From 448efd0eaa6f97af0889bf47efc543a1ea2f8d7e Mon Sep 17 00:00:00 2001
From: Daijiro Wachi <daijiro.wachi@gmail.com>
Date: Sat, 21 Feb 2015 23:19:10 +0900
Subject: ls: allow filtering by --dev / --prod[uction]

---
 doc/cli/npm-ls.md                     | 14 +++++++
 lib/ls.js                             | 16 ++++++++
 test/tap/ls-env.js                    | 77 +++++++++++++++++++++++++++++++++++
 test/tap/shrinkwrap-dev-dependency.js |  2 +-
 4 files changed, 108 insertions(+), 1 deletion(-)
 create mode 100644 test/tap/ls-env.js

diff --git a/doc/cli/npm-ls.md b/doc/cli/npm-ls.md
index 0f0d79489..318cdd8fd 100644
--- a/doc/cli/npm-ls.md
+++ b/doc/cli/npm-ls.md
@@ -67,6 +67,20 @@ project.
 
 Max display depth of the dependency tree.
 
+### prod / production
+
+* Type: Boolean
+* Default: false
+
+Display only the dependency tree for packages in `dependencies`.
+
+### dev
+
+* Type: Boolean
+* Default: false
+
+Display only the dependency tree for packages in `devDependencies`.
+
 ## SEE ALSO
 
 * npm-config(1)
diff --git a/lib/ls.js b/lib/ls.js
index eee4f2772..05166ee6a 100644
--- a/lib/ls.js
+++ b/lib/ls.js
@@ -40,6 +40,7 @@ function ls (args, silent, cb) {
   var opt = { depth: depth, log: log.warn, dev: true }
   readInstalled(dir, opt, function (er, data) {
     pruneNestedExtraneous(data)
+    filterByEnv(data)
     var bfs = bfsify(data, args)
       , lite = getLite(bfs)
 
@@ -88,6 +89,21 @@ function pruneNestedExtraneous (data, visited) {
   }
 }
 
+function filterByEnv (data) {
+  var dev = npm.config.get("dev")
+  var production = npm.config.get("production")
+  if (dev === production) return
+  var dependencies = {}
+  var devDependencies = data.devDependencies || []
+  Object.keys(data.dependencies).forEach(function (name) {
+    var keys = Object.keys(devDependencies)
+    if (production && keys.indexOf(name) !== -1) return
+    if (dev && keys.indexOf(name) === -1) return
+    dependencies[name] = data.dependencies[name]
+  })
+  data.dependencies = dependencies
+}
+
 function alphasort (a, b) {
   a = a.toLowerCase()
   b = b.toLowerCase()
diff --git a/test/tap/ls-env.js b/test/tap/ls-env.js
new file mode 100644
index 000000000..5ff0618f4
--- /dev/null
+++ b/test/tap/ls-env.js
@@ -0,0 +1,77 @@
+var common = require('../common-tap')
+var test = require('tap').test
+var path = require('path')
+var rimraf = require('rimraf')
+var osenv = require('osenv')
+var mkdirp = require('mkdirp')
+var pkg = path.resolve(__dirname, 'ls-depth')
+var mr = require('npm-registry-mock')
+var opts = {cwd: pkg}
+
+function cleanup () {
+  process.chdir(osenv.tmpdir())
+  rimraf.sync(pkg + '/cache')
+  rimraf.sync(pkg + '/tmp')
+  rimraf.sync(pkg + '/node_modules')
+}
+
+test('setup', function (t) {
+  cleanup()
+  mkdirp.sync(pkg + '/cache')
+  mkdirp.sync(pkg + '/tmp')
+  mr({port: common.port}, function (er, s) {
+    common.npm(
+      [
+        'install',
+        '--registry', common.registry
+      ],
+      opts,
+      function (er, c) {
+        t.ifError(er, 'install ran without issue')
+        t.equal(c, 0)
+        s.close()
+        t.end()
+      }
+    )
+  })
+})
+
+test('npm ls --dev', function (t) {
+  common.npm(['ls', '--dev'], opts, function (er, code, stdout) {
+    t.ifError(er, 'ls --dev ran without issue')
+    t.equal(code, 0)
+    t.has(stdout, /(empty)/, 'output contains (empty)')
+    t.end()
+  })
+})
+
+test('npm ls --production', function (t) {
+  common.npm(['ls', '--production'], opts, function (er, code, stdout) {
+    t.ifError(er, 'ls --production ran without issue')
+    t.notOk(code, 'npm exited ok')
+    t.has(
+      stdout,
+      /test-package-with-one-dep@0\.0\.0/,
+      'output contains test-package-with-one-dep@0.0.0'
+    )
+    t.end()
+  })
+})
+
+test('npm ls --prod', function (t) {
+  common.npm(['ls', '--prod'], opts, function (er, code, stdout) {
+    t.ifError(er, 'ls --prod ran without issue')
+    t.notOk(code, 'npm exited ok')
+    t.has(
+      stdout,
+      /test-package-with-one-dep@0\.0\.0/,
+      'output contains test-package-with-one-dep@0.0.0'
+    )
+    t.end()
+  })
+})
+
+test('cleanup', function (t) {
+  cleanup()
+  t.end()
+})
diff --git a/test/tap/shrinkwrap-dev-dependency.js b/test/tap/shrinkwrap-dev-dependency.js
index 379a0d908..14eebf19f 100644
--- a/test/tap/shrinkwrap-dev-dependency.js
+++ b/test/tap/shrinkwrap-dev-dependency.js
@@ -14,7 +14,7 @@ test("shrinkwrap doesn't strip out the dependency", function (t) {
   t.plan(1)
 
   mr({port : common.port}, function (er, s) {
-    setup({ production: true }, function (err) {
+    setup({}, function (err) {
       if (err) return t.fail(err)
 
       npm.install(".", function (err) {
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