[#89] sketch of userland implementation of inline scripts

examples/tasks/inline-script/bash.js

@@ -0,0 +1,55 @@
+'use strict'
+
+const { task } = require('../../..')
+
+const fs = require('fs')
+const path = require('path')
+const { spawn } = require('child_process')
+
+const script = ({ dir, program }) => (strings, ...values) => {
+  let content = ''
+  strings.forEach((str, i) => {
+    content += str + (values[i] || '')
+  })
+
+  const scriptLocation = path.resolve(dir, 'script.' + (() => {
+    switch (program) {
+      case 'bash': return 'sh'
+      case 'python': return 'py'
+    }
+  })())
+
+  fs.writeFileSync(scriptLocation, `
+#!/usr/bin/env ${program}
+${content.replace(/\n\ {2}/g, '\n')}
+  `.trim())
+
+  fs.chmodSync(scriptLocation, '755')
+
+  const cp = spawn(scriptLocation)
+
+  cp.on('error', (err) => console.log(`${scriptLocation} error:`, err))
+  cp.on('close', () => console.log(`${scriptLocation} closed`))
+  cp.on('exit', () => console.log(`${scriptLocation} exited`))
+  cp.on('disconnect', () => console.log(`${scriptLocation} disconnected`))
+
+  cp.stdout.on('data', (chunk) => console.log(`${scriptLocation} stdout: ${chunk}`))
+  cp.stderr.on('data', (chunk) => console.log(`${scriptLocation} stderr: ${chunk}`))
+
+  return cp
+}
+
+const myTask = task({
+  name: 'my task',
+  input: '*.lowercase',
+  output: '*.uppercase'
+}, ({ input, dir }) => script({ dir, program: 'bash' })`
+  input="${input}"
+  output="${input.replace(/\.lowercase$/, '.uppercase')}"
+
+  cat $input | awk '{print toupper($0)}' > $output
+`)
+
+myTask()
+  .then(() => console.log('done'))
+  .catch(console.error)