Reduce building of PureScript module map

Resolves #59 and resolves #60

7 files changed, 449 insertions, 360 deletions

diff --git a/.gitignore b/.gitignore
index 7d50432..4b26e66 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 **DS_Store*
 node_modules/
-index.js
+lib/
diff --git a/package.json b/package.json
index 5fc5a7f..6c276ce 100644
--- a/package.json
+++ b/package.json
@@ -2,15 +2,15 @@
   "name": "purs-loader",
   "version": "2.0.0-rc.0",
   "description": "A webpack loader for PureScript.",
-  "main": "index.js",
+  "main": "lib/index.js",
   "files": [
     "LICENSE",
     "README.md",
-    "index.js",
-    "src/index.js"
+    "src",
+    "lib"
   ],
   "scripts": {
-    "build": "babel src/index.js -o index.js",
+    "build": "babel src --out-dir lib",
     "prepublish": "npm run build",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
diff --git a/src/PsModuleMap.js b/src/PsModuleMap.js
new file mode 100644
index 0000000..2193f02
--- /dev/null
+++ b/src/PsModuleMap.js
@@ -0,0 +1,66 @@
+'use strict';
+
+const path = require('path');
+
+const Promise = require('bluebird');
+
+const fs = Promise.promisifyAll(require('fs'));
+
+const globby = require('globby');
+
+const debug = require('debug')('purs-loader')
+
+const srcModuleRegex = /(?:^|\n)module\s+([\w\.]+)/i
+
+function match(str) {
+  const matches = str.match(srcModuleRegex);
+  return matches && matches[1];
+}
+module.exports.match = match;
+
+function makeMapEntry(filePurs) {
+  const dirname = path.dirname(filePurs);
+
+  const basename = path.basename(filePurs, '.purs');
+
+  const fileJs = path.join(dirname, `${basename}.js`);
+
+  const result = Promise.props({
+    filePurs: fs.readFileAsync(filePurs, 'utf8'),
+    fileJs: fs.readFileAsync(fileJs, 'utf8').catch(() => undefined)
+  }).then(fileMap => {
+    const sourcePurs = fileMap.filePurs;
+
+    const sourceJs = fileMap.fileJs;
+
+    const moduleName = match(sourcePurs);
+
+    const map = {};
+
+    map[moduleName] = map[moduleName] || {};
+
+    map[moduleName].src = path.resolve(filePurs);
+
+    if (sourceJs) {
+      map[moduleName].ffi = path.resolve(fileJs);
+    }
+
+    return map;
+  });
+
+  return result;
+}
+module.exports.makeMapEntry = makeMapEntry;
+
+function makeMap(src) {
+  debug('loading PureScript source and FFI files from %o', src);
+
+  const globs = [].concat(src);
+
+  return globby(globs).then(paths =>
+    Promise.all(paths.map(makeMapEntry)).then(result =>
+      result.reduce(Object.assign, {})
+    )
+  );
+}
+module.exports.makeMap = makeMap;
diff --git a/src/Psc.js b/src/Psc.js
new file mode 100644
index 0000000..9269e0f
--- /dev/null
+++ b/src/Psc.js
@@ -0,0 +1,92 @@
+'use strict';
+
+const path = require('path');
+
+const Promise = require('bluebird')
+
+const fs = Promise.promisifyAll(require('fs'))
+
+const spawn = require('cross-spawn')
+
+const debug = require('debug')('purs-loader');
+
+const dargs = require('./dargs');
+
+function compile(psModule) {
+  const options = psModule.options
+  const cache = psModule.cache
+  const stderr = []
+
+  if (cache.compilationStarted) return Promise.resolve(psModule)
+
+  cache.compilationStarted = true
+
+  const args = dargs(Object.assign({
+    _: options.src,
+    output: options.output,
+  }, options.pscArgs))
+
+  debug('spawning compiler %s %o', options.psc, args)
+
+  return (new Promise((resolve, reject) => {
+    console.log('\nCompiling PureScript...')
+
+    const compilation = spawn(options.psc, args)
+
+    compilation.stdout.on('data', data => stderr.push(data.toString()))
+    compilation.stderr.on('data', data => stderr.push(data.toString()))
+
+    compilation.on('close', code => {
+      console.log('Finished compiling PureScript.')
+      cache.compilationFinished = true
+      if (code !== 0) {
+        cache.errors = stderr.join('')
+        reject(true)
+      } else {
+        cache.warnings = stderr.join('')
+        resolve(psModule)
+      }
+    })
+  }))
+  .then(compilerOutput => {
+    if (options.bundle) {
+      return bundle(options, cache).then(() => psModule)
+    }
+    return psModule
+  })
+}
+module.exports.compile = compile;
+
+function bundle(options, cache) {
+  if (cache.bundle) return Promise.resolve(cache.bundle)
+
+  const stdout = []
+  const stderr = cache.bundle = []
+
+  const args = dargs(Object.assign({
+    _: [path.join(options.output, '*', '*.js')],
+    output: options.bundleOutput,
+    namespace: options.bundleNamespace,
+  }, options.pscBundleArgs))
+
+  cache.bundleModules.forEach(name => args.push('--module', name))
+
+  debug('spawning bundler %s %o', options.pscBundle, args.join(' '))
+
+  return (new Promise((resolve, reject) => {
+    console.log('Bundling PureScript...')
+
+    const compilation = spawn(options.pscBundle, args)
+
+    compilation.stdout.on('data', data => stdout.push(data.toString()))
+    compilation.stderr.on('data', data => stderr.push(data.toString()))
+    compilation.on('close', code => {
+      if (code !== 0) {
+        cache.errors = (cache.errors || '') + stderr.join('')
+        return reject(true)
+      }
+      cache.bundle = stderr
+      resolve(fs.appendFileAsync('output/bundle.js', `module.exports = ${options.bundleNamespace}`))
+    })
+  }))
+}
diff --git a/src/PscIde.js b/src/PscIde.js
new file mode 100644
index 0000000..d99b639
--- /dev/null
+++ b/src/PscIde.js
@@ -0,0 +1,231 @@
+'use strict';
+
+const path = require('path');
+
+const Promise = require('bluebird');
+
+const fs = Promise.promisifyAll(require('fs'));
+
+const retryPromise = require('promise-retry');
+
+const spawn = require('cross-spawn');
+
+const colors = require('chalk');
+
+const debug = require('debug')('purs-loader');
+
+const dargs = require('./dargs');
+
+const Psc = require('./Psc');
+
+const PsModuleMap = require('./PsModuleMap');
+
+function connect(psModule) {
+  const options = psModule.options
+  const cache = psModule.cache
+
+  if (cache.ideServer) return Promise.resolve(psModule)
+
+  cache.ideServer = true
+
+  const connect_ = () => new Promise((resolve, reject) => {
+    const args = dargs(options.pscIdeArgs)
+
+    debug('attempting to connect to psc-ide-server', args)
+
+    const ideClient = spawn('psc-ide-client', args)
+
+    ideClient.stderr.on('data', data => {
+      debug(data.toString())
+      cache.ideServer = false
+      reject(true)
+    })
+    ideClient.stdout.once('data', data => {
+      debug(data.toString())
+      if (data.toString()[0] === '{') {
+        const res = JSON.parse(data.toString())
+        if (res.resultType === 'success') {
+          cache.ideServer = ideServer
+          resolve(psModule)
+        } else {
+          cache.ideServer = ideServer
+          reject(true)
+        }
+      } else {
+        cache.ideServer = false
+        reject(true)
+      }
+    })
+    ideClient.stdin.resume()
+    ideClient.stdin.write(JSON.stringify({ command: 'load' }))
+    ideClient.stdin.write('\n')
+  })
+
+  const args = dargs(Object.assign({
+    outputDirectory: options.output,
+  }, options.pscIdeArgs))
+
+  debug('attempting to start psc-ide-server', args)
+
+  const ideServer = cache.ideServer = spawn('psc-ide-server', [])
+  ideServer.stderr.on('data', data => {
+    debug(data.toString())
+  })
+
+  return retryPromise((retry, number) => {
+    return connect_().catch(error => {
+      if (!cache.ideServer && number === 9) {
+        debug(error)
+
+        console.log(
+          'failed to connect to or start psc-ide-server, ' +
+          'full compilation will occur on rebuild'
+        )
+
+        return Promise.resolve(psModule)
+      }
+
+      return retry(error)
+    })
+  }, {
+    retries: 9,
+    factor: 1,
+    minTimeout: 333,
+    maxTimeout: 333,
+  })
+}
+module.exports.connect = connect;
+
+function rebuild(psModule) {
+  const options = psModule.options
+  const cache = psModule.cache
+
+  debug('attempting rebuild with psc-ide-client %s', psModule.srcPath)
+
+  const request = (body) => new Promise((resolve, reject) => {
+    const args = dargs(options.pscIdeArgs)
+    const ideClient = spawn('psc-ide-client', args)
+
+    var stdout = ''
+    var stderr = ''
+
+    ideClient.stdout.on('data', data => {
+      stdout = stdout + data.toString()
+    })
+
+    ideClient.stderr.on('data', data => {
+      stderr = stderr + data.toString()
+    })
+
+    ideClient.on('close', code => {
+      if (code !== 0) {
+        const error = stderr === '' ? 'Failed to spawn psc-ide-client' : stderr
+        return reject(new Error(error))
+      }
+
+      let res = null
+
+      try {
+        res = JSON.parse(stdout.toString())
+        debug(res)
+      } catch (err) {
+        return reject(err)
+      }
+
+      if (res && !Array.isArray(res.result)) {
+        return res.resultType === 'success'
+               ? resolve(psModule)
+               : reject('psc-ide rebuild failed')
+      }
+
+      Promise.map(res.result, (item, i) => {
+        debug(item)
+        return formatIdeResult(item, options, i, res.result.length)
+      })
+      .then(compileMessages => {
+        if (res.resultType === 'error') {
+          if (res.result.some(item => item.errorCode === 'UnknownModule' || item.errorCode === 'UnknownName')) {
+            debug('unknown module, attempting full recompile')
+            return Psc.compile(psModule)
+              .then(() => PsModuleMap.makeMap(options.src).then(map => {
+                debug('rebuilt module map');
+                cache.psModuleMap = map;
+              }))
+              .then(() => request({ command: 'load' }))
+              .then(resolve)
+              .catch(() => reject('psc-ide rebuild failed'))
+          }
+          cache.errors = compileMessages.join('\n')
+          reject('psc-ide rebuild failed')
+        } else {
+          cache.warnings = compileMessages.join('\n')
+          resolve(psModule)
+        }
+      })
+    })
+
+    ideClient.stdin.write(JSON.stringify(body))
+    ideClient.stdin.write('\n')
+  })
+
+  return request({
+    command: 'rebuild',
+    params: {
+      file: psModule.srcPath,
+    }
+  })
+}
+module.exports.rebuild = rebuild;
+
+function formatIdeResult(result, options, index, length) {
+  const srcPath = path.relative(options.context, result.filename)
+  const pos = result.position
+  const fileAndPos = `${srcPath}:${pos.startLine}:${pos.startColumn}`
+  let numAndErr = `[${index+1}/${length} ${result.errorCode}]`
+  numAndErr = options.pscIdeColors ? colors.yellow(numAndErr) : numAndErr
+
+  return fs.readFileAsync(result.filename, 'utf8').then(source => {
+    const lines = source.split('\n').slice(pos.startLine - 1, pos.endLine)
+    const endsOnNewline = pos.endColumn === 1 && pos.startLine !== pos.endLine
+    const up = options.pscIdeColors ? colors.red('^') : '^'
+    const down = options.pscIdeColors ? colors.red('v') : 'v'
+    let trimmed = lines.slice(0)
+
+    if (endsOnNewline) {
+      lines.splice(lines.length - 1, 1)
+      pos.endLine = pos.endLine - 1
+      pos.endColumn = lines[lines.length - 1].length || 1
+    }
+
+    // strip newlines at the end
+    if (endsOnNewline) {
+      trimmed = lines.reverse().reduce((trimmed, line, i) => {
+        if (i === 0 && line === '') trimmed.trimming = true
+        if (!trimmed.trimming) trimmed.push(line)
+        if (trimmed.trimming && line !== '') {
+          trimmed.trimming = false
+          trimmed.push(line)
+        }
+        return trimmed
+      }, []).reverse()
+      pos.endLine = pos.endLine - (lines.length - trimmed.length)
+      pos.endColumn = trimmed[trimmed.length - 1].length || 1
+    }
+
+    const spaces = ' '.repeat(String(pos.endLine).length)
+    let snippet = trimmed.map((line, i) => {
+      return `  ${pos.startLine + i}  ${line}`
+    }).join('\n')
+
+    if (trimmed.length === 1) {
+      snippet += `\n  ${spaces}  ${' '.repeat(pos.startColumn - 1)}${up.repeat(pos.endColumn - pos.startColumn + 1)}`
+    } else {
+      snippet = `  ${spaces}  ${' '.repeat(pos.startColumn - 1)}${down}\n${snippet}`
+      snippet += `\n  ${spaces}  ${' '.repeat(pos.endColumn - 1)}${up}`
+    }
+
+    return Promise.resolve(
+      `\n${numAndErr} ${fileAndPos}\n\n${snippet}\n\n${result.message}`
+    )
+  })
+}
diff --git a/src/dargs.js b/src/dargs.js
new file mode 100644
index 0000000..e5c574c
--- /dev/null
+++ b/src/dargs.js
@@ -0,0 +1,16 @@
+'use strict';
+
+function dargs(obj) {
+  return Object.keys(obj).reduce((args, key) => {
+    const arg = '--' + key.replace(/[A-Z]/g, '-$&').toLowerCase();
+    const val = obj[key]
+
+    if (key === '_') val.forEach(v => args.push(v))
+    else if (Array.isArray(val)) val.forEach(v => args.push(arg, v))
+    else args.push(arg, obj[key])
+
+    return args.filter(arg => (typeof arg !== 'boolean'))
+  }, [])
+}
+
+module.exports = dargs;
diff --git a/src/index.js b/src/index.js
index cfba1e2..fe1455b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,17 +1,16 @@
 'use strict'
 
-const colors = require('chalk')
 const debug = require('debug')('purs-loader')
 const loaderUtils = require('loader-utils')
-const globby = require('globby')
 const Promise = require('bluebird')
 const fs = Promise.promisifyAll(require('fs'))
-const spawn = require('cross-spawn')
 const path = require('path')
-const retryPromise = require('promise-retry')
 const jsStringEscape = require('js-string-escape')
+const PsModuleMap = require('./PsModuleMap');
+const Psc = require('./Psc');
+const PscIde = require('./PscIde');
+const dargs = require('./dargs');
 
-const srcModuleRegex = /(?:^|\n)module\s+([\w\.]+)/i
 const requireRegex = /require\(['"]\.\.\/([\w\.]+)['"]\)/g
 
 module.exports = function purescriptLoader(source, map) {
@@ -45,7 +44,7 @@ module.exports = function purescriptLoader(source, map) {
   let cache = config.purescriptLoaderCache = config.purescriptLoaderCache || {
     rebuild: false,
     deferred: [],
-    bundleModules: [],
+    bundleModules: []
   }
 
   if (!config.purescriptLoaderInstalled) {
@@ -53,10 +52,14 @@ module.exports = function purescriptLoader(source, map) {
 
     // invalidate loader cache when bundle is marked as invalid (in watch mode)
     this._compiler.plugin('invalid', () => {
+      debug('invalidating loader cache');
+
       cache = config.purescriptLoaderCache = {
         rebuild: options.pscIde,
         deferred: [],
-        ideServer: cache.ideServer
+        bundleModules: [],
+        ideServer: cache.ideServer,
+        psModuleMap: cache.psModuleMap
       }
     })
 
@@ -74,7 +77,7 @@ module.exports = function purescriptLoader(source, map) {
     })
   }
 
-  const psModuleName = match(srcModuleRegex, source)
+  const psModuleName = PsModuleMap.match(source)
   const psModule = {
     name: psModuleName,
     load: js => callback(null, js),
@@ -93,8 +96,8 @@ module.exports = function purescriptLoader(source, map) {
   }
 
   if (cache.rebuild) {
-    return connectIdeServer(psModule)
-      .then(rebuild)
+    return PscIde.connect(psModule)
+      .then(PscIde.rebuild)
       .then(toJavaScript)
       .then(psModule.load)
       .catch(psModule.reject)
@@ -109,7 +112,11 @@ module.exports = function purescriptLoader(source, map) {
   cache.deferred.push(psModule)
 
   if (!cache.compilationStarted) {
-    return compile(psModule)
+    return Psc.compile(psModule)
+       .then(() => PsModuleMap.makeMap(options.src).then(map => {
+         debug('rebuilt module map');
+         cache.psModuleMap = map;
+       }))
       .then(() => Promise.map(cache.deferred, psModule => {
         if (typeof cache.ideServer === 'object') cache.ideServer.kill()
         return toJavaScript(psModule).then(psModule.load)
@@ -121,6 +128,26 @@ module.exports = function purescriptLoader(source, map) {
   }
 }
 
+function updatePsModuleMap(psModule) {
+  const options = psModule.options
+  const cache = psModule.cache
+  const filePurs = psModule.srcPath
+  if (!cache.psModuleMap) {
+    debug('module mapping does not exist');
+    return PsModuleMap.makeMap(options.src).then(map => {
+      cache.psModuleMap = map;
+      return cache.psModuleMap;
+    });
+  }
+  else {
+    return PsModuleMap.makeMapEntry(filePurs).then(result => {
+      const map = Object.assign(cache.psModuleMap, result)
+      cache.psModuleMap = map;
+      return cache.psModuleMap;
+    });
+  }
+}
+
 // The actual loader is executed *after* purescript compilation.
 function toJavaScript(psModule) {
   const options = psModule.options
@@ -132,7 +159,7 @@ function toJavaScript(psModule) {
 
   return Promise.props({
     js: fs.readFileAsync(jsPath, 'utf8'),
-    psModuleMap: psModuleMap(options, cache)
+    psModuleMap: updatePsModuleMap(psModule)
   }).then(result => {
     let js = ''
 
@@ -156,346 +183,3 @@ function toJavaScript(psModule) {
     return js
   })
 }
-
-function compile(psModule) {
-  const options = psModule.options
-  const cache = psModule.cache
-  const stderr = []
-
-  if (cache.compilationStarted) return Promise.resolve(psModule)
-
-  cache.compilationStarted = true
-
-  const args = dargs(Object.assign({
-    _: options.src,
-    output: options.output,
-  }, options.pscArgs))
-
-  debug('spawning compiler %s %o', options.psc, args)
-
-  return (new Promise((resolve, reject) => {
-    console.log('\nCompiling PureScript...')
-
-    const compilation = spawn(options.psc, args)
-
-    compilation.stdout.on('data', data => stderr.push(data.toString()))
-    compilation.stderr.on('data', data => stderr.push(data.toString()))
-
-    compilation.on('close', code => {
-      console.log('Finished compiling PureScript.')
-      cache.compilationFinished = true
-      if (code !== 0) {
-        cache.errors = stderr.join('')
-        reject(true)
-      } else {
-        cache.warnings = stderr.join('')
-        resolve(psModule)
-      }
-    })
-  }))
-  .then(compilerOutput => {
-    if (options.bundle) {
-      return bundle(options, cache).then(() => psModule)
-    }
-    return psModule
-  })
-}
-
-function rebuild(psModule) {
-  const options = psModule.options
-  const cache = psModule.cache
-
-  debug('attempting rebuild with psc-ide-client %s', psModule.srcPath)
-
-  const request = (body) => new Promise((resolve, reject) => {
-    const args = dargs(options.pscIdeArgs)
-    const ideClient = spawn('psc-ide-client', args)
-
-    var stdout = ''
-    var stderr = ''
-
-    ideClient.stdout.on('data', data => {
-      stdout = stdout + data.toString()
-    })
-
-    ideClient.stderr.on('data', data => {
-      stderr = stderr + data.toString()
-    })
-
-    ideClient.on('close', code => {
-      if (code !== 0) {
-        const error = stderr === '' ? 'Failed to spawn psc-ide-client' : stderr
-        return reject(new Error(error))
-      }
-
-      let res = null
-
-      try {
-        res = JSON.parse(stdout.toString())
-        debug(res)
-      } catch (err) {
-        return reject(err)
-      }
-
-      if (res && !Array.isArray(res.result)) {
-        return res.resultType === 'success'
-               ? resolve(psModule)
-               : reject('psc-ide rebuild failed')
-      }
-
-      Promise.map(res.result, (item, i) => {
-        debug(item)
-        return formatIdeResult(item, options, i, res.result.length)
-      })
-      .then(compileMessages => {
-        if (res.resultType === 'error') {
-          if (res.result.some(item => item.errorCode === 'UnknownModule')) {
-            console.log('Unknown module, attempting full recompile')
-            return compile(psModule)
-              .then(() => request({ command: 'load' }))
-              .then(resolve)
-              .catch(() => reject('psc-ide rebuild failed'))
-          }
-          cache.errors = compileMessages.join('\n')
-          reject('psc-ide rebuild failed')
-        } else {
-          cache.warnings = compileMessages.join('\n')
-          resolve(psModule)
-        }
-      })
-    })
-
-    ideClient.stdin.write(JSON.stringify(body))
-    ideClient.stdin.write('\n')
-  })
-
-  return request({
-    command: 'rebuild',
-    params: {
-      file: psModule.srcPath,
-    }
-  })
-}
-
-function formatIdeResult(result, options, index, length) {
-  const srcPath = path.relative(options.context, result.filename)
-  const pos = result.position
-  const fileAndPos = `${srcPath}:${pos.startLine}:${pos.startColumn}`
-  let numAndErr = `[${index+1}/${length} ${result.errorCode}]`
-  numAndErr = options.pscIdeColors ? colors.yellow(numAndErr) : numAndErr
-
-  return fs.readFileAsync(result.filename, 'utf8').then(source => {
-    const lines = source.split('\n').slice(pos.startLine - 1, pos.endLine)
-    const endsOnNewline = pos.endColumn === 1 && pos.startLine !== pos.endLine
-    const up = options.pscIdeColors ? colors.red('^') : '^'
-    const down = options.pscIdeColors ? colors.red('v') : 'v'
-    let trimmed = lines.slice(0)
-
-    if (endsOnNewline) {
-      lines.splice(lines.length - 1, 1)
-      pos.endLine = pos.endLine - 1
-      pos.endColumn = lines[lines.length - 1].length || 1
-    }
-
-    // strip newlines at the end
-    if (endsOnNewline) {
-      trimmed = lines.reverse().reduce((trimmed, line, i) => {
-        if (i === 0 && line === '') trimmed.trimming = true
-        if (!trimmed.trimming) trimmed.push(line)
-        if (trimmed.trimming && line !== '') {
-          trimmed.trimming = false
-          trimmed.push(line)
-        }
-        return trimmed
-      }, []).reverse()
-      pos.endLine = pos.endLine - (lines.length - trimmed.length)
-      pos.endColumn = trimmed[trimmed.length - 1].length || 1
-    }
-
-    const spaces = ' '.repeat(String(pos.endLine).length)
-    let snippet = trimmed.map((line, i) => {
-      return `  ${pos.startLine + i}  ${line}`
-    }).join('\n')
-
-    if (trimmed.length === 1) {
-      snippet += `\n  ${spaces}  ${' '.repeat(pos.startColumn - 1)}${up.repeat(pos.endColumn - pos.startColumn + 1)}`
-    } else {
-      snippet = `  ${spaces}  ${' '.repeat(pos.startColumn - 1)}${down}\n${snippet}`
-      snippet += `\n  ${spaces}  ${' '.repeat(pos.endColumn - 1)}${up}`
-    }
-
-    return Promise.resolve(
-      `\n${numAndErr} ${fileAndPos}\n\n${snippet}\n\n${result.message}`
-    )
-  })
-}
-
-function bundle(options, cache) {
-  if (cache.bundle) return Promise.resolve(cache.bundle)
-
-  const stdout = []
-  const stderr = cache.bundle = []
-
-  const args = dargs(Object.assign({
-    _: [path.join(options.output, '*', '*.js')],
-    output: options.bundleOutput,
-    namespace: options.bundleNamespace,
-  }, options.pscBundleArgs))
-
-  cache.bundleModules.forEach(name => args.push('--module', name))
-
-  debug('spawning bundler %s %o', options.pscBundle, args.join(' '))
-
-  return (new Promise((resolve, reject) => {
-    console.log('Bundling PureScript...')
-
-    const compilation = spawn(options.pscBundle, args)
-
-    compilation.stdout.on('data', data => stdout.push(data.toString()))
-    compilation.stderr.on('data', data => stderr.push(data.toString()))
-    compilation.on('close', code => {
-      if (code !== 0) {
-        cache.errors = (cache.errors || '') + stderr.join('')
-        return reject(true)
-      }
-      cache.bundle = stderr
-      resolve(fs.appendFileAsync('output/bundle.js', `module.exports = ${options.bundleNamespace}`))
-    })
-  }))
-}
-
-// map of PS module names to their source path
-function psModuleMap(options, cache) {
-  if (cache.psModuleMap) return Promise.resolve(cache.psModuleMap)
-
-  const globs = [].concat(options.src);
-
-  function pursToJs(file){
-    const dirname = path.dirname(file)
-    const basename = path.basename(file, '.purs')
-    const fileJS = path.join(dirname, `${basename}.js`)
-    return fileJS
-  }
-
-  return globby(globs).then(paths => {
-    return Promise
-      .props(paths.reduce((map, file) => {
-        const fileJS = pursToJs(file)
-        map[file] = fs.readFileAsync(file, 'utf8')
-        map[fileJS] = fs.readFileAsync(fileJS, 'utf8').catch(() => undefined)
-        return map
-      }, {}))
-      .then(fileMap => {
-        cache.psModuleMap = Object.keys(fileMap).reduce((map, file) => {
-          const ext = path.extname(file)
-          const isPurs = ext.match(/purs$/i)
-          if (isPurs) {
-            const fileJs = pursToJs(file)
-            const source = fileMap[file]
-            const ffi = fileMap[fileJs]
-            const moduleName = match(srcModuleRegex, source)
-            map[moduleName] = map[moduleName] || {}
-            map[moduleName].src = path.resolve(file)
-            if (ffi) {
-              map[moduleName].ffi = path.resolve(fileJs)
-            }
-          }
-          return map
-        }, {})
-        return cache.psModuleMap
-      })
-  })
-}
-
-function connectIdeServer(psModule) {
-  const options = psModule.options
-  const cache = psModule.cache
-
-  if (cache.ideServer) return Promise.resolve(psModule)
-
-  cache.ideServer = true
-
-  const connect = () => new Promise((resolve, reject) => {
-    const args = dargs(options.pscIdeArgs)
-
-    debug('attempting to connect to psc-ide-server', args)
-
-    const ideClient = spawn('psc-ide-client', args)
-
-    ideClient.stderr.on('data', data => {
-      debug(data.toString())
-      cache.ideServer = false
-      reject(true)
-    })
-    ideClient.stdout.once('data', data => {
-      debug(data.toString())
-      if (data.toString()[0] === '{') {
-        const res = JSON.parse(data.toString())
-        if (res.resultType === 'success') {
-          cache.ideServer = ideServer
-          resolve(psModule)
-        } else {
-          cache.ideServer = ideServer
-          reject(true)
-        }
-      } else {
-        cache.ideServer = false
-        reject(true)
-      }
-    })
-    ideClient.stdin.resume()
-    ideClient.stdin.write(JSON.stringify({ command: 'load' }))
-    ideClient.stdin.write('\n')
-  })
-
-  const args = dargs(Object.assign({
-    outputDirectory: options.output,
-  }, options.pscIdeArgs))
-
-  debug('attempting to start psc-ide-server', args)
-
-  const ideServer = cache.ideServer = spawn('psc-ide-server', [])
-  ideServer.stderr.on('data', data => {
-    debug(data.toString())
-  })
-
-  return retryPromise((retry, number) => {
-    return connect().catch(error => {
-      if (!cache.ideServer && number === 9) {
-        debug(error)
-
-        console.log(
-          'failed to connect to or start psc-ide-server, ' +
-          'full compilation will occur on rebuild'
-        )
-
-        return Promise.resolve(psModule)
-      }
-
-      return retry(error)
-    })
-  }, {
-    retries: 9,
-    factor: 1,
-    minTimeout: 333,
-    maxTimeout: 333,
-  })
-}
-
-function match(regex, str) {
-  const matches = str.match(regex)
-  return matches && matches[1]
-}
-
-function dargs(obj) {
-  return Object.keys(obj).reduce((args, key) => {
-    const arg = '--' + key.replace(/[A-Z]/g, '-$&').toLowerCase();
-    const val = obj[key]
-
-    if (key === '_') val.forEach(v => args.push(v))
-    else if (Array.isArray(val)) val.forEach(v => args.push(arg, v))
-    else args.push(arg, obj[key])
-
-    return args.filter(arg => (typeof arg !== 'boolean'))
-  }, [])
-}