preinstall.js

   1 "use strict";
   2
   3 const fs = require("fs");
   4 const path = require("path");
   5
   6 const { https } = require("follow-redirects");
   7 const semver = require("semver");
   8 const tar = require("tar");
   9 const unbz2 = require("unbzip2-stream");
  10 const unzipper = require("unzipper");
  11
  12 const pkg = require("./package.json");
  13 const bindir = path.join(__dirname, "bin");
  14
  15 const formatVersionKey = name =>
  16   `${name}-version`;
  17 const toSnakeCase = name =>
  18   name.replace(/-/g, '_');
  19 const formatNpmCfgVar = name =>
  20   toSnakeCase(name.toLowerCase());
  21 const formatEnvVar = name =>
  22   toSnakeCase(name.toUpperCase());
  23 const prefixNpmCfgKey = key =>
  24   `${pkg.name}:${key}`;
  25
  26 const readVersionWith = (lookup, discard = () => {}) => name => {
  27   const key = formatVersionKey(name);
  28   const version = lookup(key);
  29   return version ? {
  30     get version() { return String(version).trim() },
  31     discard() { discard(key, version) },
  32     orElse(alt) { alt.discard(); return this }
  33   } : {
  34     get version() {
  35       throw new Error(`Missing \`${name}\` version! You can provide it as a \`${prefixNpmCfgKey(key)}\` npm configuration parameter or as a \`${formatEnvVar(key)}\` environment variable.`);
  36     },
  37     discard() {},
  38     orElse(alt) { return alt }
  39   };
  40 };
  41
  42 const readPkgVersion = readVersionWith(key => pkg[key]);
  43 const readCfgVersion = readVersionWith(key => {
  44   return process.env[`npm_config_${formatNpmCfgVar(pkg.name)}_${formatNpmCfgVar(key)}`];
  45 }, (key, version) => {
  46   console.warn(`Ignoring \`${prefixNpmCfgKey(key)}\` npm configuration parameter (${version}).`);
  47 });
  48 const readEnvVersion = readVersionWith(key => {
  49   return process.env[formatEnvVar(key)];
  50 }, (key, version) => {
  51   console.warn(`Ignoring \`${formatEnvVar(key)}\` environment variable (${version}).`);
  52 });
  53
  54 const readVersion = name =>
  55   readPkgVersion(name)
  56     .orElse(readEnvVersion(name))
  57     .orElse(readCfgVersion(name))
  58     .version;
  59
  60 const dhallVersion = readVersion("dhall");
  61 const dhallJsonVersion = readVersion("dhall-json");
  62
  63 const isLesserThan = (version, upperBound) =>
  64   semver.valid(version) && semver.lt(version, upperBound);
  65
  66 if (isLesserThan(dhallJsonVersion, "1.2.8")) {
  67   throw new Error(`This release of the \`${pkg.name}\` npm package installs \`json-to-dhall\`, which isn’t provided by \`dhall-json@<1.2.8\`.`);
  68 }
  69
  70 const release = `https://github.com/dhall-lang/dhall-haskell/releases/download/${dhallVersion}/dhall-json-${dhallJsonVersion}`;
  71
  72 const get = (archive, callback) => {
  73   const url = `${release}-${archive}`;
  74   return https.get(url, res => {
  75     if (res.statusCode >= 400) throw new Error(`Error fetching ${url}: ${res.statusMessage}`);
  76     return callback(res);
  77   });
  78 };
  79
  80 if (process.platform === "win32") {
  81   get("x86_64-windows.zip", res =>
  82     res.pipe(unzipper.Extract({ path: bindir }))
  83   );
  84 } else {
  85   const isDarwin = process.platform === 'darwin';
  86
  87   if (isDarwin && isLesserThan(dhallJsonVersion, "1.4.0")) {
  88     throw new Error(`Static macOS binaries aren’t provided by \`dhall-json@<1.4.0\`.`);
  89   }
  90
  91   get(`x86_64-${isDarwin ? 'macos' : 'linux'}.tar.bz2`, res =>
  92     res.pipe(unbz2()).pipe(tar.x({ C: __dirname }).on("finish", () => {
  93       fs.readdir(bindir, (err, names) => {
  94         if (err) throw err;
  95         for (const name of names) {
  96           fs.rename(path.join(bindir, name), path.join(bindir, name + ".exe"), err => {
  97             if (err) throw err;
  98           });
  99         }
 100       });
 101     }))
 102   );
 103 }