/// <summary>
/// View the changes between the revisions, if possible as a diff.
/// </summary>
/// <param name="fileViewer">Current FileViewer.</param>
/// <param name="item">The FileStatusItem to present changes for.</param>
/// <param name="defaultText">default text if no diff is possible.</param>
/// <param name="openWithDiffTool">The difftool command to open with.</param>
/// <returns>Task to view.</returns>
public static async Task ViewChangesAsync(this FileViewer fileViewer,
FileStatusItem?item,
CancellationToken cancellationToken,
string defaultText = "",
Action?openWithDiffTool = null)
{
if (item?.Item.IsStatusOnly ?? false)
{
// Present error (e.g. parsing Git)
await fileViewer.ViewTextAsync(item.Item.Name, item.Item.ErrorMessage ?? "");
return;
}
if (item?.Item is null || item.SecondRevision?.ObjectId is null)
{
if (!string.IsNullOrWhiteSpace(defaultText))
{
await fileViewer.ViewTextAsync(item?.Item?.Name, defaultText);
return;
}
await fileViewer.ClearAsync();
return;
}
var firstId = item.FirstRevision?.ObjectId ?? item.SecondRevision.FirstParentId;
openWithDiffTool ??= OpenWithDiffTool;
if (item.Item.IsNew || firstId is null || (!item.Item.IsDeleted && FileHelper.IsImage(item.Item.Name)))
{
// View blob guid from revision, or file for worktree
await fileViewer.ViewGitItemAsync(item, openWithDiffTool);
return;
}
if (item.Item.IsRangeDiff)
{
// Git range-diff has cubic runtime complexity and can be slow and memory consuming,
// give an indication of what is going on
string range = item.BaseA is null || item.BaseB is null
? $"{firstId}...{item.SecondRevision.ObjectId}"
: $"{item.BaseA}..{firstId} {item.BaseB}..{item.SecondRevision.ObjectId}";
await fileViewer.ViewTextAsync("git-range-diff.sh", $"git range-diff {range}");
string output = await fileViewer.Module.GetRangeDiffAsync(
firstId,
item.SecondRevision.ObjectId,
item.BaseA,
item.BaseB,
fileViewer.GetExtraDiffArguments(isRangeDiff: true),
cancellationToken);
// Try set highlighting from first found filename
Match match = new Regex(@"\n\s*(@@|##)\s+(?<file>[^#:\n]+)").Match(output ?? "");
string filename = match.Groups["file"].Success ? match.Groups["file"].Value : item.Item.Name;
cancellationToken.ThrowIfCancellationRequested();
await fileViewer.ViewRangeDiffAsync(filename, output ?? defaultText);
return;
}
string selectedPatch = (await GetSelectedPatchAsync(fileViewer, firstId, item.SecondRevision.ObjectId, item.Item, cancellationToken))
?? defaultText;
cancellationToken.ThrowIfCancellationRequested();
if (item.Item.IsSubmodule)
{
await fileViewer.ViewTextAsync(item.Item.Name, text : selectedPatch, openWithDifftool : openWithDiffTool);
}
else
{
await fileViewer.ViewPatchAsync(item, text : selectedPatch, openWithDifftool : openWithDiffTool);
}
return;
void OpenWithDiffTool()
{
fileViewer.Module.OpenWithDifftool(
item.Item.Name,
item.Item.OldName,
firstId?.ToString(),
item.SecondRevision.ToString(),
isTracked: item.Item.IsTracked);
}