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pretty format %(trailers): add a "key_value_separator"

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Add a "key_value_separator" option to the "%(trailers)" pretty format,
to go along with the existing "separator" argument. In combination
these two options make it trivial to produce machine-readable (e.g. \0
and \0\0-delimited) format output.

As elaborated on in a previous commit which added "keyonly" it was
needlessly tedious to extract structured data from "%(trailers)"
before the addition of this "key_value_separator" option. As seen by
the test being added here extracting this data now becomes trivial.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2020-12-09 16:52:08 +01:00 committed by Junio C Hamano
parent 9d87d5ae02
commit 058761f1c1
5 changed files with 55 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/pretty-formats.txt
View File

@ -284,6 +284,10 @@ option is given with no value, it's enabled.
`%(trailers:only,unfold=true)` unfolds and shows all trailer lines.
** 'keyonly[=<BOOL>]': only show the key part of the trailer.
** 'valueonly[=<BOOL>]': only show the value part of the trailer.
** 'key_value_separator=<SEP>': specify a separator inserted between
trailer lines. When this option is not given each trailer key-value
pair is separated by ": ". Otherwise it shares the same semantics
as 'separator=<SEP>' above.
NOTE: Some placeholders may depend on other options given to the
revision traversal engine. For example, the `%g*` reflog options will

9
pretty.c
View File

@ -1418,6 +1418,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
struct string_list filter_list = STRING_LIST_INIT_NODUP;
struct strbuf sepbuf = STRBUF_INIT;
struct strbuf kvsepbuf = STRBUF_INIT;
size_t ret = 0;
opts.no_divider = 1;
@ -1449,6 +1450,14 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
strbuf_expand(&sepbuf, fmt, strbuf_expand_literal_cb, NULL);
free(fmt);
opts.separator = &sepbuf;
} else if (match_placeholder_arg_value(arg, "key_value_separator", &arg, &argval, &arglen)) {
char *fmt;
strbuf_reset(&kvsepbuf);
fmt = xstrndup(argval, arglen);
strbuf_expand(&kvsepbuf, fmt, strbuf_expand_literal_cb, NULL);
free(fmt);
opts.key_value_separator = &kvsepbuf;
} else if (!match_placeholder_bool_arg(arg, "only", &arg, &opts.only_trailers) &&
!match_placeholder_bool_arg(arg, "unfold", &arg, &opts.unfold) &&
!match_placeholder_bool_arg(arg, "keyonly", &arg, &opts.key_only) &&

33
t/t4205-log-pretty-formats.sh
View File

@ -776,6 +776,39 @@ test_expect_success 'pretty format %(trailers:separator=X,unfold) changes separa
test_cmp expect actual
'
test_expect_success 'pretty format %(trailers:key_value_separator) changes key-value separator' '
git log --no-walk --pretty=format:"X%(trailers:key_value_separator=%x00)X" >actual &&
(
printf "XSigned-off-by\0A U Thor <author@example.com>\n" &&
printf "Acked-by\0A U Thor <author@example.com>\n" &&
printf "[ v2 updated patch description ]\n" &&
printf "Signed-off-by\0A U Thor\n <author@example.com>\nX"
) >expect &&
test_cmp expect actual
'
test_expect_success 'pretty format %(trailers:key_value_separator,unfold) changes key-value separator' '
git log --no-walk --pretty=format:"X%(trailers:key_value_separator=%x00,unfold)X" >actual &&
(
printf "XSigned-off-by\0A U Thor <author@example.com>\n" &&
printf "Acked-by\0A U Thor <author@example.com>\n" &&
printf "[ v2 updated patch description ]\n" &&
printf "Signed-off-by\0A U Thor <author@example.com>\nX"
) >expect &&
test_cmp expect actual
'
test_expect_success 'pretty format %(trailers:separator,key_value_separator) changes both separators' '
git log --no-walk --pretty=format:"%(trailers:separator=%x00,key_value_separator=%x00%x00,unfold)" >actual &&
(
printf "Signed-off-by\0\0A U Thor <author@example.com>\0" &&
printf "Acked-by\0\0A U Thor <author@example.com>\0" &&
printf "[ v2 updated patch description ]\0" &&
printf "Signed-off-by\0\0A U Thor <author@example.com>"
) >expect &&
test_cmp expect actual
'
test_expect_success 'pretty format %(trailers) combining separator/key/keyonly/valueonly' '
git commit --allow-empty -F - <<-\EOF &&
Important fix

9
trailer.c
View File

@ -1132,7 +1132,8 @@ static void format_trailer_info(struct strbuf *out,
/* If we want the whole block untouched, we can take the fast path. */
if (!opts->only_trailers && !opts->unfold && !opts->filter &&
!opts->separator && !opts->key_only && !opts->value_only) {
!opts->separator && !opts->key_only && !opts->value_only &&
!opts->key_value_separator) {
strbuf_add(out, info->trailer_start,
info->trailer_end - info->trailer_start);
return;
@ -1155,8 +1156,12 @@ static void format_trailer_info(struct strbuf *out,
strbuf_addbuf(out, opts->separator);
if (!opts->value_only)
strbuf_addbuf(out, &tok);
if (!opts->key_only && !opts->value_only)
if (!opts->key_only && !opts->value_only) {
if (opts->key_value_separator)
strbuf_addbuf(out, opts->key_value_separator);
else
strbuf_addstr(out, ": ");
}
if (!opts->key_only)
strbuf_addbuf(out, &val);
if (!opts->separator)

1
trailer.h
View File

@ -74,6 +74,7 @@ struct process_trailer_options {
int key_only;
int value_only;
const struct strbuf *separator;
const struct strbuf *key_value_separator;
int (*filter)(const struct strbuf *, void *);
void *filter_data;
};