Update PO template generation to use POTFILES.in

Don't sort template lines (will be problematic when dealing with
multiple source files later on).

po/README.md

@@ -9,23 +9,30 @@ The example commands below show how to create and manage the Japanese
 translations.  Replace all instances of "ja" with the code for the desired
 language.
 
-Creating a new translation
---------------------------
+Create PO template
+------------------
 
-1. Create a .pot file for Diffuse:
+To create or update the PO template (`po/diffuse.pot`), use this command at the
+repo root:
 
-        $ xgettext -s -o diffuse.pot -L Python ../src/usr/bin/diffuse
+    xgettext -o po/diffuse.pot -f po/POTFILES.in
 
-2. Create a .po file for the translation:
+Create a new translation
+------------------------
 
-        $ msginit -l ja -o ja.po -i diffuse.pot
+To create a new translation file, you'll need a PO template. If not already
+created, refer to previous section "Create PO template".
 
-3. Manually complete in the translations in the .po file:
+1. Create a .po file for the translation:
 
-        $ vi ja.po
+        msginit -l ja -o ja.po -i diffuse.pot
 
-Updating an existing translation
---------------------------------
+2. Manually complete in the translations in the .po file:
+
+        vim ja.po
+
+Update a translation
+--------------------
 
 Use `update-translations.py` to update one or more PO files.
 

po/update-translations.py

@@ -26,9 +26,6 @@ import subprocess
 import shutil
 import tempfile
 
-def generate_pot_file():
-    subprocess.run(["xgettext", "-s", "-o", "diffuse.pot", "-L", "Python", "../src/usr/bin/diffuse"])
-
 def check_translation(filename):
     subprocess.run(["msgfmt", "-c", "-v", filename])
 
@@ -61,8 +58,6 @@ parser.add_argument('po_files', metavar='filename.po', nargs='+',
                     help='the translation file')
 parser.add_argument('-c', '--check-only', action='store_true',
                     help='check the PO files')
-parser.add_argument('--no-pot-generation', action='store_true',
-                    help='don\'t generate the POT file')
 
 # Parse command-line arguments
 args = parser.parse_args()
@@ -77,11 +72,6 @@ if args.check_only:
         check_translation(file)
     exit(0)
 
-if not args.no_pot_generation:
-    # Generate diffuse.pot file
-    print("Generate 'diffuse.pot'.")
-    generate_pot_file()
-
 # Create temporary working directory
 tmpdir = tempfile.mkdtemp()
 try: