Add osenv.shell()

README.md

@@ -56,3 +56,8 @@ executables.
 Return the executable name of the editor program.  This uses the EDITOR
 and VISUAL environment variables, and falls back to `vi` on Unix, or
 `notepad.exe` on Windows.
+
+## osenv.shell()
+
+The SHELL on Unix, which Windows calls the ComSpec.  Defaults to 'bash'
+or 'cmd'.

osenv.js

@@ -74,3 +74,7 @@ memo('editor', function () {
          (isWindows ? 'notepad.exe' : 'vi')
 })
 
+memo('shell', function () {
+  return isWindows ? process.env.ComSpec || 'cmd'
+         : process.env.SHELL || 'bash'
+})

test/unix.js

@@ -21,6 +21,7 @@ process.env.PATH = '/opt/local/bin:/usr/local/bin:/usr/bin/:bin'
 process.env.PS1 = '(o_o) $ '
 process.env.EDITOR = 'edit'
 process.env.VISUAL = 'visualedit'
+process.env.SHELL = 'zsh'
 
 
 tap.test('basic unix sanity test', function (t) {
@@ -65,5 +66,11 @@ tap.test('basic unix sanity test', function (t) {
   var osenv = require('../osenv.js')
   t.equal(osenv.editor(), 'vi')
 
+  t.equal(osenv.shell(), 'zsh')
+  process.env.SHELL = ''
+  delete require.cache[require.resolve('../osenv.js')]
+  var osenv = require('../osenv.js')
+  t.equal(osenv.shell(), 'bash')
+
   t.end()
 })

test/windows.js

@@ -24,6 +24,7 @@ process.env.Path = 'C:\\Program Files\\;C:\\Binary Stuff\\bin'
 process.env.PROMPT = '(o_o) $ '
 process.env.EDITOR = 'edit'
 process.env.VISUAL = 'visualedit'
+process.env.ComSpec = 'some-com'
 
 tap.test('basic windows sanity test', function (t) {
   var osenv = require('../osenv.js')
@@ -71,5 +72,11 @@ tap.test('basic windows sanity test', function (t) {
   var osenv = require('../osenv.js')
   t.equal(osenv.editor(), 'notepad.exe')
 
+  t.equal(osenv.shell(), 'some-com')
+  process.env.ComSpec = ''
+  delete require.cache[require.resolve('../osenv.js')]
+  var osenv = require('../osenv.js')
+  t.equal(osenv.shell(), 'cmd')
+
   t.end()
 })