Render the help message as the default no-content status message.

src/ansi_escape.rs

@@ -20,8 +20,8 @@ pub(crate) const HIDE_CURSOR: &str = "\x1b[?25l";
 /// DECTCTEM: Make the cursor visible
 pub(crate) const SHOW_CURSOR: &str = "\x1b[?25h";
 
-/// Clear line right of the current position of the cursor
-pub(crate) const CLEAR_LINE_RIGHT_OF_CURSOR: &str = "\x1b[K";
+/// Clear screen from cursor down
+pub(crate) const CLEAR_SCREEN_FROM_CURSOR_DOWN: &str = "\x1b[J";
 
 /// Report the cursor position to the application.
 pub(crate) const DEVICE_STATUS_REPORT: &str = "\x1b[6n";

src/editor.rs

@@ -24,7 +24,7 @@ const REMOVE_LINE: u8 = ctrl_key(b'R');
 const BACKSPACE: u8 = 127;
 
 const HELP_MESSAGE: &str =
-    "^S save | ^Q quit | ^F find | ^G go to | ^D duplicate | ^E execute | ^C copy | ^X cut | ^V paste";
+    "^S save | ^Q quit | ^F find | ^G go to | ^D duplicate | ^R remove | ^E execute | ^C copy | ^X cut | ^V paste";
 
 /// `set_status!` sets a formatted status message for the editor.
 /// Example usage: `set_status!(editor, "{} written to {}", file_size, file_name)`
@@ -173,7 +173,6 @@ impl Editor {
         print!("{USE_ALTERNATE_SCREEN}");
 
         editor.update_window_size()?;
-        set_status!(editor, "{}", HELP_MESSAGE);
 
         Ok(editor)
     }
@@ -290,7 +289,8 @@ impl Editor {
     fn update_window_size(&mut self) -> Result<(), Error> {
         let wsize = sys::get_window_size().or_else(|_| terminal::get_window_size_using_cursor())?;
         // Make room for the status bar and status message
-        (self.screen_rows, self.window_width) = (wsize.0.saturating_sub(2), wsize.1);
+        (self.screen_rows, self.window_width) =
+            (wsize.0.saturating_sub(1 + (self.status_msg().len() + wsize.1 - 1) / wsize.1), wsize.1);
         self.update_screen_cols();
         Ok(())
     }
@@ -533,7 +533,7 @@ impl Editor {
     fn draw_rows(&self, buffer: &mut String) -> Result<(), Error> {
         let row_it = self.rows.iter().map(Some).chain(repeat(None)).enumerate();
         for (i, row) in row_it.skip(self.cursor.roff).take(self.screen_rows) {
-            buffer.push_str(CLEAR_LINE_RIGHT_OF_CURSOR);
+            buffer.push_str(CLEAR_SCREEN_FROM_CURSOR_DOWN);
             if let Some(row) = row {
                 // Draw a row of text
                 self.draw_left_padding(buffer, i + 1)?;
@@ -570,13 +570,16 @@ impl Editor {
         Ok(())
     }
 
+    /// Returns the message for the message bar, or the help message if none is applicable.
+    fn status_msg(&self) -> &str {
+        let msg = self.status_msg.as_ref().filter(|sm| sm.time.elapsed() < self.config.message_dur);
+        msg.map_or(HELP_MESSAGE, |sm| sm.msg.as_str())
+    }
+
     /// Draw the message bar on the terminal, by adding characters to the buffer.
     fn draw_message_bar(&self, buffer: &mut String) {
-        buffer.push_str(CLEAR_LINE_RIGHT_OF_CURSOR);
-        let msg_duration = self.config.message_dur;
-        if let Some(sm) = self.status_msg.as_ref().filter(|sm| sm.time.elapsed() < msg_duration) {
-            buffer.push_str(&sm.msg[..sm.msg.len().min(self.window_width)]);
-        }
+        buffer.push_str(CLEAR_SCREEN_FROM_CURSOR_DOWN);
+        buffer.push_str(self.status_msg());
     }
 
     /// Refresh the screen: update the offsets, draw the rows, the status bar, the message bar, and