Edit editor contents externally

src/ui/util.rs

@@ -3,11 +3,15 @@ use std::sync::Arc;
 use parking_lot::FairMutex;
 use toss::terminal::Terminal;
 
-pub fn prompt(terminal: &mut Terminal, crossterm_lock: &Arc<FairMutex<()>>) -> Option<String> {
+pub fn prompt(
+    terminal: &mut Terminal,
+    crossterm_lock: &Arc<FairMutex<()>>,
+    initial_text: &str,
+) -> Option<String> {
     let content = {
         let _guard = crossterm_lock.lock();
         terminal.suspend().expect("could not suspend");
-        let content = edit::edit("");
+        let content = edit::edit(initial_text);
         terminal.unsuspend().expect("could not unsuspend");
         content
     };

src/ui/widgets/editor.rs

@@ -2,11 +2,14 @@ use std::iter;
 use std::sync::Arc;
 
 use async_trait::async_trait;
-use parking_lot::Mutex;
+use parking_lot::{FairMutex, Mutex};
 use toss::frame::{Frame, Pos, Size};
 use toss::styled::Styled;
+use toss::terminal::Terminal;
 use unicode_segmentation::UnicodeSegmentation;
 
+use crate::ui::util;
+
 use super::Widget;
 
 ///////////
@@ -66,6 +69,12 @@ impl InnerEditorState {
         panic!("cursor index out of bounds");
     }
 
+    fn set_text(&mut self, text: String) {
+        self.text = text;
+        self.idx = self.idx.min(self.text.len());
+        self.move_cursor_to_grapheme_boundary();
+    }
+
     /// Insert a character at the current cursor position and move the cursor
     /// accordingly.
     fn insert_char(&mut self, ch: char) {
@@ -201,6 +210,10 @@ impl EditorState {
         self.0.lock().text.clone()
     }
 
+    pub fn set_text(&self, text: String) {
+        self.0.lock().set_text(text);
+    }
+
     pub fn insert_char(&self, ch: char) {
         self.0.lock().insert_char(ch);
     }
@@ -222,6 +235,13 @@ impl EditorState {
     pub fn move_cursor_right(&self) {
         self.0.lock().move_cursor_right();
     }
+
+    pub fn edit_externally(&self, terminal: &mut Terminal, crossterm_lock: &Arc<FairMutex<()>>) {
+        let mut guard = self.0.lock();
+        if let Some(text) = util::prompt(terminal, crossterm_lock, &guard.text) {
+            guard.set_text(text);
+        }
+    }
 }
 
 ////////////