feat: Adds conditional assets generations (zoontek#441)

* feat: add conditional assets generations

* fix comments

---------

Co-authored-by: Nazarii Melnyk <nazarii.melnyk@kilo.health>

Author: nazmeln

README.md

@@ -128,6 +128,7 @@ Options:
   --logo-width <width>        logo width at @1x (in dp - we recommend approximately ~100) (default: 100)
   --assets-path [path]        path to your static assets directory (useful to require the logo file in JS)
   --flavor <flavor>           [android only] flavor build variant (outputs in an android resource directory other than "main")
+  --platforms [platforms]     platforms to generate assets for (comma separated) (default: "android,ios")
   -h, --help                  output usage information
 ```
 
@@ -138,7 +139,8 @@ yarn react-native generate-bootsplash assets/bootsplash_logo_original.png \
   --background-color=F5FCFF \
   --logo-width=100 \
   --assets-path=assets \
-  --flavor=main
+  --flavor=main \
+  --platforms=android,ios
 ```
 
 ![](https://raw.githubusercontent.com/zoontek/react-native-bootsplash/master/docs/cli_tool.png?raw=true)

react-native.config.js

@@ -32,19 +32,28 @@ module.exports = {
             '[android only] flavor build variant (outputs in an android resource directory other than "main")',
           default: "main",
         },
+        {
+          name: '--platforms [platforms]',
+          description: 'platforms to generate the splash screen for (android, ios)',
+          default: 'android,ios',
+          parse: (value) => value.split(','),
+        }
       ],
       func: (
         [logoPath],
         { project: { android, ios } },
-        { backgroundColor, logoWidth, assetsPath, flavor },
+        { backgroundColor, logoWidth, assetsPath, flavor, platforms },
       ) => {
         const workingPath =
           process.env.INIT_CWD || process.env.PWD || process.cwd();
 
+        const iosOnly = platforms.includes('ios');
+        const androidOnly = platforms.includes('android');
+
         return generate({
-          android,
+          android: android && androidOnly ? android : null,
 
-          ios: ios
+          ios: ios && iosOnly
             ? {
                 ...ios,
                 // Fix to support previous CLI versions