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eta authored
This switches out `arti`'s argument-parsing library with `clap`, which is a lot more featureful (and very widely used within the Rust ecosystem). We also now use a lot of `clap`'s features to improve the CLI experience: - The CLI now expects a subcommand (currently, either "help", or "proxy" for the existing SOCKS proxy behaviour). This should let us add additional non-SOCKS-proxy features to arti in future. - `clap` supports default values determined at runtime, so the way the default config file is loaded was changed: now, we determine the OS-specific path for said file before invoking `clap`, so the help command can show it properly. - The behaviour of `tor_config` was also changed; now, one simply specifies a list of configuration files to load, together with whether they're required. - That function also way overused generics; this has been fixed. - Instead of using the ARTI_LOG environment variable to configure logging, one now uses the `-l, --log-level` CLI option. (The intent is for this option to be more discoverable by users.) - The `proxy` subcommand allows the user to override the SOCKS port used on the CLI without editing the config file.
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