#!/usr/bin/env python3
#
# This script creates a custom layout, overriding the TDLE key with the first
# argument given.

import argparse
import tempfile
from pathlib import Path
import subprocess
import os
import re
import sys

# Template to force our key to TLDE
template = """
default
xkb_symbols "basic" {{
    include "us(basic)"
    replace key <TLDE> {{ [ {} ] }};
}};
"""

parser = argparse.ArgumentParser(
    description='Tool to verify whether a keysym is resolved'
)
parser.add_argument('keysym', type=str, help='XKB keysym')
parser.add_argument('--tool', type=str, nargs=1,
                    default=['xkbcli', 'compile-keymap'],
                    help='Full path to the xkbcli-compile-keymap tool')
args = parser.parse_args()

with tempfile.TemporaryDirectory() as tmpdir:
    symfile = Path(tmpdir) / "symbols" / "keytest"
    symfile.parent.mkdir()
    with symfile.open(mode='w') as f:
        f.write(template.format(args.keysym))

    try:
        cmd = [
            *args.tool,
            '--layout', 'keytest',
        ]

        env = os.environ.copy()
        env['XKB_CONFIG_EXTRA_PATH'] = tmpdir

        result = subprocess.run(cmd, env=env, capture_output=True,
                                universal_newlines=True)
        if result.returncode != 0:
            print('ERROR: Failed to compile:')
            print(result.stderr)
            sys.exit(1)

        # grep for TLDE actually being remapped
        for l in result.stdout.split('\n'):
            match = re.match(r'\s+key \<TLDE\>\s+{\s+\[\s+(?P<keysym>\w+)\s+\]\s+}', l)
            if match:
                if args.keysym == match.group('keysym'):
                    sys.exit(0)
                elif match.group('keysym') == 'NoSymbol':
                    print('ERROR: key {} not resolved:'.format(args.keysym), l)
                else:
                    print('ERROR: key {} mapped to wrong key:'.format(args.keysym), l)
                sys.exit(1)

        print(result.stdout)
        print('ERROR: above keymap is missing key mapping for {}'.format(args.keysym))
        sys.exit(1)
    except FileNotFoundError as err:
        print('ERROR: invalid or missing tool: {}'.format(err))
        sys.exit(1)