From 37fbbdd40f320f50ca0f28f96e20f66c657a2a33 Mon Sep 17 00:00:00 2001
From: Douglas Christopher Wilson <doug@somethingdoug.com>
Date: Sun, 28 Oct 2018 10:43:02 -0400
Subject: [PATCH] build: install nyc on demand

---
 .travis.yml         | 10 ++---
 appveyor.yml        |  2 +-
 package.json        |  5 +--
 tool/install-nyc.js | 96 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+), 10 deletions(-)
 create mode 100644 tool/install-nyc.js

diff --git a/.travis.yml b/.travis.yml
index 53c49c826..03e9497bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -56,8 +56,7 @@ before_install:
   - "npm config set shrinkwrap false"
 
   # Setup Node.js version-specific dependencies
-  - "test $TRAVIS_NODE_VERSION != '0.6' || npm rm --save-dev nyc"
-  - "test $TRAVIS_NODE_VERSION != '0.8' || npm rm --save-dev nyc"
+  - "node tool/install-nyc.js --nyc-optional"
   - "test $(echo $TRAVIS_NODE_VERSION | cut -d. -f1) -ge 4 || npm rm --save-dev eslint"
 
   # Update Node.js modules
@@ -78,10 +77,9 @@ before_script:
   - "docker exec mysql mysql -e 'select version()'"
 
 script:
-  # Run test script, depending on nyc install
-  - "test ! -z $(npm -ps ls nyc) || npm test"
-  - "test   -z $(npm -ps ls nyc) || npm run-script test-ci"
-  - "test   -z $(npm -ps ls eslint) || npm run-script lint"
+  # Run test script
+  - "npm run-script test-ci"
+  - "test -z $(npm -ps ls eslint) || npm run-script lint"
 
 after_script:
   - "test -d .nyc_output && npm install coveralls@2 && nyc report --reporter=text-lcov | coveralls"
diff --git a/appveyor.yml b/appveyor.yml
index a5ee28962..ca0a86a27 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,7 +32,7 @@ install:
       catch { Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) }
   - npm config set shrinkwrap false
   - if "%nodejs_version%" equ "0.8" npm config set strict-ssl false
-  - npm rm --silent --save-dev eslint nyc
+  - npm rm --silent --save-dev eslint
   - if exist node_modules npm prune
   - if exist node_modules npm rebuild
   - npm install
diff --git a/package.json b/package.json
index e71b58bb6..a577429a8 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,6 @@
   "devDependencies": {
     "after": "0.8.2",
     "eslint": "4.19.1",
-    "nyc": "10.3.2",
     "seedrandom": "2.4.4",
     "timezone-mock": "0.0.7",
     "urun": "0.0.8",
@@ -40,8 +39,8 @@
   "scripts": {
     "lint": "eslint .",
     "test": "node test/run.js",
-    "test-ci": "nyc --reporter=text npm test",
-    "test-cov": "nyc --reporter=html --reporter=text npm test",
+    "test-ci": "node tool/install-nyc.js --nyc-optional --reporter=text -- npm test",
+    "test-cov": "node tool/install-nyc.js --reporter=html --reporter=text -- npm test",
     "version": "node tool/version-changes.js && git add Changes.md"
   }
 }
diff --git a/tool/install-nyc.js b/tool/install-nyc.js
new file mode 100644
index 000000000..8f3e8f00e
--- /dev/null
+++ b/tool/install-nyc.js
@@ -0,0 +1,96 @@
+var path  = require('path');
+var spawn = require('child_process').spawn;
+
+process.nextTick(run);
+
+function installNpmModule(name, version, callback) {
+  if (getPackageVersion(name) === version) {
+    callback();
+    return;
+  }
+
+  var spec  = name + '@' + version;
+  var args  = ['install', '--silent', '--no-save', spec];
+  var child = spawn('npm', args, {
+    cwd   : path.join(__dirname, '..'),
+    shell : true
+  });
+
+  child.stderr.resume();
+  child.stdout.resume();
+
+  child.on('exit', function (code) {
+    var err = null;
+
+    if (code !== 0) {
+      err = new Error('npm install ' + spec + ' failed with exit code ' + code);
+    }
+
+    callback(err);
+  });
+}
+
+function getNycVersion() {
+  var nodeVersion = process.version.replace(/^v/, '').split('.')
+    .map(function (s) { return Number(s); });
+
+  if (nodeVersion[0] === 0 && nodeVersion[1] < 10) {
+    return undefined;
+  } else if (nodeVersion[0] < 4) {
+    return '10.3.2';
+  } else if (nodeVersion[0] < 6) {
+    return '11.9.0';
+  } else {
+    return '13.1.0';
+  }
+}
+
+function getPackageVersion(name) {
+  try {
+    return require(name + '/package').version;
+  } catch (e) {
+    return undefined;
+  }
+}
+
+function run() {
+  var args    = process.argv.slice(2);
+  var cmd     = null;
+  var divider = args.indexOf('--');
+  var version = getNycVersion();
+
+  if (divider !== -1) {
+    cmd  = args.slice(divider + 1);
+    args = args.slice(0, divider);
+  }
+
+  if (!version && args.indexOf('--nyc-optional') === -1) {
+    console.error('nyc does not support current Node.js version');
+    process.exit(1);
+  } else if (version) {
+    installNpmModule('nyc', version, function (err) {
+      if (err) {
+        console.error(err.message);
+        process.exit(1);
+      } else if (cmd) {
+        runCmd('nyc', args.concat(cmd));
+      }
+    });
+  } else if (cmd) {
+    runCmd(cmd[0], cmd.slice(1));
+  }
+}
+
+function runCmd(cmd, args) {
+  var child = spawn(cmd, args, {
+    cwd   : path.join(__dirname, '..'),
+    shell : true
+  });
+
+  child.stderr.pipe(process.stderr, {end: false});
+  child.stdout.pipe(process.stdout, {end: false});
+
+  child.on('exit', function (code) {
+    process.exit(code);
+  });
+}