[ NOTE! The reason I put "RFC" in the subject rather than "PATCH" is that
I'm not 100% sure this isn't just a "shiny object" of mine rather than a
really useful thing to do. What do people think? Have you ever wanted to
access individual files in some random revision? Do you think this is
useful? I think it's cool and _may_ be useful, but I'm not going to
really push this patch. Consider it a throw-away patch unless somebody
else finds it intriguing enough.. ]
This is a fairly straightforward patch to allow "get_sha1()" to
also have shorthands for blob objects in the current index.
The syntax is very simple and intuitive: you can specify a blob
from the current index by simply specifying :<stage>:<path> or
:<path>, and get_sha1() will do the SHA1 lookup from the index
for you.
You can currently do it with "git ls-files -s <path>" and parsing the
output, but that's actually pretty awkward.
With this, you can do something like
git cat-file blob :3:Makefile
to get the contents of "Makefile" from their version during a
conflicted merge.
This does not do trees like <ent>:<path> version does. We could
do that by writing out a temporary tree object if we wanted to,
but that would smudge the object database, so I refrained from
doing that as part of this patch. If we did that,
git diff-tree :2: :3:
would be an inefficient equivalent to "git diff-stages 2 3".
---
sha1_name.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++--------
1 files changed, 46 insertions(+), 8 deletions(-)
diff --git a/sha1_name.c b/sha1_name.c
index 345935b..ec5cd2c 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -458,17 +458,55 @@ int get_sha1(const char *name, unsigned
{
int ret;
unsigned unused;
+ int namelen = strlen(name);
+ const char *cp;
prepare_alt_odb();
- ret = get_sha1_1(name, strlen(name), sha1);
- if (ret < 0) {
- const char *cp = strchr(name, ':');
- if (cp) {
- unsigned char tree_sha1[20];
- if (!get_sha1_1(name, cp-name, tree_sha1))
- return get_tree_entry(tree_sha1, cp+1, sha1,
- &unused);
+ ret = get_sha1_1(name, namelen, sha1);
+ if (!ret)
+ return ret;
+ /* sha1:path --> object name of path in ent sha1
+ * :path -> object name of path in index
+ * :[0-3]:path -> object name of path in index at stage
+ */
+ if (name[0] == ':') {
+ int stage = 0;
+ struct cache_entry *ce;
+ int pos;
+ if (namelen < 3 ||
+ name[2] != ':' ||
+ name[1] < '0' || '3' < name[1])
+ cp = name + 1;
+ else {
+ stage = name[1] - '0';
+ cp = name + 3;
}
+ namelen = namelen - (cp - name);
+ if (!active_cache)
+ read_cache();
+ if (active_nr < 0)
+ return -1;
+ pos = cache_name_pos(cp, namelen);
+ if (pos < 0)
+ pos = -pos - 1;
+ while (pos < active_nr) {
+ ce = active_cache[pos];
+ if (ce_namelen(ce) != namelen ||
+ memcmp(ce->name, cp, namelen))
+ break;
+ if (ce_stage(ce) == stage) {
+ memcpy(sha1, ce->sha1, 20);
+ return 0;
+ }
+ }
+ return -1;
+ }
+ cp = strchr(name, ':');
+ if (cp) {
+ unsigned char tree_sha1[20];
+ if (!get_sha1_1(name, cp-name, tree_sha1))
+ return get_tree_entry(tree_sha1, cp+1, sha1,
+ &unused);
}
return ret;
}
--
1.3.0.g6082
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