Implement multi-select for open mode

This introduces the ability to select multiple entries in open mode. Entries can
be toggled on/off using the space key when navigating using the normal sub-mode.

src/commands/open.rs

@@ -9,3 +9,12 @@ pub fn pin_query(app: &mut Application) -> Result {
 
     Ok(())
 }
+
+pub fn toggle_selection(app: &mut Application) -> Result {
+    match app.mode {
+        Mode::Open(ref mut mode) => mode.toggle_selection(),
+        _ => bail!("Can't mark selections outside of open mode."),
+    }
+
+    Ok(())
+}

src/commands/search_select.rs

@@ -14,29 +14,27 @@ pub fn accept(app: &mut Application) -> Result {
             (selection.command)(app)?;
         }
         Mode::Open(ref mut mode) => {
-            let DisplayablePath(path) = mode
-                .selection()
-                .ok_or("Couldn't find a selected path to open")?;
-
-            let syntax_definition = app
-                .preferences
-                .borrow()
-                .syntax_definition_name(path)
-                .and_then(|name| app.workspace.syntax_set.find_syntax_by_name(&name).cloned());
-
-            app.workspace
-                .open_buffer(path)
-                .chain_err(|| "Couldn't open a buffer for the specified path.")?;
-
-            let buffer = app.workspace.current_buffer.as_mut().unwrap();
-
-            // Only override the default syntax definition if the user provided
-            // a valid one in their preferences.
-            if syntax_definition.is_some() {
-                buffer.syntax_definition = syntax_definition;
+            for DisplayablePath(path) in mode.selections() {
+                let syntax_definition = app
+                    .preferences
+                    .borrow()
+                    .syntax_definition_name(path)
+                    .and_then(|name| app.workspace.syntax_set.find_syntax_by_name(&name).cloned());
+
+                app.workspace
+                    .open_buffer(path)
+                    .chain_err(|| "Couldn't open a buffer for the specified path.")?;
+
+                let buffer = app.workspace.current_buffer.as_mut().unwrap();
+
+                // Only override the default syntax definition if the user provided
+                // a valid one in their preferences.
+                if syntax_definition.is_some() {
+                    buffer.syntax_definition = syntax_definition;
+                }
+
+                app.view.initialize_buffer(buffer)?;
             }
-
-            app.view.initialize_buffer(buffer)?;
         }
         Mode::Theme(ref mut mode) => {
             let theme_key = mode.selection().ok_or("No theme selected")?;

src/input/key_map/default.yml

@@ -162,7 +162,7 @@ path:
 
 search_select:
   enter: search_select::accept
-  space: search_select::accept
+  space: open::toggle_selection
   backspace: search_select::pop_search_token
   escape: application::switch_to_normal_mode
   up: search_select::select_previous

src/models/application/modes/open/displayable_path.rs

@@ -3,6 +3,7 @@ use std::path::PathBuf;
 
 // Newtype to make a standard path buffer presentable (via the Display
 // trait), which is required for any type used in search/select mode.
+#[derive(Clone, Eq, Hash, PartialEq)]
 pub struct DisplayablePath(pub PathBuf);
 
 impl fmt::Display for DisplayablePath {

src/models/application/modes/open/mod.rs

@@ -7,6 +7,7 @@ use crate::models::application::Event;
 use crate::util::SelectableVec;
 use bloodhound::ExclusionPattern;
 pub use bloodhound::Index;
+use std::collections::HashSet;
 use std::fmt;
 use std::path::PathBuf;
 use std::slice::Iter;
@@ -25,6 +26,7 @@ pub struct OpenMode {
     pinned_input: String,
     index: OpenModeIndex,
     pub results: SelectableVec<DisplayablePath>,
+    marked_results: HashSet<usize>,
     config: SearchSelectConfig,
 }
 
@@ -36,6 +38,7 @@ impl OpenMode {
             pinned_input: String::new(),
             index: OpenModeIndex::Indexing(path),
             results: SelectableVec::new(Vec::new()),
+            marked_results: HashSet::new(),
             config,
         }
     }
@@ -56,6 +59,7 @@ impl OpenMode {
         self.config = config;
         self.index = OpenModeIndex::Indexing(path.clone());
         self.results = SelectableVec::new(Vec::new());
+        self.marked_results = HashSet::new();
 
         // Build and populate the index in a separate thread.
         thread::spawn(move || {
@@ -107,6 +111,30 @@ impl OpenMode {
             PopSearchToken::pop_search_token(self);
         }
     }
+
+    pub fn toggle_selection(&mut self) {
+        if let None = self.marked_results.take(&self.selected_index()) {
+            self.marked_results.insert(self.selected_index());
+        }
+    }
+
+    pub fn selections(&self) -> Vec<&DisplayablePath> {
+        let mut selections: Vec<&DisplayablePath> = self
+            .marked_results
+            .iter()
+            .map(|i| self.results.get(*i).unwrap())
+            .collect();
+        selections.push(self.selection().unwrap());
+
+        selections
+    }
+
+    pub fn selected_indices(&self) -> Vec<usize> {
+        let mut selected_indices: Vec<usize> = self.marked_results.iter().copied().collect();
+        selected_indices.push(self.selected_index());
+
+        selected_indices
+    }
 }
 
 impl fmt::Display for OpenMode {
@@ -137,6 +165,7 @@ impl SearchSelectMode for OpenMode {
         };
 
         self.results = SelectableVec::new(results);
+        self.marked_results = HashSet::new();
     }
 
     fn query(&mut self) -> &mut String {
@@ -306,4 +335,194 @@ mod tests {
         mode.pop_search_token();
         assert_eq!(mode.pinned_query(), "");
     }
+
+    #[test]
+    fn selections_returns_current_selection() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        mode.query().push_str("Cargo.toml");
+        mode.search();
+
+        let selections: Vec<String> = mode.selections().iter().map(|r| r.to_string()).collect();
+        assert_eq!(selections, vec!["Cargo.toml"]);
+    }
+
+    #[test]
+    fn selections_includes_marked_selections() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        mode.query().push_str("Cargo");
+        mode.search();
+        mode.toggle_selection();
+        mode.select_next();
+
+        let mut selections: Vec<String> = mode.selections().iter().map(|r| r.to_string()).collect();
+        selections.sort();
+        assert_eq!(selections, vec!["Cargo.lock", "Cargo.toml"]);
+    }
+
+    #[test]
+    fn selections_does_not_include_unmarked_indices() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        mode.query().push_str("Cargo");
+        mode.search();
+        mode.toggle_selection();
+        mode.toggle_selection();
+        mode.select_next();
+
+        let selections: Vec<String> = mode.selections().iter().map(|r| r.to_string()).collect();
+        assert_eq!(selections, vec!["Cargo.lock"]);
+    }
+
+    #[test]
+    fn selected_indices_returns_current_index() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        mode.query().push_str("Cargo.toml");
+        mode.search();
+
+        assert_eq!(mode.selected_indices(), vec![0]);
+    }
+
+    #[test]
+    fn selected_indices_includes_marked_indices() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        mode.query().push_str("Cargo");
+        mode.search();
+        mode.toggle_selection();
+        mode.select_next();
+
+        assert_eq!(mode.selected_indices(), vec![0, 1]);
+    }
+
+    #[test]
+    fn selected_indices_does_not_include_unmarked_indices() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        mode.query().push_str("Cargo");
+        mode.search();
+        mode.toggle_selection();
+        mode.toggle_selection();
+        mode.select_next();
+
+        assert_eq!(mode.selected_indices(), vec![1]);
+    }
+
+    #[test]
+    fn search_clears_marked_indices() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path.clone(), None, sender.clone(), config.clone());
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        // Produce results and mark one of them
+        mode.query().push_str("Cargo");
+        mode.search();
+        mode.toggle_selection();
+
+        // Change the search results
+        mode.query().push_str(".");
+        mode.search();
+
+        // Ensure the previously-marked result isn't currently selected
+        mode.select_next();
+
+        // Verify that the marked result isn't included
+        assert_eq!(mode.selected_indices(), vec![1]);
+    }
+
+    #[test]
+    fn reset_clears_marked_indices() {
+        let path = env::current_dir().expect("can't get current directory/path");
+        let config = SearchSelectConfig::default();
+        let mut mode = OpenMode::new(path.clone(), config.clone());
+        let (sender, receiver) = channel();
+
+        // Populate the index
+        mode.reset(path.clone(), None, sender.clone(), config.clone());
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+
+        // Produce results and mark one of them
+        mode.query().push_str("Cargo");
+        mode.search();
+        mode.toggle_selection();
+
+        // Reset the mode and repopulate the index
+        mode.reset(path, None, sender, config);
+        if let Ok(Event::OpenModeIndexComplete(index)) = receiver.recv() {
+            mode.set_index(index);
+        }
+        mode.query().push_str("Cargo");
+        mode.search();
+
+        // Ensure the previously-marked result isn't currently selected
+        mode.select_next();
+
+        // Verify that the marked result isn't included
+        assert_eq!(mode.selected_indices(), vec![1]);
+    }
 }

src/presenters/modes/open.rs

@@ -41,9 +41,13 @@ pub fn display(workspace: &mut Workspace, mode: &mut OpenMode, view: &mut View)
         );
     } else {
         // Draw the list of search results.
+        let selected_indices = mode.selected_indices();
+
         for (line, result) in mode.results().enumerate() {
             let (content, colors, style) = if line == mode.selected_index() {
                 (format!("> {}", result), Colors::Focused, Style::Bold)
+            } else if selected_indices.contains(&line) {
+                (format!("  {}", result), Colors::Focused, Style::Bold)
             } else {
                 (format!("  {}", result), Colors::Default, Style::Default)
             };