New "12_locale" core plugin

Setup and validate locale(7) settings.

diff --git a/core/12_locale/12_locale.zprofile b/core/12_locale/12_locale.zprofile
new file mode 100644 (file)
index 0000000..04d8a2a
--- /dev/null
+++ b/core/12_locale/12_locale.zprofile
@@ -0,0 +1,39 @@
+# AX-ZSH: Alex' Modular ZSH Configuration
+# 12_locale.zprofile: Initialize locale settings
+
+# This is only relevant for interactive shells (because the user has to
+# manually enter data when the validation fails):
+[[ -z "$PS1" ]] && return 0
+
+# Validate the locale(7) settings in interactive shells and try to mimic the
+# tset(1) behaviour.
+while true; do
+       lc_messages=$(locale 2>/dev/null | fgrep LC_MESSAGES | cut -d'=' -f2)
+       lc_messages=$lc_messages:gs/\"//
+       locale=$lc_messages:r
+       encoding=$lc_messages:e:l:gs/-//
+       [[ -n "$encoding" ]] && locale="$locale.$encoding"
+       [[ -z "$LANG$LANGUAGE$LC_ALL$LC_MESSAGES" ]] && unset lc_messages
+
+       if [[ -n "$LANG$LANGUAGE$LC_ALL$LC_MESSAGES" ]] && locale -a 2>/dev/null | grep "^$locale\$" >/dev/null; then
+               # The locale setting seems to be valid: one of the LANG,
+               # LANGUAGE, LC_ALL and/or LC_MESSAGES is set and the locale is
+               # included in "locale -a" output. Good!
+               break
+       fi
+
+       echo "ax-zsh: unknown/unsupported locale ${lc_messages:-unknown}" >&2
+       unset locale
+       while [[ -z "$locale" ]]; do
+               if ! read "locale?Locale? "; then
+                       echo >&2
+                       break 2
+               fi
+       done
+       if [[ -n "$locale" ]]; then
+               export LANG=$locale
+               unset LANGUAGE LC_ALL LC_MESSAGES
+       fi
+done
+
+unset lc_messages locale encoding