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add -p: gracefully handle unparseable hunk headers in colored diffs

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In
https://lore.kernel.org/git/ecf6f5be-22ca-299f-a8f1-bda38e5ca246@gmail.com,
Phillipe Blain reported that the built-in `git add -p` command fails
when asked to use [`diff-so-fancy`][diff-so-fancy] to colorize the diff.

The reason is that this tool produces colored diffs with a hunk header
that does not contain any parseable `@@ ... @@` line range information,
and therefore we cannot detect any part in that header that comes after
the line range.

As proposed by Phillip Wood, let's take that for a clear indicator that
we should show the hunk headers verbatim. This is what the Perl version
of the interactive `add` command did, too.

[diff-so-fancy]: https://github.com/so-fancy/diff-so-fancy

Reported-by: Philippe Blain <levraiphilippeblain@gmail.com>
Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2022-09-01 15:42:18 +00:00 committed by Junio C Hamano
parent b6633a0053
commit fd3f7f619a
2 changed files with 27 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
add-patch.c
View File

@ -238,6 +238,7 @@ struct hunk_header {
* include the newline.
*/
size_t extra_start, extra_end, colored_extra_start, colored_extra_end;
unsigned suppress_colored_line_range:1;
};
struct hunk {
@ -358,15 +359,14 @@ static int parse_hunk_header(struct add_p_state *s, struct hunk *hunk)
if (!eol)
eol = s->colored.buf + s->colored.len;
p = memmem(line, eol - line, "@@ -", 4);
if (!p)
return error(_("could not parse colored hunk header '%.*s'"),
(int)(eol - line), line);
p = memmem(p + 4, eol - p - 4, " @@", 3);
if (!p)
return error(_("could not parse colored hunk header '%.*s'"),
(int)(eol - line), line);
if (p && (p = memmem(p + 4, eol - p - 4, " @@", 3))) {
header->colored_extra_start = p + 3 - s->colored.buf;
} else {
/* could not parse colored hunk header, leave as-is */
header->colored_extra_start = hunk->colored_start;
header->suppress_colored_line_range = 1;
}
hunk->colored_start = eol - s->colored.buf + (*eol == '\n');
header->colored_extra_start = p + 3 - s->colored.buf;
header->colored_extra_end = hunk->colored_start;
return 0;
@ -659,6 +659,15 @@ static void render_hunk(struct add_p_state *s, struct hunk *hunk,
if (!colored) {
p = s->plain.buf + header->extra_start;
len = header->extra_end - header->extra_start;
} else if (header->suppress_colored_line_range) {
strbuf_add(out,
s->colored.buf + header->colored_extra_start,
header->colored_extra_end -
header->colored_extra_start);
strbuf_add(out, s->colored.buf + hunk->colored_start,
hunk->colored_end - hunk->colored_start);
return;
} else {
strbuf_addstr(out, s->s.fraginfo_color);
p = s->colored.buf + header->colored_extra_start;

10
t/t3701-add-interactive.sh
View File

@ -767,6 +767,16 @@ test_expect_success 'detect bogus diffFilter output' '
grep "mismatched output" output
'
test_expect_success 'handle iffy colored hunk headers' '
git reset --hard &&
echo content >test &&
printf n >n &&
force_color git -c interactive.diffFilter="sed s/.*@@.*/XX/" \
add -p >output 2>&1 <n &&
grep "^XX$" output
'
test_expect_success 'diff.algorithm is passed to `git diff-files`' '
git reset --hard &&