rust/rhg/src/commands/config.rs

rhg: Group values passed to every sub-command into a struct

The set of which values this is is evidently not stable yet,
so this will make changes easier. Also it is growing, and the function
signatures are getting out hand.

Differential Revision: https://phab.mercurial-scm.org/D10003

use crate::error::CommandError;
use clap::Arg;
use format_bytes::format_bytes;
use hg::errors::HgError;
use hg::repo::Repo;
use hg::utils::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::App<'static, 'static> {
    clap::SubCommand::with_name("config")
        .arg(
            Arg::with_name("name")
                .help("the section.name to print")
                .value_name("NAME")
                .required(true)
                .takes_value(true),
        )
        .about(HELP_TEXT)
}

pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
    let opt_repo =
        Repo::find_optional(invocation.non_repo_config, invocation.repo_path)?;
    let config = if let Some(repo) = &opt_repo {
        repo.config()
    } else {
        invocation.non_repo_config
    };
    let (section, name) = invocation
        .subcommand_args
        .value_of("name")
        .expect("missing required CLI argument")
        .as_bytes()
        .split_2(b'.')
        .ok_or_else(|| HgError::abort(""))?;

    let value = config.get(section, name).unwrap_or(b"");

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