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use super::Segment;
use crate::context::Context;
use ansi_term::Color;
use std::fs::{self, DirEntry};
use std::process::Command;
/// Creates a segment with the current Rust version
///
/// Will display the Rust version if any of the following criteria are met:
/// - Current directory contains a `.rs` or 'Cargo.toml' file
pub fn segment(context: &Context) -> Option<Segment> {
let files = fs::read_dir(&context.current_dir).unwrap();
let is_rs_project = files.filter_map(Result::ok).any(has_rs_files);
if !is_rs_project {
return None;
}
match get_rust_version() {
Some(rust_version) => {
const RUST_LOGO: &str = "🦀";
const SECTION_COLOR: Color = Color::Red;
let mut segment = Segment::new("rust");
segment.set_style(SECTION_COLOR);
let formatted_version = format_rustc_version(rust_version);
segment.set_value(format!("{} {}", RUST_LOGO, formatted_version));
Some(segment)
}
None => None,
}
}
fn has_rs_files(dir_entry: DirEntry) -> bool {
let is_rs_file = |d: &DirEntry| -> bool {
d.path().is_file() && d.path().extension().unwrap_or_default() == "rs"
};
let is_cargo_toml = |d: &DirEntry| -> bool {
d.path().is_file() && d.path().file_name().unwrap_or_default() == "Cargo.toml"
};
is_rs_file(&dir_entry) || is_cargo_toml(&dir_entry)
}
fn get_rust_version() -> Option<String> {
match Command::new("rustc").arg("-V").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();
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");
}
}
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