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use ansi_term::Color;
use std::process::Command;
use super::{Context, Module};
/// Creates a module with the current Rust version
///
/// Will display the Rust version if any of the following criteria are met:
/// - Current directory contains a file with a `.rs` extension
/// - Current directory contains a `Cargo.toml` file
pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
let is_rs_project = context
.new_scan_dir()
.set_files(&["Cargo.toml"])
.set_extensions(&["rs"])
.scan();
if !is_rs_project {
return None;
}
match get_rust_version() {
Some(rust_version) => {
const RUST_CHAR: &str = "🦀 ";
let module_color = Color::Red.bold();
let mut module = context.new_module("rust")?;
module.set_style(module_color);
let formatted_version = format_rustc_version(rust_version);
module.new_segment("symbol", RUST_CHAR);
module.new_segment("version", &formatted_version);
Some(module)
}
None => None,
}
}
fn get_rust_version() -> Option<String> {
match Command::new("rustc").arg("--version").output() {
Ok(output) => Some(String::from_utf8(output.stdout).unwrap()),
Err(_) => None,
}
}
fn format_rustc_version(mut rustc_stdout: String) -> String {
let offset = &rustc_stdout.find('(').unwrap_or_else(|| rustc_stdout.len());
let formatted_version: String = rustc_stdout.drain(..offset).collect();
format!("v{}", formatted_version.replace("rustc", "").trim())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_format_rustc_version() {
let nightly_input = String::from("rustc 1.34.0-nightly (b139669f3 2019-04-10)");
assert_eq!(format_rustc_version(nightly_input), "v1.34.0-nightly");
let beta_input = String::from("rustc 1.34.0-beta.1 (2bc1d406d 2019-04-10)");
assert_eq!(format_rustc_version(beta_input), "v1.34.0-beta.1");
let stable_input = String::from("rustc 1.34.0 (91856ed52 2019-04-10)");
assert_eq!(format_rustc_version(stable_input), "v1.34.0");
let version_without_hash = String::from("rustc 1.34.0");
assert_eq!(format_rustc_version(version_without_hash), "v1.34.0");
}
}
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