workmn 0.0.5

Manages the lifecycle of projects on the local machine
Documentation 
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use super::{ActionContext, ActionResult, CliAction};
use failure::ResultExt;
use std::fs::File;
use std::io::Write;

pub struct Command {}

impl<'a> CliAction for Command {
    fn dispatch(context: ActionContext) -> ActionResult {
        let shell = context
            .matches
            .value_of("SHELL")
            .expect("shell name enforced by clap");

        let shell = match shell {
            "bash" => clap::Shell::Bash,
            "elvish" => clap::Shell::Elvish,
            "fish" => clap::Shell::Fish,
            "powershell" => clap::Shell::PowerShell,
            "zsh" => clap::Shell::Zsh,
            _ => unreachable!(),
        };

        match context.matches.value_of("file") {
            Some(file) => {
                write_completions(shell, File::create(file).context("Creating completions file")?)
            }
            None => {
                let stdout = std::io::stdout();
                write_completions(shell, stdout.lock())
            }
        }
    }
}

fn write_completions<W>(shell: clap::Shell, mut out: W) -> ActionResult
where
    W: Write,
{
    let app_yaml = load_yaml!("../app.yaml");
    let mut app = clap::App::from(app_yaml);

    app.gen_completions_to(crate_name!(), clap::Shell::Fish, &mut out);
    out.flush()?;

    if let clap::Shell::Fish = shell {
        out.write_all(include_bytes!("completions/extra.fish"))
            .context("Writing extra fish shell completion code")?;
    };

    Ok(())
}