src/PsModuleMap.js

   1 'use strict';
   2
   3 const path = require('path');
   4
   5 const Promise = require('bluebird');
   6
   7 const fs = Promise.promisifyAll(require('fs'));
   8
   9 const globby = require('globby');
  10
  11 const debug = require('debug')('purs-loader')
  12
  13 const srcModuleRegex = /(?:^|\n)module\s+([\w\.]+)/i
  14
  15 function match(str) {
  16   const matches = str.match(srcModuleRegex);
  17   return matches && matches[1];
  18 }
  19 module.exports.match = match;
  20
  21 function makeMapEntry(filePurs) {
  22   const dirname = path.dirname(filePurs);
  23
  24   const basename = path.basename(filePurs, '.purs');
  25
  26   const fileJs = path.join(dirname, `${basename}.js`);
  27
  28   const result = Promise.props({
  29     filePurs: fs.readFileAsync(filePurs, 'utf8'),
  30     fileJs: fs.readFileAsync(fileJs, 'utf8').catch(() => undefined)
  31   }).then(fileMap => {
  32     const sourcePurs = fileMap.filePurs;
  33
  34     const sourceJs = fileMap.fileJs;
  35
  36     const moduleName = match(sourcePurs);
  37
  38     const map = {};
  39
  40     map[moduleName] = map[moduleName] || {};
  41
  42     map[moduleName].src = path.resolve(filePurs);
  43
  44     if (sourceJs) {
  45       map[moduleName].ffi = path.resolve(fileJs);
  46     }
  47
  48     return map;
  49   });
  50
  51   return result;
  52 }
  53 module.exports.makeMapEntry = makeMapEntry;
  54
  55 function makeMap(src) {
  56   debug('loading PureScript source and FFI files from %o', src);
  57
  58   const globs = [].concat(src);
  59
  60   return globby(globs).then(paths =>
  61     Promise.all(paths.map(makeMapEntry)).then(result =>
  62       result.reduce(Object.assign, {})
  63     )
  64   );
  65 }
  66 module.exports.makeMap = makeMap;