// GetFirstCommit returns the first commit that is included in the review
func (r DifferentialReview) GetFirstCommit(repo repository.Repo) string {
var commits []string
for _, hashPair := range r.Hashes {
// We only care about the hashes for commits, which have exactly two
// elements, the first of which is "gtcm".
if len(hashPair) == 2 && hashPair[0] == commitHashType {
commits = append(commits, hashPair[1])
}
}
var commitTimestamps []int
commitsByTimestamp := make(map[int]string)
for _, commit := range commits {
if _, err := repo.GetLastParent(commit); err == nil {
timeString, err1 := repo.GetCommitTime(commit)
timestamp, err2 := strconv.Atoi(timeString)
if err1 == nil && err2 == nil {
commitTimestamps = append(commitTimestamps, timestamp)
// If there are multiple, equally old commits, then the last one wins.
commitsByTimestamp[timestamp] = commit
}
}
}
if len(commitTimestamps) == 0 {
return ""
}
sort.Ints(commitTimestamps)
revision := commitsByTimestamp[commitTimestamps[0]]
return revision
}