Remove results from movement function return values, and move editor test utilities to test file

crates/editor/src/test.rs

@@ -1,3 +1,5 @@
+use collections::HashMap;
+
 #[cfg(test)]
 #[ctor::ctor]
 fn init_logger() {
@@ -5,3 +7,27 @@ fn init_logger() {
         env_logger::init();
     }
 }
+
+pub fn marked_text_by(
+    marked_text: &str,
+    markers: Vec<char>,
+) -> (String, HashMap<char, Vec<usize>>) {
+    let mut extracted_markers: HashMap<char, Vec<usize>> = Default::default();
+    let mut unmarked_text = String::new();
+
+    for char in marked_text.chars() {
+        if markers.contains(&char) {
+            let char_offsets = extracted_markers.entry(char).or_insert(Vec::new());
+            char_offsets.push(unmarked_text.len());
+        } else {
+            unmarked_text.push(char);
+        }
+    }
+
+    (unmarked_text, extracted_markers)
+}
+
+pub fn marked_text(marked_text: &str) -> (String, Vec<usize>) {
+    let (unmarked_text, mut markers) = marked_text_by(marked_text, vec!['|']);
+    (unmarked_text, markers.remove(&'|').unwrap_or_else(Vec::new))
+}