fix<CommitViewer>: fix save revision file to path error when selected file is managed by LFS

src/Git/Commit.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Text.RegularExpressions;
@@ -261,6 +262,39 @@ namespace SourceGit.Git {
             return string.Join("\n", data);
         }
 
+        /// <summary>
+        ///     Save file to.
+        /// </summary>
+        /// <param name="repo"></param>
+        /// <param name="file"></param>
+        /// <param name="saveTo"></param>
+        public void SaveFileTo(Repository repo, string file, string saveTo) {
+            var tmp = Path.GetTempFileName();
+            var bat = tmp + ".bat";
+            var cmd = "";
+
+            if (repo.IsLFSFiltered(file)) {
+                cmd += $"git --no-pager show {SHA}:\"{file}\" > {tmp}.lfs\n";
+                cmd += $"git --no-pager lfs smudge < {tmp}.lfs > {saveTo}\n";
+            } else {
+                cmd = $"git --no-pager show {SHA}:\"{file}\" > {saveTo}\n";
+            }
+
+            File.WriteAllText(bat, cmd);
+
+            var starter = new ProcessStartInfo();
+            starter.FileName = bat;
+            starter.WorkingDirectory = repo.Path;
+            starter.CreateNoWindow = true;
+            starter.WindowStyle = ProcessWindowStyle.Hidden;
+
+            var proc = Process.Start(starter);
+            proc.WaitForExit();
+            proc.Close();
+
+            File.Delete(bat);
+        }
+
         private static void ParseSHA(Commit commit, string data) {
             var decoratorStart = data.IndexOf('(');
             if (decoratorStart < 0) {

src/Git/Repository.cs

@@ -184,32 +184,6 @@ namespace SourceGit.Git {
             return RunCommand(Path, args, outputHandler, includeError);
         }
 
-        /// <summary>
-        ///     Create process and redirect output to file.
-        /// </summary>
-        /// <param name="args">Git command arguments.</param>
-        /// <param name="redirectTo">File path to redirect output into.</param>
-        public void RunAndRedirect(string args, string redirectTo) {
-            var startInfo = new ProcessStartInfo();
-            startInfo.FileName = Preference.Instance.GitExecutable;
-            startInfo.Arguments = "--no-pager " + args;
-            startInfo.WorkingDirectory = Path;
-            startInfo.UseShellExecute = false;
-            startInfo.CreateNoWindow = true;
-            startInfo.RedirectStandardOutput = true;
-            startInfo.RedirectStandardError = true;
-
-            var proc = new Process() { StartInfo = startInfo };
-            proc.Start();
-
-            using (var writer = new FileStream(redirectTo, FileMode.OpenOrCreate)) {
-                proc.StandardOutput.BaseStream.CopyTo(writer);
-            }
-
-            proc.WaitForExit();
-            proc.Close();
-        }
-
         /// <summary>
         ///     Assert command result and then update branches and commits.
         /// </summary>

src/UI/CommitViewer.xaml.cs

@@ -298,12 +298,12 @@ namespace SourceGit.UI {
                 saveAs.Header = "Save As ...";
                 saveAs.Click += (obj, ev) => {
                     var dialog = new System.Windows.Forms.FolderBrowserDialog();
-                    dialog.Description = change.Path;
+                    dialog.Description = path;
                     dialog.ShowNewFolderButton = true;
 
                     if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
                         var savePath = Path.Combine(dialog.SelectedPath, Path.GetFileName(path));
-                        repo.RunAndRedirect($"show {commit.SHA}:\"{path}\"", savePath);
+                        commit.SaveFileTo(repo, path, savePath);
                     }
                 };
                 menu.Items.Add(saveAs);
@@ -526,7 +526,7 @@ namespace SourceGit.UI {
 
                     if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
                         var path = Path.Combine(dialog.SelectedPath, node.Name);
-                        repo.RunAndRedirect($"show {commit.SHA}:\"{node.FilePath}\"", path);
+                        commit.SaveFileTo(repo, node.FilePath, path);
                     }
                 };
                 menu.Items.Add(saveAs);