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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"
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#include "commit.h"
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#include "tag.h"
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#include "merge-recursive.h"
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#include "xdiff-interface.h"
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static const char *better_branch_name(const char *branch)
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{
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static char githead_env[8 + 40 + 1];
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char *name;
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if (strlen(branch) != 40)
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return branch;
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sprintf(githead_env, "GITHEAD_%s", branch);
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name = getenv(githead_env);
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return name ? name : branch;
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}
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int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
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{
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const unsigned char *bases[21];
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unsigned bases_count = 0;
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int i, failed;
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unsigned char h1[20], h2[20];
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struct merge_options o;
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struct commit *result;
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init_merge_options(&o);
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if (argv[0] && !suffixcmp(argv[0], "-subtree"))
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o.subtree_shift = "";
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if (argc < 4)
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usagef("%s <base>... -- <head> <remote> ...", argv[0]);
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for (i = 1; i < argc; ++i) {
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const char *arg = argv[i];
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if (!prefixcmp(arg, "--")) {
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if (!arg[2])
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break;
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if (parse_merge_opt(&o, arg + 2))
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die("Unknown option %s", arg);
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continue;
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}
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if (bases_count < ARRAY_SIZE(bases)-1) {
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unsigned char *sha = xmalloc(20);
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if (get_sha1(argv[i], sha))
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die("Could not parse object '%s'", argv[i]);
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bases[bases_count++] = sha;
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}
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else
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warning("Cannot handle more than %d bases. "
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"Ignoring %s.",
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(int)ARRAY_SIZE(bases)-1, argv[i]);
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}
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if (argc - i != 3) /* "--" "<head>" "<remote>" */
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die("Not handling anything other than two heads merge.");
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o.branch1 = argv[++i];
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o.branch2 = argv[++i];
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if (get_sha1(o.branch1, h1))
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die("Could not resolve ref '%s'", o.branch1);
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if (get_sha1(o.branch2, h2))
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die("Could not resolve ref '%s'", o.branch2);
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o.branch1 = better_branch_name(o.branch1);
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o.branch2 = better_branch_name(o.branch2);
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if (o.verbosity >= 3)
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printf("Merging %s with %s\n", o.branch1, o.branch2);
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failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
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if (failed < 0)
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return 128; /* die() error code */
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return failed;
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}
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