From 838e2b953420fb6fe5d2b2f97f56de14cfd9564d Mon Sep 17 00:00:00 2001
From: Maurits van Rees <maurits@vanrees.org>
Date: Tue, 7 Sep 2021 17:10:37 +0200
Subject: [PATCH] Support Cyrillic and Latin character sets for Serbian.

See https://github.com/collective/plone.app.locales/issues/326.

This is a forward port of https://github.com/plone/plone.i18n/pull/37 from 4.x to master.
---
 news/326.feature                |  3 +++
 plone/i18n/locales/languages.py | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 news/326.feature

diff --git a/news/326.feature b/news/326.feature
new file mode 100644
index 0000000..784a46f
--- /dev/null
+++ b/news/326.feature
@@ -0,0 +1,3 @@
+Support Cyrillic and Latin character sets for Serbian.
+See `locales issue 326 <https://github.com/collective/plone.app.locales/issues/326>`_.
+[maurits, fredvd]
diff --git a/plone/i18n/locales/languages.py b/plone/i18n/locales/languages.py
index ea0b7ec..817f5e1 100644
--- a/plone/i18n/locales/languages.py
+++ b/plone/i18n/locales/languages.py
@@ -3,6 +3,8 @@
 from plone.i18n.locales.interfaces import IMetadataLanguageAvailability
 from zope.interface import implementer
 
+import os
+
 
 @implementer(ILanguageAvailability)
 class LanguageAvailability:
@@ -460,6 +462,10 @@ class MetadataLanguageAvailability(LanguageAvailability):
         "flag": "/++resource++country-flags/al.gif",
     },
     "sr": {
+        # Note: we support two character sets for this language.
+        # See zope_i18n_allowed_languages below.
+        # TODO: in Plone 6.0 native should become 'Srpski',
+        # but that requires copying sr@Latn to sr in plone.app.locales.
         "native": "српски",
         "name": "Serbian",
         "flag": "/++resource++country-flags/cs.gif",
@@ -553,6 +559,23 @@ class MetadataLanguageAvailability(LanguageAvailability):
     },
 }
 
+# Character sets are a thing now.
+# See https://github.com/collective/plone.app.locales/issues/326
+# At the moment only for Serbian.
+_zope_i18n_allowed_languages = os.environ.get("zope_i18n_allowed_languages", "")
+if "sr@Latn" in _zope_i18n_allowed_languages:
+    _languagelist["sr"] = {
+        "native": "Srpski",
+        "name": "Serbian (Latin)",
+        "flag": "/++resource++country-flags/cs.gif",
+    }
+elif "sr@Cyrl" in _zope_i18n_allowed_languages:
+    _languagelist["sr"] = {
+        "native": "српски",
+        "name": "Serbian (Cyrillic)",
+        "flag": "/++resource++country-flags/cs.gif",
+    }
+
 # convert the utf-8 encoded values to unicode
 for code in _languagelist:
     value = _languagelist[code]