phetch/src/main.rs

use phetch::{
    args, gopher, menu,
    ui::{Mode, UI},
};
use std::{env, error::Error, io, process};

fn main() {
    if let Err(e) = run() {
        eprintln!("{}", e);
        process::exit(1);
    }
}

/// Start the app. Returns UNIX exit code.
fn run() -> Result<(), Box<dyn Error>> {
    let str_args = env::args().skip(1).collect::<Vec<String>>();
    let mut cfg = args::parse(&str_args)?;

    // check for simple modes
    match cfg.mode {
        Mode::Raw => return print_raw(&cfg.start, cfg.tls, cfg.tor),
        Mode::Version => return print_version(),
        Mode::Help => return print_usage(),
        Mode::NoTTY => return print_plain(&cfg.start, cfg.tls, cfg.tor),
        Mode::Print => cfg.wide = true,
        Mode::Run => {}
    }

    // load url
    let start = cfg.start.clone();
    let mode = cfg.mode;
    let mut ui = UI::new(cfg);
    ui.open(&start, &start)?;

    // print rendered version
    if mode == Mode::Print {
        println!("{}", ui.render()?);
        return Ok(());
    }

    // run app
    ui.run()?;

    Ok(())
}

/// --version
fn print_version() -> Result<(), Box<dyn Error>> {
    println!(
        "phetch v{version} ({built})",
        built = phetch::BUILD_DATE,
        version = phetch::VERSION
    );
    Ok(())
}

/// --help
fn print_usage() -> Result<(), Box<dyn Error>> {
    print_version()?;
    println!(
        "
Usage:

    phetch [options]       Launch phetch in interactive mode
    phetch [options] url   Open Gopher URL in interactive mode

Options:

    -s, --tls              Try to open Gopher URLs securely w/ TLS
    -o, --tor              Use local Tor proxy to open all pages
    -S, -O                 Disable TLS or Tor

    -r, --raw              Print raw Gopher response only
    -p, --print            Print rendered Gopher response only
    -l, --local            Connect to 127.0.0.1:7070

    -c, --config FILE      Use instead of ~/.config/phetch/phetch.conf
    -C, --no-config        Don't use any config file

    -h, --help             Show this screen
    -v, --version          Show phetch version

Command line options always override options set in phetch.conf.

Once you've launched phetch, use `ctrl-h` to view the on-line help."
    );
    Ok(())
}

/// Print just the raw Gopher response.
fn print_raw(url: &str, tls: bool, tor: bool) -> Result<(), Box<dyn Error>> {
    let (_, out) = gopher::fetch_url(url, tls, tor)?;
    println!("{}", out);
    Ok(())
}

/// Print a colorless, plain version of the response for a non-tty
/// (like a pipe).
fn print_plain(url: &str, tls: bool, tor: bool) -> Result<(), Box<dyn Error>> {
    let mut out = String::new();
    let typ = gopher::type_for_url(url);
    let (_, response) = gopher::fetch_url(url, tls, tor)?;
    match typ {
        gopher::Type::Menu => {
            let menu = menu::parse(url, response);
            for line in menu.lines {
                out.push_str(line.text(&menu.raw));
                out.push('\n');
            }
        }
        gopher::Type::Text => println!("{}", response.trim_end_matches(".\r\n")),
        _ => {
            return Err(Box::new(io::Error::new(
                io::ErrorKind::Other,
                format!("can't print gopher type: {:?}", typ),
            )));
        }
    };
    print!("{}", out);
    Ok(())
}