hen 0.8.0

Run API collections from the command line.
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use std::path::PathBuf;

use pest::Parser;
use pest_derive::Parser;

#[derive(Parser)]
#[grammar = "src/parser/preprocessor.pest"]
struct PreprocessorParser;

pub fn preprocess(input: &str, working_dir: PathBuf) -> Result<String, pest::error::Error<Rule>> {
    // let mut output = String::new();
    let mut lines: Vec<String> = vec![];

    let mut pairs = PreprocessorParser::parse(Rule::body, input)?;

    let pair = pairs.next().unwrap();

    for inner_pair in pair.into_inner() {
        match inner_pair.as_rule() {
            Rule::line => {
                lines.push(inner_pair.as_str().trim().to_string());
            }
            Rule::import_target => {
                let arg = inner_pair.as_str().trim();
                lines.push(resolve_import(arg, &working_dir)?);
            }
            _ => {
                unreachable!("unexpected rule: {:?}", inner_pair.as_rule());
            }
        }
    }

    Ok(lines.join("\n"))
}

fn resolve_import(path: &str, working_dir: &PathBuf) -> Result<String, pest::error::Error<Rule>> {
    let path = working_dir.join(path);
    let path = PathBuf::from(path);
    let file_content = std::fs::read_to_string(path).expect("failed to read import");
    // preprocess the imported file
    preprocess(&file_content, working_dir.clone())
}