58a1ece478
Teach the merge-recursive strategy a --patience option to use the "patience diff" algorithm, which tends to improve results when cherry-picking a patch that reorders functions at the same time as refactoring them. To support this, struct merge_options and ll_merge_options gain an xdl_opts member, so programs can use arbitrary xdiff flags (think "XDF_IGNORE_WHITESPACE") in a git-aware merge. git merge and git rebase can be passed the -Xpatience option to use this. [jn: split from --ignore-space patch; with documentation] Signed-off-by: Justin Frankel <justin@cockos.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
#include "cache.h"
|
|
#include "commit.h"
|
|
#include "tag.h"
|
|
#include "merge-recursive.h"
|
|
#include "xdiff-interface.h"
|
|
|
|
static const char *better_branch_name(const char *branch)
|
|
{
|
|
static char githead_env[8 + 40 + 1];
|
|
char *name;
|
|
|
|
if (strlen(branch) != 40)
|
|
return branch;
|
|
sprintf(githead_env, "GITHEAD_%s", branch);
|
|
name = getenv(githead_env);
|
|
return name ? name : branch;
|
|
}
|
|
|
|
int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
|
|
{
|
|
const unsigned char *bases[21];
|
|
unsigned bases_count = 0;
|
|
int i, failed;
|
|
unsigned char h1[20], h2[20];
|
|
struct merge_options o;
|
|
struct commit *result;
|
|
|
|
init_merge_options(&o);
|
|
if (argv[0] && !suffixcmp(argv[0], "-subtree"))
|
|
o.subtree_shift = "";
|
|
|
|
if (argc < 4)
|
|
usagef("%s <base>... -- <head> <remote> ...", argv[0]);
|
|
|
|
for (i = 1; i < argc; ++i) {
|
|
const char *arg = argv[i];
|
|
|
|
if (!prefixcmp(arg, "--")) {
|
|
if (!arg[2])
|
|
break;
|
|
if (parse_merge_opt(&o, arg + 2))
|
|
die("Unknown option %s", arg);
|
|
continue;
|
|
}
|
|
if (bases_count < ARRAY_SIZE(bases)-1) {
|
|
unsigned char *sha = xmalloc(20);
|
|
if (get_sha1(argv[i], sha))
|
|
die("Could not parse object '%s'", argv[i]);
|
|
bases[bases_count++] = sha;
|
|
}
|
|
else
|
|
warning("Cannot handle more than %d bases. "
|
|
"Ignoring %s.",
|
|
(int)ARRAY_SIZE(bases)-1, argv[i]);
|
|
}
|
|
if (argc - i != 3) /* "--" "<head>" "<remote>" */
|
|
die("Not handling anything other than two heads merge.");
|
|
|
|
o.branch1 = argv[++i];
|
|
o.branch2 = argv[++i];
|
|
|
|
if (get_sha1(o.branch1, h1))
|
|
die("Could not resolve ref '%s'", o.branch1);
|
|
if (get_sha1(o.branch2, h2))
|
|
die("Could not resolve ref '%s'", o.branch2);
|
|
|
|
o.branch1 = better_branch_name(o.branch1);
|
|
o.branch2 = better_branch_name(o.branch2);
|
|
|
|
if (o.verbosity >= 3)
|
|
printf("Merging %s with %s\n", o.branch1, o.branch2);
|
|
|
|
failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
|
|
if (failed < 0)
|
|
return 128; /* die() error code */
|
|
return failed;
|
|
}
|