From 2b416b6b2f97154e5300388798c5433a29fef331 Mon Sep 17 00:00:00 2001
From: Valerie Wolfe <sleeplessval@gmail.com>
Date: Fri, 12 Jul 2024 14:05:01 -0400
Subject: [PATCH] dos-var: initial implementation

---
 dos-var/.gitignore   |  2 ++
 dos-var/Cargo.toml   |  6 ++++++
 dos-var/src/error.rs | 13 +++++++++++++
 dos-var/src/main.rs  | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 dos-var/.gitignore
 create mode 100644 dos-var/Cargo.toml
 create mode 100644 dos-var/src/error.rs
 create mode 100644 dos-var/src/main.rs

diff --git a/dos-var/.gitignore b/dos-var/.gitignore
new file mode 100644
index 0000000..96ef6c0
--- /dev/null
+++ b/dos-var/.gitignore
@@ -0,0 +1,2 @@
+/target
+Cargo.lock
diff --git a/dos-var/Cargo.toml b/dos-var/Cargo.toml
new file mode 100644
index 0000000..5307eea
--- /dev/null
+++ b/dos-var/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "dos-var"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
diff --git a/dos-var/src/error.rs b/dos-var/src/error.rs
new file mode 100644
index 0000000..a7fa008
--- /dev/null
+++ b/dos-var/src/error.rs
@@ -0,0 +1,13 @@
+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);
+}
+
diff --git a/dos-var/src/main.rs b/dos-var/src/main.rs
new file mode 100644
index 0000000..9f4498d
--- /dev/null
+++ b/dos-var/src/main.rs
@@ -0,0 +1,37 @@
+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}");
+		}
+	}
+}
+