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Diffstat (limited to 'third_party/git/merge-recursive.h')
| -rw-r--r-- | third_party/git/merge-recursive.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/third_party/git/merge-recursive.h b/third_party/git/merge-recursive.h new file mode 100644 index 000000000000..978847e67248 --- /dev/null +++ b/third_party/git/merge-recursive.h @@ -0,0 +1,124 @@ +#ifndef MERGE_RECURSIVE_H +#define MERGE_RECURSIVE_H + +#include "strbuf.h" + +struct commit; +struct commit_list; +struct object_id; +struct repository; +struct tree; + +struct merge_options_internal; +struct merge_options { + struct repository *repo; + + /* ref names used in console messages and conflict markers */ + const char *ancestor; + const char *branch1; + const char *branch2; + + /* rename related options */ + int detect_renames; + enum { + MERGE_DIRECTORY_RENAMES_NONE = 0, + MERGE_DIRECTORY_RENAMES_CONFLICT = 1, + MERGE_DIRECTORY_RENAMES_TRUE = 2 + } detect_directory_renames; + int rename_limit; + int rename_score; + int show_rename_progress; + + /* xdiff-related options (patience, ignore whitespace, ours/theirs) */ + long xdl_opts; + enum { + MERGE_VARIANT_NORMAL = 0, + MERGE_VARIANT_OURS, + MERGE_VARIANT_THEIRS + } recursive_variant; + + /* console output related options */ + int verbosity; + unsigned buffer_output; /* 1: output at end, 2: keep buffered */ + struct strbuf obuf; /* output buffer; if buffer_output == 2, caller + * must handle and call strbuf_release */ + + /* miscellaneous control options */ + const char *subtree_shift; + unsigned renormalize : 1; + + /* internal fields used by the implementation */ + struct merge_options_internal *priv; +}; + +void init_merge_options(struct merge_options *opt, struct repository *repo); + +/* parse the option in s and update the relevant field of opt */ +int parse_merge_opt(struct merge_options *opt, const char *s); + +/* + * RETURN VALUES: All the merge_* functions below return a value as follows: + * > 0 Merge was clean + * = 0 Merge had conflicts + * < 0 Merge hit an unexpected and unrecoverable problem (e.g. disk + * full) and aborted merge part-way through. + */ + +/* + * rename-detecting three-way merge, no recursion. + * + * Outputs: + * - See RETURN VALUES above + * - No commit is created + * - opt->repo->index has the new index + * - $GIT_INDEX_FILE is not updated + * - The working tree is updated with results of the merge + */ +int merge_trees(struct merge_options *opt, + struct tree *head, + struct tree *merge, + struct tree *merge_base); + +/* + * merge_recursive is like merge_trees() but with recursive ancestor + * consolidation and, if the commit is clean, creation of a commit. + * + * NOTE: empirically, about a decade ago it was determined that with more + * than two merge bases, optimal behavior was found when the + * merge_bases were passed in the order of oldest commit to newest + * commit. Also, merge_bases will be consumed (emptied) so make a + * copy if you need it. + * + * Outputs: + * - See RETURN VALUES above + * - If merge is clean, a commit is created and its address written to *result + * - opt->repo->index has the new index + * - $GIT_INDEX_FILE is not updated + * - The working tree is updated with results of the merge + */ +int merge_recursive(struct merge_options *opt, + struct commit *h1, + struct commit *h2, + struct commit_list *merge_bases, + struct commit **result); + +/* + * merge_recursive_generic can operate on trees instead of commits, by + * wrapping the trees into virtual commits, and calling merge_recursive(). + * It also writes out the in-memory index to disk if the merge is successful. + * + * Outputs: + * - See RETURN VALUES above + * - If merge is clean, a commit is created and its address written to *result + * - opt->repo->index has the new index + * - $GIT_INDEX_FILE is updated + * - The working tree is updated with results of the merge + */ +int merge_recursive_generic(struct merge_options *opt, + const struct object_id *head, + const struct object_id *merge, + int num_merge_bases, + const struct object_id **merge_bases, + struct commit **result); + +#endif |