/tag.c: int cmd_tag(int argc, const char **argv, const char *prefix)
       	struct ref_sorting *sorting;
       	struct string_list sorting_options = STRING_LIST_INIT_DUP;
     @@ builtin/tag.c: int cmd_tag(int argc, const char **argv, const char *prefix)
       		OPT_CALLBACK_F('m', "message", &msg, N_("message"),
       			       N_("tag message"), PARSE_OPT_NONEG, parse_msg_arg),
       		OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
     -+		OPT_CALLBACK_F(0, "trailer", &trailer_args, N_("trailer"), N_("add custom trailer(s)"),
     -+				PARSE_OPT_NONEG, opt_pass_trailer),
     ++		OPT_PASSTHRU_ARGV(0, "trailer", &trailer_args, N_("trailer"),
     ++				  N_("add custom trailer(s)"), PARSE_OPT_NONEG),
       		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of tag message")),
       		OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
       		OPT_CLEANUP(&cleanup_arg),
     @@ t/t7004-tag.sh: test_expect_success 'git tag --format with ahead-behind' '
       	refs/tags/tag-zero-lines 0 1 !
       	EOF
       	git tag -l --format="%(refname) %(ahead-behind:HEAD) !" >actual 2>err &&
     -
     - ## trailer.c ##
     -@@
     - #include "commit.h"
     - #include "trailer.h"
     - #include "list.h"
     -+#include "run-command.h"
     - /*
     -  * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
     -  */
     -@@ trailer.c: void trailer_iterator_release(struct trailer_iterator *iter)
     - 	strbuf_release(&iter->val);
     - 	strbuf_release(&iter->key);
     - }
     -+
     -+int amend_file_with_trailers(const char *path, struct strvec const* trailer_args) {
     -+	struct child_process run_trailer = CHILD_PROCESS_INIT;
     -+
     -+	run_trailer.git_cmd = 1;
     -+	strvec_pushl(&run_trailer.args, "interpret-trailers",
     -+		     "--in-place", "--no-divider",
     -+		     path, NULL);
     -+	strvec_pushv(&run_trailer.args, trailer_args->v);
     -+	return run_command(&run_trailer);
     -+}
     -
     - ## trailer.h ##
     -@@
     - 
     - #include "list.h"
     - #include "strbuf.h"
     -+#include "strvec.h"
     - 
     - enum trailer_where {
     - 	WHERE_DEFAULT,
     -@@ trailer.h: int trailer_iterator_advance(struct trailer_iterator *iter);
     -  */
     - void trailer_iterator_release(struct trailer_iterator *iter);
     - 
     -+/*
     -+ * Augment a file to add trailers to it by running git-interpret-trailers.
     -+ * This calls run_command() and its return value is the same (i.e. 0 for
     -+ * success, various non-zero for other errors). See run-command.h.
     -+ */
     -+int amend_file_with_trailers(const char *path, struct strvec const* trailer_args);
     -+
     - #endif /* TRAILER_H */
 -:  ----------- > 3:  d5335e30b0b po: update git-tag translations