Auto generate a list of supported locales whenever translations are updated

lib/l10n/collect_translations.py

@@ -15,8 +15,6 @@ import glob
 from posixpath import dirname
 import shutil
 import re
-import json
-import sys
 
 def process_locale_file(filename, locale_name):
     """
@@ -84,11 +82,38 @@ def copy_locale_file(path):
                 process_locale_file(fallback_file, locale)
 
 
+def generate_locale_list(locales):
+    """
+    Generate a .dart file which contains all the supported locales,
+    for importing into the project
+    """
+    
+    with open("supported_locales.dart", "w") as output:
+
+        output.write("// This file is auto-generated by the 'collect_translations.py' script - do not edit it directly!\n\n")
+
+        output.write('import "package:flutter/material.dart";\n\n')
+
+        output.write("const List<Locale> supported_locales = [\n");
+
+        for locale in locales:
+            splt = locale.split("_")
+
+            if len(splt) == 2:
+                lc, cc = splt
+            else:
+                lc = locale
+                cc = ''
+            
+            output.write(f'    const Locale("{lc}", "{cc}"),   // Translations avilable in app_{locale}.arb\n')
+
+        output.write("];\n")
+        output.write("")
+
 if __name__ == '__main__':
 
     here = os.path.abspath(os.path.dirname(__file__))
 
-
     # Ensure the 'collected' output directory exists
     output_dir = os.path.join(here, 'collected')
     os.makedirs(output_dir, exist_ok=True)
@@ -99,7 +124,7 @@ if __name__ == '__main__':
     for arb in arbs:
         os.remove(arb)
 
-    locales = []
+    locales = ['en']
 
     for locale in os.listdir(here):
 
@@ -111,6 +136,7 @@ if __name__ == '__main__':
 
         if os.path.exists(f) and os.path.isdir(locale):
             copy_locale_file(f)
+            locales.append(locale)
 
     # Ensure the translation source file ('app_en.arb') is copied also
     # Note that this does not require any further processing
@@ -118,3 +144,7 @@ if __name__ == '__main__':
     dst = os.path.join(here, 'collected', 'app_en.arb')
 
     shutil.copyfile(src, dst)
+
+    generate_locale_list(locales)
+
+    print(f"Updated translations for {len(locales)} locales.")