onpath 0.2.0

Get your tools on the PATH — cross-shell, cross-platform, zero fuss
Documentation 
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use std::path::{Path, PathBuf};

use crate::config::Position;
use crate::context::SystemContext;
use crate::shell::{Shell, ShellKind};

pub struct Nushell;

impl Shell for Nushell {
    fn kind(&self) -> ShellKind {
        ShellKind::Nushell
    }

    fn env_extension(&self) -> &'static str {
        ".nu"
    }

    fn env_script(&self, dir: &Path, position: Position) -> String {
        let dir = dir.display();
        let mutation = match position {
            Position::Prepend => format!("$env.PATH = ($env.PATH | prepend \"{dir}\")"),
            Position::Append => format!("$env.PATH = ($env.PATH | append \"{dir}\")"),
        };
        format!(
            r#"# Generated by onpath. Do not edit.
if not ($env.PATH | split row (char esep) | any {{|p| $p == "{dir}"}}) {{
    {mutation}
}}
"#
        )
    }

    fn source_line(&self, env_script_path: &Path) -> String {
        format!("source \"{}\"", env_script_path.display())
    }

    fn rc_candidates(&self, ctx: &SystemContext) -> Vec<PathBuf> {
        let config = ctx.xdg_config_home();
        vec![
            config.join("nushell").join("env.nu"),
            config.join("nushell").join("config.nu"),
        ]
    }

    fn primary_rc(&self, ctx: &SystemContext) -> PathBuf {
        ctx.xdg_config_home().join("nushell").join("env.nu")
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn env_script_uses_nushell_syntax() {
        let script = Nushell.env_script(Path::new("/app/bin"), Position::Prepend);
        assert!(script.contains("$env.PATH"));
        assert!(script.contains("split row (char esep)"));
        assert!(script.contains("prepend"));
    }

    #[test]
    fn env_script_append() {
        let script = Nushell.env_script(Path::new("/app/bin"), Position::Append);
        assert!(script.contains("append"));
    }

    #[test]
    fn primary_rc_is_env_nu() {
        let ctx = SystemContext::with_home(PathBuf::from("/home/user"));
        assert_eq!(
            Nushell.primary_rc(&ctx),
            PathBuf::from("/home/user/.config/nushell/env.nu")
        );
    }
}