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diff: vary default prefix depending on what are compared

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With a new configuration "diff.mnemonicprefix", "git diff" shows the
differences between various combinations of preimage and postimage trees
with prefixes different from the standard "a/" and "b/".  Hopefully this
will make the distinction stand out for some people.

    "git diff" compares the (i)ndex and the (w)ork tree;
    "git diff HEAD" compares a (c)ommit and the (w)ork tree;
    "git diff --cached" compares a (c)ommit and the (i)ndex;
    "git-diff HEAD:file1 file2" compares an (o)bject and a (w)ork tree entity;
    "git diff --no-index a b" compares two non-git things (1) and (2).

Because these mnemonics now have meanings, they are swapped when reverse
diff is in effect and this feature is enabled.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2008-08-18 20:08:09 -07:00
parent 53d1589ff6
commit a5a818ee48
7 changed files with 70 additions and 8 deletions
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8
combine-diff.c
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@ -675,9 +675,13 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
int i, show_hunks;
int working_tree_file = is_null_sha1(elem->sha1);
int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
const char *a_prefix, *b_prefix;
mmfile_t result_file;
context = opt->context;
a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
/* Read the result of merge first */
if (!working_tree_file)
result = grab_blob(elem->sha1, &result_size);
@ -853,13 +857,13 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
dump_quoted_path("--- ", "", "/dev/null",
c_meta, c_reset);
else
dump_quoted_path("--- ", opt->a_prefix, elem->path,
dump_quoted_path("--- ", a_prefix, elem->path,
c_meta, c_reset);
if (deleted)
dump_quoted_path("+++ ", "", "/dev/null",
c_meta, c_reset);
else
dump_quoted_path("+++ ", opt->b_prefix, elem->path,
dump_quoted_path("+++ ", b_prefix, elem->path,
c_meta, c_reset);
dump_sline(sline, cnt, num_parent,
DIFF_OPT_TST(opt, COLOR_DIFF));