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builtin/diff-index: learn --merge-base

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There is currently no easy way to take the diff between the working tree
or index and the merge base between an arbitrary commit and HEAD. Even
diff's `...` notation doesn't allow this because it only works between
commits. However, the ability to do this would be desirable to a user
who would like to see all the changes they've made on a branch plus
uncommitted changes without taking into account changes made in the
upstream branch.

Teach diff-index and diff (with one commit) the --merge-base option
which allows a user to use the merge base of a commit and HEAD as the
"before" side.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Denton Liu
2020-09-20 04:22:25 -07:00
committed by Junio C Hamano
parent df7dbab881
commit 0f5a1d449b
7 changed files with 92 additions and 6 deletions
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2
builtin/diff-index.c
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@ -33,6 +33,8 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
if (!strcmp(arg, "--cached"))
option |= DIFF_INDEX_CACHED;
else if (!strcmp(arg, "--merge-base"))
option |= DIFF_INDEX_MERGE_BASE;
else
usage(diff_cache_usage);
}

2
builtin/diff.c
View File

@ -139,6 +139,8 @@ static int builtin_diff_index(struct rev_info *revs,
const char *arg = argv[1];
if (!strcmp(arg, "--cached") || !strcmp(arg, "--staged"))
option |= DIFF_INDEX_CACHED;
else if (!strcmp(arg, "--merge-base"))
option |= DIFF_INDEX_MERGE_BASE;
else
usage(builtin_diff_usage);
argv++; argc--;