Indicate to the user when text is copied to the clipboard (#642)

* Indicate to the user when text is copied to the clipboard

- broadcast CopyToClipboard event to plugins after selection has been
  copied, and InputReceived event after any input has been received.
- add new ClientToServerMsg InputReceived
- subscribe status-bar plugin to new events, modify second line after
  CopyToClipboard, reset it on InputReceived.

* remove unnecessary InputReceived ClientToServerMsg

- use existing Actions instead to know that user input has been received

* make status bar text copied hint bold green

* cleanup

* cleanup

* cleanup

5 files changed, 47 insertions, 5 deletions

diff --git a/default-plugins/status-bar/src/main.rs b/default-plugins/status-bar/src/main.rs
index dba373f6b..d2c6d82b5 100644
--- a/default-plugins/status-bar/src/main.rs
+++ b/default-plugins/status-bar/src/main.rs
@@ -8,7 +8,7 @@ use zellij_tile::prelude::*;
 use zellij_tile_utils::style;
 
 use first_line::{ctrl_keys, superkey};
-use second_line::keybinds;
+use second_line::{keybinds, text_copied_hint};
 
 // for more of these, copy paste from: https://en.wikipedia.org/wiki/Box-drawing_character
 static ARROW_SEPARATOR: &str = "";
@@ -17,6 +17,7 @@ static MORE_MSG: &str = " ... ";
 #[derive(Default)]
 struct State {
     mode_info: ModeInfo,
+    diplay_text_copied_hint: bool,
 }
 
 register_plugin!(State);
@@ -136,12 +137,25 @@ impl ZellijPlugin for State {
         set_selectable(false);
         set_invisible_borders(true);
         set_fixed_height(2);
-        subscribe(&[EventType::ModeUpdate]);
+        subscribe(&[
+            EventType::ModeUpdate,
+            EventType::CopyToClipboard,
+            EventType::InputReceived,
+        ]);
     }
 
     fn update(&mut self, event: Event) {
-        if let Event::ModeUpdate(mode_info) = event {
-            self.mode_info = mode_info;
+        match event {
+            Event::ModeUpdate(mode_info) => {
+                self.mode_info = mode_info;
+            }
+            Event::CopyToClipboard => {
+                self.diplay_text_copied_hint = true;
+            }
+            Event::InputReceived => {
+                self.diplay_text_copied_hint = false;
+            }
+            _ => {}
         }
     }
 
@@ -161,7 +175,11 @@ impl ZellijPlugin for State {
         );
 
         let first_line = format!("{}{}", superkey, ctrl_keys);
-        let second_line = keybinds(&self.mode_info, cols);
+        let second_line = if self.diplay_text_copied_hint {
+            text_copied_hint(&self.mode_info.palette)
+        } else {
+            keybinds(&self.mode_info, cols)
+        };
 
         // [48;5;238m is gray background, [0K is so that it fills the rest of the line
         // [m is background reset, [0K is so that it clears the rest of the line
diff --git a/default-plugins/status-bar/src/second_line.rs b/default-plugins/status-bar/src/second_line.rs
index 750df77b6..d73cb2874 100644
--- a/default-plugins/status-bar/src/second_line.rs
+++ b/default-plugins/status-bar/src/second_line.rs
@@ -375,3 +375,15 @@ pub fn keybinds(help: &ModeInfo, max_width: usize) -> LinePart {
     }
     best_effort_shortcut_list(help, max_width)
 }
+
+pub fn text_copied_hint(palette: &Palette) -> LinePart {
+    let hint = " Text copied to clipboard";
+    let green_color = match palette.green {
+        PaletteColor::Rgb((r, g, b)) => RGB(r, g, b),
+        PaletteColor::EightBit(color) => Fixed(color),
+    };
+    LinePart {
+        part: format!("{}", Style::new().fg(green_color).bold().paint(hint)),
+        len: hint.len(),
+    }
+}
diff --git a/zellij-server/src/route.rs b/zellij-server/src/route.rs
index 3959a19aa..20f14c3bd 100644
--- a/zellij-server/src/route.rs
+++ b/zellij-server/src/route.rs
@@ -23,6 +23,10 @@ fn route_action(
     to_server: &SenderWithContext<ServerInstruction>,
 ) -> bool {
     let mut should_break = false;
+    session
+        .senders
+        .send_to_plugin(PluginInstruction::Update(None, Event::InputReceived))
+        .unwrap();
     match action {
         Action::Write(val) => {
             session
diff --git a/zellij-server/src/tab.rs b/zellij-server/src/tab.rs
index 8f12f8836..6ecf33b71 100644
--- a/zellij-server/src/tab.rs
+++ b/zellij-server/src/tab.rs
@@ -2871,6 +2871,9 @@ impl Tab {
         let selected_text = self.get_active_pane().and_then(|p| p.get_selected_text());
         if let Some(selected_text) = selected_text {
             self.write_selection_to_clipboard(&selected_text);
+            self.senders
+                .send_to_plugin(PluginInstruction::Update(None, Event::CopyToClipboard))
+                .unwrap();
         }
     }
 
@@ -2879,6 +2882,9 @@ impl Tab {
         self.senders
             .send_to_server(ServerInstruction::Render(Some(output)))
             .unwrap();
+        self.senders
+            .send_to_plugin(PluginInstruction::Update(None, Event::CopyToClipboard))
+            .unwrap();
     }
     fn is_inside_viewport(&self, pane_id: &PaneId) -> bool {
         let pane_position_and_size = self.panes.get(pane_id).unwrap().position_and_size();
diff --git a/zellij-tile/src/data.rs b/zellij-tile/src/data.rs
index cdf57e69f..b22be626d 100644
--- a/zellij-tile/src/data.rs
+++ b/zellij-tile/src/data.rs
@@ -33,6 +33,8 @@ pub enum Event {
     TabUpdate(Vec<TabInfo>),
     KeyPress(Key),
     Timer(f64),
+    CopyToClipboard,
+    InputReceived,
 }
 
 /// Describes the different input modes, which change the way that keystrokes will be interpreted.