[PATCH v7 0/6] object-name: make ambiguous object output translatable + show tag date

This topic improves the output we emit on ambiguous objects as noted in 4/6, and makes it translatable, see 3/6. See [1] for v6.

This v7 addresses all the feedback on v7 from Junio. Note also that there's an unrelated v8[2] in reply to the v6 from another topic, because I mixed up the In-Reply-To for the two while submitting a re-roll of it, sorry about that.

1. https://lore.kernel.org/git/cover-v6-0.6-00000000000-20211228T143223Z-avarab@gmail.com/
2. https://lore.kernel.org/git/cover-v8-0.7-00000000000-20211228T150728Z-avarab@gmail.com/

Ævar Arnfjörð Bjarmason (6):
  object-name tests: add tests for ambiguous object blind spots
  object-name: explicitly handle OBJ_BAD in show_ambiguous_object()
  object-name: make ambiguous object output translatable
  object-name: show date for ambiguous tag objects
  object-name: iterate ambiguous objects before showing header
  object-name: re-use "struct strbuf" in show_ambiguous_object()

 object-name.c                       | 113 +++++++++++++++++++++++++---
 t/t1512-rev-parse-disambiguation.sh |  78 +++++++++++++++++++
 2 files changed, 179 insertions(+), 12 deletions(-)

Range-diff against v6:
1:  27f267ad555 ! 1:  28c01b7f8a5 object-name tests: add tests for ambiguous object blind spots
    @@ t/t1512-rev-parse-disambiguation.sh: export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
      . ./test-lib.sh
      
     +test_cmp_failed_rev_parse () {
    -+	dir=$1
    -+	rev=$2
    -+	shift
    -+
    -+	test_must_fail git -C "$dir" rev-parse "$rev" 2>actual.raw &&
    -+	sed "s/\($rev\)[0-9a-f]*/\1.../g" <actual.raw >actual &&
    ++	cat >expect &&
    ++	test_must_fail git -C "$1" rev-parse "$2" 2>actual.raw &&
    ++	sed "s/\($2\)[0-9a-f]*/\1.../" <actual.raw >actual &&
     +	test_cmp expect actual
     +}
     +
    @@ t/t1512-rev-parse-disambiguation.sh: export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
     +	) &&
     +
     +	test_must_fail git -C blob.prefix rev-parse dead &&
    -+	cat >expect <<-\EOF &&
    ++	test_cmp_failed_rev_parse blob.prefix beef <<-\EOF
     +	error: short object ID beef... is ambiguous
     +	hint: The candidates are:
     +	hint:   beef... blob
    @@ t/t1512-rev-parse-disambiguation.sh: export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
     +	Use '\''--'\'' to separate paths from revisions, like this:
     +	'\''git <command> [<revision>...] -- [<file>...]'\''
     +	EOF
    -+	test_cmp_failed_rev_parse blob.prefix beef
     +'
     +
    -+test_expect_success 'ambiguous loose blob parsed as OBJ_BAD' '
    ++test_expect_success 'ambiguous loose bad object parsed as OBJ_BAD' '
     +	git init --bare blob.bad &&
     +	(
     +		cd blob.bad &&
    @@ t/t1512-rev-parse-disambiguation.sh: export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
     +		echo xyzhjpyvwl | git hash-object -t bad -w --stdin --literally
     +	) &&
     +
    -+	cat >expect <<-\EOF &&
    ++	test_cmp_failed_rev_parse blob.bad bad0 <<-\EOF
     +	error: short object ID bad0... is ambiguous
     +	hint: The candidates are:
     +	fatal: invalid object type
     +	EOF
    -+	test_cmp_failed_rev_parse blob.bad bad0
     +'
     +
     +test_expect_success POSIXPERM 'ambigous zlib corrupt loose blob' '
    @@ t/t1512-rev-parse-disambiguation.sh: export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
     +		echo broken >$oidf
     +	) &&
     +
    -+	cat >expect <<-\EOF &&
    ++	test_cmp_failed_rev_parse blob.corrupt cafe <<-\EOF
     +	error: short object ID cafe... is ambiguous
     +	hint: The candidates are:
     +	error: inflate: data stream error (incorrect header check)
    @@ t/t1512-rev-parse-disambiguation.sh: export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
     +	Use '\''--'\'' to separate paths from revisions, like this:
     +	'\''git <command> [<revision>...] -- [<file>...]'\''
     +	EOF
    -+	test_cmp_failed_rev_parse blob.corrupt cafe
     +'
     +
      if ! test_have_prereq SHA1
2:  c78243dc701 = 2:  b7027dfc843 object-name: explicitly handle OBJ_BAD in show_ambiguous_object()
3:  daebc95542c ! 3:  65801f2c890 object-name: make ambiguous object output translatable
    @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, voi
     +		 *    "deadbeef tag Some Tag Message"
     +		 *
     +		 * The second argument is the "tag" string from
    -+		 * object.c, it should (hopefully) already be
    -+		 * translated.
    ++		 * object.c.
     +		 */
     +		strbuf_addf(&desc, _("%s tag %s"), hash, tag_tag);
     +	} else if (type == OBJ_TREE) {
    @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, voi
     -	       desc.buf);
     +	/*
     +	 * TRANSLATORS: This is line item of ambiguous object output
    -+	 * from describe_ambiguous_object() above.
    ++	 * from describe_ambiguous_object() above. For RTL languages
    ++	 * you'll probably want to swap the "%s" and leading " " space
    ++	 * around.
     +	 */
     +	advise(_("  %s"), desc.buf);
      
4:  b5aa6e266f6 ! 4:  2e5511c9fa5 object-name: show date for ambiguous tag objects
    @@ Commit message
     
             hint:   b7e68c41d92 tag v2.32.0
     
    +    As with OBJ_COMMIT we punt on the cases where the date in the object
    +    is nonsensical, and other cases where parse_tag() might fail. For
    +    those we'll use our default date of "0" and tag message of
    +    "". E.g. for some of the corrupt tags created by t3800-mktag.sh we'd
    +    emit a line like:
    +
    +        hint:   8d62cb0b06 tag 1970-01-01 -
    +
    +    We could detect that and emit a "%s [bad tag object]" message (to go
    +    with the existing generic "%s [bad object]"), but I don't think it's
    +    worth the effort. Users are unlikely to ever run into cases where
    +    they've got a broken object that's also ambiguous, and in case they do
    +    output that's a bit nonsensical beats wasting translator time on this
    +    obscure edge case.
    +
    +    We should instead change parse_tag_buffer() to be more eager to emit
    +    an error() instead of silently aborting with "return -1;". In the case
    +    of "t3800-mktag.sh" it takes the "size < the_hash_algo->hexsz + 24"
    +    branch.
    +
         Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
     
      ## object-name.c ##
    @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, voi
     +		 *    "deadbeef tag 2021-01-01 - Some Tag Message"
      		 *
      		 * The second argument is the "tag" string from
    - 		 * object.c, it should (hopefully) already be
    - 		 * translated.
    + 		 * object.c.
      		 */
     -		strbuf_addf(&desc, _("%s tag %s"), hash, tag_tag);
     +		strbuf_addf(&desc, _("%s tag %s - %s"), hash,
5:  644b076b2a6 ! 5:  2c03cdd3c1e object-name: iterate ambiguous objects before showing header
    @@ object-name.c: static int init_object_disambiguation(struct repository *r,
      	int type;
      	const char *hash;
     @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, void *data)
    - 	 * TRANSLATORS: This is line item of ambiguous object output
    - 	 * from describe_ambiguous_object() above.
    + 	 * you'll probably want to swap the "%s" and leading " " space
    + 	 * around.
      	 */
     -	advise(_("  %s"), desc.buf);
     +	strbuf_addf(advice, _("  %s\n"), desc.buf);
    @@ object-name.c: static enum get_oid_result get_short_oid(struct repository *r,
      	return status;
     
      ## t/t1512-rev-parse-disambiguation.sh ##
    -@@ t/t1512-rev-parse-disambiguation.sh: test_expect_success 'ambiguous loose blob parsed as OBJ_BAD' '
    +@@ t/t1512-rev-parse-disambiguation.sh: test_expect_success 'ambiguous loose bad object parsed as OBJ_BAD' '
      
    - 	cat >expect <<-\EOF &&
    + 	test_cmp_failed_rev_parse blob.bad bad0 <<-\EOF
      	error: short object ID bad0... is ambiguous
     -	hint: The candidates are:
      	fatal: invalid object type
      	EOF
    - 	test_cmp_failed_rev_parse blob.bad bad0
    + '
     @@ t/t1512-rev-parse-disambiguation.sh: test_expect_success POSIXPERM 'ambigous zlib corrupt loose blob' '
      
    - 	cat >expect <<-\EOF &&
    + 	test_cmp_failed_rev_parse blob.corrupt cafe <<-\EOF
      	error: short object ID cafe... is ambiguous
     -	hint: The candidates are:
      	error: inflate: data stream error (incorrect header check)
6:  6a31cfcfc29 ! 6:  bf226f67099 object-name: re-use "struct strbuf" in show_ambiguous_object()
    @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, voi
      		strbuf_release(&date);
      		strbuf_release(&msg);
     @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, void *data)
    - 		 * object.c, it should (hopefully) already be
    - 		 * translated.
    + 		 * The second argument is the "tag" string from
    + 		 * object.c.
      		 */
     -		strbuf_addf(&desc, _("%s tag %s - %s"), hash,
     +		strbuf_addf(sb, _("%s tag %s - %s"), hash,
    @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, voi
      
      
     @@ object-name.c: static int show_ambiguous_object(const struct object_id *oid, void *data)
    - 	 * TRANSLATORS: This is line item of ambiguous object output
    - 	 * from describe_ambiguous_object() above.
    + 	 * you'll probably want to swap the "%s" and leading " " space
    + 	 * around.
      	 */
     -	strbuf_addf(advice, _("  %s\n"), desc.buf);
     +	strbuf_addf(advice, _("  %s\n"), sb->buf);