public static bool TryGet(
IReadOnlyList <GitRevision> revisions,
RevisionDiffKind diffKind,
out string extraDiffArgs,
out string firstRevision,
out string secondRevision,
out string error)
{
// NOTE Order in revisions is that first clicked is last in array
// Detect rename and copy
extraDiffArgs = "-M -C";
if (revisions == null)
{
error = "Unexpected null revision argument to difftool";
firstRevision = null;
secondRevision = null;
return(false);
}
if (revisions.Count == 0 || revisions.Count > 2)
{
error = "Unexpected number of arguments to difftool: " + revisions.Count;
firstRevision = null;
secondRevision = null;
return(false);
}
if (revisions[0] == null || (revisions.Count == 2 && revisions[1] == null))
{
error = "Unexpected single null argument to difftool";
firstRevision = null;
secondRevision = null;
return(false);
}
if (diffKind == RevisionDiffKind.DiffAB)
{
firstRevision = revisions.Count == 1
? GetParentRef(revisions[0])
: revisions[1].Guid;
secondRevision = revisions[0].Guid;
}
else
{
// Second revision is always local
secondRevision = null;
if (diffKind == RevisionDiffKind.DiffBLocal)
{
firstRevision = revisions[0].Guid;
}
else if (diffKind == RevisionDiffKind.DiffBParentLocal)
{
firstRevision = GetParentRef(revisions[0]);
}
else if (revisions.Count == 1)
{
if (diffKind == RevisionDiffKind.DiffALocal)
{
firstRevision = GetParentRef(revisions[0]);
}
else if (diffKind == RevisionDiffKind.DiffAParentLocal)
{
firstRevision = GetParentRef(revisions[0]) + "^";
}
else
{
firstRevision = null;
error = "Unexpected arg to difftool with one revision: " + diffKind;
return(false);
}
}
else if (diffKind == RevisionDiffKind.DiffALocal)
{
firstRevision = revisions[1].Guid;
}
else if (diffKind == RevisionDiffKind.DiffAParentLocal)
{
firstRevision = GetParentRef(revisions[1]);
}
else
{
firstRevision = null;
error = "Unexpected arg to difftool with two revisions: " + diffKind;
return(false);
}
}
error = null;
return(true);
string GetParentRef(GitRevision revision)
{
return(revision.FirstParentGuid?.ToString() ?? revision.Guid + '^');
}
}
public static bool TryGet(
IReadOnlyList <GitRevision> revisions,
RevisionDiffKind diffKind,
out string firstRevision,
out string secondRevision,
out string error)
{
// NOTE Order in revisions is that first clicked is last in array
if (revisions == null)
{
error = "Unexpected null revision argument to difftool";
firstRevision = null;
secondRevision = null;
return(false);
}
if (revisions.Count == 0 || revisions.Count > 2)
{
error = "Unexpected number of arguments to difftool: " + revisions.Count;
firstRevision = null;
secondRevision = null;
return(false);
}
if (revisions[0] == null)
{
error = "Unexpected single null argument to difftool";
firstRevision = null;
secondRevision = null;
return(false);
}
if (revisions.Count == 2 && revisions[1] == null && diffKind == RevisionDiffKind.DiffBLocal)
{
error = "Unexpected second null argument to difftool for DiffB";
firstRevision = null;
secondRevision = null;
return(false);
}
if (diffKind == RevisionDiffKind.DiffAB)
{
// If revisions[1]?.Guid is null, the "commit before the initial" is used as firstRev
firstRevision = revisions.Count == 1
? GetParentRef(revisions[0])
: revisions[1]?.Guid ?? "--root";
secondRevision = revisions[0].Guid;
}
else
{
// Second revision is always local
secondRevision = null;
if (diffKind == RevisionDiffKind.DiffBLocal)
{
firstRevision = revisions[0].Guid;
}
else if (revisions.Count == 1)
{
if (diffKind == RevisionDiffKind.DiffALocal)
{
firstRevision = GetParentRef(revisions[0]);
}
else
{
firstRevision = null;
error = "Unexpected arg to difftool with one revision: " + diffKind;
return(false);
}
}
else if (diffKind == RevisionDiffKind.DiffALocal)
{
firstRevision = revisions[1]?.Guid ?? "--root";
}
else
{
firstRevision = null;
error = "Unexpected arg to difftool with two revisions: " + diffKind;
return(false);
}
}
error = null;
return(true);
/// <summary>
/// One row selected:
/// B - Selected row
/// A - B's parent
///
/// Two rows selected:
/// A - first selected row
/// B - second selected row
/// </summary>
public static string Get(IList <GitRevision> revisions, RevisionDiffKind diffKind,
out string extraDiffArgs, out string firstRevision, out string secondRevision)
{
// Note: Order in revisions is that first clicked is last in array
string error = "";
// Detect rename and copy
extraDiffArgs = "-M -C";
if (revisions == null)
{
error = "Unexpected null revision argument to difftool";
firstRevision = null;
secondRevision = null;
}
else if (revisions.Count == 0 || revisions.Count > 2)
{
error = "Unexpected number of arguments to difftool: " + revisions.Count;
firstRevision = null;
secondRevision = null;
}
else if (revisions[0] == null || (revisions.Count > 1 && revisions[1] == null))
{
error = "Unexpected single null argument to difftool";
firstRevision = null;
secondRevision = null;
}
else if (diffKind == RevisionDiffKind.DiffAB)
{
if (revisions.Count == 1)
{
firstRevision = revisions[0].FirstParentGuid ?? revisions[0].Guid + '^';
}
else
{
firstRevision = revisions[1].Guid;
}
secondRevision = revisions[0].Guid;
}
else
{
// Second revision is always local
secondRevision = null;
if (diffKind == RevisionDiffKind.DiffBLocal)
{
firstRevision = revisions[0].Guid;
}
else if (diffKind == RevisionDiffKind.DiffBParentLocal)
{
firstRevision = revisions[0].FirstParentGuid ?? revisions[0].Guid + '^';
}
else
{
firstRevision = revisions[0].Guid;
if (revisions.Count == 1)
{
if (diffKind == RevisionDiffKind.DiffALocal)
{
firstRevision = revisions[0].FirstParentGuid ?? revisions[0].Guid + '^';
}
else if (diffKind == RevisionDiffKind.DiffAParentLocal)
{
firstRevision = (revisions[0].FirstParentGuid ?? revisions[0].Guid + '^') + "^";
}
else
{
error = "Unexpected arg to difftool with one revision: " + diffKind;
}
}
else
{
if (diffKind == RevisionDiffKind.DiffALocal)
{
firstRevision = revisions[1].Guid;
}
else if (diffKind == RevisionDiffKind.DiffAParentLocal)
{
firstRevision = revisions[1].FirstParentGuid ?? revisions[1].Guid + '^';
}
else
{
error = "Unexpected arg to difftool with two revisions: " + diffKind;
}
}
}
}
return(error);
}