function definitionLocation_gogetdoc()

in src/language/legacy/goDeclaration.ts [220:292]

• 72 lines of code
• 18 McCabe index (conditional complexity)

function definitionLocation_gogetdoc(
	input: GoDefinitionInput,
	token: vscode.CancellationToken,
	useTags: boolean
): Promise<GoDefinitionInformation | null> {
	const gogetdoc = getBinPath('gogetdoc');
	if (!path.isAbsolute(gogetdoc)) {
		return Promise.reject(missingToolMsg + 'gogetdoc');
	}
	const offset = byteOffsetAt(input.document, input.position);
	const env = toolExecutionEnvironment();
	let p: cp.ChildProcess | null | undefined;
	if (token) {
		token.onCancellationRequested(() => p && killProcessTree(p));
	}

	return new Promise((resolve, reject) => {
		const gogetdocFlagsWithoutTags = [
			'-u',
			'-json',
			'-modified',
			'-pos',
			input.document.fileName + ':#' + offset.toString()
		];
		const buildTags = getGoConfig(input.document.uri)['buildTags'];
		const gogetdocFlags =
			buildTags && useTags ? [...gogetdocFlagsWithoutTags, '-tags', buildTags] : gogetdocFlagsWithoutTags;
		p = cp.execFile(gogetdoc, gogetdocFlags, { env, cwd: input.cwd }, (err, stdout, stderr) => {
			try {
				if (err && (<any>err).code === 'ENOENT') {
					return reject(missingToolMsg + 'gogetdoc');
				}
				if (stderr && stderr.startsWith('flag provided but not defined: -tags')) {
					p = null;
					return definitionLocation_gogetdoc(input, token, false).then(resolve, reject);
				}
				if (err) {
					if (input.isMod && !input.includeDocs && stdout.startsWith("gogetdoc: couldn't get package for")) {
						promptToUpdateToolForModules(
							'gogetdoc',
							'To get the Go to Definition feature when using Go modules, please update your version of the "gogetdoc" tool.'
						);
						return resolve(null);
					}
					return reject(err.message || stderr);
				}
				const goGetDocOutput = <GoGetDocOuput>JSON.parse(stdout.toString());
				const match = /(.*):(\d+):(\d+)/.exec(goGetDocOutput.pos);
				const definitionInfo: GoDefinitionInformation = {
					file: undefined,
					line: 0,
					column: 0,
					toolUsed: 'gogetdoc',
					declarationlines: goGetDocOutput.decl.split('\n'),
					doc: goGetDocOutput.doc,
					name: goGetDocOutput.name
				};
				if (!match) {
					return resolve(definitionInfo);
				}
				definitionInfo.file = match[1];
				definitionInfo.line = +match[2] - 1;
				definitionInfo.column = +match[3] - 1;
				return resolve(definitionInfo);
			} catch (e) {
				reject(e);
			}
		});
		if (p.pid) {
			p.stdin?.end(getFileArchive(input.document));
		}
	});
}