...

src/text/dedent.rs

@@ -81,3 +81,52 @@ pub fn dedent(text: &str) -> String {
         .collect::<Vec<String>>()
         .join("\n")
 }
+
+
+/**
+ * Prefix a multiline string with a specified prefix.
+ * 
+ * This function adds the specified prefix to the beginning of each line in the input text.
+ * 
+ * # Arguments
+ * 
+ * * `text` - The multiline string to prefix
+ * * `prefix` - The prefix to add to each line
+ * 
+ * # Returns
+ * 
+ * * `String` - The prefixed string
+ * 
+ * # Examples
+ * 
+ * ```
+ * let text = "line 1\nline 2\nline 3";
+ * let prefixed = prefix(text, "    ");
+ * assert_eq!(prefixed, "    line 1\n    line 2\n    line 3");
+ * ```
+ */
+pub fn prefix(text: &str, prefix: &str) -> String {
+    text.lines()
+        .map(|line| format!("{}{}", prefix, line))
+        .collect::<Vec<String>>()
+        .join("\n")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_dedent() {
+        let indented = "    line 1\n    line 2\n        line 3";
+        let dedented = dedent(indented);
+        assert_eq!(dedented, "line 1\nline 2\n    line 3");
+    }
+
+    #[test]
+    fn test_prefix() {
+        let text = "line 1\nline 2\nline 3";
+        let prefixed = prefix(text, "    ");
+        assert_eq!(prefixed, "    line 1\n    line 2\n    line 3");
+    }
+}