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import * as vscode from 'vscode';
import * as lc from 'vscode-languageclient';
import { Ctx } from './ctx';
export function activateInlayHints(ctx: Ctx) {
const hintsUpdater = new HintsUpdater(ctx);
vscode.window.onDidChangeVisibleTextEditors(async _ => {
await hintsUpdater.refresh();
}, ctx.subscriptions);
vscode.workspace.onDidChangeTextDocument(async e => {
if (e.contentChanges.length === 0) return;
if (e.document.languageId !== 'rust') return;
await hintsUpdater.refresh();
}, ctx.subscriptions);
vscode.workspace.onDidChangeConfiguration(_ => {
hintsUpdater.setEnabled(ctx.config.displayInlayHints);
}, ctx.subscriptions);
// XXX: don't await here;
// Who knows what happens if an exception is thrown here...
hintsUpdater.refresh();
}
interface InlayHintsParams {
textDocument: lc.TextDocumentIdentifier;
}
interface InlayHint {
range: vscode.Range;
kind: string;
label: string;
}
const typeHintDecorationType = vscode.window.createTextEditorDecorationType({
after: {
color: new vscode.ThemeColor('rust-analyzer.inlayHint'),
},
});
class HintsUpdater {
private pending: Map<string, vscode.CancellationTokenSource> = new Map();
private ctx: Ctx;
private enabled = true;
constructor(ctx: Ctx) {
this.ctx = ctx;
}
async setEnabled(enabled: boolean) {
if (this.enabled == enabled) return;
this.enabled = enabled;
if (this.enabled) {
await this.refresh();
} else {
this.allEditors.forEach(it => this.setDecorations(it, []));
}
}
async refresh() {
if (!this.enabled) return;
const promises = this.allEditors.map(it => this.refreshEditor(it));
await Promise.all(promises);
}
private async refreshEditor(editor: vscode.TextEditor): Promise<void> {
const newHints = await this.queryHints(editor.document.uri.toString());
if (newHints == null) return;
const newDecorations = newHints.map(hint => ({
range: hint.range,
renderOptions: {
after: {
contentText: `: ${hint.label}`,
},
},
}));
this.setDecorations(editor, newDecorations);
}
private get allEditors(): vscode.TextEditor[] {
return vscode.window.visibleTextEditors.filter(
editor => editor.document.languageId === 'rust',
);
}
private setDecorations(
editor: vscode.TextEditor,
decorations: vscode.DecorationOptions[],
) {
editor.setDecorations(
typeHintDecorationType,
this.enabled ? decorations : [],
);
}
private async queryHints(documentUri: string): Promise<InlayHint[] | null> {
const request: InlayHintsParams = {
textDocument: { uri: documentUri },
};
let tokenSource = new vscode.CancellationTokenSource();
let prev = this.pending.get(documentUri);
if (prev) prev.cancel();
this.pending.set(documentUri, tokenSource);
try {
return await this.ctx.sendRequestWithRetry<InlayHint[] | null>(
'rust-analyzer/inlayHints',
request,
tokenSource.token,
);
} finally {
if (!tokenSource.token.isCancellationRequested) {
this.pending.delete(documentUri);
}
}
}
}
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