feat(plugins): async plugin loading (#2327)

* work

* refactor(plugins): break down start plugin async function

* work

* loading messages

* nice ui

* floating panes and error handling

* cleanups and conflicting plugin/direction

* find exact pane when relayouting

* fix plugin pane titles

* kill loading tasks on exit

* refactor: move stuff around

* style(fmt): rustfmt

* various fixes and refactors

7 files changed, 38 insertions, 2 deletions

diff --git a/zellij-utils/assets/plugins/compact-bar.wasm b/zellij-utils/assets/plugins/compact-bar.wasm
index 9c2b0642d..c69ee88e3 100755
--- a/zellij-utils/assets/plugins/compact-bar.wasm
+++ b/zellij-utils/assets/plugins/compact-bar.wasm
diff --git a/zellij-utils/assets/plugins/status-bar.wasm b/zellij-utils/assets/plugins/status-bar.wasm
index b6fee8393..a9ae76916 100755
--- a/zellij-utils/assets/plugins/status-bar.wasm
+++ b/zellij-utils/assets/plugins/status-bar.wasm
diff --git a/zellij-utils/assets/plugins/strider.wasm b/zellij-utils/assets/plugins/strider.wasm
index b5dc726a0..5e4a54f95 100755
--- a/zellij-utils/assets/plugins/strider.wasm
+++ b/zellij-utils/assets/plugins/strider.wasm
diff --git a/zellij-utils/assets/plugins/tab-bar.wasm b/zellij-utils/assets/plugins/tab-bar.wasm
index 2df1fe6a2..8ea487d87 100755
--- a/zellij-utils/assets/plugins/tab-bar.wasm
+++ b/zellij-utils/assets/plugins/tab-bar.wasm
diff --git a/zellij-utils/src/cli.rs b/zellij-utils/src/cli.rs
index 3947dfad3..f232438b9 100644
--- a/zellij-utils/src/cli.rs
+++ b/zellij-utils/src/cli.rs
@@ -254,6 +254,9 @@ pub enum CliAction {
         #[clap(last(true))]
         command: Vec<String>,
 
+        #[clap(short, long, conflicts_with("command"), conflicts_with("direction"))]
+        plugin: Option<String>,
+
         /// Change the working directory of the new pane
         #[clap(long, value_parser)]
         cwd: Option<PathBuf>,
diff --git a/zellij-utils/src/errors.rs b/zellij-utils/src/errors.rs
index f1522c1de..8a0f63317 100644
--- a/zellij-utils/src/errors.rs
+++ b/zellij-utils/src/errors.rs
@@ -324,6 +324,11 @@ pub enum ScreenContext {
     PreviousSwapLayout,
     NextSwapLayout,
     QueryTabNames,
+    NewTiledPluginPane,
+    NewFloatingPluginPane,
+    AddPlugin,
+    UpdatePluginLoadingStage,
+    ProgressPluginLoadingOffset,
 }
 
 /// Stack call representations corresponding to the different types of [`PtyInstruction`]s.
@@ -354,6 +359,7 @@ pub enum PluginContext {
     AddClient,
     RemoveClient,
     NewTab,
+    ApplyCachedEvents,
 }
 
 /// Stack call representations corresponding to the different types of [`ClientInstruction`]s.
@@ -399,6 +405,8 @@ pub enum PtyWriteContext {
 #[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 pub enum BackgroundJobContext {
     DisplayPaneError,
+    AnimatePluginLoading,
+    StopPluginLoadingAnimation,
     Exit,
 }
 
diff --git a/zellij-utils/src/input/actions.rs b/zellij-utils/src/input/actions.rs
index b2ec8d828..8e614d6de 100644
--- a/zellij-utils/src/input/actions.rs
+++ b/zellij-utils/src/input/actions.rs
@@ -2,7 +2,8 @@
 
 use super::command::RunCommandAction;
 use super::layout::{
-    FloatingPaneLayout, Layout, SwapFloatingLayout, SwapTiledLayout, TiledPaneLayout,
+    FloatingPaneLayout, Layout, RunPluginLocation, SwapFloatingLayout, SwapTiledLayout,
+    TiledPaneLayout,
 };
 use crate::cli::CliAction;
 use crate::data::InputMode;
@@ -225,6 +226,9 @@ pub enum Action {
     NextSwapLayout,
     /// Query all tab names
     QueryTabNames,
+    /// Open a new tiled (embedded, non-floating) plugin pane
+    NewTiledPluginPane(RunPluginLocation, Option<String>), // String is an optional name
+    NewFloatingPluginPane(RunPluginLocation, Option<String>), // String is an optional name
 }
 
 impl Action {
@@ -270,13 +274,34 @@ impl Action {
             CliAction::NewPane {
                 direction,
                 command,
+                plugin,
                 cwd,
                 floating,
                 name,
                 close_on_exit,
                 start_suspended,
             } => {
-                if !command.is_empty() {
+                if let Some(plugin) = plugin {
+                    if floating {
+                        let plugin = RunPluginLocation::parse(&plugin).map_err(|e| {
+                            format!("Failed to parse plugin loction {plugin}: {}", e)
+                        })?;
+                        Ok(vec![Action::NewFloatingPluginPane(plugin, name)])
+                    } else {
+                        let plugin = RunPluginLocation::parse(&plugin).map_err(|e| {
+                            format!("Failed to parse plugin location {plugin}: {}", e)
+                        })?;
+                        // it is intentional that a new tiled plugin pane cannot include a
+                        // direction
+                        // this is because the cli client opening a tiled plugin pane is a
+                        // different client than the one opening the pane, and this can potentially
+                        // create very confusing races if the client changes focus while the plugin
+                        // is being loaded
+                        // this is not the case with terminal panes for historical reasons of
+                        // backwards compatibility to a time before we had auto layouts
+                        Ok(vec![Action::NewTiledPluginPane(plugin, name)])
+                    }
+                } else if !command.is_empty() {
                     let mut command = command.clone();
                     let (command, args) = (PathBuf::from(command.remove(0)), command);
                     let current_dir = get_current_dir();