merge-recursive.h

   1 #ifndef MERGE_RECURSIVE_H
   2 #define MERGE_RECURSIVE_H
   3
   4 #include "strbuf.h"
   5
   6 struct commit;
   7 struct commit_list;
   8 struct object_id;
   9 struct repository;
  10 struct tree;
  11
  12 struct merge_options_internal;
  13 struct merge_options {
  14         struct repository *repo;
  15
  16         /* ref names used in console messages and conflict markers */
  17         const char *ancestor;
  18         const char *branch1;
  19         const char *branch2;
  20
  21         /* rename related options */
  22         int detect_renames;
  23         enum {
  24                 MERGE_DIRECTORY_RENAMES_NONE = 0,
  25                 MERGE_DIRECTORY_RENAMES_CONFLICT = 1,
  26                 MERGE_DIRECTORY_RENAMES_TRUE = 2
  27         } detect_directory_renames;
  28         int rename_limit;
  29         int rename_score;
  30         int show_rename_progress;
  31
  32         /* xdiff-related options (patience, ignore whitespace, ours/theirs) */
  33         long xdl_opts;
  34         int conflict_style;
  35         enum {
  36                 MERGE_VARIANT_NORMAL = 0,
  37                 MERGE_VARIANT_OURS,
  38                 MERGE_VARIANT_THEIRS
  39         } recursive_variant;
  40
  41         /* console output related options */
  42         int verbosity;
  43         unsigned buffer_output; /* 1: output at end, 2: keep buffered */
  44         struct strbuf obuf;     /* output buffer; if buffer_output == 2, caller
  45                                  * must handle and call strbuf_release */
  46
  47         /* miscellaneous control options */
  48         const char *subtree_shift;
  49         unsigned renormalize : 1;
  50         unsigned record_conflict_msgs_as_headers : 1;
  51         const char *msg_header_prefix;
  52
  53         /* internal fields used by the implementation */
  54         struct merge_options_internal *priv;
  55 };
  56
  57 void init_merge_options(struct merge_options *opt, struct repository *repo);
  58
  59 void copy_merge_options(struct merge_options *dst, struct merge_options *src);
  60 void clear_merge_options(struct merge_options *opt);
  61
  62 /* parse the option in s and update the relevant field of opt */
  63 int parse_merge_opt(struct merge_options *opt, const char *s);
  64
  65 /*
  66  * RETURN VALUES: All the merge_* functions below return a value as follows:
  67  *   > 0     Merge was clean
  68  *   = 0     Merge had conflicts
  69  *   < 0     Merge hit an unexpected and unrecoverable problem (e.g. disk
  70  *             full) and aborted merge part-way through.
  71  */
  72
  73 /*
  74  * rename-detecting three-way merge, no recursion.
  75  *
  76  * Outputs:
  77  *   - See RETURN VALUES above
  78  *   - opt->repo->index has the new index
  79  *   - new index NOT written to disk
  80  *   - The working tree is updated with results of the merge
  81  */
  82 int merge_trees(struct merge_options *opt,
  83                 struct tree *head,
  84                 struct tree *merge,
  85                 struct tree *merge_base);
  86
  87 /*
  88  * merge_recursive is like merge_trees() but with recursive ancestor
  89  * consolidation.
  90  *
  91  * NOTE: empirically, about a decade ago it was determined that with more
  92  *       than two merge bases, optimal behavior was found when the
  93  *       merge_bases were passed in the order of oldest commit to newest
  94  *       commit.  Also, merge_bases will be consumed (emptied) so make a
  95  *       copy if you need it.
  96  *
  97  * Outputs:
  98  *   - See RETURN VALUES above
  99  *   - *result is treated as scratch space for temporary recursive merges
 100  *   - opt->repo->index has the new index
 101  *   - new index NOT written to disk
 102  *   - The working tree is updated with results of the merge
 103  */
 104 int merge_recursive(struct merge_options *opt,
 105                     struct commit *h1,
 106                     struct commit *h2,
 107                     const struct commit_list *merge_bases,
 108                     struct commit **result);
 109
 110 /*
 111  * merge_recursive_generic can operate on trees instead of commits, by
 112  * wrapping the trees into virtual commits, and calling merge_recursive().
 113  * It also writes out the in-memory index to disk if the merge is successful.
 114  *
 115  * Outputs:
 116  *   - See RETURN VALUES above
 117  *   - *result is treated as scratch space for temporary recursive merges
 118  *   - opt->repo->index has the new index
 119  *   - new index also written to $GIT_INDEX_FILE on disk
 120  *   - The working tree is updated with results of the merge
 121  */
 122 int merge_recursive_generic(struct merge_options *opt,
 123                             const struct object_id *head,
 124                             const struct object_id *merge,
 125                             int num_merge_bases,
 126                             const struct object_id *merge_bases,
 127                             struct commit **result);
 128
 129 #endif