dos-var: initial implementation

dos-var/.gitignore

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+/target
+Cargo.lock

dos-var/Cargo.toml

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+[package]
+name = "dos-var"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]

dos-var/src/error.rs

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+use std::process::exit;
+
+pub fn not_found(target: &String) {
+	eprintln!("dos-var: %{target}% has no value");
+	exit(1);
+}
+
+
+pub fn arg_count() {
+	eprintln!("dos-var: expects one argument");
+	exit(2);
+}
+

dos-var/src/main.rs

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+use std::{
+	env::args,
+	process::{
+		Command,
+		Stdio
+	}
+};
+
+mod error;
+
+const CMD: &str = "/mnt/c/Windows/System32/cmd.exe";
+
+pub fn main() {
+	let args: Vec<String> = args().collect();
+	if args.len() != 2 { error::arg_count(); }
+	let target = &args[1];
+
+	let cmd = Command::new(CMD)
+		.current_dir("/mnt/c/")
+		.arg( format!("/C echo %{target}%") )
+		.output();
+	if let Ok(output) = cmd {
+		if let Ok(stdout) = String::from_utf8(output.stdout) {
+			//	trim output
+			let stdout = stdout.trim_end_matches("\"\r\n");
+			//	catch empty variable case
+			if stdout == format!("%{target}%") { error::not_found(&target); }
+
+			//	convert and write
+			let path = stdout
+				.replace("\\", "/")
+				.replace("C:/", "/mnt/c/");
+			println!("{path}");
+		}
+	}
+}
+