Add --strip-ansi option

src/preprocessor.rs

@@ -136,6 +136,26 @@ pub fn replace_nonprintable(
     output
 }
 
+/// Strips ANSI escape sequences from the input.
+pub fn strip_ansi(line: &str) -> String {
+    let mut buffer = String::with_capacity(line.len());
+
+    for seq in EscapeSequenceOffsetsIterator::new(line) {
+        if let EscapeSequenceOffsets::Text { .. } = seq {
+            buffer.push_str(&line[seq.index_of_start()..seq.index_past_end()]);
+        }
+    }
+
+    buffer
+}
+
+#[derive(Debug, PartialEq, Clone, Copy, Default)]
+pub enum StripAnsiMode {
+    #[default]
+    Never,
+    Always,
+}
+
 #[test]
 fn test_try_parse_utf8_char() {
     assert_eq!(try_parse_utf8_char(&[0x20]), Some((' ', 1)));
@@ -179,3 +199,14 @@ fn test_try_parse_utf8_char() {
     assert_eq!(try_parse_utf8_char(&[0xef, 0x20]), None);
     assert_eq!(try_parse_utf8_char(&[0xf0, 0xf0]), None);
 }
+
+#[test]
+fn test_strip_ansi() {
+    // The sequence detection is covered by the tests in the vscreen module.
+    assert_eq!(strip_ansi("no ansi"), "no ansi");
+    assert_eq!(strip_ansi("\x1B[33mone"), "one");
+    assert_eq!(
+        strip_ansi("\x1B]1\x07multiple\x1B[J sequences"),
+        "multiple sequences"
+    );
+}