/// <summary>
/// Creates a commit object that represents the current
/// state of the index, writes the commit to the `objects` directory
/// and points `HEAD` at the commit.
/// </summary>
public static string Commit(CommitOptions options)
{
Files.AssertInRepo();
Config.AssertNotBare();
// Write a tree object that represents the current state of the
// index.
var treeHash = WriteTree();
var headDesc = Refs.IsHeadDetached() ? "detached HEAD" : Refs.HeadBranchName();
// If the hash of the new tree is the same as the hash of the tree
// that the `HEAD` commit points at, abort because there is
// nothing new to commit.
if (Refs.Hash("HEAD") != null &&
treeHash == Objects.TreeHash(Objects.Read(Refs.Hash("HEAD"))))
{
throw new Exception("# On " + headDesc + "\nnothing to commit, working directory clean");
}
// Abort if the repository is in the merge state and there are
// unresolved merge conflicts.
string[] conflictedPaths = Index.ConflictedPaths();
if (Core.Merge.IsMergeInProgress() && conflictedPaths.Length > 0)
{
throw new Exception(
string.Join("\n", conflictedPaths.Select(p => "U " + p))
+ "\ncannot commit because you have unmerged files");
}
// Otherwise, do the commit.
// If the repository is in the merge state, use a pre-written
// merge commit message. If the repository is not in the
// merge state, use the message passed with `-m`.
var m =
Core.Merge.IsMergeInProgress()
? Files.Read(Path.Combine(Files.GitletPath(), "MERGE_MSG"))
: options.m;
// Write the new commit to the `objects` directory.
var commitHash = Objects.WriteCommit(treeHash, m, Refs.CommitParentHashes());
// Point `HEAD` at new commit.
UpdateRef("HEAD", commitHash);
// If `MERGE_HEAD` exists, the repository was in the merge
// state. Remove `MERGE_HEAD` and `MERGE_MSG`to exit the merge
// state. Report that the merge is complete.
if (Core.Merge.IsMergeInProgress())
{
File.Delete(Path.Combine(Files.GitletPath(), "MERGE_MSG"));
Refs.Rm("MERGE_HEAD");
return("Merge made by the three-way strategy");
}
// Repository was not in the merge state, so just report that
// the commit is complete.
return("[" + headDesc + " " + commitHash + "] " + m);
}