static async Task <LaunchResult> InnerLaunch(ResolvedTool tool, string tempFile, string targetFile)
{
var arguments = tool.Arguments(tempFile, targetFile);
var command = tool.BuildCommand(tempFile, targetFile);
if (ProcessCleanup.TryGetProcessInfo(command, out var processCommand))
{
if (tool.AutoRefresh)
{
await DiffEngineTray.AddMove(tempFile, targetFile, tool.ExePath, arguments, tool.IsMdi !, processCommand.Process, processCommand.StartTime);
return(LaunchResult.AlreadyRunningAndSupportsRefresh);
}
if (!tool.IsMdi)
{
ProcessCleanup.Kill(command);
}
}
var instanceCount = Interlocked.Increment(ref launchedInstances);
if (instanceCount > maxInstancesToLaunch)
{
await DiffEngineTray.AddMove(tempFile, targetFile, tool.ExePath, arguments, tool.IsMdi !, null, null);
return(LaunchResult.TooManyRunningDiffTools);
}
try
{
var startInfo = new ProcessStartInfo(tool.ExePath, arguments)
{
UseShellExecute = true
};
using var process = Process.Start(startInfo);
if (process == null)
{
var message = $@"Failed to launch diff tool.
{tool.ExePath} {arguments}";
throw new Exception(message);
}
await DiffEngineTray.AddMove(tempFile, targetFile, tool.ExePath, arguments, !tool.IsMdi, process.Id, process.StartTime);
return(LaunchResult.StartedNewInstance);
}
catch (Exception exception)
{
var message = $@"Failed to launch diff tool.
{tool.ExePath} {arguments}";
throw new Exception(message, exception);
}
}
public static Task <LaunchResult> LaunchAsync(ResolvedTool tool, string tempFile, string targetFile)
{
GuardFiles(tempFile, targetFile);
Guard.AgainstNull(tool, nameof(tool));
return(InnerLaunchAsync(
(out ResolvedTool? resolvedTool) =>
{
resolvedTool = tool;
return true;
},
tempFile,
targetFile));
}
static bool TryCreate(ResolvedTool tool, string targetFile)
{
var targetExists = File.Exists(targetFile);
if (tool.RequiresTarget && !targetExists)
{
if (!AllFiles.TryCreateFile(targetFile, useEmptyStringForTextFiles: true))
{
return(false);
}
}
return(true);
}
public static Task <LaunchResult> Launch(ResolvedTool tool, string tempFile, string targetFile)
{
GuardFiles(tempFile, targetFile);
Guard.AgainstNull(tool, nameof(tool));
if (Disabled)
{
return(Task.FromResult(LaunchResult.Disabled));
}
var targetExists = File.Exists(targetFile);
if (tool.RequiresTarget && !targetExists)
{
if (!AllFiles.TryCreateFile(targetFile, useEmptyStringForTextFiles: true))
{
return(Task.FromResult(LaunchResult.NoEmptyFileForExtension));
}
}
return(InnerLaunch(tool, tempFile, targetFile));
}