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39 changes: 33 additions & 6 deletions 39 lib/repository.js
Original file line number Diff line number Diff line change
Expand Up @@ -1325,11 +1325,19 @@ Repository.prototype.refreshIndex = function(callback) {
* @return {Oid|Index} A commit id for a succesful merge or an index for a
* merge with conflicts
*/
Repository.prototype.mergeBranches =
function(to, from, signature, mergePreference, mergeOptions) {
Repository.prototype.mergeBranches = function(
to,
from,
signature,
mergePreference,
mergeOptions,
processMergeMessageCallback
) {
var repo = this;
var fromBranch;
var toBranch;
processMergeMessageCallback = processMergeMessageCallback ||
function (message) { return message; };

mergePreference = mergePreference || NodeGit.Merge.PREFERENCE.NONE;
mergeOptions = normalizeOptions(mergeOptions, NodeGit.MergeOptions);
Expand Down Expand Up @@ -1414,19 +1422,38 @@ Repository.prototype.mergeBranches =
return index.writeTreeTo(repo);
})
.then(function(oid) {
var mergeDecorator;
if (fromBranch.isTag()) {
mergeDecorator = "tag";
} else if (fromBranch.isRemote()) {
mergeDecorator = "remote-tracking branch";
} else {
mergeDecorator = "branch";
}

var message =
"Merged " +
"Merge " +
mergeDecorator +
" '" +
fromBranch.shorthand() +
" into " +
toBranch.shorthand();
"'";

// https://github.com/git/git/blob/master/builtin/fmt-merge-msg.c#L456-L459
if (toBranch.shorthand() !== "master") {
message += " into " + toBranch.shorthand();
}

return Promise.all([oid, processMergeMessageCallback(message)]);
})
.then(function([oid, message]) {
return repo.createCommit(
toBranch.name(),
signature,
signature,
message,
oid,
[toCommitOid, fromCommitOid]);
[toCommitOid, fromCommitOid]
);
})
.then(function(commit) {
// we've updated the checked out branch, so make sure we update
Expand Down
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