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merge-tree: add option parsing and initial shell for real merge function

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Let merge-tree accept a `--write-tree` parameter for choosing real
merges instead of trivial merges, and accept an optional
`--trivial-merge` option to get the traditional behavior.  Note that
these accept different numbers of arguments, though, so these names
need not actually be used.

Note that real merges differ from trivial merges in that they handle:
  - three way content merges
  - recursive ancestor consolidation
  - renames
  - proper directory/file conflict handling
  - etc.
Basically all the stuff you'd expect from `git merge`, just without
updating the index and working tree.  The initial shell added here does
nothing more than die with "real merges are not yet implemented", but
that will be fixed in subsequent commits.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren
2022-06-18 00:20:46 +00:00
committed by Junio C Hamano
parent 55e48f6bf7
commit 6ec755a0e1
2 changed files with 76 additions and 10 deletions
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git.c
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@ -565,7 +565,7 @@ static struct cmd_struct commands[] = {
{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
{ "merge-tree", cmd_merge_tree, RUN_SETUP },
{ "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
{ "mktree", cmd_mktree, RUN_SETUP },
{ "multi-pack-index", cmd_multi_pack_index, RUN_SETUP },