(WIP, mostly stream-of-concious notes + reasoning)
When using "git format-patch --range-diff", the pre and
post-image blob OIDs are in each email, while the exact
commit OIDs are rarely shared via emails (only the tip
commit from "git request-pull").
These blob OIDs make it easy to search for or lookup the
full emails which create them, or the blob itself once
it's fetched via git.
public-inbox indexes and allows querying specifically for blob
OIDs via dfpre:/dfpost: since June 2017. As of Jan 2019,
public-inbox also supports recreating blobs out of patch emails
(querying internally with dfpre:/dfpost: and doing "git apply")
Searching on these blob OIDs also makes it easier to find
previous versions of the patch sets using any mail search
engine.
Future changes to public-inbox may allow generating custom
diffs out of any blobs it can find or recreate.
Most of this is pretty public-inbox-specific and would've
made some future changes to public-inbox much easier....
(if we had this from the start of range-diff).
Unfortunately, it won't help with cases where range-diffs
are already published, but range-diff isn't too old.
I'm also still learning my way around git's C internals, but
using patch.{old,new}_oid_prefix seems alright...
FIXME: tests, t3206 needs updating
Not-signed-off-by: Eric Wong <e@xxxxxxxxx>
---
range-diff.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/range-diff.c b/range-diff.c
index 7fed5a3b4b..85d2f1f58f 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -118,13 +118,24 @@ static int read_patches(const char *range, struct string_list *list)
die(_("could not parse git header '%.*s'"), (int)len, line);
strbuf_addstr(&buf, " ## ");
if (patch.is_new > 0)
- strbuf_addf(&buf, "%s (new)", patch.new_name);
+ strbuf_addf(&buf, "%s (new %s)",
+ patch.new_name,
+ patch.new_oid_prefix);
else if (patch.is_delete > 0)
- strbuf_addf(&buf, "%s (deleted)", patch.old_name);
+ strbuf_addf(&buf, "%s (deleted %s)",
+ patch.old_name,
+ patch.old_oid_prefix);
else if (patch.is_rename)
- strbuf_addf(&buf, "%s => %s", patch.old_name, patch.new_name);
+ strbuf_addf(&buf, "%s => %s (%s..%s)",
+ patch.old_name,
+ patch.new_name,
+ patch.old_oid_prefix,
+ patch.new_oid_prefix);
else
- strbuf_addstr(&buf, patch.new_name);
+ strbuf_addf(&buf, "%s (%s..%s)",
+ patch.new_name,
+ patch.old_oid_prefix,
+ patch.new_oid_prefix);
free(current_filename);
if (patch.is_delete > 0)
