feat(ux): tmux mode (#1073)

* work

* basic tmux move and functionality

* tmux mode ui

* rustfmt

12 files changed, 282 insertions, 5 deletions

diff --git a/assets/plugins/status-bar.wasm b/assets/plugins/status-bar.wasm
index 03a0cad8d..53d84a2cd 100755
--- a/assets/plugins/status-bar.wasm
+++ b/assets/plugins/status-bar.wasm
diff --git a/assets/plugins/strider.wasm b/assets/plugins/strider.wasm
index f06cb8e14..2e7d47d48 100755
--- a/assets/plugins/strider.wasm
+++ b/assets/plugins/strider.wasm
diff --git a/assets/plugins/tab-bar.wasm b/assets/plugins/tab-bar.wasm
index 2bd618b7c..366a71a19 100755
--- a/assets/plugins/tab-bar.wasm
+++ b/assets/plugins/tab-bar.wasm
diff --git a/default-plugins/status-bar/src/first_line.rs b/default-plugins/status-bar/src/first_line.rs
index cdb1decee..ed67e5cc5 100644
--- a/default-plugins/status-bar/src/first_line.rs
+++ b/default-plugins/status-bar/src/first_line.rs
@@ -369,5 +369,20 @@ pub fn ctrl_keys(help: &ModeInfo, max_len: usize, separator: &str) -> LinePart {
             colored_elements,
             separator,
         ),
+        InputMode::Tmux => key_indicators(
+            max_len,
+            &[
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Lock),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Pane),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Tab),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Resize),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Move),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Scroll),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Session),
+                CtrlKeyShortcut::new(CtrlKeyMode::Unselected, CtrlKeyAction::Quit),
+            ],
+            colored_elements,
+            separator,
+        ),
     }
 }
diff --git a/default-plugins/status-bar/src/second_line.rs b/default-plugins/status-bar/src/second_line.rs
index abd2f8c3f..d33efc02e 100644
--- a/default-plugins/status-bar/src/second_line.rs
+++ b/default-plugins/status-bar/src/second_line.rs
@@ -208,6 +208,7 @@ fn full_shortcut_list(help: &ModeInfo, tip: TipFn) -> LinePart {
     match help.mode {
         InputMode::Normal => tip(help.palette),
         InputMode::Locked => locked_interface_indication(help.palette),
+        InputMode::Tmux => full_tmux_mode_indication(help),
         InputMode::RenamePane => full_shortcut_list_nonstandard_mode(select_pane_shortcut)(help),
         _ => full_shortcut_list_nonstandard_mode(confirm_pane_selection)(help),
     }
@@ -234,6 +235,7 @@ fn shortened_shortcut_list(help: &ModeInfo, tip: TipFn) -> LinePart {
     match help.mode {
         InputMode::Normal => tip(help.palette),
         InputMode::Locked => locked_interface_indication(help.palette),
+        InputMode::Tmux => short_tmux_mode_indication(help),
         InputMode::RenamePane => {
             shortened_shortcut_list_nonstandard_mode(select_pane_shortcut)(help)
         }
@@ -266,6 +268,22 @@ fn best_effort_shortcut_list_nonstandard_mode(
     }
 }
 
+fn best_effort_tmux_shortcut_list(help: &ModeInfo, max_len: usize) -> LinePart {
+    let mut line_part = tmux_mode_indication(help);
+    for (i, (letter, description)) in help.keybinds.iter().enumerate() {
+        let shortcut = first_word_shortcut(i == 0, letter, description, help.palette);
+        if line_part.len + shortcut.len + MORE_MSG.chars().count() > max_len {
+            // TODO: better
+            line_part.part = format!("{}{}", line_part.part, MORE_MSG);
+            line_part.len += MORE_MSG.chars().count();
+            break;
+        }
+        line_part.len += shortcut.len;
+        line_part.part = format!("{}{}", line_part.part, shortcut);
+    }
+    line_part
+}
+
 fn best_effort_shortcut_list(help: &ModeInfo, tip: TipFn, max_len: usize) -> LinePart {
     match help.mode {
         InputMode::Normal => {
@@ -284,6 +302,7 @@ fn best_effort_shortcut_list(help: &ModeInfo, tip: TipFn, max_len: usize) -> Lin
                 LinePart::default()
             }
         }
+        InputMode::Tmux => best_effort_tmux_shortcut_list(help, max_len),
         InputMode::RenamePane => {
             best_effort_shortcut_list_nonstandard_mode(select_pane_shortcut)(help, max_len)
         }
@@ -377,6 +396,90 @@ pub fn fullscreen_panes_to_hide(palette: &Palette, panes_to_hide: usize) -> Line
     }
 }
 
+pub fn tmux_mode_indication(help: &ModeInfo) -> LinePart {
+    let white_color = match help.palette.white {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+    let orange_color = match help.palette.orange {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+
+    let shortcut_left_separator = Style::new().fg(white_color).bold().paint(" (");
+    let shortcut_right_separator = Style::new().fg(white_color).bold().paint("): ");
+    let tmux_mode_text = "TMUX MODE";
+    let tmux_mode_indicator = Style::new().fg(orange_color).bold().paint(tmux_mode_text);
+    let line_part = LinePart {
+        part: format!(
+            "{}{}{}",
+            shortcut_left_separator, tmux_mode_indicator, shortcut_right_separator
+        ),
+        len: tmux_mode_text.chars().count() + 5, // 2 for the separators, 3 for the colon and following space
+    };
+    line_part
+}
+
+pub fn full_tmux_mode_indication(help: &ModeInfo) -> LinePart {
+    let white_color = match help.palette.white {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+    let orange_color = match help.palette.orange {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+
+    let shortcut_left_separator = Style::new().fg(white_color).bold().paint(" (");
+    let shortcut_right_separator = Style::new().fg(white_color).bold().paint("): ");
+    let tmux_mode_text = "TMUX MODE";
+    let tmux_mode_indicator = Style::new().fg(orange_color).bold().paint(tmux_mode_text);
+    let mut line_part = LinePart {
+        part: format!(
+            "{}{}{}",
+            shortcut_left_separator, tmux_mode_indicator, shortcut_right_separator
+        ),
+        len: tmux_mode_text.chars().count() + 5, // 2 for the separators, 3 for the colon and following space
+    };
+
+    for (i, (letter, description)) in help.keybinds.iter().enumerate() {
+        let shortcut = full_length_shortcut(i == 0, letter, description, help.palette);
+        line_part.len += shortcut.len;
+        line_part.part = format!("{}{}", line_part.part, shortcut,);
+    }
+    line_part
+}
+
+pub fn short_tmux_mode_indication(help: &ModeInfo) -> LinePart {
+    let white_color = match help.palette.white {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+    let orange_color = match help.palette.orange {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+
+    let shortcut_left_separator = Style::new().fg(white_color).bold().paint(" (");
+    let shortcut_right_separator = Style::new().fg(white_color).bold().paint("): ");
+    let tmux_mode_text = "TMUX MODE";
+    let tmux_mode_indicator = Style::new().fg(orange_color).bold().paint(tmux_mode_text);
+    let mut line_part = LinePart {
+        part: format!(
+            "{}{}{}",
+            shortcut_left_separator, tmux_mode_indicator, shortcut_right_separator
+        ),
+        len: tmux_mode_text.chars().count() + 5, // 2 for the separators, 3 for the colon and following space
+    };
+
+    for (i, (letter, description)) in help.keybinds.iter().enumerate() {
+        let shortcut = first_word_shortcut(i == 0, letter, description, help.palette);
+        line_part.len += shortcut.len;
+        line_part.part = format!("{}{}", line_part.part, shortcut);
+    }
+    line_part
+}
+
 pub fn locked_fullscreen_panes_to_hide(palette: &Palette, panes_to_hide: usize) -> LinePart {
     let white_color = match palette.white {
         PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
diff --git a/src/tests/e2e/cases.rs b/src/tests/e2e/cases.rs
index e2548b52d..d06709517 100644
--- a/src/tests/e2e/cases.rs
+++ b/src/tests/e2e/cases.rs
@@ -19,10 +19,12 @@ pub const MOVE_FOCUS_LEFT_IN_NORMAL_MODE: [u8; 2] = [27, 104]; // alt-h
 pub const MOVE_FOCUS_RIGHT_IN_NORMAL_MODE: [u8; 2] = [27, 108]; // alt-l
 
 pub const PANE_MODE: [u8; 1] = [16]; // ctrl-p
+pub const TMUX_MODE: [u8; 1] = [2]; // ctrl-b
 pub const SPAWN_TERMINAL_IN_PANE_MODE: [u8; 1] = [110]; // n
 pub const MOVE_FOCUS_IN_PANE_MODE: [u8; 1] = [112]; // p
 pub const SPLIT_DOWN_IN_PANE_MODE: [u8; 1] = [100]; // d
 pub const SPLIT_RIGHT_IN_PANE_MODE: [u8; 1] = [114]; // r
+pub const SPLIT_RIGHT_IN_TMUX_MODE: [u8; 1] = [37]; // %
 pub const TOGGLE_ACTIVE_TERMINAL_FULLSCREEN_IN_PANE_MODE: [u8; 1] = [102]; // f
 pub const TOGGLE_FLOATING_PANES: [u8; 1] = [119]; // w
 pub const CLOSE_PANE_IN_PANE_MODE: [u8; 1] = [120]; // x
@@ -1748,3 +1750,50 @@ pub fn focus_tab_with_layout() {
     };
     assert_snapshot!(last_snapshot);
 }
+
+#[test]
+#[ignore]
+pub fn tmux_mode() {
+    let fake_win_size = Size {
+        cols: 120,
+        rows: 24,
+    };
+
+    let mut test_attempts = 10;
+    let last_snapshot = loop {
+        RemoteRunner::kill_running_sessions(fake_win_size);
+        let mut runner = RemoteRunner::new(fake_win_size).add_step(Step {
+            name: "Split pane to the right",
+            instruction: |mut remote_terminal: RemoteTerminal| -> bool {
+                let mut step_is_complete = false;
+                if remote_terminal.status_bar_appears() && remote_terminal.cursor_position_is(3, 2)
+                {
+                    remote_terminal.send_key(&TMUX_MODE);
+                    remote_terminal.send_key(&SPLIT_RIGHT_IN_TMUX_MODE);
+                    // back to normal mode after split
+                    step_is_complete = true;
+                }
+                step_is_complete
+            },
+        });
+        runner.run_all_steps();
+        let last_snapshot = runner.take_snapshot_after(Step {
+            name: "Wait for new pane to appear",
+            instruction: |remote_terminal: RemoteTerminal| -> bool {
+                let mut step_is_complete = false;
+                if remote_terminal.cursor_position_is(63, 2) && remote_terminal.tip_appears() {
+                    // cursor is in the newly opened second pane
+                    step_is_complete = true;
+                }
+                step_is_complete
+            },
+        });
+        if runner.test_timed_out && test_attempts > 0 {
+            test_attempts -= 1;
+            continue;
+        } else {
+            break last_snapshot;
+        }
+    };
+    assert_snapshot!(last_snapshot);
+}
diff --git a/src/tests/e2e/snapshots/zellij__tests__e2e__cases__tmux_mode.snap b/src/tests/e2e/snapshots/zellij__tests__e2e__cases__tmux_mode.snap
new file mode 100644
index 000000000..a9510a196
--- /dev/null
+++ b/src/tests/e2e/snapshots/zellij__tests__e2e__cases__tmux_mode.snap
@@ -0,0 +1,29 @@
+---
+source: src/tests/e2e/cases.rs
+expression: last_snapshot
+
+---
+ Zellij (e2e-test)  Tab #1                                                                                            
+┌ Pane #1 ─────────────────────────────────────────────────┐┌ Pane #2 ─────────────────────────────────────────────────┐
+│$                                                         ││$ █                                                       │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+│                                                          ││                                                          │
+└──────────────────────────────────────────────────────────┘└──────────────────────────────────────────────────────────┘
+ Ctrl + <g> LOCK  <p> PANE  <t> TAB  <n> RESIZE  <h> MOVE  <s> SCROLL  <o> SESSION  <q> QUIT           
+ Tip: Alt + <n> => new pane. Alt + <[] or hjkl> => navigate. Alt + <+-> => resize pane.                                 
diff --git a/zellij-server/src/panes/plugin_pane.rs b/zellij-server/src/panes/plugin_pane.rs
index 4356ec650..b7389bcb7 100644
--- a/zellij-server/src/panes/plugin_pane.rs
+++ b/zellij-server/src/panes/plugin_pane.rs
@@ -329,7 +329,7 @@ impl Pane for PluginPane {
             .unwrap();
     }
     fn clear_scroll(&mut self) {
-        unimplemented!();
+        // noop
     }
     fn start_selection(&mut self, start: &Position, client_id: ClientId) {
         self.send_plugin_instructions
diff --git a/zellij-tile/src/data.rs b/zellij-tile/src/data.rs
index 9b9f67b28..4ef8e493c 100644
--- a/zellij-tile/src/data.rs
+++ b/zellij-tile/src/data.rs
@@ -120,6 +120,9 @@ pub enum InputMode {
     /// `Prompt` mode allows interacting with active prompts.
     #[serde(alias = "prompt")]
     Prompt,
+    /// `Tmux` mode allows for basic tmux keybindings functionality
+    #[serde(alias = "tmux")]
+    Tmux,
 }
 
 impl Default for InputMode {
@@ -164,6 +167,7 @@ impl FromStr for InputMode {
             "renametab" => Ok(InputMode::RenameTab),
             "session" => Ok(InputMode::Session),
             "move" => Ok(InputMode::Move),
+            "tmux" => Ok(InputMode::Tmux),
             "prompt" => Ok(InputMode::Prompt),
             "renamepane" => Ok(InputMode::RenamePane),
             e => Err(e.to_string().into()),
diff --git a/zellij-utils/assets/config/default.yaml b/zellij-utils/assets/config/default.yaml
index 7123e362d..ba3a89163 100644
--- a/zellij-utils/assets/config/default.yaml
+++ b/zellij-utils/assets/config/default.yaml
@@ -22,6 +22,8 @@ keybinds:
           key: [Ctrl: 'o',]
         - action: [SwitchToMode: Move,]
           key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tmux,]
+          key: [Ctrl: 'b',]
         - action: [Quit,]
           key: [Ctrl: 'q',]
         - action: [NewPane: ]
@@ -62,6 +64,8 @@ keybinds:
           key: [Ctrl: 'o',]
         - action: [SwitchToMode: Move,]
           key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tmux,]
+          key: [Ctrl: 'b',]
         - action: [Quit]
           key: [Ctrl: 'q']
         - action: [Resize: Left,]
@@ -113,6 +117,8 @@ keybinds:
           key: [Ctrl: 'o',]
         - action: [SwitchToMode: Move,]
           key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tmux,]
+          key: [Ctrl: 'b',]
         - action: [Quit,]
           key: [Ctrl: 'q',]
         - action: [MoveFocus: Left,]
@@ -223,6 +229,8 @@ keybinds:
           key: [Ctrl: 's']
         - action: [SwitchToMode: Move,]
           key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tmux,]
+          key: [Ctrl: 'b',]
         - action: [SwitchToMode: Session,]
           key: [Ctrl: 'o',]
         - action: [SwitchToMode: RenameTab, TabNameInput: [0],]
@@ -290,6 +298,8 @@ keybinds:
           key: [Ctrl: 'p',]
         - action: [SwitchToMode: Move,]
           key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tmux,]
+          key: [Ctrl: 'b',]
         - action: [SwitchToMode: Session,]
           key: [Ctrl: 'o',]
         - action: [SwitchToMode: Resize,]
@@ -389,6 +399,8 @@ keybinds:
           key: [Ctrl: 'p',]
         - action: [SwitchToMode: Move,]
           key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tmux,]
+          key: [Ctrl: 'b',]
         - action: [SwitchToMode: Tab,]
           key: [Ctrl: 't',]
         - action: [SwitchToMode: Normal,]
@@ -419,6 +431,65 @@ keybinds:
           key: [ Alt: '+']
         - action: [Resize: Decrease,]
           key: [ Alt: '-']
+    tmux:
+        - action: [SwitchToMode: Locked,]
+          key: [Ctrl: 'g']
+        - action: [SwitchToMode: Resize,]
+          key: [Ctrl: 'n',]
+        - action: [SwitchToMode: Pane,]
+          key: [Ctrl: 'p',]
+        - action: [SwitchToMode: Move,]
+          key: [Ctrl: 'h',]
+        - action: [SwitchToMode: Tab,]
+          key: [Ctrl: 't',]
+        - action: [SwitchToMode: Normal,]
+          key: [Ctrl: 'o', Char: "\n", Char: ' ', Esc]
+        - action: [SwitchToMode: Scroll,]
+          key: [Ctrl: 's']
+        - action: [Quit,]
+          key: [Ctrl: 'q',]
+        - action: [NewPane: Down, SwitchToMode: Normal,]
+          key: [Char: "\"",]
+        - action: [NewPane: Right, SwitchToMode: Normal,]
+          key: [Char: '%',]
+        - action: [ToggleFocusFullscreen, SwitchToMode: Normal,]
+          key: [Char: 'z',]
+        - action: [NewTab: , SwitchToMode: Normal,]
+          key: [ Char: 'c',]
+        - action: [SwitchToMode: RenameTab, TabNameInput: [0],]
+          key: [Char: ',']
+        - action: [GoToPreviousTab, SwitchToMode: Normal,]
+          key: [ Char: 'p']
+        - action: [GoToNextTab, SwitchToMode: Normal,]
+          key: [ Char: 'n']
+        - action: [MoveFocus: Left, SwitchToMode: Normal,]
+          key: [ Left,]
+        - action: [MoveFocus: Right, SwitchToMode: Normal,]
+          key: [ Right,]
+        - action: [MoveFocus: Down, SwitchToMode: Normal,]
+          key: [ Down,]
+        - action: [MoveFocus: Up, SwitchToMode: Normal,]
+          key: [ Up,]
+        - action: [NewPane: ,]
+          key: [ Alt: 'n',]
+        - action: [MoveFocus: Left,]
+          key: [ Alt: 'h',]
+        - action: [MoveFocus: Right,]
+          key: [ Alt: 'l',]
+        - action: [MoveFocus: Down,]
+          key: [ Alt: 'j',]
+        - action: [MoveFocus: Up,]
+          key: [ Alt: 'k',]
+        - action: [FocusPreviousPane,]
+          key: [ Alt: '[',]
+        - action: [FocusNextPane,]
+          key: [ Alt: ']',]
+        - action: [Resize: Increase,]
+          key: [ Alt: '=']
+        - action: [Resize: Increase,]
+          key: [ Alt: '+']
+        - action: [Resize: Decrease,]
+          key: [ Alt: '-']
 plugins:
     - path: tab-bar
       tag: tab-bar
diff --git a/zellij-utils/src/input/keybinds.rs b/zellij-utils/src/input/keybinds.rs
index 5e8ba033e..4838fdf64 100644
--- a/zellij-utils/src/input/keybinds.rs
+++ b/zellij-utils/src/input/keybinds.rs
@@ -199,10 +199,6 @@ impl Keybinds {
                 .0
                 .get(mode)
                 .unwrap_or({
-                    log::warn!(
-                        "The following mode has no action associated with it: {:?}",
-                        mode
-                    );
                     // create a dummy mode to recover from
                     &ModeKeybinds::new()
                 })
diff --git a/zellij-utils/src/input/mod.rs b/zellij-utils/src/input/mod.rs
index f8626e04a..391fea7b4 100644
--- a/zellij-utils/src/input/mod.rs
+++ b/zellij-utils/src/input/mod.rs
@@ -60,6 +60,16 @@ pub fn get_mode_info(
         InputMode::RenameTab => vec![("Enter".to_string(), "when done".to_string())],
         InputMode::RenamePane => vec![("Enter".to_string(), "when done".to_string())],
         InputMode::Session => vec![("d".to_string(), "Detach".to_string())],
+        InputMode::Tmux => vec![
+            ("←↓↑→".to_string(), "Move focus".to_string()),
+            ("\"".to_string(), "Split Down".to_string()),
+            ("%".to_string(), "Split Right".to_string()),
+            ("z".to_string(), "Fullscreen".to_string()),
+            ("c".to_string(), "New Tab".to_string()),
+            (",".to_string(), "Rename Tab".to_string()),
+            ("p".to_string(), "Previous Tab".to_string()),
+            ("n".to_string(), "Next Tab".to_string()),
+        ],
     };
 
     let session_name = envs::get_session_name().ok();