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# SPDX-FileCopyrightText: Peter Pentchev <roam@ringlet.net>
# SPDX-License-Identifier: BSD-2-Clause
"""The u8loc command-line tool."""
from __future__ import annotations
import argparse
import dataclasses
import os
import subprocess
import sys
import typing
from . import detect
if typing.TYPE_CHECKING:
from collections.abc import Callable
@dataclasses.dataclass(frozen=True)
class Config:
"""Runtime configuration for the u8loc command-line tool."""
preferred: bool
@dataclasses.dataclass(frozen=True)
class QueryConfig(Config):
"""Runtime configuration for `u8loc -q variable`."""
query: str
@dataclasses.dataclass(frozen=True)
class RunConfig(Config):
"""Runtime configuration for `u8loc -r program [arg...]`."""
run_program: list[str]
@dataclasses.dataclass(frozen=True, order=True)
class QueryDef:
"""A parameter for the -q option."""
name: str
early: bool
handler: Callable[[QueryConfig, detect.UTF8Environment], None]
descr: str
def query_env(cfg: QueryConfig, env: detect.UTF8Environment) -> None:
"""Output the value of an environment variable."""
value = env.env_vars.get(cfg.query)
if value is None:
sys.exit(f"Internal error: query_env(): no value for {cfg.query!r} in {env.env_vars!r}")
print(value)
def query_list(_cfg: QueryConfig, _env: detect.UTF8Environment) -> None:
"""List the available query options."""
for qdef in sorted(QUERY_HANDLERS_LIST):
print(f"{qdef.name:20s} - {qdef.descr}")
def query_preferred(_cfg: QueryConfig, _env: detect.UTF8Environment) -> None:
"""Display the list of preferred languages as per the locale variables."""
print("\n".join(detect.LanguagesDetect().detect()))
QUERY_HANDLERS_LIST = [
QueryDef(
name="LC_ALL",
early=False,
handler=query_env,
descr="The LC_ALL environment variable",
),
QueryDef(
name="LANGUAGE",
early=False,
handler=query_env,
descr="The LANGUAGE environment variable",
),
QueryDef(
name="list",
early=True,
handler=query_list,
descr="List the available query parameters",
),
QueryDef(
name="preferred",
early=True,
handler=query_preferred,
descr="List the preferred languages as per the locale variables",
),
]
QUERY_HANDLERS = {qdef.name: qdef for qdef in QUERY_HANDLERS_LIST}
def parse_args() -> Config:
"""Parse the u8loc tool's command-line options."""
parser = argparse.ArgumentParser(prog="u8loc")
parser.add_argument(
"-p",
dest="preferred",
action="store_true",
help="use a locale specified in the LANG and LC_* variables if appropriate",
)
parser.add_argument(
"-q",
dest="query",
type=str,
choices=sorted(QUERY_HANDLERS.keys()),
help="output the value of an environment variable",
)
parser.add_argument(
"-r",
dest="run",
action="store_true",
help="run the specified program in a UTF-8-friendly environment",
)
parser.add_argument(
"--features",
action="store_true",
help="display the features supported by the program and exit",
)
parser.add_argument(
"program",
type=str,
nargs="*",
help="the program to run if -r is specified",
)
args = parser.parse_args()
if args.features:
print(f"Features: u8loc={detect.VERSION} query-env=0.1 query-preferred=0.1 run=0.1")
sys.exit(0)
if int(args.query is not None) + int(args.run) != 1:
sys.exit("Exactly one of -q or -r must be specified.")
if args.query:
return QueryConfig(preferred=args.preferred, query=args.query)
if args.run:
if not args.program:
sys.exit("No program to run specified")
return RunConfig(preferred=args.preferred, run_program=args.program)
sys.exit(f"Did not expect to reach the end of parse_args() with {args!r}")
def main() -> None:
"""Parse command-line arguments, dispatch commands."""
cfg = parse_args()
if isinstance(cfg, QueryConfig) and QUERY_HANDLERS[cfg.query].early:
QUERY_HANDLERS[cfg.query].handler(
cfg,
detect.UTF8Environment(env={}, env_vars={}, locale="", languages=[]),
)
return
try:
languages = (
detect.LanguagesDetect().detect() if cfg.preferred else list(detect.UTF8_LANGUAGES)
)
env = detect.UTF8Detect(languages=iter(languages)).detect()
if env.languages != languages:
sys.exit(f"utf8-locale internal error: env {env.languages!r} != {languages!r}")
except (detect.NoLanguagesError, OSError, subprocess.CalledProcessError) as err:
sys.exit(f"Could not determine an appropriate UTF-8 locale: {err}")
if isinstance(cfg, RunConfig):
try:
os.execvpe(cfg.run_program[0], cfg.run_program, env.env)
except OSError as err:
sys.exit(f"Could not run '{' '.join(cfg.run_program)}': {err}")
if isinstance(cfg, QueryConfig):
QUERY_HANDLERS[cfg.query].handler(cfg, env)
return
sys.exit(f"Did not expect to reach the end of main() with {cfg!r}")
if __name__ == "__main__":
main()
|
