Give plugins the ability to read pane contents (#4465)

* initial implementation

* add Selection and better types

* event to plugins

* only send viewport diff

* simplify data structure sent over the wire

* cleanups

* rustfmt

* remove dead code and fix tests

* commit tests

* get pane scrollback plugin command without implementation

* add lines above and lines below to pane contents

* implement get scrollback plugin command

* selection => selected_text

* add convenience method to get the selected text

* move Selection back to zellij-server

* rustfmt

* bring back client id to get contents command

* rustfmt

* add pr

1 files changed, 7 insertions, 0 deletions

diff --git a/zellij-utils/src/plugin_api/plugin_command.proto b/zellij-utils/src/plugin_api/plugin_command.proto
index 49ab98c6..7ffe2fc1 100644
--- a/zellij-utils/src/plugin_api/plugin_command.proto
+++ b/zellij-utils/src/plugin_api/plugin_command.proto
@@ -159,6 +159,7 @@ enum CommandName {
   InterceptKeyPresses = 143;
   ClearKeyPressesIntercepts = 144;
   ReplacePaneWithExistingPane = 155;
+  GetPaneScrollback = 163;
 }
 
 message PluginCommand {
@@ -266,6 +267,7 @@ message PluginCommand {
     RenameWebLoginTokenPayload rename_web_login_token_payload = 110;
     ReplacePaneWithExistingPanePayload replace_pane_with_existing_pane_payload = 111;
     NewTabPayload new_tab_payload = 112;
+    GetPaneScrollbackPayload get_pane_scrollback_payload = 113;
   }
 }
 
@@ -703,3 +705,8 @@ message RenameWebTokenResponse {
   bool successfully_renamed = 1;
   optional string error = 2;
 }
+
+message GetPaneScrollbackPayload {
+  PaneId pane_id = 1;
+  bool get_full_scrollback = 2;
+}