diff options
Diffstat (limited to 'll-merge.h')
| -rw-r--r-- | ll-merge.h | 75 |
1 files changed, 74 insertions, 1 deletions
@@ -7,15 +7,87 @@ #include "xdiff/xdiff.h" +/** + * + * Calling sequence: + * ---------------- + * + * - Prepare a `struct ll_merge_options` to record options. + * If you have no special requests, skip this and pass `NULL` + * as the `opts` parameter to use the default options. + * + * - Allocate an mmbuffer_t variable for the result. + * + * - Allocate and fill variables with the file's original content + * and two modified versions (using `read_mmfile`, for example). + * + * - Call `ll_merge()`. + * + * - Read the merged content from `result_buf.ptr` and `result_buf.size`. + * + * - Release buffers when finished. A simple + * `free(ancestor.ptr); free(ours.ptr); free(theirs.ptr); + * free(result_buf.ptr);` will do. + * + * If the modifications do not merge cleanly, `ll_merge` will return a + * nonzero value and `result_buf` will generally include a description of + * the conflict bracketed by markers such as the traditional `<<<<<<<` + * and `>>>>>>>`. + * + * The `ancestor_label`, `our_label`, and `their_label` parameters are + * used to label the different sides of a conflict if the merge driver + * supports this. + */ + + struct index_state; +/** + * This describes the set of options the calling program wants to affect + * the operation of a low-level (single file) merge. + */ struct ll_merge_options { + + /** + * Behave as though this were part of a merge between common ancestors in + * a recursive merge (merges of binary files may need to be handled + * differently in such cases, for example). If a helper program is + * specified by the `[merge "<driver>"] recursive` configuration, it will + * be used. + */ unsigned virtual_ancestor : 1; - unsigned variant : 2; /* favor ours, favor theirs, or union merge */ + + /** + * Resolve local conflicts automatically in favor of one side or the other + * (as in 'git merge-file' `--ours`/`--theirs`/`--union`). Can be `0`, + * `XDL_MERGE_FAVOR_OURS`, `XDL_MERGE_FAVOR_THEIRS`, + * or `XDL_MERGE_FAVOR_UNION`. + */ + unsigned variant : 2; + + /** + * Resmudge and clean the "base", "theirs" and "ours" files before merging. + * Use this when the merge is likely to have overlapped with a change in + * smudge/clean or end-of-line normalization rules. + */ unsigned renormalize : 1; + + /** + * Increase the length of conflict markers so that nested conflicts + * can be differentiated. + */ + unsigned extra_marker_size; + + /* Extra xpparam_t flags as defined in xdiff/xdiff.h. */ long xdl_opts; }; +/** + * Perform a three-way single-file merge in core. This is a thin wrapper + * around `xdl_merge` that takes the path and any merge backend specified in + * `.gitattributes` or `.git/info/attributes` into account. + * Returns 0 for a clean merge. + */ int ll_merge(mmbuffer_t *result_buf, const char *path, mmfile_t *ancestor, const char *ancestor_label, @@ -25,5 +97,6 @@ int ll_merge(mmbuffer_t *result_buf, const struct ll_merge_options *opts); int ll_merge_marker_size(struct index_state *istate, const char *path); +void reset_merge_attributes(void); #endif |