|  | merge API | 
|  | ========= | 
|  |  | 
|  | The merge API helps a program to reconcile two competing sets of | 
|  | improvements to some files (e.g., unregistered changes from the work | 
|  | tree versus changes involved in switching to a new branch), reporting | 
|  | conflicts if found.  The library called through this API is | 
|  | responsible for a few things. | 
|  |  | 
|  | * determining which trees to merge (recursive ancestor consolidation); | 
|  |  | 
|  | * lining up corresponding files in the trees to be merged (rename | 
|  | detection, subtree shifting), reporting edge cases like add/add | 
|  | and rename/rename conflicts to the user; | 
|  |  | 
|  | * performing a three-way merge of corresponding files, taking | 
|  | path-specific merge drivers (specified in `.gitattributes`) | 
|  | into account. | 
|  |  | 
|  | Data structures | 
|  | --------------- | 
|  |  | 
|  | * `mmbuffer_t`, `mmfile_t` | 
|  |  | 
|  | These store data usable for use by the xdiff backend, for writing and | 
|  | for reading, respectively.  See `xdiff/xdiff.h` for the definitions | 
|  | and `diff.c` for examples. | 
|  |  | 
|  | * `struct ll_merge_options` | 
|  |  | 
|  | Check merge-ll.h for details. | 
|  |  | 
|  | Low-level (single file) merge | 
|  | ----------------------------- | 
|  |  | 
|  | Check merge-ll.h for details. |