angular-cn/tools/tsc-watch/tsc_watch.ts

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TypeScript
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import {spawn} from 'child_process';
import {resolve} from 'url';
enum State {
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idle,
waiting,
error
}
export const TSC = 'node_modules/typescript/bin/tsc';
export type Command = (stdIn: any, stdErr: any) => Promise<number>;
export class TscWatch {
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private tsconfig: string;
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private start: string|RegExp;
private error: string|RegExp;
private complete: string|RegExp;
private onStartCmds: Array<string[]|Command>;
private onChangeCmds: Array<string[]|Command>;
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private state: State;
private triggered: Promise<number> = null;
private runOnce: boolean = false;
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constructor({tsconfig, start, error, complete, onStartCmds = null, onChangeCmds = null}: {
tsconfig: string,
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error: string|RegExp,
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start: string,
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complete: string, onStartCmds?: Array<string[]|Command>, onChangeCmds?: Array<string[]|Command>
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}) {
console.log('Watching:', tsconfig, 'in', process.cwd());
this.tsconfig = tsconfig;
this.start = start;
this.error = error;
this.complete = complete;
this.onStartCmds = onStartCmds || [];
this.onChangeCmds = onChangeCmds || [];
}
watch() {
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var args = [TSC, '--emitDecoratorMetadata', '--project', this.tsconfig];
if (!this.runOnce) args.push('--watch');
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var tsc =
this.runCmd(args, {}, (d) => this.consumeLine(d, false), (d) => this.consumeLine(d, true));
if (this.runOnce) {
tsc.then(() => this.triggerCmds(), code => process.exit(code));
}
this.state = State.waiting;
this.onStartCmds.forEach((cmd) => this.runCmd(cmd, null, () => null, () => null));
}
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private runCmd(
argsOrCmd: string[]|Command, env?: {[k: string]: string}, stdOut = pipeStdOut,
stdErr = pipeStdErr): Promise<number> {
if (typeof argsOrCmd == 'function') {
return (argsOrCmd as Command)(stdErr, stdOut);
} else if (argsOrCmd instanceof Array) {
var args = argsOrCmd as Array<string>;
return <any>new Promise((resolve, reject) => {
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var [cmd, ...options] = args;
console.log('=====>', cmd, options.join(' '));
var childProcess = spawn(cmd, options, {stdio: 'pipe'});
childProcess.stdout.on('data', stdOut);
childProcess.stderr.on('data', stdErr);
var onExit = () => childProcess.kill();
childProcess.on('close', (code: number) => {
process.removeListener('exit', onExit);
console.log('EXIT:', code, '<=====', args.join(' '));
code ? reject(code) : resolve(code);
});
process.on('exit', onExit);
})
.catch(reportError);
} else {
throw new Error('Expecting function or an array of strings...');
}
}
run() {
this.runOnce = true;
this.watch();
}
runCmdsOnly() {
this.runOnce = true;
this.triggerCmds();
}
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consumeLine(buffer: Buffer, isStdError: boolean) {
var line = '' + buffer;
if (contains(line, this.start)) {
console.log('==============================================================================');
stdOut(buffer, isStdError);
this.state = State.waiting;
} else if (contains(line, this.error)) {
stdOut(buffer, isStdError);
this.state = State.error;
} else if (contains(line, this.complete)) {
stdOut(buffer, isStdError);
console.log('------------------------------------------------------------------------------');
if (this.state == State.error) {
console.log('Errors found.... (response not triggered)');
if (this.runOnce) process.exit(1);
this.state = State.idle;
} else {
if (this.triggered) {
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this.triggered.then(
() => this.triggerCmds(),
(e) => {console.log('Error while running commands....', e)});
} else {
this.triggerCmds();
}
}
} else {
stdOut(buffer, isStdError);
}
}
triggerCmds() {
var cmdPromise: Promise<number> = Promise.resolve(0);
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this.onChangeCmds.forEach((cmd: string[] | Command) => {cmdPromise = cmdPromise.then(() => {
return this.runCmd(<string[]>cmd);
})});
cmdPromise.then(() => this.triggered = null, (code) => {
if (this.runOnce) {
if (typeof code != 'number') {
console.error('Error occurred while executing commands', code);
process.exit(1);
}
process.exit(code);
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} else {
this.triggered = null;
}
});
this.triggered = cmdPromise;
}
}
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function stdOut(data: Buffer, isStdError: boolean) {
if (isStdError) {
process.stderr.write(data);
} else {
process.stdout.write(data);
}
}
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function contains(line: string, text: string | RegExp): boolean {
if (typeof text == 'string') {
return line.indexOf(text as string) != -1;
} else if (text instanceof RegExp) {
return (text as RegExp).test(line);
} else {
throw new Error('Unknown: ' + text);
}
}
export function reportError(e: any) {
if (e.message && e.stack) {
console.error(e.message);
console.error(e.stack);
} else {
console.error(e);
}
// process.exit(1);
return Promise.reject(e);
}
function pipeStdOut(d: any) {
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process.stdout.write(d);
}
function pipeStdErr(d: any) {
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process.stderr.write(d);
}