Merge pull request #259 from damymetzke/fuzzy-select-vim

Add vim mode to `FuzzySelect`

src/prompts/fuzzy_select.rs

@@ -38,6 +38,7 @@ pub struct FuzzySelect<'a> {
     report: bool,
     clear: bool,
     highlight_matches: bool,
+    enable_vim_mode: bool,
     max_length: Option<usize>,
     theme: &'a dyn Theme,
     /// Search string that a fuzzy search with start with.
@@ -118,6 +119,17 @@ impl FuzzySelect<'_> {
         self
     }
 
+    /// Indicated whether to allow the use of vim mode
+    ///
+    /// Vim mode can be entered by pressing Escape.
+    /// This then allows the user to navigate using hjkl.
+    ///
+    /// The default is to disable vim mode.
+    pub fn vim_mode(mut self, val: bool) -> Self {
+        self.enable_vim_mode = val;
+        self
+    }
+
     /// Sets the maximum number of visible options.
     ///
     /// The default is the height of the terminal minus 2.
@@ -209,6 +221,8 @@ impl FuzzySelect<'_> {
 
         term.hide_cursor()?;
 
+        let mut vim_mode = false;
+
         loop {
             render.clear()?;
             render.fuzzy_select_prompt(self.prompt.as_str(), &search_term, position)?;
@@ -240,16 +254,24 @@ impl FuzzySelect<'_> {
             }
             term.flush()?;
 
-            match (term.read_key()?, sel) {
-                (Key::Escape, _) if allow_quit => {
+            match (term.read_key()?, sel, vim_mode) {
+                (Key::Escape, _, false) if self.enable_vim_mode => {
+                    vim_mode = true;
+                }
+                (Key::Escape, _, false) | (Key::Char('q'), _, true) if allow_quit => {
                     if self.clear {
                         render.clear()?;
                         term.flush()?;
                     }
                     term.show_cursor()?;
                     return Ok(None);
                 }
-                (Key::ArrowUp | Key::BackTab, _) if !filtered_list.is_empty() => {
+                (Key::Char('i' | 'a'), _, true) => {
+                    vim_mode = false;
+                }
+                (Key::ArrowUp | Key::BackTab, _, _) | (Key::Char('k'), _, true)
+                    if !filtered_list.is_empty() =>
+                {
                     if sel == Some(0) {
                         starting_row =
                             filtered_list.len().max(visible_term_rows) - visible_term_rows;
@@ -266,7 +288,9 @@ impl FuzzySelect<'_> {
                     };
                     term.flush()?;
                 }
-                (Key::ArrowDown | Key::Tab, _) if !filtered_list.is_empty() => {
+                (Key::ArrowDown | Key::Tab, _, _) | (Key::Char('j'), _, true)
+                    if !filtered_list.is_empty() =>
+                {
                     sel = match sel {
                         None => Some(0),
                         Some(sel) => {
@@ -280,15 +304,17 @@ impl FuzzySelect<'_> {
                     }
                     term.flush()?;
                 }
-                (Key::ArrowLeft, _) if position > 0 => {
+                (Key::ArrowLeft, _, _) | (Key::Char('h'), _, true) if position > 0 => {
                     position -= 1;
                     term.flush()?;
                 }
-                (Key::ArrowRight, _) if position < search_term.len() => {
+                (Key::ArrowRight, _, _) | (Key::Char('l'), _, true)
+                    if position < search_term.len() =>
+                {
                     position += 1;
                     term.flush()?;
                 }
-                (Key::Enter, Some(sel)) if !filtered_list.is_empty() => {
+                (Key::Enter, Some(sel), _) if !filtered_list.is_empty() => {
                     if self.clear {
                         render.clear()?;
                     }
@@ -305,12 +331,12 @@ impl FuzzySelect<'_> {
                     term.show_cursor()?;
                     return Ok(sel_string_pos_in_items);
                 }
-                (Key::Backspace, _) if position > 0 => {
+                (Key::Backspace, _, _) if position > 0 => {
                     position -= 1;
                     search_term.remove(position);
                     term.flush()?;
                 }
-                (Key::Char(chr), _) if !chr.is_ascii_control() => {
+                (Key::Char(chr), _, _) if !chr.is_ascii_control() => {
                     search_term.insert(position, chr);
                     position += 1;
                     term.flush()?;
@@ -349,6 +375,7 @@ impl<'a> FuzzySelect<'a> {
             report: true,
             clear: true,
             highlight_matches: true,
+            enable_vim_mode: false,
             max_length: None,
             theme,
             initial_text: "".into(),