Add override cli and env options

Author: motdotla

README.md

@@ -203,7 +203,7 @@ $ node -r dotenv/config your_script.js
 The configuration options below are supported as command line arguments in the format `dotenv_config_<option>=value`
 
 ```bash
-$ node -r dotenv/config your_script.js dotenv_config_path=/custom/path/to/.env
+$ node -r dotenv/config your_script.js dotenv_config_path=/custom/path/to/.env dotenv_config_debug=true
 ```
 
 Additionally, you can use environment variables to set configuration options. Command line arguments will precede these.
@@ -213,7 +213,7 @@ $ DOTENV_CONFIG_<OPTION>=value node -r dotenv/config your_script.js
 ```
 
 ```bash
-$ DOTENV_CONFIG_ENCODING=latin1 node -r dotenv/config your_script.js dotenv_config_path=/custom/path/to/.env
+$ DOTENV_CONFIG_ENCODING=latin1 DOTENV_CONFIG_DEBUG=true node -r dotenv/config your_script.js dotenv_config_path=/custom/path/to/.env
 ```
 
 ## FAQ

lib/cli-options.js

@@ -1,4 +1,4 @@
-const re = /^dotenv_config_(encoding|path|debug)=(.+)$/
+const re = /^dotenv_config_(encoding|path|debug|override)=(.+)$/
 
 module.exports = function optionMatcher (args) {
   return args.reduce(function (acc, cur) {

lib/env-options.js

@@ -13,4 +13,8 @@ if (process.env.DOTENV_CONFIG_DEBUG != null) {
   options.debug = process.env.DOTENV_CONFIG_DEBUG
 }
 
+if (process.env.DOTENV_CONFIG_OVERRIDE != null) {
+  options.override = process.env.DOTENV_CONFIG_OVERRIDE
+}
+
 module.exports = options

tests/test-cli-options.js

@@ -2,7 +2,7 @@ const t = require('tap')
 
 const options = require('../lib/cli-options')
 
-t.plan(5)
+t.plan(6)
 
 // matches encoding option
 t.same(options(['node', '-e', "'console.log(testing)'", 'dotenv_config_encoding=utf8']), {
@@ -19,6 +19,11 @@ t.same(options(['node', '-e', "'console.log(testing)'", 'dotenv_config_debug=tru
   debug: 'true'
 })
 
+// matches override option
+t.same(options(['node', '-e', "'console.log(testing)'", 'dotenv_config_override=true']), {
+  override: 'true'
+})
+
 // ignores empty values
 t.same(options(['node', '-e', "'console.log(testing)'", 'dotenv_config_path=']), {})
 

tests/test-env-options.js

@@ -8,6 +8,7 @@ require('../lib/env-options')
 const e = process.env.DOTENV_CONFIG_ENCODING
 const p = process.env.DOTENV_CONFIG_PATH
 const d = process.env.DOTENV_CONFIG_DEBUG
+const o = process.env.DOTENV_CONFIG_OVERRIDE
 
 // get fresh object for each test
 function options () {
@@ -24,12 +25,13 @@ function testOption (envVar, tmpVal, expect) {
   delete process.env[envVar]
 }
 
-t.plan(4)
+t.plan(5)
 
 // returns empty object when no options set in process.env
 delete process.env.DOTENV_CONFIG_ENCODING
 delete process.env.DOTENV_CONFIG_PATH
 delete process.env.DOTENV_CONFIG_DEBUG
+delete process.env.DOTENV_CONFIG_OVERRIDE
 
 t.same(options(), {})
 
@@ -42,7 +44,11 @@ testOption('DOTENV_CONFIG_PATH', '~/.env.test', { path: '~/.env.test' })
 // sets debug option
 testOption('DOTENV_CONFIG_DEBUG', 'true', { debug: 'true' })
 
+// sets override option
+testOption('DOTENV_CONFIG_OVERRIDE', 'true', { override: 'true' })
+
 // restore existing env
 process.env.DOTENV_CONFIG_ENCODING = e
 process.env.DOTENV_CONFIG_PATH = p
 process.env.DOTENV_CONFIG_DEBUG = d
+process.env.DOTENV_CONFIG_OVERRIDE = o