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diff: add --default-prefix option

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You can change the output of prefixes with diff.noprefix and
diff.mnemonicprefix, but there's no easy way to override them from the
command-line. We do have "--no-prefix", but there's no way to get back
to the default prefix. So let's add an option to do that.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2023-03-09 01:09:54 -05:00 committed by Junio C Hamano
parent 7c03d0db88
commit b39a569729
3 changed files with 29 additions and 0 deletions
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5
Documentation/diff-options.txt
View File

@ -852,6 +852,11 @@ endif::git-format-patch[]
--no-prefix::
Do not show any source or destination prefix.
--default-prefix::
Use the default source and destination prefixes ("a/" and "b/").
This is usually the default already, but may be used to override
config such as `diff.noprefix`.
--line-prefix=<prefix>::
Prepend an additional prefix to every line of output.

14
diff.c
View File

@ -5275,6 +5275,17 @@ static int diff_opt_no_prefix(const struct option *opt,
return 0;
}
static int diff_opt_default_prefix(const struct option *opt,
const char *optarg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
BUG_ON_OPT_ARG(optarg);
diff_set_default_prefix(options);
return 0;
}
static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
const struct option *opt,
const char *arg, int unset)
@ -5564,6 +5575,9 @@ struct option *add_diff_options(const struct option *opts,
OPT_CALLBACK_F(0, "no-prefix", options, NULL,
N_("do not show any source or destination prefix"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
OPT_CALLBACK_F(0, "default-prefix", options, NULL,
N_("use default prefixes a/ and b/"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_default_prefix),
OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
N_("show context between diff hunks up to the specified number of lines"),
PARSE_OPT_NONEG),

10
t/t4013-diff-various.sh
View File

@ -643,9 +643,19 @@ test_expect_success 'diff respects diff.noprefix' '
check_prefix actual file0 file0
'
test_expect_success 'diff --default-prefix overrides diff.noprefix' '
git -c diff.noprefix diff --default-prefix >actual &&
check_prefix actual a/file0 b/file0
'
test_expect_success 'diff respects diff.mnemonicprefix' '
git -c diff.mnemonicprefix diff >actual &&
check_prefix actual i/file0 w/file0
'
test_expect_success 'diff --default-prefix overrides diff.mnemonicprefix' '
git -c diff.mnemonicprefix diff --default-prefix >actual &&
check_prefix actual a/file0 b/file0
'
test_done