BREAKING: use environments to get informations

src/args.rs

@@ -0,0 +1,38 @@
+pub fn handle_args() {
+	let args = std::env::args().collect::<Vec<String>>();
+	if args.len() > 1 {
+		let shell = &args[1];
+		let binary_path = &args[0];
+		let last_command;
+		let alias;
+
+		match shell.as_str() {
+			"bash" => {
+				last_command = "$(history 2)";
+				alias = "$(alias)"
+			}
+			"zsh" => {
+				last_command = "$(fc -ln -1)";
+				alias = "$(alias)"
+			}
+			"fish" => {
+				last_command = "$(history | head -n 1)";
+				alias = "$(alias)";
+			}
+			_ => {
+				println!("Unknown shell: {}", shell);
+				std::process::exit(1);
+			}
+		}
+
+		println!(
+			"\
+			_PR_LAST_COMMAND=\"{}\" \
+			_PR_ALIAS=\"{}\" \
+			_PR_SHELL=\"{}\" \
+			\"{}\"",
+			last_command, alias, shell, binary_path
+		);
+		std::process::exit(0);
+	}
+}