pipa-lang 1.0.0-alpha.1

A tiny template language
Documentation 
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// SPDX-FileCopyrightText: Copyright 2026 olav@occy.org
// SPDX-License-Identifier: MPL-2.0

use crate::lang::adapter::Adapter;
use crate::lang::args::arg_into_string;
use crate::lang::args::eval_unary_arg;
use crate::lang::arity::Arity;
use crate::lang::arity::assert_func_arity;
use crate::lang::error::Error;
use crate::lang::machine::Machine;
use crate::lang::node::Node;
use crate::value::Value;

pub(crate) fn capitalize(
    adapter: &impl Adapter,
    machine: &mut Machine<'_>,
    stdin: Option<&Value>,
    node: Node,
) -> Result<Value, Error> {
    assert_func_arity(adapter, machine, stdin, &node, &Arity::new(1))?;

    let value = eval_unary_arg(adapter, machine, stdin, node)?;
    let value = arg_into_string(value).unwrap_or_default();

    let mut iter = value.chars();
    let iter = iter
        .next()
        .into_iter()
        .flat_map(char::to_uppercase)
        .chain(iter.flat_map(char::to_lowercase));

    Ok(iter.collect::<String>().into())
}