From: Phil Hord <ho...@cisco.com>

When a commit is grepped and matching filenames are printed, grep-objects
creates the filename by prefixing the original cmdline argument to the
matched path separated by a colon.  Normally this forms a valid blob
reference to the filename, like this:

  git grep -l foo HEAD
  HEAD:some/path/to/foo.txt
      ^

But a tree path may be given to grep instead; in this case the colon is
not a valid delimiter to use since it is placed inside a path.

  git grep -l foo HEAD:some
  HEAD:some:path/to/foo.txt
           ^

The slash path delimiter should be used instead.  Fix git grep to
discern the correct delimiter so it can report valid object names.

  git grep -l foo HEAD:some
  HEAD:some/path/to/foo.txt
           ^

Also, prevent the delimiter being added twice, as happens now in these
examples:

  git grep -l foo HEAD:
  HEAD::some/path/to/foo.txt
       ^
  git grep -l foo HEAD:some/
  HEAD:some/:path/to/foo.txt
            ^

Add a test to confirm correct path forming.

Signed-off-by: Jeff King <p...@peff.net>
---
I left the author as you, since you have done all the hard work; this is
really just me rebasing your patch on top of mine. But note that you did
not signoff the original.

 builtin/grep.c  | 13 +++++++++----
 t/t7810-grep.sh | 15 +++++++++++++++
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index ee47d49..2df7986 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -26,6 +26,7 @@ struct object_to_grep {
 struct object_to_grep {
        struct object *item;
        const char *name;
+       unsigned has_path:1;
 };
 
 static int use_threads = 1;
@@ -462,7 +463,7 @@ static int grep_object(struct grep_opt *opt, const struct 
pathspec *pathspec,
 }
 
 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
-                      struct object *obj, const char *name)
+                      struct object *obj, const char *name, char delimiter)
 {
        if (obj->type == OBJ_BLOB)
                return grep_sha1(opt, obj->sha1, name, 0, NULL);
@@ -485,7 +486,8 @@ static int grep_object(struct grep_opt *opt, const struct 
pathspec *pathspec,
                strbuf_init(&base, PATH_MAX + len + 1);
                if (len) {
                        strbuf_add(&base, name, len);
-                       strbuf_addch(&base, ':');
+                       if (name[len-1] != delimiter)
+                               strbuf_addch(&base, delimiter);
                }
                init_tree_desc(&tree, data, size);
                hit = grep_tree(opt, pathspec, &tree, &base, base.len,
@@ -506,7 +508,8 @@ static int grep_objects(struct grep_opt *opt, const struct 
pathspec *pathspec,
        for (i = 0; i < nr; i++) {
                struct object *real_obj;
                real_obj = deref_tag(list[i].item, NULL, 0);
-               if (grep_object(opt, pathspec, real_obj, list[i].name)) {
+               if (grep_object(opt, pathspec, real_obj, list[i].name,
+                               list[i].has_path ? '/' : ':')) {
                        hit = 1;
                        if (opt->status_only)
                                break;
@@ -822,8 +825,9 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
        for (i = 0; i < argc; i++) {
                const char *arg = argv[i];
                unsigned char sha1[20];
+               struct object_context oc;
                /* Is it a rev? */
-               if (!get_sha1(arg, sha1)) {
+               if (!get_sha1_with_context(arg, 0, sha1, &oc)) {
                        struct object *object = parse_object_or_die(sha1, arg);
                        if (!seen_dashdash)
                                verify_non_filename(prefix, arg);
@@ -831,6 +835,7 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
                        ALLOC_GROW(list, list_nr+1, list_alloc);
                        list[list_nr].item = object;
                        list[list_nr].name = arg;
+                       list[list_nr].has_path = !!oc.path[0];
                        list_nr++;
                        continue;
                }
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index f698001..2494bfc 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -886,6 +886,21 @@ cat >expected <<EOF
 '
 
 cat >expected <<EOF
+HEAD:t/a/v:1:vvv
+HEAD:t/v:1:vvv
+EOF
+
+test_expect_success "grep HEAD -- path/" '
+       git grep -n -e vvv HEAD -- t/ >actual &&
+       test_cmp expected actual
+'
+
+test_expect_success "grep HEAD:path" '
+       git grep -n -e vvv HEAD:t/ >actual &&
+       test_cmp expected actual
+'
+
+cat >expected <<EOF
 hello.c:int main(int argc, const char **argv)
 hello.c:       printf("Hello world.\n");
 EOF
-- 
1.8.4.2.g87d4a77
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