Command Sequences, Blocking CLI Commands, New Plugin APIs (#4546)

* fix deadlocks

* initial logging to plugin implementation

* only log actions, include keys as Action::Write

* send actions to plugins as a new Event::UserAction

* add Action::Write metadata to plugin API

* run_action plugin command and permission

* block-until-exit/success/failure in the cli

* fix tests

* add NewBlockingPane to the plugin API

* run actions in a different thread so as not to block plugin execution

* add custom context to run_action flow

* fixes for floating pane z_index sorting and unknown protobuf events not crashing plugins

* always render the frame of pinned panes

* macros module

* add macros to config

* KDL macro parsing

* thread macros to the plugin thread

* get/update/delete macros from plugins

* add macros updated event

* add ability to rename macros

* fix deadlock

* fix z_indices with pinned unselectable panes bug

* allow plugins to opt-in to show_cursor

* change show_cursor(bool) to show_cursor(Option<coordinates>)

* test

* upgrade strum to allow proper enum iteration and case insensitive fromstr implementation for Actions

* better cwd tracking for exited command panes

* add initial panes to NewTab Action (no-op for now)

* add initial panes to cli newtab action

* make initial panes work

* add close_on_exit and start_suspended to the cli

* properly convert newtab action (potentially breaking for plugins)

* allow first pane in tab to block

* make distinction between opening panes with the last active client and the current pane in the cli

* improve some apis

* fix fixed size closing pane bug

* fix plugin cursor coordinates

* fix issues with launch-or-focus-plugin having to do with in-place and suppressed panes

* fix: set affected pane in replace pane

* allow setting a pane in place when it is suppressed and being focused (tests failing)

* fix tests

* some fixes for unsuppression of panes

* some fixes for completion_tx in new tab action

* allow replace/suppressed rather than replace/close only

* fixes for inserting suppressed panes without conflicts

* pane focus history and explicit unsuppress plugin api

* fix: prefer explicitly provided pane id in placement in actions that provide it

* fix floating pane coordinate change and z_index

* fix plugin cache dir to persist between sessions

* fix some stack focusing issues when adding panes without a client id

* make sure pinned panes are always above non-pinned floating panes

* allow plugins to copy to clipboard

* initial text styling additions implementations - buggy

* fix dimming issues

* remove extras, stay with just dim and unbold

* unbold and dim as indices

* allow ui components to render success/error colors

* allow plugins to send sigint/sigkill to processes, as well as receive their pid

* ui component fixes and send originating plugin context with run_action

* originating plugin for new tab too

* make plugn show pane command also expand stacked panes

* add sequence plugin

* remove macros

* remove snapshots

* add shortcut for sequence plugin

* fix plugin tests

* plugin tests for new apis

* update snapshots for sequence shortcut

* cleanups and formatting

* Event::CwdChanged

* moar cleanups

* remove some warnings

* remove mroe warnings

* remove dead code

* remove more dead code

* fix minor bugs in sequence plugin

* update sequence help and format codebase

* fix conditional blocking cli commands

* fix initial-command new-tab cli flag

* add client_ids to CwdChanged Event

* last fixes

* add pr

1 files changed, 997 insertions, 0 deletions

diff --git a/default-plugins/sequence/src/ui/text_input.rs b/default-plugins/sequence/src/ui/text_input.rs
new file mode 100644
index 00000000..2694e17a
--- /dev/null
+++ b/default-plugins/sequence/src/ui/text_input.rs
@@ -0,0 +1,997 @@
+use zellij_tile::prelude::*;
+
+const MAX_UNDO_STACK_SIZE: usize = 100;
+
+/// Action returned by TextInput after handling a key event
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(test, derive(Eq))]
+pub enum InputAction {
+    /// Continue editing
+    Continue,
+    /// User pressed Enter to submit
+    Submit,
+    /// User pressed Esc to cancel
+    Cancel,
+    /// User pressed Tab to request completion
+    Complete,
+    /// Key was not handled by the input
+    NoAction,
+}
+
+/// A reusable text input component with cursor support and standard editing keybindings
+#[derive(Debug, Clone)]
+pub struct TextInput {
+    buffer: String,
+    cursor_position: usize, // Character position (0-based), NOT byte position
+    undo_stack: Vec<(String, usize)>, // (buffer, cursor) snapshots
+    redo_stack: Vec<(String, usize)>,
+    last_edit_was_insert: bool, // For coalescing consecutive inserts
+}
+
+impl TextInput {
+    /// Create a new TextInput with the given initial text
+    /// Cursor is positioned at the end of the text
+    pub fn new(initial_text: String) -> Self {
+        let cursor_position = initial_text.chars().count();
+        Self {
+            buffer: initial_text,
+            cursor_position,
+            undo_stack: Vec::new(),
+            redo_stack: Vec::new(),
+            last_edit_was_insert: false,
+        }
+    }
+
+    /// Create an empty TextInput
+    pub fn empty() -> Self {
+        Self::new(String::new())
+    }
+
+    /// Get the current text
+    pub fn get_text(&self) -> &str {
+        &self.buffer
+    }
+
+    /// Get the cursor position (in characters, not bytes)
+    pub fn get_cursor_position(&self) -> usize {
+        self.cursor_position
+    }
+
+    /// Check if the input is empty
+    pub fn is_empty(&self) -> bool {
+        self.buffer.is_empty()
+    }
+
+    /// Get a shorthand for cursor_position
+    pub fn cursor_position(&self) -> usize {
+        self.cursor_position
+    }
+
+    /// Get mutable access to the underlying buffer for direct manipulation
+    pub fn get_text_mut(&mut self) -> &mut String {
+        &mut self.buffer
+    }
+
+    /// Set the text and move cursor to the end
+    pub fn set_text(&mut self, text: String) {
+        self.break_coalescing();
+        self.save_undo_state();
+        self.cursor_position = text.chars().count();
+        self.buffer = text;
+    }
+
+    /// Set cursor position (clamped to text length)
+    pub fn set_cursor_position(&mut self, pos: usize) {
+        let text_len = self.buffer.chars().count();
+        self.cursor_position = pos.min(text_len);
+    }
+
+    /// Clear all text and reset cursor
+    pub fn clear(&mut self) {
+        self.break_coalescing();
+        self.save_undo_state();
+        self.buffer.clear();
+        self.cursor_position = 0;
+    }
+
+    /// Insert a character at the current cursor position
+    pub fn insert_char(&mut self, c: char) {
+        self.save_undo_state_unless_coalescing();
+        // Convert cursor position (char index) to byte index
+        let byte_index = self.char_index_to_byte_index(self.cursor_position);
+        self.buffer.insert(byte_index, c);
+        self.cursor_position += 1;
+    }
+
+    /// Delete the character before the cursor (backspace)
+    pub fn backspace(&mut self) {
+        if self.cursor_position > 0 {
+            self.break_coalescing();
+            self.save_undo_state();
+            self.cursor_position -= 1;
+            let byte_index = self.char_index_to_byte_index(self.cursor_position);
+            self.buffer.remove(byte_index);
+        }
+    }
+
+    /// Delete the character at the cursor position (delete key)
+    pub fn delete(&mut self) {
+        let len = self.buffer.chars().count();
+        if self.cursor_position < len {
+            self.break_coalescing();
+            self.save_undo_state();
+            let byte_index = self.char_index_to_byte_index(self.cursor_position);
+            self.buffer.remove(byte_index);
+        }
+    }
+
+    /// Delete the word before the cursor (Ctrl/Alt + Backspace)
+    pub fn delete_word_backward(&mut self) {
+        if self.cursor_position == 0 {
+            return;
+        }
+
+        self.break_coalescing();
+        self.save_undo_state();
+
+        let old_position = self.cursor_position;
+        self.move_word_left();
+        let new_position = self.cursor_position;
+
+        // Delete from new position to old position
+        let start_byte = self.char_index_to_byte_index(new_position);
+        let end_byte = self.char_index_to_byte_index(old_position);
+        self.buffer.drain(start_byte..end_byte);
+    }
+
+    /// Delete the word after the cursor (Ctrl/Alt + Delete)
+    pub fn delete_word_forward(&mut self) {
+        let chars: Vec<char> = self.buffer.chars().collect();
+        let len = chars.len();
+
+        if self.cursor_position >= len {
+            return;
+        }
+
+        self.break_coalescing();
+        self.save_undo_state();
+
+        let start_position = self.cursor_position;
+        let mut end_position = start_position;
+
+        // Skip the current word
+        while end_position < len && !chars[end_position].is_whitespace() {
+            end_position += 1;
+        }
+
+        // Skip any whitespace after the word
+        while end_position < len && chars[end_position].is_whitespace() {
+            end_position += 1;
+        }
+
+        // Delete from start to end position
+        let start_byte = self.char_index_to_byte_index(start_position);
+        let end_byte = self.char_index_to_byte_index(end_position);
+        self.buffer.drain(start_byte..end_byte);
+    }
+
+    /// Move cursor one position to the left
+    pub fn move_left(&mut self) {
+        if self.cursor_position > 0 {
+            self.break_coalescing();
+            self.cursor_position -= 1;
+        }
+    }
+
+    /// Move cursor one position to the right
+    pub fn move_right(&mut self) {
+        let len = self.buffer.chars().count();
+        if self.cursor_position < len {
+            self.break_coalescing();
+            self.cursor_position += 1;
+        }
+    }
+
+    /// Move cursor to the start of the text (Ctrl-A / Home)
+    pub fn move_to_start(&mut self) {
+        self.break_coalescing();
+        self.cursor_position = 0;
+    }
+
+    /// Move cursor to the end of the text (Ctrl-E / End)
+    pub fn move_to_end(&mut self) {
+        self.break_coalescing();
+        self.cursor_position = self.buffer.chars().count();
+    }
+
+    /// Move cursor to the start of the previous word (Ctrl/Alt + Left)
+    pub fn move_word_left(&mut self) {
+        if self.cursor_position == 0 {
+            return;
+        }
+
+        self.break_coalescing();
+
+        let chars: Vec<char> = self.buffer.chars().collect();
+        let mut pos = self.cursor_position;
+
+        // Skip any whitespace immediately to the left
+        while pos > 0 && chars[pos - 1].is_whitespace() {
+            pos -= 1;
+        }
+
+        // Skip the word characters
+        while pos > 0 && !chars[pos - 1].is_whitespace() {
+            pos -= 1;
+        }
+
+        self.cursor_position = pos;
+    }
+
+    /// Move cursor to the start of the next word (Ctrl/Alt + Right)
+    pub fn move_word_right(&mut self) {
+        let chars: Vec<char> = self.buffer.chars().collect();
+        let len = chars.len();
+
+        if self.cursor_position >= len {
+            return;
+        }
+
+        self.break_coalescing();
+
+        let mut pos = self.cursor_position;
+
+        // Skip the current word
+        while pos < len && !chars[pos].is_whitespace() {
+            pos += 1;
+        }
+
+        // Skip any whitespace
+        while pos < len && chars[pos].is_whitespace() {
+            pos += 1;
+        }
+
+        self.cursor_position = pos;
+    }
+
+    /// Handle a key event and return the appropriate action
+    /// This is the main entry point for key handling
+    pub fn handle_key(&mut self, key: KeyWithModifier) -> InputAction {
+        // Check for Ctrl modifiers
+        if key.has_modifiers(&[KeyModifier::Ctrl]) {
+            match key.bare_key {
+                BareKey::Char('a') => {
+                    self.move_to_start();
+                    return InputAction::Continue;
+                },
+                BareKey::Char('e') => {
+                    self.move_to_end();
+                    return InputAction::Continue;
+                },
+                BareKey::Char('c') => {
+                    // Ctrl-C clears the prompt
+                    return InputAction::Cancel;
+                },
+                BareKey::Char('z') => {
+                    // Ctrl-Z: Undo
+                    self.undo();
+                    return InputAction::Continue;
+                },
+                BareKey::Char('y') => {
+                    // Ctrl-Y: Redo
+                    self.redo();
+                    return InputAction::Continue;
+                },
+                BareKey::Left => {
+                    self.move_word_left();
+                    return InputAction::Continue;
+                },
+                BareKey::Right => {
+                    self.move_word_right();
+                    return InputAction::Continue;
+                },
+                BareKey::Backspace => {
+                    self.delete_word_backward();
+                    return InputAction::Continue;
+                },
+                BareKey::Delete => {
+                    self.delete_word_forward();
+                    return InputAction::Continue;
+                },
+                _ => {},
+            }
+        }
+
+        // Check for Ctrl+Shift modifiers (alternative redo: Ctrl+Shift+Z)
+        if key.has_modifiers(&[KeyModifier::Ctrl, KeyModifier::Shift]) {
+            match key.bare_key {
+                BareKey::Char('Z') => {
+                    // Ctrl-Shift-Z: Redo (alternative)
+                    self.redo();
+                    return InputAction::Continue;
+                },
+                _ => {},
+            }
+        }
+
+        // Check for Alt modifiers
+        if key.has_modifiers(&[KeyModifier::Alt]) {
+            match key.bare_key {
+                BareKey::Left => {
+                    self.move_word_left();
+                    return InputAction::Continue;
+                },
+                BareKey::Right => {
+                    self.move_word_right();
+                    return InputAction::Continue;
+                },
+                BareKey::Backspace => {
+                    self.delete_word_backward();
+                    return InputAction::Continue;
+                },
+                BareKey::Delete => {
+                    self.delete_word_forward();
+                    return InputAction::Continue;
+                },
+                _ => {},
+            }
+        }
+
+        // Handle bare keys (no modifiers)
+        match key.bare_key {
+            BareKey::Enter => InputAction::Submit,
+            BareKey::Esc => InputAction::Cancel,
+            BareKey::Tab => InputAction::Complete,
+            BareKey::Backspace => {
+                self.backspace();
+                InputAction::Continue
+            },
+            BareKey::Delete => {
+                self.delete();
+                InputAction::Continue
+            },
+            BareKey::Left => {
+                self.move_left();
+                InputAction::Continue
+            },
+            BareKey::Right => {
+                self.move_right();
+                InputAction::Continue
+            },
+            BareKey::Home => {
+                self.move_to_start();
+                InputAction::Continue
+            },
+            BareKey::End => {
+                self.move_to_end();
+                InputAction::Continue
+            },
+            BareKey::Char(c) => {
+                self.insert_char(c);
+                InputAction::Continue
+            },
+            _ => InputAction::NoAction,
+        }
+    }
+
+    /// Helper: Convert character index to byte index
+    fn char_index_to_byte_index(&self, char_index: usize) -> usize {
+        self.buffer
+            .char_indices()
+            .nth(char_index)
+            .map(|(byte_idx, _)| byte_idx)
+            .unwrap_or(self.buffer.len())
+    }
+
+    /// Save current state to undo stack before making changes
+    fn save_undo_state(&mut self) {
+        if self.undo_stack.len() >= MAX_UNDO_STACK_SIZE {
+            self.undo_stack.remove(0);
+        }
+        self.undo_stack
+            .push((self.buffer.clone(), self.cursor_position));
+        self.redo_stack.clear();
+    }
+
+    /// Save state only if not coalescing with previous insert
+    fn save_undo_state_unless_coalescing(&mut self) {
+        if !self.last_edit_was_insert {
+            self.save_undo_state();
+        }
+        self.last_edit_was_insert = true;
+    }
+
+    /// Mark that a non-insert edit occurred (breaks coalescing)
+    fn break_coalescing(&mut self) {
+        self.last_edit_was_insert = false;
+    }
+
+    /// Undo last change
+    pub fn undo(&mut self) -> bool {
+        if let Some((buffer, cursor)) = self.undo_stack.pop() {
+            self.redo_stack
+                .push((self.buffer.clone(), self.cursor_position));
+            self.buffer = buffer;
+            self.cursor_position = cursor;
+            self.break_coalescing();
+            true
+        } else {
+            false
+        }
+    }
+
+    /// Redo last undone change
+    pub fn redo(&mut self) -> bool {
+        if let Some((buffer, cursor)) = self.redo_stack.pop() {
+            self.undo_stack
+                .push((self.buffer.clone(), self.cursor_position));
+            self.buffer = buffer;
+            self.cursor_position = cursor;
+            self.break_coalescing();
+            true
+        } else {
+            false
+        }
+    }
+
+    /// Check if undo is available
+    pub fn can_undo(&self) -> bool {
+        !self.undo_stack.is_empty()
+    }
+
+    /// Check if redo is available
+    pub fn can_redo(&self) -> bool {
+        !self.redo_stack.is_empty()
+    }
+
+    pub fn drain_text(&mut self) -> String {
+        self.cursor_position = 0;
+        self.buffer.drain(..).collect()
+    }
+}
+
+// run with:
+// cargo test --lib --target x86_64-unknown-linux-gnu
+//
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_new_and_empty() {
+        let input = TextInput::new("hello".to_string());
+        assert_eq!(input.get_text(), "hello");
+        assert_eq!(input.get_cursor_position(), 5);
+
+        let empty = TextInput::empty();
+        assert_eq!(empty.get_text(), "");
+        assert_eq!(empty.get_cursor_position(), 0);
+    }
+
+    #[test]
+    fn test_insert_char() {
+        let mut input = TextInput::new("helo".to_string());
+        input.cursor_position = 3; // Position after "hel"
+        input.insert_char('l');
+        assert_eq!(input.get_text(), "hello");
+        assert_eq!(input.get_cursor_position(), 4);
+    }
+
+    #[test]
+    fn test_backspace() {
+        let mut input = TextInput::new("hello".to_string());
+        input.backspace();
+        assert_eq!(input.get_text(), "hell");
+        assert_eq!(input.get_cursor_position(), 4);
+
+        // Backspace at start does nothing
+        input.cursor_position = 0;
+        input.backspace();
+        assert_eq!(input.get_text(), "hell");
+        assert_eq!(input.get_cursor_position(), 0);
+    }
+
+    #[test]
+    fn test_delete() {
+        let mut input = TextInput::new("hello".to_string());
+        input.cursor_position = 0;
+        input.delete();
+        assert_eq!(input.get_text(), "ello");
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Delete at end does nothing
+        input.move_to_end();
+        input.delete();
+        assert_eq!(input.get_text(), "ello");
+    }
+
+    #[test]
+    fn test_cursor_movement() {
+        let mut input = TextInput::new("hello".to_string());
+        assert_eq!(input.get_cursor_position(), 5);
+
+        input.move_left();
+        assert_eq!(input.get_cursor_position(), 4);
+
+        input.move_right();
+        assert_eq!(input.get_cursor_position(), 5);
+
+        input.move_to_start();
+        assert_eq!(input.get_cursor_position(), 0);
+
+        input.move_to_end();
+        assert_eq!(input.get_cursor_position(), 5);
+    }
+
+    #[test]
+    fn test_unicode_support() {
+        let mut input = TextInput::new("hello 🦀 world".to_string());
+        assert_eq!(input.get_cursor_position(), 13); // 13 characters
+
+        input.cursor_position = 6; // After "hello "
+        input.insert_char('🐱');
+        assert_eq!(input.get_text(), "hello 🐱🦀 world");
+    }
+
+    #[test]
+    fn test_word_jump_right() {
+        let mut input = TextInput::new("hello world foo bar".to_string());
+        input.cursor_position = 0;
+
+        // Jump from start to "world"
+        input.move_word_right();
+        assert_eq!(input.get_cursor_position(), 6); // After "hello "
+
+        // Jump to "foo"
+        input.move_word_right();
+        assert_eq!(input.get_cursor_position(), 12); // After "world "
+
+        // Jump to "bar"
+        input.move_word_right();
+        assert_eq!(input.get_cursor_position(), 16); // After "foo "
+
+        // Jump to end
+        input.move_word_right();
+        assert_eq!(input.get_cursor_position(), 19); // At end
+    }
+
+    #[test]
+    fn test_word_jump_left() {
+        let mut input = TextInput::new("hello world foo bar".to_string());
+        input.move_to_end();
+        assert_eq!(input.get_cursor_position(), 19);
+
+        // Jump back to "bar"
+        input.move_word_left();
+        assert_eq!(input.get_cursor_position(), 16); // Start of "bar"
+
+        // Jump back to "foo"
+        input.move_word_left();
+        assert_eq!(input.get_cursor_position(), 12); // Start of "foo"
+
+        // Jump back to "world"
+        input.move_word_left();
+        assert_eq!(input.get_cursor_position(), 6); // Start of "world"
+
+        // Jump back to "hello"
+        input.move_word_left();
+        assert_eq!(input.get_cursor_position(), 0); // Start of "hello"
+    }
+
+    #[test]
+    fn test_word_jump_with_multiple_spaces() {
+        let mut input = TextInput::new("hello   world".to_string());
+        input.cursor_position = 0;
+
+        // Jump over multiple spaces
+        input.move_word_right();
+        assert_eq!(input.get_cursor_position(), 8); // After "hello   ", at start of "world"
+
+        // Jump back should skip spaces
+        input.move_word_left();
+        assert_eq!(input.get_cursor_position(), 0); // Back to start of "hello"
+    }
+
+    #[test]
+    fn test_word_jump_boundaries() {
+        let mut input = TextInput::new("test".to_string());
+
+        // At start - word left does nothing
+        input.cursor_position = 0;
+        input.move_word_left();
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // At end - word right does nothing
+        input.move_to_end();
+        let end_pos = input.get_cursor_position();
+        input.move_word_right();
+        assert_eq!(input.get_cursor_position(), end_pos);
+    }
+
+    #[test]
+    fn test_up_down_arrows() {
+        let mut input = TextInput::new("hello world".to_string());
+
+        // Start in the middle
+        input.cursor_position = 5;
+        assert_eq!(input.get_cursor_position(), 5);
+
+        // Up arrow should go to start
+        input.move_to_start();
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Move back to middle
+        input.cursor_position = 5;
+
+        // Down arrow should go to end
+        input.move_to_end();
+        assert_eq!(input.get_cursor_position(), 11);
+    }
+
+    #[test]
+    fn test_delete_word_backward() {
+        let mut input = TextInput::new("hello world foo".to_string());
+
+        // Delete "foo" from end
+        input.move_to_end();
+        input.delete_word_backward();
+        assert_eq!(input.get_text(), "hello world ");
+        assert_eq!(input.get_cursor_position(), 12);
+
+        // Delete "world "
+        input.delete_word_backward();
+        assert_eq!(input.get_text(), "hello ");
+        assert_eq!(input.get_cursor_position(), 6);
+
+        // Delete "hello "
+        input.delete_word_backward();
+        assert_eq!(input.get_text(), "");
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Delete on empty buffer does nothing
+        input.delete_word_backward();
+        assert_eq!(input.get_text(), "");
+        assert_eq!(input.get_cursor_position(), 0);
+    }
+
+    #[test]
+    fn test_delete_word_backward_middle() {
+        let mut input = TextInput::new("hello world foo".to_string());
+
+        // Position in middle of "world"
+        input.cursor_position = 8; // After "hello wo"
+        input.delete_word_backward();
+        assert_eq!(input.get_text(), "hello rld foo");
+        assert_eq!(input.get_cursor_position(), 6); // After "hello "
+    }
+
+    #[test]
+    fn test_delete_word_forward() {
+        let mut input = TextInput::new("hello world foo".to_string());
+
+        // Delete "hello " from start
+        input.cursor_position = 0;
+        input.delete_word_forward();
+        assert_eq!(input.get_text(), "world foo");
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Delete "world "
+        input.delete_word_forward();
+        assert_eq!(input.get_text(), "foo");
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Delete "foo"
+        input.delete_word_forward();
+        assert_eq!(input.get_text(), "");
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Delete on empty buffer does nothing
+        input.delete_word_forward();
+        assert_eq!(input.get_text(), "");
+        assert_eq!(input.get_cursor_position(), 0);
+    }
+
+    #[test]
+    fn test_delete_word_forward_middle() {
+        let mut input = TextInput::new("hello world foo".to_string());
+
+        // Position in middle of "world"
+        input.cursor_position = 8; // After "hello wo"
+        input.delete_word_forward();
+        assert_eq!(input.get_text(), "hello wofoo");
+        assert_eq!(input.get_cursor_position(), 8); // Same position, text deleted forward
+    }
+
+    #[test]
+    fn test_delete_word_with_multiple_spaces() {
+        let mut input = TextInput::new("hello   world".to_string());
+
+        // Delete forward includes trailing spaces
+        input.cursor_position = 0;
+        input.delete_word_forward();
+        assert_eq!(input.get_text(), "world");
+        assert_eq!(input.get_cursor_position(), 0);
+    }
+
+    #[test]
+    fn test_undo_redo_basic() {
+        let mut input = TextInput::empty();
+
+        // Type "hello"
+        input.insert_char('h');
+        input.insert_char('e');
+        input.insert_char('l');
+        input.insert_char('l');
+        input.insert_char('o');
+        assert_eq!(input.get_text(), "hello");
+
+        // Undo should remove all characters (coalesced into one undo entry)
+        assert!(input.can_undo());
+        assert!(input.undo());
+        assert_eq!(input.get_text(), "");
+        assert_eq!(input.get_cursor_position(), 0);
+
+        // Redo should restore "hello"
+        assert!(input.can_redo());
+        assert!(input.redo());
+        assert_eq!(input.get_text(), "hello");
+        assert_eq!(input.get_cursor_position(), 5);
+    }
+
+    #[test]
+    fn test_undo_coalescing_breaks_on_cursor_move() {
+        let mut input = TextInput::empty();
+
+        // Type "he"
+        input.insert_char('h');
+        input.insert_char('e');
+
+        // Move cursor to start (breaks coalescing)
+        input.move_to_start();
+
+        // Type "llo"
+        input.insert_char('l');
+        input.insert_char('l');
+        input.insert_char('o');
+
+        assert_eq!(input.get_text(), "llohe");
+
+        // First undo removes "llo" (second coalesced group)
+        input.undo();
+        assert_eq!(input.get_text(), "he");
+
+        // Second undo removes "he" (first coalesced group)
+        input.undo();
+        assert_eq!(input.get_text(), "");
+    }
+
+    #[test]
+    fn test_undo_backspace() {
+        let mut input = TextInput::new("hello".to_string());
+
+        // Backspace once
+        input.backspace();
+        assert_eq!(input.get_text(), "hell");
+
+        // Undo should restore "hello"
+        input.undo();
+        assert_eq!(input.get_text(), "hello");
+        assert_eq!(input.get_cursor_position(), 5);
+    }
+
+    #[test]
+    fn test_undo_delete() {
+        let mut input = TextInput::new("hello".to_string());
+        input.cursor_position = 0;
+
+        // Delete first character
+        input.delete();
+        assert_eq!(input.get_text(), "ello");
+
+        // Undo should restore "hello"
+        input.undo();
+        assert_eq!(input.get_text(), "hello");
+        assert_eq!(input.get_cursor_position(), 0);
+    }
+
+    #[test]
+    fn test_undo_word_delete() {
+        let mut input = TextInput::new("hello world".to_string());
+
+        // Delete "world" backward
+        input.delete_word_backward();
+        assert_eq!(input.get_text(), "hello ");
+
+        // Undo should restore "hello world"
+        input.undo();
+        assert_eq!(input.get_text(), "hello world");
+        assert_eq!(input.get_cursor_position(), 11);
+    }
+
+    #[test]
+    fn test_undo_clear() {
+        let mut input = TextInput::new("hello world".to_string());
+
+        // Clear the buffer
+        input.clear();
+        assert_eq!(input.get_text(), "");
+
+        // Undo should restore the text
+        input.undo();
+        assert_eq!(input.get_text(), "hello world");
+    }
+
+    #[test]
+    fn test_undo_set_text() {
+        let mut input = TextInput::new("hello".to_string());
+
+        // Replace with new text
+        input.set_text("goodbye".to_string());
+        assert_eq!(input.get_text(), "goodbye");
+
+        // Undo should restore "hello"
+        input.undo();
+        assert_eq!(input.get_text(), "hello");
+    }
+
+    #[test]
+    fn test_redo_clears_on_new_edit() {
+        let mut input = TextInput::empty();
+
+        // Type "hello"
+        input.insert_char('h');
+        input.insert_char('e');
+        input.insert_char('l');
+        input.insert_char('l');
+        input.insert_char('o');
+
+        // Undo
+        input.undo();
+        assert_eq!(input.get_text(), "");
+        assert!(input.can_redo());
+
+        // Make a new edit (should clear redo stack)
+        input.insert_char('x');
+        assert!(!input.can_redo());
+    }
+
+    #[test]
+    fn test_multiple_undo_redo() {
+        let mut input = TextInput::empty();
+
+        // First edit: type "hello"
+        for c in "hello".chars() {
+            input.insert_char(c);
+        }
+
+        // Break coalescing
+        input.move_left();
+
+        // Second edit: type "world"
+        for c in "world".chars() {
+            input.insert_char(c);
+        }
+
+        assert_eq!(input.get_text(), "hellworldo");
+
+        // Undo "world"
+        input.undo();
+        assert_eq!(input.get_text(), "hello");
+
+        // Undo "hello"
+        input.undo();
+        assert_eq!(input.get_text(), "");
+
+        // Redo "hello"
+        input.redo();
+        assert_eq!(input.get_text(), "hello");
+
+        // Redo "world"
+        input.redo();
+        assert_eq!(input.get_text(), "hellworldo");
+    }
+
+    #[test]
+    fn test_undo_stack_limit() {
+        let mut input = TextInput::empty();
+
+        // Perform 102 separate edits (breaking coalescing each time)
+        for _i in 0..102 {
+            input.backspace(); // Break coalescing
+            input.insert_char('x');
+        }
+
+        // Should have at most 100 undo entries
+        let mut undo_count = 0;
+        while input.undo() {
+            undo_count += 1;
+        }
+
+        // We should have 100 undo entries (the stack limit)
+        // Plus the final state change from the last coalescing break
+        assert!(
+            undo_count <= 100,
+            "Undo count should be at most 100, got {}",
+            undo_count
+        );
+    }
+
+    #[test]
+    fn test_undo_redo_empty_stack() {
+        let mut input = TextInput::empty();
+
+        // Undo on empty stack should return false
+        assert!(!input.can_undo());
+        assert!(!input.undo());
+
+        // Redo on empty stack should return false
+        assert!(!input.can_redo());
+        assert!(!input.redo());
+    }
+
+    #[test]
+    fn test_undo_restores_cursor_position() {
+        let mut input = TextInput::new("hello world".to_string());
+
+        // Move cursor to position 5 (before "world")
+        input.cursor_position = 5;
+
+        // Insert a space
+        input.insert_char(' ');
+        assert_eq!(input.get_text(), "hello  world");
+        assert_eq!(input.get_cursor_position(), 6);
+
+        // Undo should restore both text and cursor position
+        input.undo();
+        assert_eq!(input.get_text(), "hello world");
+        assert_eq!(input.get_cursor_position(), 5);
+    }
+
+    #[test]
+    fn test_coalescing_consecutive_inserts() {
+        let mut input = TextInput::empty();
+
+        // Type several characters
+        input.insert_char('a');
+        input.insert_char('b');
+        input.insert_char('c');
+
+        assert_eq!(input.get_text(), "abc");
+
+        // Single undo should remove all three (they were coalesced)
+        input.undo();
+        assert_eq!(input.get_text(), "");
+
+        // No more undo available
+        assert!(!input.can_undo());
+    }
+
+    #[test]
+    fn test_backspace_breaks_coalescing() {
+        let mut input = TextInput::empty();
+
+        // Type "ab"
+        input.insert_char('a');
+        input.insert_char('b');
+
+        // Backspace
+        input.backspace();
+        assert_eq!(input.get_text(), "a");
+
+        // Type "c"
+        input.insert_char('c');
+        assert_eq!(input.get_text(), "ac");
+
+        // Undo should remove just "c"
+        input.undo();
+        assert_eq!(input.get_text(), "a");
+
+        // Undo should remove backspace operation
+        input.undo();
+        assert_eq!(input.get_text(), "ab");
+
+        // Undo should remove "ab"
+        input.undo();
+        assert_eq!(input.get_text(), "");
+    }
+}