Function read_in_source 

pub fn read_in_source(path: Option<String>) -> String

Read source code from a file at the provided path or from standard input if no path is provided.

Usage

From a file:

use reqlang_expr::cliutil::read_in_source;

let source_code = read_in_source(Some("./spec/valid/call_id.expr".to_string()));

assert_eq!("(id (noop))", source_code);

From stdin:

use reqlang_expr::cliutil::read_in_source;

// Assuming "(id (noop))" was passed to stdin...

let source_code = read_in_source(None);

assert_eq!("(id (noop))".to_string(), source_code);