Run clj file as script & evaluate expression

Hardcoding based on arguments.len() == 3 for now Examples: --init/-i for script or --eval/-e for evaluate expression cargo run -- --init examples/hello_world.clj cargo run -- --eval "(println \"eh\")" cargo run -- --eval "(+ 1 2)"

Author: zackteo

examples/hello_world.clj

@@ -0,0 +1,4 @@
+(defn hello-world[]
+ (println "Hello, world"))
+
+(hello-world)

src/main.rs

@@ -23,11 +23,26 @@ mod symbol;
 mod type_tag;
 mod util;
 mod value;
+mod user_action;
 
 fn main() {
- //
- // Start repl
- //
+ let cli_args: user_action::Action = user_action::parse_args();
+
+ // instantiate the core environment
  let repl = repl::Repl::default();
- repl.run();
+ 
+ match cli_args {
+// eval the file/script
+user_action::Action::RunScript(script) => {
+ println!("{:?}", repl::Repl::try_eval_file(&repl, script.as_str()));
+},
+
+// eval the expression
+user_action::Action::Evaluate(expression) => {
+ println!("{:?}", repl::Repl::eval(&repl, &repl::Repl::read_string(&expression)));
+}, 
+
+// Start repl
+user_action::Action::Nothing => { repl.run(); }
+ }
 }

src/user_action.rs

@@ -0,0 +1,34 @@
+use std::env;
+use std::fmt;
+
+pub enum Action{
+ RunScript(String),
+ Evaluate(String),
+ Nothing,
+}
+
+impl fmt::Display for Action {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match &*self {
+ Action::RunScript(filepath) => write!(f, "RunScript"),
+ Action::Evaluate(expression) => write!(f, "Evaluate"),
+ Action::Nothing => write!(f, "Nothing"),
+ }
+ }
+}
+
+pub fn parse_args() -> Action{
+ 
+ let arguments: Vec<String> = env::args().collect();
+
+ if arguments.len() == 3 {
+if arguments[1] == "-i" || arguments[1] == "--init" {
+ return Action::RunScript(arguments[2].clone());
+}else if arguments[1] == "-e" || arguments[1] == "--eval" {
+ return Action::Evaluate(arguments[2].clone());
+}else { return Action::Nothing; }
+ }else {
+return Action::Nothing;
+ } 
+}
+