Trim leading whitespace

MihuBot · Sep 1, 2024 · c181baa · c181baa
1 parent c0ca13e
commit c181baa
Showing 1 changed file with 58 additions and 0 deletions.
diff --git a/Runner/RegexDiffJob.cs b/Runner/RegexDiffJob.cs
@@ -201,6 +201,8 @@ await RunProcessAsync("git", $"diff --histogram {mainFile} {prFile}", shortDiffL
                 fullDiffLines.RemoveAll(ShouldSkipLine);
                 shortDiffLines.RemoveAll(ShouldSkipLine);
 
+                TrimExcessLeadingWhiteSpace(shortDiffLines);
+
                 entry.FullDiff = string.Join('\n', fullDiffLines);
                 entry.ShortDiff = string.Join('\n', shortDiffLines);
             }
@@ -222,6 +224,62 @@ static bool ShouldSkipLine(string line)
                 line.StartsWith("@@", StringComparison.Ordinal) ||
                 line.StartsWith("\\ No newline at end of file", StringComparison.Ordinal);
         }
+
+        static void TrimExcessLeadingWhiteSpace(List<string> lines)
+        {
+            if (lines.Count == 0)
+                return;
+
+            if (lines[0].AsSpan().TrimEnd().Length == 0)
+            {
+                lines.RemoveAt(0);
+            }
+
+            if (lines.Count == 0)
+                return;
+
+            if (lines[^1].AsSpan().TrimEnd().Length == 0)
+            {
+                lines.RemoveAt(lines.Count - 1);
+            }
+
+            if (lines.Count == 0)
+                return;
+
+            int minOffset = lines.Where(l => l.Length > 0).Min(CountWhiteSpace);
+
+            if (minOffset <= 3)
+                return;
+
+            minOffset -= 2;
+
+            for (int i = 0; i < lines.Count; i++)
+            {
+                string line = lines[i];
+                if (line.Length > 0)
+                {
+                    lines[i] = line[0] is '+' or '-'
+                        ? $"{line[0]}{line.AsSpan(minOffset - 1)}"
+                        : line.Substring(minOffset);
+                }
+            }
+
+            static int CountWhiteSpace(string line)
+            {
+                int i = 0;
+                if (line.StartsWith('+') || line.StartsWith('-'))
+                {
+                    i++;
+                }
+
+                while (i < line.Length && char.IsWhiteSpace(line[i]))
+                {
+                    i++;
+                }
+
+                return i;
+            }
+        }
     }
 
     private async Task ExtractSearchValuesInfoAsync(RegexEntry[] entries)