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Teach diff machinery to display other prefixes than "a/" and "b/"

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With the new options "--src-prefix=<prefix>", "--dst-prefix=<prefix>"
and "--no-prefix", you can now control the path prefixes of the diff
machinery.  These used to by hardwired to "a/" for the source prefix
and "b/" for the destination prefix.

Initial patch by Pascal Obry.  Sane option names suggested by Linus.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2007-12-18 19:32:14 +00:00 committed by Junio C Hamano
parent 74f6b03c5c
commit eab9a40b6d
3 changed files with 27 additions and 8 deletions
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9
Documentation/diff-options.txt
View File

@ -211,5 +211,14 @@ endif::git-format-patch[]
--no-ext-diff::
Disallow external diff drivers.
--src-prefix=<prefix>::
Show the given source prefix instead of "a/".
--dst-prefix=<prefix>::
Show the given destination prefix instead of "b/".
--no-prefix::
Do not show any source or destination prefix.
For more detailed explanation on these common options, see also
link:diffcore.html[diffcore documentation].

25
diff.c
View File

@ -290,9 +290,10 @@ static void emit_rewrite_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
int color_diff)
struct diff_options *o)
{
int lc_a, lc_b;
int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
const char *name_a_tab, *name_b_tab;
const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
@ -309,9 +310,9 @@ static void emit_rewrite_diff(const char *name_a,
diff_populate_filespec(two, 0);
lc_a = count_lines(one->data, one->size);
lc_b = count_lines(two->data, two->size);
printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
metainfo, name_a, name_a_tab, reset,
metainfo, name_b, name_b_tab, reset, fraginfo);
printf("%s--- %s%s%s%s\n%s+++ %s%s%s%s\n%s@@ -",
metainfo, o->a_prefix, name_a, name_a_tab, reset,
metainfo, o->b_prefix, name_b, name_b_tab, reset, fraginfo);
print_line_count(lc_a);
printf(" +");
print_line_count(lc_b);
@ -1212,8 +1213,8 @@ static void builtin_diff(const char *name_a,
const char *set = diff_get_color_opt(o, DIFF_METAINFO);
const char *reset = diff_get_color_opt(o, DIFF_RESET);
a_one = quote_two("a/", name_a + (*name_a == '/'));
b_two = quote_two("b/", name_b + (*name_b == '/'));
a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
@ -1242,8 +1243,7 @@ static void builtin_diff(const char *name_a,
if ((one->mode ^ two->mode) & S_IFMT)
goto free_ab_and_return;
if (complete_rewrite) {
emit_rewrite_diff(name_a, name_b, one, two,
DIFF_OPT_TST(o, COLOR_DIFF));
emit_rewrite_diff(name_a, name_b, one, two, o);
o->found_changes = 1;
goto free_ab_and_return;
}
@ -2020,6 +2020,9 @@ void diff_setup(struct diff_options *options)
else
DIFF_OPT_CLR(options, COLOR_DIFF);
options->detect_rename = diff_detect_rename_default;
options->a_prefix = "a/";
options->b_prefix = "b/";
}
int diff_setup_done(struct diff_options *options)
@ -2291,6 +2294,12 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
else if (40 < options->abbrev)
options->abbrev = 40;
}
else if (!prefixcmp(arg, "--src-prefix="))
options->a_prefix = arg + 13;
else if (!prefixcmp(arg, "--dst-prefix="))
options->b_prefix = arg + 13;
else if (!strcmp(arg, "--no-prefix"))
options->a_prefix = options->b_prefix = "";
else
return 0;
return 1;

1
diff.h
View File

@ -69,6 +69,7 @@ struct diff_options {
const char *orderfile;
const char *pickaxe;
const char *single_follow;
const char *a_prefix, *b_prefix;
unsigned flags;
int context;
int break_opt;