Finding files in PATH

find_exe.rs

@@ -0,0 +1,34 @@
+use std::env;
+use std::path::Path;
+use std::path::PathBuf;
+
+fn main() {
+    let args = env::args();
+    if args.len() != 2 {
+        println!("Missing executable name");
+        return;
+    }
+
+    let command = PathBuf::from(&args.last().unwrap());
+    println!("Searching for {:?}...", command);
+
+    if command.exists() {
+        println!("Command is here!");
+        return;
+    }
+
+    println!("Exe is in {:?}", find_in_path(&command));
+}
+
+fn find_in_path(command: &Path) -> Option<PathBuf> {
+    env::split_paths(&env::var_os("PATH")?)
+        .filter_map(|dir| {
+            let full_path = dir.join(&command);
+            if full_path.exists() {
+                Some(full_path)
+            } else {
+                None
+            }
+        })
+        .next()
+}