rust/rhg/src/commands/root.rs

rhg: Move `Repo` object creation into `main()`

… rather than in each sub-command that needs a local repository.

This will allow accessing e.g. `.hg/blackbox.log` before dispatching
to sub-commands.

Differential Revision: https://phab.mercurial-scm.org/D10004

use crate::error::CommandError;
use format_bytes::format_bytes;
use hg::utils::files::get_bytes_from_path;

pub const HELP_TEXT: &str = "
Print the root directory of the current repository.

Returns 0 on success.
";

pub fn args() -> clap::App<'static, 'static> {
    clap::SubCommand::with_name("root").about(HELP_TEXT)
}

pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
    let repo = invocation.repo?;
    let bytes = get_bytes_from_path(repo.working_directory_path());
    invocation
        .ui
        .write_stdout(&format_bytes!(b"{}\n", bytes.as_slice()))?;
    Ok(())
}