feat: add a way to spawn populated LineEditor

feat: support pre-filled content in prompts

docs: document new PromptInputLine parameter

fix: remove reset of line contents

config/src/keyassignment.rs

@@ -457,6 +457,9 @@ pub struct QuickSelectArguments {
 #[derive(Debug, Clone, PartialEq, FromDynamic, ToDynamic)]
 pub struct PromptInputLine {
     pub action: Box<KeyAssignment>,
+    /// Optional label to pre-fill the input line with
+    #[dynamic(default)]
+    pub initial_value: Option<String>,
     /// Descriptive text to show ahead of prompt
     #[dynamic(default)]
     pub description: String,

docs/config/lua/keyassignment/PromptInputLine.md

@@ -8,7 +8,7 @@ from the user.
 When the user enters the line, emits an event that allows you to act
 upon the input.
 
-`PromptInputLine` accepts three fields:
+`PromptInputLine` accepts four fields:
 
 * `description` - the text to show at the top of the display area. You may
   embed escape sequences and/or use [wezterm.format](../wezterm/format.md).
@@ -20,6 +20,9 @@ upon the input.
   anything, or CTRL-C to cancel the input.
 * `prompt` - the text to show as the prompt. You may embed escape sequences
   and/or use [wezterm.format](../wezterm/format.md).  Defaults to: `"> "`. {{since('nightly', inline=True)}}
+* `initial_value` - optional.  If provided, the initial content of the input
+  field will be set to this value.  The user may edit it prior to submitting
+  the input.
 
 ## Example of interactively renaming the current tab
 
@@ -34,6 +37,7 @@ config.keys = {
     mods = 'CTRL|SHIFT',
     action = act.PromptInputLine {
       description = 'Enter new name for tab',
+      initial_value = 'My Tab Name',
       action = wezterm.action_callback(function(window, pane, line)
         -- line will be `nil` if they hit escape without entering anything
         -- An empty string if they just hit enter

docs/config/lua/window-events/augment-command-palette.md

@@ -39,6 +39,7 @@ wezterm.on('augment-command-palette', function(window, pane)
 
       action = act.PromptInputLine {
         description = 'Enter new name for tab',
+        initial_value = 'My Tab Name',
         action = wezterm.action_callback(function(window, pane, line)
           if line then
             window:active_tab():set_title(line)

termwiz/src/lineedit/mod.rs

@@ -811,7 +811,6 @@ impl<'term> LineEditor<'term> {
     }
 
     fn read_line_impl(&mut self, host: &mut dyn LineEditorHost) -> Result<Option<String>> {
-        self.line.clear();
         self.history_pos = None;
         self.bottom_line = None;
         self.clear_completion();

wezterm-gui/src/overlay/prompt.rs

@@ -68,6 +68,9 @@ pub fn show_line_prompt_overlay(
     let mut host = PromptHost::new();
     let mut editor = LineEditor::new(&mut term);
     editor.set_prompt(&args.prompt);
+    if let Some(value) = &args.initial_value {
+        editor.set_line_and_cursor(value, value.len());
+    }
     let line = editor.read_line(&mut host)?;
 
     promise::spawn::spawn_into_main_thread(async move {