feat(panes): in place run (#2795)

* prototype

* fix tests

* add to all the things except plugins

* add in-place to plugin commands

* fix launch-or-focus should_float and in place behavior

* various cleanups

* style(fmt): rustfmt

17 files changed, 189 insertions, 7 deletions

diff --git a/zellij-utils/assets/prost/api.action.rs b/zellij-utils/assets/prost/api.action.rs
index 9099b6ef5..97976393b 100644
--- a/zellij-utils/assets/prost/api.action.rs
+++ b/zellij-utils/assets/prost/api.action.rs
@@ -137,6 +137,8 @@ pub struct LaunchOrFocusPluginPayload {
     pub plugin_configuration: ::core::option::Option<PluginConfiguration>,
     #[prost(bool, tag = "4")]
     pub move_to_focused_tab: bool,
+    #[prost(bool, tag = "5")]
+    pub should_open_in_place: bool,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
 #[derive(Clone, PartialEq, ::prost::Message)]
diff --git a/zellij-utils/assets/prost/api.plugin_command.rs b/zellij-utils/assets/prost/api.plugin_command.rs
index da13196c0..b86f95491 100644
--- a/zellij-utils/assets/prost/api.plugin_command.rs
+++ b/zellij-utils/assets/prost/api.plugin_command.rs
@@ -5,7 +5,7 @@ pub struct PluginCommand {
     pub name: i32,
     #[prost(
         oneof = "plugin_command::Payload",
-        tags = "2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39"
+        tags = "2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42"
     )]
     pub payload: ::core::option::Option<plugin_command::Payload>,
 }
@@ -90,6 +90,12 @@ pub mod plugin_command {
         RequestPluginPermissionPayload(super::RequestPluginPermissionPayload),
         #[prost(message, tag = "39")]
         SwitchSessionPayload(super::SwitchSessionPayload),
+        #[prost(message, tag = "40")]
+        OpenFileInPlacePayload(super::OpenFilePayload),
+        #[prost(message, tag = "41")]
+        OpenTerminalInPlacePayload(super::OpenFilePayload),
+        #[prost(message, tag = "42")]
+        OpenCommandPaneInPlacePayload(super::OpenCommandPanePayload),
     }
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
@@ -254,6 +260,9 @@ pub enum CommandName {
     ReportCrash = 65,
     RequestPluginPermissions = 66,
     SwitchSession = 67,
+    OpenTerminalInPlace = 68,
+    OpenCommandInPlace = 69,
+    OpenFileInPlace = 70,
 }
 impl CommandName {
     /// String value of the enum field names used in the ProtoBuf definition.
@@ -330,6 +339,9 @@ impl CommandName {
             CommandName::ReportCrash => "ReportCrash",
             CommandName::RequestPluginPermissions => "RequestPluginPermissions",
             CommandName::SwitchSession => "SwitchSession",
+            CommandName::OpenTerminalInPlace => "OpenTerminalInPlace",
+            CommandName::OpenCommandInPlace => "OpenCommandInPlace",
+            CommandName::OpenFileInPlace => "OpenFileInPlace",
         }
     }
     /// Creates an enum from field names used in the ProtoBuf definition.
@@ -403,6 +415,9 @@ impl CommandName {
             "ReportCrash" => Some(Self::ReportCrash),
             "RequestPluginPermissions" => Some(Self::RequestPluginPermissions),
             "SwitchSession" => Some(Self::SwitchSession),
+            "OpenTerminalInPlace" => Some(Self::OpenTerminalInPlace),
+            "OpenCommandInPlace" => Some(Self::OpenCommandInPlace),
+            "OpenFileInPlace" => Some(Self::OpenFileInPlace),
             _ => None,
         }
     }
diff --git a/zellij-utils/src/cli.rs b/zellij-utils/src/cli.rs
index 323834b37..d09625450 100644
--- a/zellij-utils/src/cli.rs
+++ b/zellij-utils/src/cli.rs
@@ -158,6 +158,18 @@ pub enum Sessions {
         #[clap(short, long, value_parser, default_value("false"), takes_value(false))]
         floating: bool,
 
+        /// Open the new pane in place of the current pane, temporarily suspending it
+        #[clap(
+            short,
+            long,
+            value_parser,
+            default_value("false"),
+            takes_value(false),
+            conflicts_with("floating"),
+            conflicts_with("direction")
+        )]
+        in_place: bool,
+
         /// Name of the new pane
         #[clap(short, long, value_parser)]
         name: Option<String>,
@@ -183,6 +195,18 @@ pub enum Sessions {
         #[clap(short, long, value_parser, conflicts_with("floating"))]
         direction: Option<Direction>,
 
+        /// Open the new pane in place of the current pane, temporarily suspending it
+        #[clap(
+            short,
+            long,
+            value_parser,
+            default_value("false"),
+            takes_value(false),
+            conflicts_with("floating"),
+            conflicts_with("direction")
+        )]
+        in_place: bool,
+
         /// Open the new pane in floating mode
         #[clap(short, long, value_parser, default_value("false"), takes_value(false))]
         floating: bool,
@@ -292,6 +316,18 @@ pub enum CliAction {
         #[clap(short, long, value_parser, default_value("false"), takes_value(false))]
         floating: bool,
 
+        /// Open the new pane in place of the current pane, temporarily suspending it
+        #[clap(
+            short,
+            long,
+            value_parser,
+            default_value("false"),
+            takes_value(false),
+            conflicts_with("floating"),
+            conflicts_with("direction")
+        )]
+        in_place: bool,
+
         /// Name of the new pane
         #[clap(short, long, value_parser)]
         name: Option<String>,
@@ -335,6 +371,18 @@ pub enum CliAction {
         #[clap(short, long, value_parser, default_value("false"), takes_value(false))]
         floating: bool,
 
+        /// Open the new pane in place of the current pane, temporarily suspending it
+        #[clap(
+            short,
+            long,
+            value_parser,
+            default_value("false"),
+            takes_value(false),
+            conflicts_with("floating"),
+            conflicts_with("direction")
+        )]
+        in_place: bool,
+
         /// Change the working directory of the editor
         #[clap(long, value_parser)]
         cwd: Option<PathBuf>,
@@ -409,6 +457,8 @@ pub enum CliAction {
         #[clap(short, long, value_parser)]
         floating: bool,
         #[clap(short, long, value_parser)]
+        in_place: bool,
+        #[clap(short, long, value_parser)]
         move_to_focused_tab: bool,
         url: Url,
         #[clap(short, long, value_parser)]
diff --git a/zellij-utils/src/data.rs b/zellij-utils/src/data.rs
index fc09538cb..3702dace4 100644
--- a/zellij-utils/src/data.rs
+++ b/zellij-utils/src/data.rs
@@ -1061,4 +1061,7 @@ pub enum PluginCommand {
     ReportPanic(String),             // stringified panic
     RequestPluginPermissions(Vec<PermissionType>),
     SwitchSession(ConnectToSession),
+    OpenTerminalInPlace(FileToOpen), // only used for the path as cwd
+    OpenFileInPlace(FileToOpen),
+    OpenCommandPaneInPlace(CommandToRun),
 }
diff --git a/zellij-utils/src/errors.rs b/zellij-utils/src/errors.rs
index 677cbc420..a06980400 100644
--- a/zellij-utils/src/errors.rs
+++ b/zellij-utils/src/errors.rs
@@ -343,6 +343,8 @@ pub enum ScreenContext {
     BreakPaneRight,
     BreakPaneLeft,
     UpdateSessionInfos,
+    ReplacePane,
+    NewInPlacePluginPane,
 }
 
 /// Stack call representations corresponding to the different types of [`PtyInstruction`]s.
@@ -358,6 +360,7 @@ pub enum PtyContext {
     ClosePane,
     CloseTab,
     ReRunCommandInPane,
+    SpawnInPlaceTerminal,
     Exit,
 }
 
diff --git a/zellij-utils/src/input/actions.rs b/zellij-utils/src/input/actions.rs
index 054273a0a..766764c89 100644
--- a/zellij-utils/src/input/actions.rs
+++ b/zellij-utils/src/input/actions.rs
@@ -161,11 +161,14 @@ pub enum Action {
         Option<PathBuf>,
         Option<Direction>,
         bool,
-    ), // usize is an optional line number, Option<PathBuf> is an optional cwd, bool is floating true/false
+        bool,
+    ), // usize is an optional line number, Option<PathBuf> is an optional cwd, bool is floating true/false, second bool is in_place
     /// Open a new floating pane
     NewFloatingPane(Option<RunCommandAction>, Option<String>), // String is an optional pane name
     /// Open a new tiled (embedded, non-floating) pane
     NewTiledPane(Option<Direction>, Option<RunCommandAction>, Option<String>), // String is an
+    /// Open a new pane in place of the focused one, suppressing it instead
+    NewInPlacePane(Option<RunCommandAction>, Option<String>), // String is an
     // optional pane
     // name
     /// Embed focused pane in tab if floating or float focused pane if embedded
@@ -204,7 +207,8 @@ pub enum Action {
     LeftClick(Position),
     RightClick(Position),
     MiddleClick(Position),
-    LaunchOrFocusPlugin(RunPlugin, bool, bool), // bools => should float, move_to_focused_tab
+    LaunchOrFocusPlugin(RunPlugin, bool, bool, bool), // bools => should float,
+    // move_to_focused_tab, should_open_in_place
     LeftMouseRelease(Position),
     RightMouseRelease(Position),
     MiddleMouseRelease(Position),
@@ -232,6 +236,7 @@ pub enum Action {
     /// Open a new tiled (embedded, non-floating) plugin pane
     NewTiledPluginPane(RunPlugin, Option<String>), // String is an optional name
     NewFloatingPluginPane(RunPlugin, Option<String>), // String is an optional name
+    NewInPlacePluginPane(RunPlugin, Option<String>),  // String is an optional name
     StartOrReloadPlugin(RunPlugin),
     CloseTerminalPane(u32),
     ClosePluginPane(u32),
@@ -293,6 +298,7 @@ impl Action {
                 plugin,
                 cwd,
                 floating,
+                in_place,
                 name,
                 close_on_exit,
                 start_suspended,
@@ -313,6 +319,8 @@ impl Action {
                     };
                     if floating {
                         Ok(vec![Action::NewFloatingPluginPane(plugin, name)])
+                    } else if in_place {
+                        Ok(vec![Action::NewInPlacePluginPane(plugin, name)])
                     } else {
                         // it is intentional that a new tiled plugin pane cannot include a
                         // direction
@@ -342,6 +350,8 @@ impl Action {
                             Some(run_command_action),
                             name,
                         )])
+                    } else if in_place {
+                        Ok(vec![Action::NewInPlacePane(Some(run_command_action), name)])
                     } else {
                         Ok(vec![Action::NewTiledPane(
                             direction,
@@ -352,6 +362,8 @@ impl Action {
                 } else {
                     if floating {
                         Ok(vec![Action::NewFloatingPane(None, name)])
+                    } else if in_place {
+                        Ok(vec![Action::NewInPlacePane(None, name)])
                     } else {
                         Ok(vec![Action::NewTiledPane(direction, None, name)])
                     }
@@ -362,6 +374,7 @@ impl Action {
                 file,
                 line_number,
                 floating,
+                in_place,
                 cwd,
             } => {
                 let mut file = file;
@@ -380,6 +393,7 @@ impl Action {
                     cwd,
                     direction,
                     floating,
+                    in_place,
                 )])
             },
             CliAction::SwitchMode { input_mode } => {
@@ -501,6 +515,7 @@ impl Action {
             CliAction::LaunchOrFocusPlugin {
                 url,
                 floating,
+                in_place,
                 move_to_focused_tab,
                 configuration,
             } => {
@@ -516,6 +531,7 @@ impl Action {
                     run_plugin,
                     floating,
                     move_to_focused_tab,
+                    in_place,
                 )])
             },
         }
diff --git a/zellij-utils/src/ipc.rs b/zellij-utils/src/ipc.rs
index 0f3415209..a60ecc615 100644
--- a/zellij-utils/src/ipc.rs
+++ b/zellij-utils/src/ipc.rs
@@ -84,7 +84,7 @@ pub enum ClientToServerMsg {
         Option<usize>,       // tab position to focus
         Option<(u32, bool)>, // (pane_id, is_plugin) => pane id to focus
     ),
-    Action(Action, Option<ClientId>),
+    Action(Action, Option<u32>, Option<ClientId>), // u32 is the terminal id
     ClientExited,
     KillSession,
     ConnStatus,
diff --git a/zellij-utils/src/kdl/mod.rs b/zellij-utils/src/kdl/mod.rs
index a7573af55..db72b80d2 100644
--- a/zellij-utils/src/kdl/mod.rs
+++ b/zellij-utils/src/kdl/mod.rs
@@ -886,6 +886,9 @@ impl TryFrom<(&KdlNode, &Options)> for Action {
                 let floating = command_metadata
                     .and_then(|c_m| kdl_child_bool_value_for_entry(c_m, "floating"))
                     .unwrap_or(false);
+                let in_place = command_metadata
+                    .and_then(|c_m| kdl_child_bool_value_for_entry(c_m, "in_place"))
+                    .unwrap_or(false);
                 let run_command_action = RunCommandAction {
                     command: PathBuf::from(command),
                     args,
@@ -896,6 +899,8 @@ impl TryFrom<(&KdlNode, &Options)> for Action {
                 };
                 if floating {
                     Ok(Action::NewFloatingPane(Some(run_command_action), name))
+                } else if in_place {
+                    Ok(Action::NewInPlacePane(Some(run_command_action), name))
                 } else {
                     Ok(Action::NewTiledPane(
                         direction,
@@ -923,6 +928,9 @@ impl TryFrom<(&KdlNode, &Options)> for Action {
                 let move_to_focused_tab = command_metadata
                     .and_then(|c_m| kdl_child_bool_value_for_entry(c_m, "move_to_focused_tab"))
                     .unwrap_or(false);
+                let should_open_in_place = command_metadata
+                    .and_then(|c_m| kdl_child_bool_value_for_entry(c_m, "in_place"))
+                    .unwrap_or(false);
                 let current_dir = std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."));
                 let location = RunPluginLocation::parse(&plugin_path, Some(current_dir))?;
                 let configuration = KdlLayoutParser::parse_plugin_user_configuration(&kdl_action)?;
@@ -935,6 +943,7 @@ impl TryFrom<(&KdlNode, &Options)> for Action {
                     run_plugin,
                     should_float,
                     move_to_focused_tab,
+                    should_open_in_place,
                 ))
             },
             "PreviousSwapLayout" => Ok(Action::PreviousSwapLayout),
diff --git a/zellij-utils/src/plugin_api/action.proto b/zellij-utils/src/plugin_api/action.proto
index 7e40bde24..1545b9bf4 100644
--- a/zellij-utils/src/plugin_api/action.proto
+++ b/zellij-utils/src/plugin_api/action.proto
@@ -85,6 +85,7 @@ message LaunchOrFocusPluginPayload {
   bool should_float = 2;
   optional PluginConfiguration plugin_configuration = 3;
   bool move_to_focused_tab = 4;
+  bool should_open_in_place = 5;
 }
 
 message GoToTabNamePayload {
diff --git a/zellij-utils/src/plugin_api/action.rs b/zellij-utils/src/plugin_api/action.rs
index 0d70af692..bba6e821c 100644
--- a/zellij-utils/src/plugin_api/action.rs
+++ b/zellij-utils/src/plugin_api/action.rs
@@ -232,12 +232,14 @@ impl TryFrom<ProtobufAction> for Action {
                         .and_then(|d| ProtobufResizeDirection::from_i32(d))
                         .and_then(|d| d.try_into().ok());
                     let should_float = payload.should_float;
+                    let should_be_in_place = false;
                     Ok(Action::EditFile(
                         file_to_edit,
                         line_number,
                         cwd,
                         direction,
                         should_float,
+                        should_be_in_place,
                     ))
                 },
                 _ => Err("Wrong payload for Action::NewPane"),
@@ -400,10 +402,12 @@ impl TryFrom<ProtobufAction> for Action {
                         };
                         let should_float = payload.should_float;
                         let move_to_focused_tab = payload.move_to_focused_tab;
+                        let should_open_in_place = payload.should_open_in_place;
                         Ok(Action::LaunchOrFocusPlugin(
                             run_plugin,
                             should_float,
                             move_to_focused_tab,
+                            should_open_in_place,
                         ))
                     },
                     _ => Err("Wrong payload for Action::LaunchOrFocusPlugin"),
@@ -814,7 +818,14 @@ impl TryFrom<Action> for ProtobufAction {
                     })),
                 })
             },
-            Action::EditFile(path_to_file, line_number, cwd, direction, should_float) => {
+            Action::EditFile(
+                path_to_file,
+                line_number,
+                cwd,
+                direction,
+                should_float,
+                _should_be_in_place,
+            ) => {
                 let file_to_edit = path_to_file.display().to_string();
                 let cwd = cwd.map(|cwd| cwd.display().to_string());
                 let direction: Option<i32> = direction
@@ -959,7 +970,12 @@ impl TryFrom<Action> for ProtobufAction {
                     optional_payload: Some(OptionalPayload::MiddleClickPayload(position)),
                 })
             },
-            Action::LaunchOrFocusPlugin(run_plugin, should_float, move_to_focused_tab) => {
+            Action::LaunchOrFocusPlugin(
+                run_plugin,
+                should_float,
+                move_to_focused_tab,
+                should_open_in_place,
+            ) => {
                 let url: Url = Url::from(&run_plugin.location);
                 Ok(ProtobufAction {
                     name: ProtobufActionName::LaunchOrFocusPlugin as i32,
@@ -968,6 +984,7 @@ impl TryFrom<Action> for ProtobufAction {
                             plugin_url: url.into(),
                             should_float,
                             move_to_focused_tab,
+                            should_open_in_place,
                             plugin_configuration: Some(run_plugin.configuration.try_into()?),
                         },
                     )),
@@ -1149,6 +1166,8 @@ impl TryFrom<Action> for ProtobufAction {
             }),
             Action::NoOp
             | Action::Confirm
+            | Action::NewInPlacePane(..)
+            | Action::NewInPlacePluginPane(..)
             | Action::Deny
             | Action::Copy
             | Action::SkipConfirm(..) => Err("Unsupported action"),
diff --git a/zellij-utils/src/plugin_api/plugin_command.proto b/zellij-utils/src/plugin_api/plugin_command.proto
index fed8ec54d..17b153810 100644
--- a/zellij-utils/src/plugin_api/plugin_command.proto
+++ b/zellij-utils/src/plugin_api/plugin_command.proto
@@ -79,6 +79,9 @@ enum CommandName {
   ReportCrash = 65;
   RequestPluginPermissions = 66;
   SwitchSession = 67;
+  OpenTerminalInPlace = 68;
+  OpenCommandInPlace = 69;
+  OpenFileInPlace = 70;
 }
 
 message PluginCommand {
@@ -122,6 +125,9 @@ message PluginCommand {
     string report_crash_payload = 37;
     RequestPluginPermissionPayload request_plugin_permission_payload = 38;
     SwitchSessionPayload switch_session_payload = 39;
+    OpenFilePayload open_file_in_place_payload = 40;
+    OpenFilePayload open_terminal_in_place_payload = 41;
+    OpenCommandPanePayload open_command_pane_in_place_payload = 42;
   }
 }
 
diff --git a/zellij-utils/src/plugin_api/plugin_command.rs b/zellij-utils/src/plugin_api/plugin_command.rs
index 25773ba3a..3d34f10fc 100644
--- a/zellij-utils/src/plugin_api/plugin_command.rs
+++ b/zellij-utils/src/plugin_api/plugin_command.rs
@@ -82,7 +82,7 @@ impl TryFrom<ProtobufPluginCommand> for PluginCommand {
                         None => Err("Malformed open file payload"),
                     }
                 },
-                _ => Err("Mismatched payload for OpenFile"),
+                _ => Err("Mismatched payload for OpenFileFloating"),
             },
             Some(CommandName::OpenTerminal) => match protobuf_plugin_command.payload {
                 Some(Payload::OpenTerminalPayload(file_to_open_payload)) => {
@@ -520,6 +520,39 @@ impl TryFrom<ProtobufPluginCommand> for PluginCommand {
                 },
                 _ => Err("Mismatched payload for SwitchSession"),
             },
+            Some(CommandName::OpenTerminalInPlace) => match protobuf_plugin_command.payload {
+                Some(Payload::OpenTerminalInPlacePayload(file_to_open_payload)) => {
+                    match file_to_open_payload.file_to_open {
+                        Some(file_to_open) => {
+                            Ok(PluginCommand::OpenTerminalInPlace(file_to_open.try_into()?))
+                        },
+                        None => Err("Malformed open terminal in-place payload"),
+                    }
+                },
+                _ => Err("Mismatched payload for OpenTerminalInPlace"),
+            },
+            Some(CommandName::OpenFileInPlace) => match protobuf_plugin_command.payload {
+                Some(Payload::OpenFileInPlacePayload(file_to_open_payload)) => {
+                    match file_to_open_payload.file_to_open {
+                        Some(file_to_open) => {
+                            Ok(PluginCommand::OpenFileInPlace(file_to_open.try_into()?))
+                        },
+                        None => Err("Malformed open file in place payload"),
+                    }
+                },
+                _ => Err("Mismatched payload for OpenFileInPlace"),
+            },
+            Some(CommandName::OpenCommandInPlace) => match protobuf_plugin_command.payload {
+                Some(Payload::OpenCommandPaneInPlacePayload(command_to_run_payload)) => {
+