Separate highlighting from fuzzy search

src/fuzzysearch.rs

@@ -14,8 +14,8 @@ pub fn interactive_fuzzy_search(lines: &Vec<&str>, max_results: usize) -> Select
     enum State {
         Selecting,
         Quit,
-        Selected(usize),
-        Edit(usize),
+        Selected(String),
+        Edit(String),
     }
     let mut state = State::Selecting;
     if let Ok(_raw) = RawScreen::into_raw_mode() {
@@ -29,11 +29,9 @@ pub fn interactive_fuzzy_search(lines: &Vec<&str>, max_results: usize) -> Select
         let mut sync_stdin = input.read_sync();
 
         while state == State::Selecting {
-            let search_result = fuzzy_search(&searchinput, &lines, max_results);
-            let selected_lines: Vec<&str> = search_result
-                .iter()
-                .map(|item| &item.highlighted_text as &str)
-                .collect();
+            let mut search_result = fuzzy_search(&searchinput, &lines, max_results);
+            let selected_lines: Vec<String> =
+                search_result.iter().map(|item| highlight(&item)).collect();
             paint_selection_list(&selected_lines, selected);
             if let Some(ev) = sync_stdin.next() {
                 match ev {
@@ -52,10 +50,10 @@ pub fn interactive_fuzzy_search(lines: &Vec<&str>, max_results: usize) -> Select
                             }
                         }
                         KeyEvent::Char('\n') => {
-                            state = State::Selected(search_result[selected].text_idx);
+                            state = State::Selected(search_result.remove(selected).text);
                         }
                         KeyEvent::Char('\t') | KeyEvent::Right => {
-                            state = State::Edit(search_result[selected].text_idx);
+                            state = State::Edit(search_result.remove(selected).text);
                         }
                         KeyEvent::Char(ch) => {
                             searchinput.push(ch);
@@ -66,7 +64,7 @@ pub fn interactive_fuzzy_search(lines: &Vec<&str>, max_results: usize) -> Select
                             selected = 0;
                         }
                         _ => {
-                            // println!("{}", format!("OTHER InputEvent: {:?}\n\n", k));
+                            // println!("OTHER InputEvent: {:?}", k);
                         }
                     },
                     _ => {}
@@ -84,26 +82,25 @@ pub fn interactive_fuzzy_search(lines: &Vec<&str>, max_results: usize) -> Select
     terminal.clear(ClearType::FromCursorDown).unwrap();
 
     match state {
-        State::Selected(idx) => SelectionResult::Selected(lines[idx].to_string()),
-        State::Edit(idx) => SelectionResult::Edit(lines[idx].to_string()),
+        State::Selected(line) => SelectionResult::Selected(line),
+        State::Edit(line) => SelectionResult::Edit(line),
         _ => SelectionResult::NoSelection,
     }
 }
 
-struct Match {
-    highlighted_text: String,
-    text_idx: usize,
+pub struct Match {
+    text: String,
+    char_matches: Vec<(usize, usize)>,
 }
 
-fn fuzzy_search(searchstr: &str, lines: &Vec<&str>, max_results: usize) -> Vec<Match> {
+pub fn fuzzy_search(searchstr: &str, lines: &Vec<&str>, max_results: usize) -> Vec<Match> {
     if searchstr.is_empty() {
         return lines
             .iter()
             .take(max_results)
-            .enumerate()
-            .map(|(i, line)| Match {
-                highlighted_text: line.to_string(),
-                text_idx: i,
+            .map(|line| Match {
+                text: line.to_string(),
+                char_matches: Vec::new(),
             })
             .collect();
     }
@@ -117,41 +114,43 @@ fn fuzzy_search(searchstr: &str, lines: &Vec<&str>, max_results: usize) -> Vec<M
         .collect::<Vec<_>>();
     matches.sort_by(|a, b| b.1.score().cmp(&a.1.score()));
 
-    let highlight = Colour::Cyan;
     let results: Vec<Match> = matches
         .iter()
         .take(max_results)
-        .map(|(i, m)| {
-            let r = &lines[*i];
-            let mut outstr = String::with_capacity(r.len());
-            let mut idx = 0;
-            for (match_idx, len) in m.continuous_matches() {
-                outstr.push_str(&r[idx..match_idx]);
-                idx = match_idx + len;
-                outstr.push_str(&format!("{}", highlight.paint(&r[match_idx..idx])));
-            }
-            if idx < r.len() {
-                outstr.push_str(&r[idx..r.len()]);
-            }
-            Match {
-                highlighted_text: outstr,
-                text_idx: *i,
-            }
+        .map(|(i, m)| Match {
+            text: lines[*i].to_string(),
+            char_matches: m.continuous_matches(),
         })
         .collect();
     results
 }
 
-fn paint_selection_list(lines: &Vec<&str>, selected: usize) {
+fn highlight(textmatch: &Match) -> String {
+    let hlcol = Colour::Cyan;
+    let text = &textmatch.text;
+    let mut outstr = String::with_capacity(text.len());
+    let mut idx = 0;
+    for (match_idx, len) in &textmatch.char_matches {
+        outstr.push_str(&text[idx..*match_idx]);
+        idx = match_idx + len;
+        outstr.push_str(&format!("{}", hlcol.paint(&text[*match_idx..idx])));
+    }
+    if idx < text.len() {
+        outstr.push_str(&text[idx..text.len()]);
+    }
+    outstr
+}
+
+fn paint_selection_list(lines: &Vec<String>, selected: usize) {
     let dimmed = Colour::White.dimmed();
     let cursor = cursor();
     let (_x, y) = cursor.pos();
     for (i, line) in lines.iter().enumerate() {
         let _ = cursor.goto(0, y + (i as u16));
         if selected == i {
-            println!("{}", *line);
+            println!("{}", line);
         } else {
-            println!("{}", dimmed.paint(*line));
+            println!("{}", dimmed.paint(line));
         }
     }
     let _ = cursor.goto(0, y + (lines.len() as u16));
@@ -164,3 +163,9 @@ fn paint_selection_list(lines: &Vec<&str>, selected: usize) {
     // Clear additional lines from previous selection
     terminal().clear(ClearType::FromCursorDown).unwrap();
 }
+
+#[test]
+fn fuzzy_match() {
+    let matches = fuzzy_search("cb", &vec!["abc", "cargo build"], 1);
+    assert_eq!(matches[0].text, "cargo build");
+}