feature to run one off computations instead of launching prompt

Author: zahash

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "csc"
-version = "0.1.2"
+version = "0.1.3"
 edition = "2021"
 authors = ["Zahash <zahash.z@gmail.com>"]
 description = "Command Line Scientific Calculator"
@@ -10,6 +10,7 @@ repository = "https://github.com/zahash/csc"
 [dependencies]
 regex = { version = "1" }
 lazy_static = { version = "1" }
+clap = { version = "4", features = ["derive"] }
 rustyline = { version = "12" }
 
 [dev-dependencies]

Cargo.toml

@@ -1,18 +1,31 @@
 <div align="center">
 
-# csc
+<pre>
+ ██████╗███████╗ ██████╗
+██╔════╝██╔════╝██╔════╝
+██║     ███████╗██║     
+██║     ╚════██║██║     
+╚██████╗███████║╚██████╗
+ ╚═════╝╚══════╝ ╚═════╝
+------------------------
+Command Line Scientific Calculator. Free Forever. Made with ❤️ using 🦀
+</pre>
 
 [![Crates.io](https://img.shields.io/crates/v/csc.svg)](https://crates.io/crates/csc)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 </div>
 
-> Command Line Scientific Calculator.
-
 ## Download
 
 [https://github.com/zahash/csc/releases](https://github.com/zahash/csc/releases)
 
+( or )
+
+```
+cargo install csc
+```
+
 ## Usage examples
 
 ```sh
@@ -36,4 +49,3 @@ Distributed under the MIT license. See `LICENSE` for more information.
 3. Commit your changes (`git commit -am 'Add some fooBar'`)
 4. Push to the branch (`git push origin feature/fooBar`)
 5. Create a new Pull Request
-

README.md

@@ -1,16 +1,33 @@
 use crate::eval::*;
 
+use clap::Parser;
 use rustyline::error::ReadlineError;
 
 const LOGO: &'static str = r#"
-███████  ██████ ██      ██████  █████  ██       ██████ 
-██      ██      ██     ██      ██   ██ ██      ██      
-███████ ██      ██     ██      ███████ ██      ██      
-     ██ ██      ██     ██      ██   ██ ██      ██      
-███████  ██████ ██      ██████ ██   ██ ███████  ██████ 
+ ██████ ███████  ██████
+██      ██      ██     
+██      ███████ ██     
+██           ██ ██     
+ ██████ ███████  ██████
 "#;
 
+/// CSC
+#[derive(Parser)]
+struct Cli {
+    /// run one off computations instead of launching the prompt
+    expr: Option<Vec<String>>,
+}
+
 pub fn run() {
+    if let Some(expr) = Cli::parse().expr {
+        let expr = expr.join(" ");
+        match eval(expr.as_str(), &mut State::new()) {
+            Ok(res) => println!("{}", res),
+            Err(e) => eprintln!("{:?}", e),
+        }
+        return;
+    }
+
     println!("{}", LOGO);
     println!(env!("CARGO_PKG_VERSION"));