aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/index.js
blob: 3f5e6a823d6a0b77bd9a19834019fdf7196d97ef (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
'use strict'

const debug = require('debug')('purs-loader')
const loaderUtils = require('loader-utils')
const Promise = require('bluebird')
const path = require('path')
const PsModuleMap = require('./PsModuleMap');
const Psc = require('./Psc');
const PscIde = require('./PscIde');
const toJavaScript = require('./to-javascript');
const dargs = require('./dargs');
const spawn = require('cross-spawn').sync
const eol = require('os').EOL

module.exports = function purescriptLoader(source, map) {
  const callback = this.async()
  const config = this.options
  const query = loaderUtils.parseQuery(this.query)
  const webpackOptions = this.options.purescriptLoader || {}

  const depsPaths = (pscPackage => {
    if (pscPackage) {
      debug('calling psc-package...')

      return spawn('psc-package', ['sources']).stdout.toString().split(eol).filter(v => v != '')
    }
    else {
      return [ path.join('bower_components', 'purescript-*', 'src', '**', '*.purs') ]
    }
  })

  let options = Object.assign(webpackOptions, query)

  const defaultDeps = depsPaths(options.pscPackage)
  const defaultOptions = {
    context: config.context,
    psc: 'psc',
    pscArgs: {},
    pscBundle: 'psc-bundle',
    pscBundleArgs: {},
    pscIde: false,
    pscIdeColors: options.psc === 'psa',
    pscIdeArgs: {},
    pscPackage: false,
    bundleOutput: 'output/bundle.js',
    bundleNamespace: 'PS',
    bundle: false,
    warnings: true,
    output: 'output',
    src: [
      path.join('src', '**', '*.purs'),
      ...defaultDeps
    ]
  }

  this.cacheable && this.cacheable()

  let cache = config.purescriptLoaderCache = config.purescriptLoaderCache || {
    rebuild: false,
    deferred: [],
    bundleModules: [],
    warnings: [],
    errors: []
  }

  if (options.pscPackage && options.src) {
    options.src = options.src.concat(defaultDeps) // append psc-package-provided source paths with users'
  }

  options = Object.assign(defaultOptions, options)

  if (!config.purescriptLoaderInstalled) {
    config.purescriptLoaderInstalled = true

    // 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: [],
        bundleModules: [],
        ideServer: cache.ideServer,
        psModuleMap: cache.psModuleMap,
        warnings: [],
        errors: []
      }
    });

    // add psc warnings to webpack compilation warnings
    this._compiler.plugin('after-compile', (compilation, callback) => {
      cache.warnings.forEach(warning => {
        compilation.warnings.push(warning);
      });

      cache.errors.forEach(error => {
        compilation.errors.push(error);
      });

      callback()
    });
  }

  const psModuleName = PsModuleMap.match(source)
  const psModule = {
    name: psModuleName,
    load: js => callback(null, js),
    reject: error => callback(error),
    srcPath: this.resourcePath,
    srcDir: path.dirname(this.resourcePath),
    jsPath: path.resolve(path.join(options.output, psModuleName, 'index.js')),
    options: options,
    cache: cache,
    emitWarning: warning => {
      if (options.warnings && warning.length) {
        cache.warnings.push(warning);
      }
    },
    emitError: error => {
      if (error.length) {
        cache.errors.push(error);
      }
    }
  }

  debug('loader called', psModule.name)

  if (options.bundle) {
    cache.bundleModules.push(psModule.name)
  }

  if (cache.rebuild) {
    return PscIde.connect(psModule)
      .then(PscIde.rebuild)
      .then(toJavaScript)
      .then(psModule.load)
      .catch(psModule.reject)
  }

  if (cache.compilationFinished) {
    return toJavaScript(psModule).then(psModule.load).catch(psModule.reject)
  }

  // We need to wait for compilation to finish before the loaders run so that
  // references to compiled output are valid.
  cache.deferred.push(psModule)

  if (!cache.compilationStarted) {
    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)
      }))
      .catch(error => {
        cache.deferred[0].reject(error)
        cache.deferred.slice(1).forEach(psModule => psModule.reject(new Error('purs-loader failed')))
      })
  }
}