auric 0.1.3

CLI for the Ember-inspired Auric SPA framework
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use clap::Parser;
use handlebars::Handlebars;
use pluralizer::pluralize;
use std::collections::HashMap;
use std::fs::{self, File};
use std::io::Write;
use std::path::{Path, PathBuf};
use syn::{Item, ItemMod};

const ADAPTER_RS_HBS: &str = include_str!("../../../assets/src/adapter.rs.hbs");

#[derive(Debug, Parser)]
pub struct Opts {
    /// Adapter Name
    #[arg(value_name = "name")]
    pub name: String,
}

pub async fn run(name: String) -> anyhow::Result<()> {
    // Generate adapter module
    let mut handlebars = Handlebars::default();
    const NAME: &str = "default";
    handlebars.register_template_string(NAME, ADAPTER_RS_HBS)?;
    let data = HashMap::from([
        ("collection", pluralize(&name, 2, false).clone()),
        ("name", name.clone()),
        ("structName", struct_name(&name)),
    ]);
    let contents = handlebars.render(NAME, &data)?;

    // Deploy the adapter module file
    let adapters_dir = PathBuf::new().join("src").join("adapters");
    let (modulename, filename, dir) = {
        let s = change_case::snake_case(&name).replace("_", "/");
        let filename = format!("{s}.rs");
        let modulename = match s.rfind("/") {
            None => s,
            Some(n) => s[n + 1..].to_owned(),
        };
        let dir = adapters_dir.join(&filename).parent().unwrap().to_owned();
        (modulename, filename, dir)
    };
    fs::create_dir_all(&dir)?;
    let relative_path = adapters_dir.join(&filename);
    let root_dir = Path::new(".");
    let path = root_dir.join(&relative_path);
    let mut file = File::create(path)?;
    file.write_all(contents.as_bytes())?;
    eprintln!("created {}", relative_path.display());

    // Reference it from the parent module
    let relative_path = dir.join("mod.rs");
    let path = root_dir.join(&relative_path);
    let code = match path.exists() {
        false => String::new(),
        true => fs::read_to_string(&path)?,
    };
    let new_code = {
        let syntax = syn::parse_file(&code)?;
        let mods = find_mods(&syntax);
        if !mods.iter().any(|item_mod| item_mod.ident == modulename) {
            let mut new_line = format!("pub mod {modulename};\n");
            if code.starts_with("use ") {
                new_line = format!("{new_line}\n");
            }
            format!("{new_line}{code}")
        } else {
            code.clone()
        }
    };
    if code != new_code {
        fs::write(&path, new_code)?;
        eprintln!("updated {}", relative_path.display());
    }

    Ok(())
}

fn struct_name(name: &str) -> String {
    format!("{}Adapter", change_case::pascal_case(name))
}

fn find_mods(syntax: &syn::File) -> Vec<ItemMod> {
    syntax
        .items
        .iter()
        .filter_map(|item| match item {
            Item::Mod(impl_) => Some(impl_.clone()),
            _ => None,
        })
        .collect()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn can_generate_struct_name() {
        assert_eq!(struct_name("customer"), "CustomerAdapter");
        assert_eq!(struct_name("line-item"), "LineItemAdapter");
    }
}