feat: ctx.monitor

zaaack · Jul 26, 2021 · 7e841bc · 7e841bc
1 parent a0d9d83
commit 7e841bc
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diff --git a/README.md b/README.md
@@ -378,6 +378,11 @@ task('build', async ctx => {
  ctx.exec('tsc'),
  ctx.exec('typedoc'),
  ])
+ // restart process when file changes
+ ctx.monitor('./src', async () => {
+ await ctx.run('build:server')
+ return ctx.exec('node ./dist')
+ })
 })
 
 

diff --git a/src/exec.ts b/src/exec.ts
@@ -137,6 +137,31 @@ export class ShellContext {
  }
  return this
  }
+ /**
+ * restart processes when file changes
+ */
+ monitor(dir: string, run: (ctx: ShellContext) => execa.ExecaChildProcess | Promise<execa.ExecaChildProcess>, {
+ throttle
+ }: {
+ throttle?: number
+ }) {
+ let p: execa.ExecaChildProcess | null = null
+ fs.watchDir(dir, { throttle }, async (event, file) => {
+ while (p && !p.killed) {
+ p && p.kill()
+ await sleep(500)
+ }
+ let ret = run(this)
+ if ('kill' in ret) {
+ p = ret
+ } else {
+ await ret.then(r => {
+ p=r
+ return
+ })
+ }
+ })
+ }
  /**
  * reset env to default
  */