AK: Add LexicalPath::relative_path

luteresa · Feb 20, 2021 · 7ecb21a · 7ecb21a
1 parent 50f887c
commit 7ecb21a
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diff --git a/AK/LexicalPath.cpp b/AK/LexicalPath.cpp
@@ -119,4 +119,19 @@ String LexicalPath::canonicalized_path(const StringView& path)
  return LexicalPath(path).string();
 }
 
+String LexicalPath::relative_path(const String absolute_path, const String& prefix)
+{
+ if (!LexicalPath { absolute_path }.is_absolute() || !LexicalPath { prefix }.is_absolute())
+ return {};
+
+ if (!absolute_path.starts_with(prefix))
+ return absolute_path;
+
+ size_t prefix_length = LexicalPath { prefix }.string().length() + 1;
+ if (prefix_length >= absolute_path.length())
+ return {};
+
+ return absolute_path.substring(prefix_length);
+}
+
 }
diff --git a/AK/LexicalPath.h b/AK/LexicalPath.h
@@ -50,6 +50,7 @@ class LexicalPath {
  bool has_extension(const StringView&) const;
 
  static String canonicalized_path(const StringView&);
+ static String relative_path(const String absolute_path, const String& prefix);
 
 private:
  void canonicalize();