scripts/i18n: also normalize casing of UTF-8 in Content-Type

f626260a376c introduced invariant msgmerge casing. Do the same when normalizing
to ensure consistency also without msgmerge and to avoid unnecessary conflicts.

scripts/i18n_utils.py

@@ -1,188 +1,191 b''
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import print_function
 
 import os
 import re
 import shutil
 import subprocess
 import tempfile
 
 
 do_debug = False  # set from scripts/i18n --debug
 
 def debug(*args, **kwargs):
     if do_debug:
         print(*args, **kwargs)
 
 def runcmd(cmd, *args, **kwargs):
     debug('... Executing command: %s' % ' '.join(cmd))
     subprocess.check_call(cmd, *args, **kwargs)
 
 header_comment_strip_re = re.compile(r'''
     ^
     [#][ ]Translations[ ]template[ ]for[ ]Kallithea[.] \n
     |
     ^
     [#][ ]FIRST[ ]AUTHOR[ ]<EMAIL@ADDRESS>,[ ]\d+[.] \n
     [#] \n
     [#],[ ]fuzzy \n
     ''',
     re.MULTILINE|re.VERBOSE)
 
 header_normalize_re = re.compile(r'''
     ^ "
     (POT-Creation-Date|PO-Revision-Date|Last-Translator|Language-Team|X-Generator|Generated-By|Project-Id-Version):
     [ ][^\\]*\\n
     " \n
     ''',
     re.MULTILINE|re.IGNORECASE|re.VERBOSE)
 
 def _normalize_po(raw_content):
     r"""
     >>> print(_normalize_po(r'''
     ... # header comment
     ...
     ...
     ... # comment before header
     ... msgid ""
     ... msgstr "yada"
     ... "POT-Creation-Date: 2019-05-04 21:13+0200\n"
     ... "MIME-Version: "
     ... "1.0\n"
     ... "Last-Translator: Jabba"
     ... "the Hutt\n"
     ... "X-Generator: Weblate 1.2.3\n"
     ...
     ... # comment, but not in header
     ... msgid "None"
     ... msgstr "Ingen"
     ...
     ...
     ... line 2
     ... # third comment
     ...
     ... msgid "Special"
     ... msgstr ""
     ...
     ... msgid "Specialist"
     ... # odd comment
     ... msgstr ""
     ... "Expert"
     ...
     ... # crazy fuzzy auto translation by msgmerge, using foo for bar
     ... #, fuzzy
     ... #| msgid "some foo string"
     ... msgid "some bar string."
     ... msgstr "translation of foo string"
     ...
     ... msgid "%d minute"
     ... msgid_plural "%d minutes"
     ... msgstr[0] "minut"
     ... msgstr[1] "minutter"
     ... msgstr[2] ""
     ...
     ... msgid "%d year"
     ... msgid_plural "%d years"
     ... msgstr[0] ""
     ... msgstr[1] ""
     ...
     ... # last comment
     ... ''') + '^^^')
     # header comment
     <BLANKLINE>
     <BLANKLINE>
     # comment before header
     <BLANKLINE>
     msgid ""
     msgstr "yada"
     "MIME-Version: "
     "1.0\n"
     <BLANKLINE>
     msgid "None"
     msgstr "Ingen"
     <BLANKLINE>
     line 2
     <BLANKLINE>
     msgid "Specialist"
     msgstr ""
     "Expert"
     <BLANKLINE>
     msgid "%d minute"
     msgid_plural "%d minutes"
     msgstr[0] "minut"
     msgstr[1] "minutter"
     msgstr[2] ""
     ^^^
     """
     header_start = raw_content.find('\nmsgid ""\n') + 1
     header_end = raw_content.find('\n\n', header_start) + 1 or len(raw_content)
     chunks = [
         header_comment_strip_re.sub('', raw_content[0:header_start])
             .strip(),
         '',
         header_normalize_re.sub('', raw_content[header_start:header_end])
+            .replace(
+                r'"Content-Type: text/plain; charset=utf-8\n"',
+                r'"Content-Type: text/plain; charset=UTF-8\n"')  # maintain msgmerge casing
             .strip(),
         '']  # preserve normalized header
     # all chunks are separated by empty line
     for raw_chunk in raw_content[header_end:].split('\n\n'):
         if '\n#, fuzzy' in raw_chunk:  # might be like "#, fuzzy, python-format"
             continue  # drop crazy auto translation that is worse than useless
         # strip all comment lines from chunk
         chunk_lines = [
             line
             for line in raw_chunk.splitlines()
             if line
             and not line.startswith('#')
         ]
         if not chunk_lines:
             continue
         # check lines starting from first msgstr, skip chunk if no translation lines
         msgstr_i = [i for i, line in enumerate(chunk_lines) if line.startswith('msgstr')]
         if (
             chunk_lines[0].startswith('msgid') and
             msgstr_i and
             all(line.endswith(' ""') for line in chunk_lines[msgstr_i[0]:])
         ):  # skip translation chunks that doesn't have any actual translations
             continue
         chunks.append('\n'.join(chunk_lines) + '\n')
     return '\n'.join(chunks)
 
 def _normalize_po_file(po_file, merge_pot_file=None, strip=False):
     if merge_pot_file:
         runcmd(['msgmerge', '--width=76', '--backup=none', '--previous',
                 '--update', po_file, '-q', merge_pot_file])
     if strip:
         po_tmp = po_file + '.tmp'
         with open(po_file, 'r') as src, open(po_tmp, 'w') as dest:
             raw_content = src.read()
             normalized_content = _normalize_po(raw_content)
             dest.write(normalized_content)
         os.rename(po_tmp, po_file)
 
 def _normalized_diff(file1, file2, merge_pot_file=None, strip=False):
     # Create temporary copies of both files
     temp1 = tempfile.NamedTemporaryFile(prefix=os.path.basename(file1))
     temp2 = tempfile.NamedTemporaryFile(prefix=os.path.basename(file2))
     debug('normalized_diff: %s -> %s / %s -> %s' % (file1, temp1.name, file2, temp2.name))
     shutil.copyfile(file1, temp1.name)
     shutil.copyfile(file2, temp2.name)
     # Normalize them in place
     _normalize_po_file(temp1.name, merge_pot_file=merge_pot_file, strip=strip)
     _normalize_po_file(temp2.name, merge_pot_file=merge_pot_file, strip=strip)
     # Now compare
     try:
         runcmd(['diff', '-u', temp1.name, temp2.name])
     except subprocess.CalledProcessError as e:
         return e.returncode