Adding syntax colouring for PO files.

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4709 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

 2014-04-03  Benno Schulenberg  <bensberg@justemail.net>
 	* configure.ac: Remove unused '*_support' variables.
+	* doc/syntax/po.nanorc: New file, syntax colouring for PO files.
 
 2014-04-02  Benno Schulenberg  <bensberg@justemail.net>
 	* configure.ac, doc/Makefile.am: Try to build the info documentation

doc/syntax/po.nanorc

+## Syntax colouring for PO files.
+##
+syntax "po" "\.pot?$"
+# Comments.
+color green "^#.*$"
+color yellow "Copyright|\(C\)"
+# Header fields.
+color brightmagenta "\<(Project\-Id\-Version|Report\-Msgid\-Bugs\-To|Last\-Translator|Language\-Team|Language|X\-Generator|Plural\-Forms)\>"
+color cyan "\<(POT\-Creation\-Date|PO\-Revision\-Date|MIME\-Version|Content\-Type|Content\-Transfer\-Encoding)\>"
+# Encodings and numbers.
+color yellow "\<(UTF|ISO|Windows|Mac|IBM)\>\-[0-9]"
+color yellow "[0-9]|pre[0-9]|[0-9]bit"
+# Msgids.
+color brightblue "\<(msgid|msgid_plural|msgstr)\>"
+# Tags.
+color red "\<fuzzy\>"
+color yellow "\<c-format\>"
+# Format specifiers.
+color brightmagenta "%([1-9]\$)?[a-z]*"
+# Quotes and newlines.
+color yellow "\""
+color cyan "\\n"
+# Obsolete strings.
+color red "#~.*$"