Function performRebase

lib/repository.js:213–319

* Goes through a rebase's rebase operations and commits them if there are * no merge conflicts * * @param {Repository} repository The repository that the rebase is being * performed in * @param {Rebase} rebase The current rebase being performed

(
  repository,
  rebase,
  signature,
  beforeNextFn,
  beforeFinishFn
)

 *                     a rebase with conflicts
 */
function performRebase(
  repository,
  rebase,
  signature,
  beforeNextFn,
  beforeFinishFn
) {
  var beforeNextFnResult;

  /* In the case of FF merges and a beforeFinishFn, this will fail
   * when looking for 'rewritten' so we need to handle that case.
   */
  function readRebaseMetadataFile(fileName, continueOnError) {
    return fse.readFile(
      path.join(repository.path(), "rebase-merge", fileName),
      { encoding: "utf8" }
    )
      .then(fp.trim)
      .catch(function(err) {
        if (continueOnError) {
          return null;
        }
        throw err;
      });
  }

  function calcHeadName(input) {
    return input.replace(/refs\/heads\/(.*)/, "$1");
  }

  function getPromise() {
    return rebase.next()
      .then(function() {
        return repository.refreshIndex();
      })
      .then(function(index) {
        if (index.hasConflicts()) {
          throw index;
        }

        return rebase.commit(null, signature);
      })
      .then(function() {

        return performRebase(
          repository,
          rebase,
          signature,
          beforeNextFn,
          beforeFinishFn
        );
      })
      .catch(function(error) {
        if (error && error.errno === NodeGit.Error.CODE.ITEROVER) {
          const calcRewritten = fp.cond([
            [fp.isEmpty, fp.constant(null)],
            [fp.stubTrue, fp.flow([
              fp.split("\n"),