/// <summary>
/// Parse the output of calling git ls-tree
/// </summary>
/// <param name="line">A line that was output from calling git ls-tree</param>
/// <returns>A DiffTreeResult build from the output line</returns>
/// <remarks>
/// The call to ls-tree could be any of the following
/// git ls-tree (treeish)
/// git ls-tree -r (treeish)
/// git ls-tree -t (treeish)
/// git ls-tree -r -t (treeish)
/// </remarks>
public static DiffTreeResult ParseFromLsTreeLine(string line)
{
if (string.IsNullOrEmpty(line))
{
throw new ArgumentException("Line to parse cannot be null or empty", nameof(line));
}
/*
* Example output lines from ls-tree
*
* 040000 tree 73b881d52b607b0f3e9e620d36f556d3d233a11d\tScalar
* 100644 blob 44c5f5cba4b29d31c2ad06eed51ea02af76c27c0\tReadme.md
* 100755 blob 196142fbb753c0a3c7c6690323db7aa0a11f41ec\tScripts/BuildScalarForMac.sh
* ^-mode ^-marker ^-tab
* ^-sha ^-path
*/
// Everything from ls-tree is an add.
if (IsLsTreeLineOfType(line, TreeMarker))
{
DiffTreeResult treeAdd = new DiffTreeResult();
treeAdd.TargetIsDirectory = true;
treeAdd.TargetPath = AppendPathSeparatorIfNeeded(ConvertPathToUtf8Path(line.Substring(line.LastIndexOf("\t") + 1)));
treeAdd.Operation = DiffTreeResult.Operations.Add;
return(treeAdd);
}
else
{
if (IsLsTreeLineOfType(line, BlobMarker))
{
DiffTreeResult blobAdd = new DiffTreeResult();
blobAdd.TargetMode = Convert.ToUInt16(line.Substring(0, 6), 8);
blobAdd.TargetIsSymLink = blobAdd.TargetMode == SymLinkFileIndexEntry;
blobAdd.TargetSha = line.Substring(TypeMarkerStartIndex + BlobMarker.Length, ScalarConstants.ShaStringLength);
blobAdd.TargetPath = ConvertPathToUtf8Path(line.Substring(line.LastIndexOf("\t") + 1));
blobAdd.Operation = DiffTreeResult.Operations.Add;
return(blobAdd);
}
else
{
return(null);
}
}
}
public static DiffTreeResult ParseFromDiffTreeLine(string line)
{
if (string.IsNullOrEmpty(line))
{
throw new ArgumentException("Line to parse cannot be null or empty", nameof(line));
}
/*
* The lines passed to this method should be the result of a call to git diff-tree -r -t (sourceTreeish) (targetTreeish)
*
* Example output lines from git diff-tree
* :000000 040000 0000000000000000000000000000000000000000 cee82f9d431bf610404f67bcdda3fee76f0c1dd5 A\tScalar/FastFetch/Git
* :000000 100644 0000000000000000000000000000000000000000 cdc036f9d561f14d908e0a0c337105b53c778e5e A\tScalar/FastFetch/Git/FastFetchGitObjects.cs
* :040000 000000 f68b90da732791438d67c0326997a2d26e4c2de4 0000000000000000000000000000000000000000 D\tScalar/Scalar.CLI
* :100644 000000 1242fc97c612ff286a5f1221d569508600ca5e06 0000000000000000000000000000000000000000 D\tScalar/Scalar.CLI/Scalar.CLI.csproj
* :040000 040000 3823348f91113a619eed8f48fe597cc9c7d088d8 fd56ff77b12a0b76567cb55ed4950272eac8b8f6 M\tScalar/Scalar.Common
* :100644 100644 57d9c737c8a48632cfbb12cae00c97d512b9f155 524d7dbcebd33e4007c52711d3f21b17373de454 M\tScalar/Scalar.Common/Scalar.Common.csproj
* ^-[0] ^-[1] ^-[2] ^-[3] ^-[4]
* ^-tab
* ^-[5]
*
* This output will only happen if -C or -M is passed to the diff-tree command
* Since we are not passing those options we shouldn't have to handle this format.
* :100644 100644 3ac7d60a25bb772af1d5843c76e8a070c062dc5d c31a95125b8a6efd401488839a7ed1288ce01634 R094\tScalar/Scalar.CLI/CommandLine/CloneVerb.cs\tScalar/Scalar/CommandLine/CloneVerb.cs
*/
if (!line.StartsWith(":"))
{
throw new ArgumentException($"diff-tree lines should start with a :", nameof(line));
}
// Skip the colon at the front
line = line.Substring(1);
// Filenames may contain spaces, but always follow a \t. Other fields are space delimited.
// Splitting on \t will give us the mode, sha, operation in parts[0] and that path in parts[1] and optionally in paths[2]
string[] parts = line.Split(new[] { '\t' }, count: 2);
// Take the mode, sha, operation part and split on a space then add the paths that were split on a tab to the end
parts = parts[0].Split(' ').Concat(parts.Skip(1)).ToArray();
if (parts.Length != 6 ||
parts[5].Contains('\t'))
{
// Look at file history to see how -C -M with 7 parts could be handled
throw new ArgumentException($"diff-tree lines should have 6 parts unless passed -C or -M which this method doesn't handle", nameof(line));
}
DiffTreeResult result = new DiffTreeResult();
result.SourceIsDirectory = ValidTreeModes.Contains(parts[0]);
result.TargetIsDirectory = ValidTreeModes.Contains(parts[1]);
result.SourceMode = Convert.ToUInt16(parts[0], 8);
result.TargetMode = Convert.ToUInt16(parts[1], 8);
if (!result.TargetIsDirectory)
{
result.TargetIsSymLink = result.TargetMode == SymLinkFileIndexEntry;
}
result.SourceSha = parts[2];
result.TargetSha = parts[3];
result.Operation = DiffTreeResult.ParseOperation(parts[4]);
result.TargetPath = ConvertPathToUtf8Path(parts[5]);
if (result.TargetIsDirectory || result.SourceIsDirectory)
{
// Since diff-tree is not doing rename detection, file->directory or directory->file transformations are always multiple lines
// with a delete line and an add line
// :000000 040000 0000000000000000000000000000000000000000 cee82f9d431bf610404f67bcdda3fee76f0c1dd5 A\tScalar/FastFetch/Git
// :040000 040000 3823348f91113a619eed8f48fe597cc9c7d088d8 fd56ff77b12a0b76567cb55ed4950272eac8b8f6 M\tScalar/Scalar.Common
// :040000 000000 f68b90da732791438d67c0326997a2d26e4c2de4 0000000000000000000000000000000000000000 D\tScalar/Scalar.CLI
result.TargetPath = AppendPathSeparatorIfNeeded(result.TargetPath);
}
return(result);
}
