feat: range hover

src/client.ts

@@ -1,9 +1,10 @@
-import { CodeActionKind, Command, Executable, LanguageClient, LanguageClientOptions, ServerOptions, StaticFeature, Uri, workspace } from 'coc.nvim';
+import { CodeActionKind, Command, Executable, LanguageClient, LanguageClientOptions, Position, Range, ServerOptions, StaticFeature, Uri, workspace } from 'coc.nvim';
 import { existsSync } from 'fs';
 import { join } from 'path';
 import { CodeAction, CodeActionParams, CodeActionRequest } from 'vscode-languageserver-protocol';
 import { Env } from './config';
 import { isRustDocument } from './ctx';
+import * as ra from './lsp_ext';
 
 class ExperimentalFeatures implements StaticFeature {
   fillClientCapabilities(capabilities: any): void {
@@ -62,6 +63,21 @@ export function createClient(bin: string, extra: Env): LanguageClient {
     documentSelector: [{ language: 'rust' }],
     initializationOptions,
     middleware: {
+      async provideHover(document, position, token) {
+        let positionOrRange: Range | Position | null = null;
+        const mode = (await workspace.nvim.call('mode')) as string;
+        if (mode === 'v' || mode === 'V') {
+          const doc = workspace.getDocument(document.uri);
+          await workspace.nvim.call('eval', 'feedkeys("\\<esc>", "in")');
+          positionOrRange = await workspace.getSelectedRange(mode, doc);
+        }
+        if (!positionOrRange) positionOrRange = position;
+        const param: ra.HoverParams = {
+          position: positionOrRange || position,
+          textDocument: { uri: document.uri },
+        };
+        return await client.sendRequest(ra.hover, param, token);
+      },
       async resolveCompletionItem(item, token, next) {
         if (item.data && !item.data.position) {
           // TODO: remove this if coc undefined item.data

src/lsp_ext.ts

@@ -19,6 +19,14 @@ export const serverStatus = new lc.NotificationType<ServerStatusParams>('experim
 
 export const reloadWorkspace = new lc.RequestType0<null, void>('rust-analyzer/reloadWorkspace');
 
+export const hover = new lc.RequestType<HoverParams, lc.Hover | null, void>('textDocument/hover');
+
+export interface HoverParams {
+  workDoneToken?: lc.ProgressToken;
+  textDocument: lc.TextDocumentIdentifier;
+  position: lc.Range | lc.Position;
+}
+
 export interface SyntaxTreeParams {
   textDocument: lc.TextDocumentIdentifier;
   range: lc.Range | null;
@@ -55,7 +63,7 @@ export interface MatchingBraceParams {
 }
 export const matchingBrace = new lc.RequestType<MatchingBraceParams, lc.Position[], void>('experimental/matchingBrace');
 
-export const parentModule = new lc.RequestType<lc.TextDocumentPositionParams, lc.Location[] | lc.LocationLink[], void>('experimental/parentModule');
+export const parentModule = new lc.RequestType<lc.TextDocumentPositionParams, lc.LocationLink[], void>('experimental/parentModule');
 
 export interface JoinLinesParams {
   textDocument: lc.TextDocumentIdentifier;