parallelize locale compilation (#21889)

locale/compile-mo.sh

@@ -5,6 +5,19 @@
 # Make this script fail if any command exits wit exit code != 0
 set -e
 
+function process_po_file() {
+    pofile=$1
+    dir=$(dirname "$pofile")
+    lang=$(echo "$pofile" | cut -d "/" -f2)
+    stem=$(basename "$pofile" .po)
+    touch "${dir}/${stem}.mo"
+    dennis-cmd lint --errorsonly "$pofile" && msgfmt -o "${dir}/${stem}.mo" "$pofile"
+}
+
+# We are spawning sub processes with `xargs`
+# and the function needs to be available in that sub process
+export -f process_po_file
+
 function usage() {
     echo "syntax:"
     echo "compile-mo.sh locale-dir/"
@@ -17,34 +30,7 @@ if [[ ($# -ne 1) || (! -d "$1") ]]; then usage; fi
 hash dennis-cmd 2>/dev/null || source $VENV/bin/activate
 
 echo "compiling django.po..."
-for pofile in `find $1 -type f -name "django.po"`; do
-    dir=`dirname $pofile`
-    lang=`echo $pofile | cut -d "/" -f2`
-    stem=`basename $pofile .po`
-    # lint the .po file
-    dennis-cmd lint --errorsonly "$pofile"
+find $1 -type f -name "django.po" -print0 | xargs -0 -n1 -P4 bash -c 'process_po_file "$@"' _
 
-    if [ $? -ne 0 ]
-    then
-        exit 1
-    else
-        msgfmt -o ${dir}/${stem}.mo $pofile
-    fi
-done
-
-echo
 echo "compiling djangojs.po..."
-for pofile in `find $1 -type f -name "djangojs.po"`; do
-    dir=`dirname $pofile`
-    lang=`echo $pofile | cut -d "/" -f2`
-    stem=`basename $pofile .po`
-    touch "${dir}/${stem}.mo"
-    # lint the .po file
-    dennis-cmd lint --errorsonly "$pofile"
-    if [ $? -ne 0 ]
-    then
-        exit 1
-    else
-        msgfmt -o ${dir}/${stem}.mo $pofile
-    fi
-done
+find $1 -type f -name "djangojs.po" -print0 | xargs -0 -n1 -P4 bash -c 'process_po_file "$@"' _