f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
102 lines
3 KiB
C
102 lines
3 KiB
C
/*
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* Low level 3-way in-core file merge.
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*/
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#ifndef LL_MERGE_H
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#define LL_MERGE_H
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#include "xdiff/xdiff.h"
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/**
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*
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* Calling sequence:
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* ----------------
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*
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* - Prepare a `struct ll_merge_options` to record options.
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* If you have no special requests, skip this and pass `NULL`
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* as the `opts` parameter to use the default options.
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*
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* - Allocate an mmbuffer_t variable for the result.
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*
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* - Allocate and fill variables with the file's original content
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* and two modified versions (using `read_mmfile`, for example).
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*
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* - Call `ll_merge()`.
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*
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* - Read the merged content from `result_buf.ptr` and `result_buf.size`.
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*
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* - Release buffers when finished. A simple
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* `free(ancestor.ptr); free(ours.ptr); free(theirs.ptr);
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* free(result_buf.ptr);` will do.
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*
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* If the modifications do not merge cleanly, `ll_merge` will return a
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* nonzero value and `result_buf` will generally include a description of
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* the conflict bracketed by markers such as the traditional `<<<<<<<`
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* and `>>>>>>>`.
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*
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* The `ancestor_label`, `our_label`, and `their_label` parameters are
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* used to label the different sides of a conflict if the merge driver
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* supports this.
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*/
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struct index_state;
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/**
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* This describes the set of options the calling program wants to affect
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* the operation of a low-level (single file) merge.
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*/
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struct ll_merge_options {
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/**
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* Behave as though this were part of a merge between common ancestors in
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* a recursive merge (merges of binary files may need to be handled
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* differently in such cases, for example). If a helper program is
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* specified by the `[merge "<driver>"] recursive` configuration, it will
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* be used.
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*/
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unsigned virtual_ancestor : 1;
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/**
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* Resolve local conflicts automatically in favor of one side or the other
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* (as in 'git merge-file' `--ours`/`--theirs`/`--union`). Can be `0`,
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* `XDL_MERGE_FAVOR_OURS`, `XDL_MERGE_FAVOR_THEIRS`,
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* or `XDL_MERGE_FAVOR_UNION`.
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*/
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unsigned variant : 2;
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/**
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* Resmudge and clean the "base", "theirs" and "ours" files before merging.
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* Use this when the merge is likely to have overlapped with a change in
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* smudge/clean or end-of-line normalization rules.
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*/
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unsigned renormalize : 1;
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/**
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* Increase the length of conflict markers so that nested conflicts
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* can be differentiated.
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*/
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unsigned extra_marker_size;
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/* Extra xpparam_t flags as defined in xdiff/xdiff.h. */
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long xdl_opts;
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};
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/**
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* Perform a three-way single-file merge in core. This is a thin wrapper
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* around `xdl_merge` that takes the path and any merge backend specified in
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* `.gitattributes` or `.git/info/attributes` into account.
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* Returns 0 for a clean merge.
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*/
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int ll_merge(mmbuffer_t *result_buf,
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const char *path,
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mmfile_t *ancestor, const char *ancestor_label,
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mmfile_t *ours, const char *our_label,
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mmfile_t *theirs, const char *their_label,
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struct index_state *istate,
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const struct ll_merge_options *opts);
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int ll_merge_marker_size(struct index_state *istate, const char *path);
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void reset_merge_attributes(void);
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#endif
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