mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
6723899932
A long term (but rather minor) pet-peeve of mine was the name
ll-merge.[ch]. I thought it made it harder to realize what stuff was
related to merging when I was working on the merge machinery and trying
to improve it.
Further, back in d1cbe1e6d8 ("hash-ll.h: split out of hash.h to remove
dependency on repository.h", 2023-04-22), we have split the portions of
hash.h that do not depend upon repository.h into a "hash-ll.h" (due to
the recommendation to use "ll" for "low-level" in its name[1], but which
I used as a suffix precisely because of my distaste for "ll-merge").
When we discussed adding additional "*-ll.h" files, a request was made
that we use "ll" consistently as either a prefix or a suffix. Since it
is already in use as both a prefix and a suffix, the only way to do so
is to rename some files.
Besides my distaste for the ll-merge.[ch] name, let me also note that
the files
ll-fsmonitor.h, ll-hash.h, ll-merge.h, ll-object-store.h, ll-read-cache.h
would have essentially nothing to do with each other and make no sense
to group. But giving them the common "ll-" prefix would group them. Using
"-ll" as a suffix thus seems just much more logical to me. Rename
ll-merge.[ch] to merge-ll.[ch] to achieve this consistency, and to
ensure we get a more logical grouping of files.
[1] https://lore.kernel.org/git/kl6lsfcu1g8w.fsf@chooglen-macbookpro.roam.corp.google.com/
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
|
||
* Low level 3-way in-core file merge.
|
||
*/
|
||
|
||
#ifndef LL_MERGE_H
|
||
#define LL_MERGE_H
|
||
|
||
#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;
|
||
|
||
/**
|
||
* 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;
|
||
};
|
||
|
||
enum ll_merge_result {
|
||
LL_MERGE_ERROR = -1,
|
||
LL_MERGE_OK = 0,
|
||
LL_MERGE_CONFLICT,
|
||
LL_MERGE_BINARY_CONFLICT,
|
||
};
|
||
|
||
/**
|
||
* 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.
|
||
*/
|
||
enum ll_merge_result ll_merge(mmbuffer_t *result_buf,
|
||
const char *path,
|
||
mmfile_t *ancestor, const char *ancestor_label,
|
||
mmfile_t *ours, const char *our_label,
|
||
mmfile_t *theirs, const char *their_label,
|
||
struct index_state *istate,
|
||
const struct ll_merge_options *opts);
|
||
|
||
int ll_merge_marker_size(struct index_state *istate, const char *path);
|
||
void reset_merge_attributes(void);
|
||
|
||
#endif
|