compatibility check caching

src/compatibility.rs

@@ -0,0 +1,50 @@
+use std::process::Command;
+use std::{fs::File, path::Path};
+
+pub fn check_compatibility(linker: String) {
+    let result = check_compatibility_impl(linker);
+    if result.is_err() {
+        println!("Error: {}", result.unwrap_err());
+        // maybe exit here?
+    }
+}
+
+fn check_compatibility_impl(linker: String) -> std::io::Result<()> {
+    if !Path::new(".tkcache").exists() {
+        initial_compat_check(linker);
+        let _ = File::create(".tkcache")?;
+    }
+    Ok(())
+}
+
+fn initial_compat_check(linker: String) {
+    if cfg!(windows) {
+        if Command::new("bash").arg("--version").output().is_err() {
+            println!("Error: WSL installation not found. Please install WSL and try again.");
+            std::process::exit(1)
+        }
+    }
+
+    if get_os_command().arg("-c").arg("nasm").output().is_err() {
+        println!("Error: NASM installation not found.");
+        std::process::exit(1)
+    }
+
+    if get_os_command()
+        .arg("-c")
+        .arg(format!("{linker}"))
+        .output()
+        .is_err()
+    {
+        println!("Error: {linker} installation not found.");
+        std::process::exit(1)
+    }
+}
+
+fn get_os_command() -> Command {
+    return if cfg!(windows) {
+        Command::new("bash")
+    } else {
+        Command::new("sh")
+    };
+}

src/lib.rs

@@ -1,4 +1,5 @@
 pub mod checker;
+pub mod compatibility;
 pub mod compiler;
 pub mod graph;
 pub mod lexer;

src/main.rs

@@ -1,6 +1,7 @@
 use path_slash::PathBufExt;
-use std::{path::PathBuf, process::Command};
+use std::path::PathBuf;
 
+use tack::compatibility::check_compatibility;
 use tack::run::{invoke_command, run};
 
 fn print_help_and_exit() -> ! {
@@ -20,15 +21,8 @@ Options:
 	std::process::exit(1);
 }
 
-fn check_compatibility() {
-	if cfg!(windows) && Command::new("bash").arg("--version").output().is_err() {
-		println!("Error: WSL installation not found. Please install WSL and try again.");
-		std::process::exit(1)
-	}
-}
-
 fn main() {
-	check_compatibility();
+	check_compatibility("ld".to_string());
 
 	let input = match std::env::args().nth(1) {
 		Some(value) => {