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import chokidar from 'chokidar';
import EventEmitter from 'events';
import * as path from 'path';
import {fileURLToPath} from 'url';
import contentFunction from '../../content-function.js';
import {color, logWarn} from '../../util/cli.js';
import {annotateFunction} from '../../util/sugar.js';
export function watchContentDependencies({
logging = true,
} = {}) {
const events = new EventEmitter();
const contentDependencies = {};
let emittedReady = false;
let initialScanComplete = false;
let allDependenciesFulfilled = false;
Object.assign(events, {
contentDependencies,
close,
});
// Watch adjacent files
const metaPath = fileURLToPath(import.meta.url);
const metaDirname = path.dirname(metaPath);
const watcher = chokidar.watch(metaDirname);
watcher.on('all', (event, filePath) => {
if (!['add', 'change'].includes(event)) return;
if (filePath === metaPath) return;
handlePathUpdated(filePath);
});
watcher.on('unlink', (filePath) => {
if (filePath === metaPath) {
console.error(`Yeowzers content dependencies just got nuked.`);
return;
}
handlePathRemoved(filePath);
});
watcher.on('ready', () => {
initialScanComplete = true;
checkReadyConditions();
});
return events;
async function close() {
return watcher.close();
}
function checkReadyConditions() {
if (emittedReady) {
return;
}
if (!initialScanComplete) {
return;
}
checkAllDependenciesFulfilled();
if (!allDependenciesFulfilled) {
return;
}
events.emit('ready');
emittedReady = true;
}
function checkAllDependenciesFulfilled() {
allDependenciesFulfilled = !Object.values(contentDependencies).includes(null);
}
function getFunctionName(filePath) {
const shortPath = path.basename(filePath);
const functionName = shortPath.slice(0, -path.extname(shortPath).length);
return functionName;
}
async function handlePathRemoved(filePath) {
const functionName = getFunctionName(filePath);
delete contentDependencies[functionName];
}
async function handlePathUpdated(filePath) {
const functionName = getFunctionName(filePath);
let error = null;
main: {
let spec;
try {
spec = (await import(`${filePath}?${Date.now()}`)).default;
} catch (caughtError) {
error = caughtError;
error.message = `Error importing: ${error.message}`;
break main;
}
try {
if (typeof spec.data === 'function') {
annotateFunction(spec.data, {name: functionName, description: 'data'});
}
if (typeof spec.generate === 'function') {
annotateFunction(spec.generate, {name: functionName});
}
} catch (caughtError) {
error = caughtError;
error.message = `Error annotating functions: ${error.message}`;
break main;
}
let fn;
try {
fn = contentFunction(spec);
} catch (caughtError) {
error = caughtError;
error.message = `Error loading spec: ${error.message}`;
break main;
}
contentDependencies[functionName] = fn;
events.emit('update', functionName);
checkReadyConditions();
}
if (!error) {
return true;
}
if (!(functionName in contentDependencies)) {
contentDependencies[functionName] = null;
}
events.emit('error', functionName, error);
if (logging) {
if (contentDependencies[functionName]) {
logWarn`Failed to import ${functionName} - using existing version`;
} else {
logWarn`Failed to import ${functionName} - no prior version loaded`;
}
if (typeof error === 'string') {
console.error(color.yellow(error));
} else {
console.error(error);
}
}
return false;
}
}
export function quickLoadContentDependencies() {
return new Promise((resolve, reject) => {
const watcher = watchContentDependencies();
watcher.on('error', (name, error) => {
watcher.close().then(() => {
error.message = `Error loading dependency ${name}: ${error}`;
reject(error);
});
});
watcher.on('ready', () => {
watcher.close().then(() => {
resolve(watcher.contentDependencies);
});
});
});
}
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