use crate::error::CommandError;

use clap::Arg;

use format_bytes::format_bytes;

use hg::errors::HgError;

use hg::utils::strings::SliceExt;

pub const HELP_TEXT: &str = "

With one argument of the form section.name, print just the value of that config item.

";

pub fn args() -> clap::Command {

    clap::command!("config")

        .arg(

            Arg::new("name")

                .help("the section.name to print")

                .value_name("NAME")

                .required(true),

        )

        .about(HELP_TEXT)

}

pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {

    let (section, name) = invocation

        .subcommand_args

        .get_one::<String>("name")

        .expect("missing required CLI argument")

        .as_bytes()

        .split_2(b'.')

        .ok_or_else(|| HgError::unsupported("hg config <section>"))?;

    if let Some(value) = invocation.config.get(section, name) {

        invocation.ui.write_stdout(&format_bytes!(b"{}\n", value))?;

        Ok(())

    } else {

        Err(CommandError::Unsuccessful)

    }

}