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#[cfg(feature = "serde")] use serde::{Deserialize, Serialize}; use std::{fmt::Display, str::FromStr}; #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] #[derive(Debug, Clone, Copy)] pub enum ToolChain { Stable, Beta, Nightly, } impl FromStr for ToolChain { type Err = Box<dyn std::error::Error>; fn from_str(s: &str) -> std::result::Result<Self, Self::Err> { use ToolChain::*; match s.to_lowercase().as_str() { "stable" => Ok(Stable), "beta" => Ok(Beta), "nightly" => Ok(Nightly), _ => Err("Unknown toolchain".into()), } } } impl ToolChain { pub(crate) fn as_arg(&self) -> String { use ToolChain::*; match self { Stable => "+stable".to_string(), Beta => "+beta".to_string(), Nightly => "+nightly".to_string(), } } } impl Display for ToolChain { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { use ToolChain::*; match self { Stable => write!(f, "stable"), Beta => write!(f, "beta"), Nightly => write!(f, "nightly"), } } }