perf: minimize temporary strings for better performance (#1292)

Author: qiufengshe

src/Models/CommitLink.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace SourceGit.Models
@@ -22,24 +22,24 @@ public static List<CommitLink> Get(List<Remote> remotes)
             {
                 if (remote.TryGetVisitURL(out var url))
                 {
-                    var trimmedUrl = url;
+                    var trimmedUrl = url.AsSpan();
                     if (url.EndsWith(".git"))
-                        trimmedUrl = url.Substring(0, url.Length - 4);
+                        trimmedUrl = url.AsSpan().Slice(0, url.Length - 4);
 
                     if (url.StartsWith("https://github.com/", StringComparison.Ordinal))
-                        outs.Add(new($"Github ({trimmedUrl.Substring(19)})", $"{url}/commit/"));
+                        outs.Add(new($"Github ({trimmedUrl.Slice(19)})", $"{url}/commit/"));
                     else if (url.StartsWith("https://gitlab.", StringComparison.Ordinal))
-                        outs.Add(new($"GitLab ({trimmedUrl.Substring(trimmedUrl.Substring(15).IndexOf('/') + 16)})", $"{url}/-/commit/"));
+                        outs.Add(new($"GitLab ({trimmedUrl.Slice(trimmedUrl.Slice(15).IndexOf('/') + 16)})", $"{url}/-/commit/"));
                     else if (url.StartsWith("https://gitee.com/", StringComparison.Ordinal))
-                        outs.Add(new($"Gitee ({trimmedUrl.Substring(18)})", $"{url}/commit/"));
+                        outs.Add(new($"Gitee ({trimmedUrl.Slice(18)})", $"{url}/commit/"));
                     else if (url.StartsWith("https://bitbucket.org/", StringComparison.Ordinal))
-                        outs.Add(new($"BitBucket ({trimmedUrl.Substring(22)})", $"{url}/commits/"));
+                        outs.Add(new($"BitBucket ({trimmedUrl.Slice(22)})", $"{url}/commits/"));
                     else if (url.StartsWith("https://codeberg.org/", StringComparison.Ordinal))
-                        outs.Add(new($"Codeberg ({trimmedUrl.Substring(21)})", $"{url}/commit/"));
+                        outs.Add(new($"Codeberg ({trimmedUrl.Slice(21)})", $"{url}/commit/"));
                     else if (url.StartsWith("https://gitea.org/", StringComparison.Ordinal))
-                        outs.Add(new($"Gitea ({trimmedUrl.Substring(18)})", $"{url}/commit/"));
+                        outs.Add(new($"Gitea ({trimmedUrl.Slice(18)})", $"{url}/commit/"));
                     else if (url.StartsWith("https://git.sr.ht/", StringComparison.Ordinal))
-                        outs.Add(new($"sourcehut ({trimmedUrl.Substring(18)})", $"{url}/commit/"));
+                        outs.Add(new($"sourcehut ({trimmedUrl.Slice(18)})", $"{url}/commit/"));
                 }
             }
 

src/Models/RepositorySettings.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
@@ -344,28 +344,28 @@ public string BuildHistoriesFilter()
                     if (filter.Mode == FilterMode.Included)
                         includedRefs.Add(filter.Pattern);
                     else if (filter.Mode == FilterMode.Excluded)
-                        excludedBranches.Add($"--exclude=\"{filter.Pattern.Substring(11)}\" --decorate-refs-exclude=\"{filter.Pattern}\"");
+                        excludedBranches.Add($"--exclude=\"{filter.Pattern.AsSpan().Slice(11)}\" --decorate-refs-exclude=\"{filter.Pattern}\"");
                 }
                 else if (filter.Type == FilterType.LocalBranchFolder)
                 {
                     if (filter.Mode == FilterMode.Included)
-                        includedRefs.Add($"--branches={filter.Pattern.Substring(11)}/*");
+                        includedRefs.Add($"--branches={filter.Pattern.AsSpan().Slice(11)}/*");
                     else if (filter.Mode == FilterMode.Excluded)
-                        excludedBranches.Add($"--exclude=\"{filter.Pattern.Substring(11)}/*\" --decorate-refs-exclude=\"{filter.Pattern}/*\"");
+                        excludedBranches.Add($"--exclude=\"{filter.Pattern.AsSpan().Slice(11)}/*\" --decorate-refs-exclude=\"{filter.Pattern}/*\"");
                 }
                 else if (filter.Type == FilterType.RemoteBranch)
                 {
                     if (filter.Mode == FilterMode.Included)
                         includedRefs.Add(filter.Pattern);
                     else if (filter.Mode == FilterMode.Excluded)
-                        excludedRemotes.Add($"--exclude=\"{filter.Pattern.Substring(13)}\" --decorate-refs-exclude=\"{filter.Pattern}\"");
+                        excludedRemotes.Add($"--exclude=\"{filter.Pattern.AsSpan().Slice(13)}\" --decorate-refs-exclude=\"{filter.Pattern}\"");
                 }
                 else if (filter.Type == FilterType.RemoteBranchFolder)
                 {
                     if (filter.Mode == FilterMode.Included)
-                        includedRefs.Add($"--remotes={filter.Pattern.Substring(13)}/*");
+                        includedRefs.Add($"--remotes={filter.Pattern.AsSpan().Slice(13)}/*");
                     else if (filter.Mode == FilterMode.Excluded)
-                        excludedRemotes.Add($"--exclude=\"{filter.Pattern.Substring(13)}/*\" --decorate-refs-exclude=\"{filter.Pattern}/*\"");
+                        excludedRemotes.Add($"--exclude=\"{filter.Pattern.AsSpan().Slice(13)}/*\" --decorate-refs-exclude=\"{filter.Pattern}/*\"");
                 }
                 else if (filter.Type == FilterType.Tag)
                 {

src/Views/TextDiffView.axaml.cs

@@ -1502,7 +1502,7 @@ protected override void OnDataContextChanged(EventArgs e)
                 {
                     if (line.Content.Length > 10000)
                     {
-                        builder.Append(line.Content.Substring(0, 1000));
+                        builder.Append(line.Content.AsSpan().Slice(0, 1000));
                         builder.Append($"...({line.Content.Length - 1000} characters trimmed)");
                     }
                     else