Function detect_language 

pub fn detect_language(dir: &Path) -> Language

根据目录下的标志文件推测编程语言。

use std::path::Path;
use quanttide_devops::source::config_file::detect_language;

let lang = detect_language(Path::new("/tmp/nonexistent"));
assert!(matches!(lang, quanttide_devops::contract::Language::Unknown(_)));