ksl 0.1.30

KSL core library and interpreter
Documentation 
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//! # ksl::builtin::print
//!
//! Built-in function `Print`.

use crate::{Environment, eval::apply::eval_apply, value::Value};

pub(crate) fn builtin(args: &[Value], env: Environment) -> Result<Value, std::sync::Arc<str>> {
    if let [val] = args {
        match eval_apply(val, env)? {
            Value::String(s) => println!("{s}"),
            o => println!("{o}"),
        }
        Ok(Value::Unit)
    } else if let [val, end] = args {
        match (eval_apply(val, env.clone())?, eval_apply(end, env)?) {
            (v, Value::String(p)) => {
                match v {
                    Value::String(s) => print!("{s}"),
                    o => print!("{o}"),
                }
                print!(
                    "{}",
                    unescaper::unescape(p.as_ref()).map_err(|e| {
                        std::sync::Arc::from(format!(
                            "Error[ksl::builtin::Print]: Failed to unescape `{p}` with `{e}`"
                        ))
                    })?
                );
                console::Term::stdout().flush().map_err(|e| {
                    std::sync::Arc::from(format!(
                        "Error[ksl::builtin::Print]: Failed to flush stdout with `{e}`"
                    ))
                })?;
            }
            (_, e) => {
                return Err(std::sync::Arc::from(format!(
                    "Error[ksl::builtin::Print]: Expected a string as print ending, but got `{e}`."
                )));
            }
        }
        Ok(Value::Unit)
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Print]: ",
                "Expected 1 parameter, but {} were passed."
            ),
            args.len()
        )))
    }
}