Support hex prefix colors with modifiers (#450)

Author: garretmh

docs/cli/prefixing.md

@@ -82,7 +82,7 @@ $ concurrently -c red,blue 'echo Hello there' 'echo General Kenobi!'
 Colors can take modifiers too. Several can be applied at once by prepending `.<modifier 1>.<modifier 2>` and so on.
 
 ```bash
-$ concurrently -c red,bold.blue.dim 'echo Hello there' 'echo General Kenobi!'
+$ concurrently -c '#23de43.inverse,bold.blue.dim' 'echo Hello there' 'echo General Kenobi!'
 ```
 
 <details>

src/logger.spec.ts

@@ -232,6 +232,21 @@ describe('#logCommandText()', () => {
         expect(logger.log).toHaveBeenCalledWith(chalk.hex(prefixColor)('[1]') + ' ', 'foo', cmd);
     });
 
+    it('logs prefix using prefixColor from command if prefixColor is a hex value with modifiers', () => {
+        const { logger } = createLogger({});
+        const prefixColor = '#32bd8a.inverse';
+        const cmd = new FakeCommand('', undefined, 1, {
+            prefixColor,
+        });
+        logger.logCommandText('foo', cmd);
+
+        expect(logger.log).toHaveBeenCalledWith(
+            chalk.hex(prefixColor).inverse('[1]') + ' ',
+            'foo',
+            cmd,
+        );
+    });
+
     it('does nothing if command is hidden by name', () => {
         const { logger } = createLogger({ hide: ['abc'] });
         const cmd = new FakeCommand('abc');

src/logger.ts

@@ -156,7 +156,12 @@ export class Logger {
     colorText(command: Command, text: string) {
         let color: chalk.Chalk;
         if (command.prefixColor?.startsWith('#')) {
-            color = this.chalk.hex(command.prefixColor);
+            const [hexColor, ...modifiers] = command.prefixColor.split('.');
+            color = this.chalk.hex(hexColor);
+            const modifiedColor = getChalkPath(color, modifiers.join('.'));
+            if (modifiedColor) {
+                color = modifiedColor;
+            }
         } else {
             const defaultColor = getChalkPath(this.chalk, defaults.prefixColors) as Chalk;
             color = getChalkPath(this.chalk, command.prefixColor ?? '') ?? defaultColor;