Add getOptionValue and setOptionValue

Readme.md

@@ -95,7 +95,10 @@ const program = new Command();
 
 Options are defined with the `.option()` method, also serving as documentation for the options. Each option can have a short flag (single character) and a long name, separated by a comma or space or vertical bar ('|').
 
-The parsed options can be accessed by calling `.opts()` on a `Command` object, and are passed to the action handler. Multi-word options such as "--template-engine" are camel-cased, becoming `program.opts().templateEngine` etc.
+The parsed options can be accessed by calling `.opts()` on a `Command` object, and are passed to the action handler.
+You can also use `.getOptionValue()` and `.setOptionValue()` to work with a single option value.
+
+Multi-word options such as "--template-engine" are camel-cased, becoming `program.opts().templateEngine` etc.
 
 Multiple short flags may optionally be combined in a single argument following the dash: boolean flags, followed by a single option taking a value (possibly followed by the value).
 For example `-a -b -p 80` may be written as `-ab -p80` or even `-abp80`.

index.js

@@ -1094,11 +1094,11 @@ class Command extends EventEmitter {
       // when --no-foo we make sure default is true, unless a --foo option is already defined
       if (option.negate) {
         const positiveLongFlag = option.long.replace(/^--no-/, '--');
-        defaultValue = this._findOption(positiveLongFlag) ? this._getOptionValue(name) : true;
+        defaultValue = this._findOption(positiveLongFlag) ? this.getOptionValue(name) : true;
       }
       // preassign only if we have a default
       if (defaultValue !== undefined) {
-        this._setOptionValue(name, defaultValue);
+        this.setOptionValue(name, defaultValue);
       }
     }
 
@@ -1108,7 +1108,7 @@ class Command extends EventEmitter {
     // when it's passed assign the value
     // and conditionally invoke the callback
     this.on('option:' + oname, (val) => {
-      const oldValue = this._getOptionValue(name);
+      const oldValue = this.getOptionValue(name);
 
       // custom processing
       if (val !== null && option.parseArg) {
@@ -1129,15 +1129,15 @@ class Command extends EventEmitter {
       if (typeof oldValue === 'boolean' || typeof oldValue === 'undefined') {
         // if no value, negate false, and we have a default, then use it!
         if (val == null) {
-          this._setOptionValue(name, option.negate
+          this.setOptionValue(name, option.negate
             ? false
             : defaultValue || true);
         } else {
-          this._setOptionValue(name, val);
+          this.setOptionValue(name, val);
         }
       } else if (val !== null) {
         // reassign
-        this._setOptionValue(name, option.negate ? false : val);
+        this.setOptionValue(name, option.negate ? false : val);
       }
     });
 
@@ -1325,34 +1325,34 @@ class Command extends EventEmitter {
   };
 
   /**
-   * Store option value
+   * Retrieve option value.
    *
    * @param {string} key
-   * @param {Object} value
-   * @api private
+   * @return {Object} value
    */
 
-  _setOptionValue(key, value) {
+  getOptionValue(key) {
     if (this._storeOptionsAsProperties) {
-      this[key] = value;
-    } else {
-      this._optionValues[key] = value;
+      return this[key];
     }
+    return this._optionValues[key];
   };
 
   /**
-   * Retrieve option value
+   * Store option value.
    *
    * @param {string} key
-   * @return {Object} value
-   * @api private
+   * @param {Object} value
+   * @return {Command} `this` command for chaining
    */
 
-  _getOptionValue(key) {
+  setOptionValue(key, value) {
     if (this._storeOptionsAsProperties) {
-      return this[key];
+      this[key] = value;
+    } else {
+      this._optionValues[key] = value;
     }
-    return this._optionValues[key];
+    return this;
   };
 
   /**
@@ -1764,7 +1764,7 @@ class Command extends EventEmitter {
     // Walk up hierarchy so can call in subcommand after checking for displaying help.
     for (let cmd = this; cmd; cmd = cmd.parent) {
       cmd.options.forEach((anOption) => {
-        if (anOption.mandatory && (cmd._getOptionValue(anOption.attributeName()) === undefined)) {
+        if (anOption.mandatory && (cmd.getOptionValue(anOption.attributeName()) === undefined)) {
           cmd.missingMandatoryOptionValue(anOption);
         }
       });

tests/command.chain.test.js

@@ -165,4 +165,10 @@ describe('Command methods that should return this for chaining', () => {
     const result = program.enablePositionalOptions();
     expect(result).toBe(program);
   });
+
+  test('when call .setOptionValue() then returns this', () => {
+    const program = new Command();
+    const result = program.setOptionValue();
+    expect(result).toBe(program);
+  });
 });

tests/options.getset.test.js

@@ -0,0 +1,24 @@
+const commander = require('../');
+
+describe.each([true, false])('storeOptionsAsProperties is %s', (storeOptionsAsProperties) => {
+  test('when option specified on CLI then value returned by getOptionValue', () => {
+    const program = new commander.Command();
+    program
+      .storeOptionsAsProperties(storeOptionsAsProperties)
+      .option('--cheese [type]', 'cheese type');
+    const cheeseType = 'blue';
+    program.parse(['node', 'test', '--cheese', cheeseType]);
+    expect(program.getOptionValue('cheese')).toBe(cheeseType);
+  });
+
+  test('when setOptionValue then value returned by opts', () => {
+    const program = new commander.Command();
+    const cheeseType = 'blue';
+    // Note: opts() only returns declared options when options stored as properties
+    program
+      .storeOptionsAsProperties(storeOptionsAsProperties)
+      .option('--cheese [type]', 'cheese type')
+      .setOptionValue('cheese', cheeseType);
+    expect(program.opts().cheese).toBe(cheeseType);
+  });
+});

typings/index.d.ts

@@ -465,6 +465,16 @@ export class Command {
   storeOptionsAsProperties(storeAsProperties: true): this & OptionValues;
   storeOptionsAsProperties(storeAsProperties?: boolean): this;
 
+  /**
+   * Retrieve option value.
+   */
+  getOptionValue(key: string): any;
+
+   /**
+   * Store option value.
+   */
+  setOptionValue(key: string, value: unknown): this;
+
   /**
    * Alter parsing of short flags with optional values.
    *

typings/index.test-d.ts

@@ -138,6 +138,13 @@ expectType<commander.Command & commander.OptionValues>(program.storeOptionsAsPro
 expectType<commander.Command & commander.OptionValues>(program.storeOptionsAsProperties(true));
 expectType<commander.Command>(program.storeOptionsAsProperties(false));
 
+// getOptionValue
+void program.getOptionValue('example');
+
+// setOptionValue
+expectType<commander.Command>(program.setOptionValue('example', 'value'));
+expectType<commander.Command>(program.setOptionValue('example', true));
+
 // combineFlagAndOptionalValue
 expectType<commander.Command>(program.combineFlagAndOptionalValue());
 expectType<commander.Command>(program.combineFlagAndOptionalValue(false));