This gives you a patch so you can apply if you want.
FIXME pathspec support?
PS. the file list in diff queue is not sorted like a normal "git
diff". If this is a big deal, we probably can sort it later.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
builtin/backup-log.c | 100 ++++++++++++++++++++++++++++++++++++++++++
t/t2080-backup-log.sh | 25 +++++++++++
2 files changed, 125 insertions(+)
diff --git a/builtin/backup-log.c b/builtin/backup-log.c
index b370ff9d27..f8029e0011 100644
--- a/builtin/backup-log.c
+++ b/builtin/backup-log.c
@@ -1,6 +1,8 @@
#include "cache.h"
#include "builtin.h"
#include "backup-log.h"
+#include "diff.h"
+#include "diffcore.h"
#include "dir.h"
#include "object-store.h"
#include "parse-options.h"
@@ -8,6 +10,7 @@
static char const * const backup_log_usage[] = {
N_("git backup-log [--path=<path> | --id=<id>] update <path> <old-hash> <new-hash>"),
N_("git backup-log [--path=<path> | --id=<id>] cat [<options>] <change-id> <path>"),
+ N_("git backup-log [--path=<path> | --id=<id>] diff [<diff-options>] <change-id>"),
NULL
};
@@ -115,6 +118,101 @@ static int cat(int argc, const char **argv,
return ret - 1;
}
+static void queue_blk_entry_for_diff(const struct bkl_entry *e)
+{
+ unsigned mode = canon_mode(S_IFREG | 0644);
+ struct diff_filespec *one, *two;
+ const struct object_id *old, *new;
+
+ if (is_null_oid(&e->old_oid))
+ old = the_hash_algo->empty_blob;
+ else
+ old = &e->old_oid;
+
+ if (is_null_oid(&e->new_oid))
+ new = the_hash_algo->empty_blob;
+ else
+ new = &e->new_oid;
+
+ if (oideq(old, new))
+ return;
+
+ one = alloc_filespec(e->path);
+ two = alloc_filespec(e->path);
+
+ fill_filespec(one, old, 1, mode);
+ fill_filespec(two, new, 1, mode);
+ diff_queue(&diff_queued_diff, one, two);
+}
+
+static int diff_parse(struct strbuf *line, void *data)
+{
+ timestamp_t id = *(timestamp_t *)data;
+ struct bkl_entry entry;
+
+ if (bkl_parse_entry(line, &entry))
+ return -1;
+
+ if (entry.timestamp < id)
+ return 1;
+
+ if (entry.timestamp > id)
+ return 0;
+
+ queue_blk_entry_for_diff(&entry);
+ return 0;
+}
+
+static int diff(int argc, const char **argv,
+ const char *prefix, const char *log_path)
+{
+ char *end = NULL;
+ struct diff_options diffopt;
+ timestamp_t id = -1;
+ int ret, i, found_dash_dash = 0;
+
+ repo_diff_setup(the_repository, &diffopt);
+ i = 1;
+ while (i < argc) {
+ const char *arg = argv[i];
+
+ if (!found_dash_dash && *arg == '-') {
+ if (!strcmp(arg, "--")) {
+ found_dash_dash = 1;
+ i++;
+ continue;
+ }
+ ret = diff_opt_parse(&diffopt, argv + i, argc - i, prefix);
+ if (ret < 0)
+ exit(128);
+ i += ret;
+ continue;
+ }
+
+ id = strtol(arg, &end, 10);
+ if (!end || *end)
+ die(_("not a valid change id: %s"), arg);
+ i++;
+ break;
+ }
+ if (!diffopt.output_format)
+ diffopt.output_format = DIFF_FORMAT_PATCH;
+ diff_setup_done(&diffopt);
+ if (i != argc || id == -1)
+ usage_with_options(backup_log_usage, NULL);
+
+ ret = bkl_parse_file_reverse(log_path, diff_parse, &id);
+ if (ret < 0)
+ die(_("failed to parse '%s'"), log_path);
+
+ if (ret == 1) {
+ setup_pager();
+ diffcore_std(&diffopt);
+ diff_flush(&diffopt);
+ }
+ return ret - 1;
+}
+
static char *log_id_to_path(const char *id)
{
if (!strcmp(id, "index"))
@@ -156,6 +254,8 @@ int cmd_backup_log(int argc, const char **argv, const char *prefix)
return update(argc, argv, prefix, log_path);
else if (!strcmp(argv[0], "cat"))
return cat(argc, argv, prefix, log_path);
+ else if (!strcmp(argv[0], "diff"))
+ return diff(argc, argv, prefix, log_path);
else
die(_("unknown subcommand: %s"), argv[0]);
diff --git a/t/t2080-backup-log.sh b/t/t2080-backup-log.sh
index 9c004c9727..cd4288d386 100755
--- a/t/t2080-backup-log.sh
+++ b/t/t2080-backup-log.sh
@@ -105,4 +105,29 @@ test_expect_success 'backup-log cat' '
test_cmp expected actual
'
+test_expect_success 'backup-log diff' '
+ echo first >initial.t &&
+ git add initial.t &&
+ echo second >initial.t &&
+ test_tick &&
+ git -c core.backupLog=true add initial.t &&
+ git backup-log --id=index diff $test_tick >actual &&
+ cat >expected <<-\EOF &&
+ diff --git a/initial.t b/initial.t
+ index 9c59e24..e019be0 100644
+ --- a/initial.t
+ +++ b/initial.t
+ @@ -1 +1 @@
+ -first
+ +second
+ EOF
+ test_cmp expected actual &&
+ git backup-log --id=index diff --stat $test_tick >stat.actual &&
+ cat >stat.expected <<-\EOF &&
+ initial.t | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+ EOF
+ test_cmp stat.expected stat.actual
+'
+
test_done
--
2.20.0.rc2.486.g9832c05c3d
