tswatch/ts/tswatch.classes.tswatch.ts
2019-05-08 11:16:24 +02:00

80 lines
2.2 KiB
TypeScript

import * as plugins from './tswatch.plugins';
export interface ITsWatchConstructorOptions {
filePathToWatch: string;
commandToExecute: string;
timeout?: number;
}
/**
* handles the management of watching for foes
*/
export class TsWatch {
private smartshellInstance = new plugins.smartshell.Smartshell({
executor: 'bash'
});
private currentExecution: plugins.smartshell.IExecResultStreaming;
private watcher = new plugins.smartchok.Smartchok([], {});
private options: ITsWatchConstructorOptions;
constructor(optionsArg: ITsWatchConstructorOptions) {
this.options = optionsArg;
}
/**
* start the file
*/
public async start() {
this.setupCleanup();
console.log(`Looking at ${this.options.filePathToWatch} for changes`);
this.watcher.add([this.options.filePathToWatch]); // __dirname refers to the directory of this very file
const changeObservable = await this.watcher.getObservableFor('change');
changeObservable.subscribe(() => {
this.updateCurrentExecution();
});
this.updateCurrentExecution();
}
private async updateCurrentExecution() {
if (this.currentExecution) {
process.kill(-this.currentExecution.childProcess.pid);
}
this.currentExecution = await this.smartshellInstance.execStreaming(
this.options.commandToExecute
);
this.currentExecution = null;
}
/**
* this method sets up a clean exit strategy
*/
private async setupCleanup() {
const cleanup = () => {
if (this.currentExecution) {
process.kill(-this.currentExecution.childProcess.pid);
}
};
process.on('exit', () => {
console.log('');
console.log('now exiting!');
cleanup();
process.exit(0);
});
process.on('SIGINT', () => {
console.log('');
console.log('ok! got SIGINT We are exiting! Just cleaning up to exit neatly :)');
cleanup();
process.exit(0);
});
// handle timeout
if (this.options.timeout) {
plugins.smartdelay.delayFor(this.options.timeout).then(() => {
console.log(`timed out afer ${this.options.timeout} milliseconds! exiting!`);
cleanup();
process.exit(0);
});
}
}
}