Beautify generated action code (#53)

Author: tardieu

composer.js

@@ -23,6 +23,7 @@ const os = require('os')
 const path = require('path')
 const util = require('util')
 const uglify = require('uglify-es')
+const { version } = require('./package.json')
 
 class ComposerError extends Error {
     constructor(message, argument) {
@@ -46,7 +47,7 @@ function validate(options) {
  */
 function encode({ name, action }) {
     if (action.exec.kind !== 'composition') return { name, action }
-    const code = `${conductor}(eval,${JSON.stringify(action.exec.composition)})` // invoke conductor on composition
+    const code = `// generated by composer v${version}\n\nconst composition = ${JSON.stringify(action.exec.composition, null, 4)}\n\n// do not edit below this point\n\n${conductor}(eval,composition)` // invoke conductor on composition
     return { name, action: { exec: { kind: 'nodejs:default', code }, annotations: [{ key: 'conductor', value: action.exec.composition }] } }
 }
 
@@ -307,7 +308,7 @@ module.exports = new Composer()
 
 // conductor action
 
-const conductor = `const main=(${uglify.minify(`${init}`).code})`
+const conductor = `const main=(${uglify.minify(`${init}`, { output: { max_line_len: 127 } }).code})`
 
 function init(__eval__, composition) {
     function chain(front, back) {