Click file paths to open in editor, allow plugins to change styles and hover of viewport (#4802)

* initial implementation

* implement hover

* add styles and foreground/background emphases, fix upsert hover collisions

* initial implementation of link plugin

* suppress highlighting + clicks on unfocused and mouse mode panes

* also make italic

* fix env var and ~ expansions

* fix regex issues and add defensive validations

* fix tests and add plugin assets

* add tests

* refactor all the things

* add pr

1 files changed, 53 insertions, 0 deletions

diff --git a/zellij-utils/src/plugin_api/plugin_command.proto b/zellij-utils/src/plugin_api/plugin_command.proto
index 53e9d729..c4fa949f 100644
--- a/zellij-utils/src/plugin_api/plugin_command.proto
+++ b/zellij-utils/src/plugin_api/plugin_command.proto
@@ -199,6 +199,8 @@ enum CommandName {
   HideFloatingPanes = 204;
   ShowFloatingPanes = 205;
   SetPaneColor = 206;
+  SetPaneRegexHighlights = 207;
+  ClearPaneHighlights = 208;
 }
 
 message PluginCommand {
@@ -347,6 +349,8 @@ message PluginCommand {
     HideFloatingPanesPayload hide_floating_panes_payload = 155;
     ShowFloatingPanesPayload show_floating_panes_payload = 156;
     SetPaneColorPayload set_pane_color_payload = 157;
+    SetPaneRegexHighlightsPayload set_pane_regex_highlights_payload = 158;
+    ClearPaneHighlightsPayload clear_pane_highlights_payload = 159;
   }
 }
 
@@ -1220,3 +1224,52 @@ message SetPaneColorPayload {
   optional string fg = 2;
   optional string bg = 3;
 }
+
+message HighlightStyle {
+  oneof style {
+    bool emphasis_0 = 1;
+    bool emphasis_1 = 2;
+    bool emphasis_2 = 3;
+    bool emphasis_3 = 4;
+    CustomRgbHighlight custom_rgb = 5;
+    CustomIndexHighlight custom_index = 6;
+    bool background_emphasis_0 = 7;
+    bool background_emphasis_1 = 8;
+    bool background_emphasis_2 = 9;
+    bool background_emphasis_3 = 10;
+    bool none = 11;
+  }
+}
+
+message CustomRgbHighlight {
+  optional uint32 fg_r = 1;
+  optional uint32 fg_g = 2;
+  optional uint32 fg_b = 3;
+  optional uint32 bg_r = 4;
+  optional uint32 bg_g = 5;
+  optional uint32 bg_b = 6;
+}
+
+message CustomIndexHighlight {
+  optional uint32 fg = 1;
+  optional uint32 bg = 2;
+}
+
+message RegexHighlight {
+  string pattern = 1;
+  HighlightStyle style = 2;
+  repeated ContextItem context = 3;
+  bool on_hover = 4;
+  bool bold = 5;
+  bool italic = 6;
+  bool underline = 7;
+}
+
+message SetPaneRegexHighlightsPayload {
+  PaneId pane_id = 1;
+  repeated RegexHighlight highlights = 2;
+}
+
+message ClearPaneHighlightsPayload {
+  PaneId pane_id = 1;
+}