feat: make msgfmt.py a simple CLI replacement for msgfmt(1)

Simplify testing .po files if the tester doesn't have access to GNU
gettest tools or doesn't want to install the python Babel package.

Also mentioned in developers.txt.

Author: rouilj

CHANGES.txt

@@ -121,7 +121,9 @@ Features:
   document. (John Rouillard)
 - multiple scripts/... updates - Python3, linting, enhancements:
   weekly-report,schema-dump.py, roundup-reminder, copy-user.py,
-  dump_dbm_sessions_db.py, contributors.py (John Rouillard)c
+  dump_dbm_sessions_db.py, contributors.py (John Rouillard)
+- roundup/msgfile.py can now be called as 'python msgfmt.py de.po de.mo'
+  to compile a translation file if msgfmt is missing. (John Rouillard)
 
 
 2023-07-13 2.3.0

doc/developers.txt

@@ -131,7 +131,10 @@ which will compile the ``.po`` source files into binary
 German this will be
 ``locale/locale/de/LC_MESSAGES/roundup.mo``.  You will need
 ``msgfmt`` from the the GNU gettext tools to be installed on
-your system.
+your system. In a pinch you can invoke ``python roundup/msgfmt.py
+po_file mo_file`` to compile your .po file to a .mo file. It's slow
+but seems to work in basic tests. The msgfmt.py file is used by
+Roundup to compile out of date .po files.
 
 Submitting Changes
 ------------------

roundup/msgfmt.py

@@ -282,3 +282,15 @@ def read(self, header_only=False):
 
     def getAsFile(self):
         return BytesIO(self.get())
+
+
+if __name__ == '__main__':
+    # a really dumb attempt to make this into a command
+    # Usage: python msgfmy.py <input_file>.po <output_file>.mo
+    import sys
+    
+    mo = Msgfmt(sys.argv[1]).get()
+    with open(sys.argv[2], 'wb') as mofile:
+        mofile.write(mo)
+        mofile.close()
+