Show inline previews for LSP document colors (#32816)

https://github.com/user-attachments/assets/ad0fa304-e4fb-4598-877d-c02141f35d6f

Closes https://github.com/zed-industries/zed/issues/4678

Also adds the code to support `textDocument/colorPresentation`
counterpart that serves as a resolve mechanism for the document colors.
The resolve itself is not run though, and the editor does not
accommodate color presentations in the editor yet — until a well
described use case is provided.

Use `lsp_document_colors` editor settings to alter the presentation and
turn the feature off.

Release Notes:

- Start showing inline previews for LSP document colors

crates/proto/proto/lsp.proto

@@ -666,6 +666,51 @@ message LanguageServerPromptResponse {
     optional uint64 action_response = 1;
 }
 
+message GetDocumentColor {
+    uint64 project_id = 1;
+    uint64 buffer_id = 2;
+    repeated VectorClockEntry version = 3;
+
+}
+
+message GetDocumentColorResponse {
+    repeated ColorInformation colors = 1;
+    repeated VectorClockEntry version = 2;
+
+}
+
+message ColorInformation {
+    PointUtf16 lsp_range_start = 1;
+    PointUtf16 lsp_range_end = 2;
+    float red = 3;
+    float green = 4;
+    float blue = 5;
+    float alpha = 6;
+}
+
+message GetColorPresentation {
+    uint64 project_id = 1;
+    uint64 buffer_id = 2;
+    ColorInformation color = 3;
+    uint64 server_id = 4;
+}
+
+message GetColorPresentationResponse {
+    repeated ColorPresentation presentations = 1;
+}
+
+message ColorPresentation {
+    string label = 1;
+    optional TextEdit text_edit = 2;
+    repeated TextEdit additional_text_edits = 3;
+}
+
+message TextEdit {
+    string new_text = 1;
+    PointUtf16 lsp_range_start = 2;
+    PointUtf16 lsp_range_end = 3;
+}
+
 message MultiLspQuery {
     uint64 project_id = 1;
     uint64 buffer_id = 2;
@@ -679,6 +724,7 @@ message MultiLspQuery {
         GetSignatureHelp get_signature_help = 7;
         GetCodeLens get_code_lens = 8;
         GetDocumentDiagnostics get_document_diagnostics = 9;
+        GetDocumentColor get_document_color = 10;
     }
 }
 
@@ -705,7 +751,9 @@ message LspResponse {
         GetSignatureHelpResponse get_signature_help_response = 3;
         GetCodeLensResponse get_code_lens_response = 4;
         GetDocumentDiagnosticsResponse get_document_diagnostics_response = 5;
+        GetDocumentColorResponse get_document_color_response = 6;
     }
+    uint64 server_id = 7;
 }
 
 message LanguageServerIdForName {

crates/proto/proto/zed.proto

@@ -391,7 +391,12 @@ message Envelope {
 
         GetDocumentDiagnostics get_document_diagnostics = 350;
         GetDocumentDiagnosticsResponse get_document_diagnostics_response = 351;
-        PullWorkspaceDiagnostics pull_workspace_diagnostics = 352; // current max
+        PullWorkspaceDiagnostics pull_workspace_diagnostics = 352;
+
+        GetDocumentColor get_document_color = 353;
+        GetDocumentColorResponse get_document_color_response = 354;
+        GetColorPresentation get_color_presentation = 355;
+        GetColorPresentationResponse get_color_presentation_response = 356; // current max
 
     }
 

crates/proto/src/proto.rs

@@ -221,6 +221,10 @@ messages!(
     (ResolveCompletionDocumentationResponse, Background),
     (ResolveInlayHint, Background),
     (ResolveInlayHintResponse, Background),
+    (GetDocumentColor, Background),
+    (GetDocumentColorResponse, Background),
+    (GetColorPresentation, Background),
+    (GetColorPresentationResponse, Background),
     (RefreshCodeLens, Background),
     (GetCodeLens, Background),
     (GetCodeLensResponse, Background),
@@ -400,6 +404,8 @@ request_messages!(
         ResolveCompletionDocumentationResponse
     ),
     (ResolveInlayHint, ResolveInlayHintResponse),
+    (GetDocumentColor, GetDocumentColorResponse),
+    (GetColorPresentation, GetColorPresentationResponse),
     (RespondToChannelInvite, Ack),
     (RespondToContactRequest, Ack),
     (SaveBuffer, BufferSaved),
@@ -487,9 +493,11 @@ entity_messages!(
     BufferSaved,
     CloseBuffer,
     Commit,
+    GetColorPresentation,
     CopyProjectEntry,
     CreateBufferForPeer,
     CreateProjectEntry,
+    GetDocumentColor,
     DeleteProjectEntry,
     ExpandProjectEntry,
     ExpandAllForProjectEntry,