import argv
import blog
import blog/post
import filepath as path
import gleam/list
import gleam/string
import simplifile

pub fn main() -> Nil {
  let assert Ok(priv) = blog.priv_directory()
  let posts_path = path.join(priv, "posts")

  case argv.load().arguments {
    ["update_titles"] -> update_posts_titles(posts_path)
    _ -> Nil
  }
}

fn update_posts_titles(posts_path: String) -> Nil {
  let assert Ok(entries) = simplifile.read_directory(posts_path)
    as "Read posts directory"

  use file_name <- list.each(entries)
  let file_path = path.join(posts_path, file_name)
  let assert Ok(post) = post.from_string(path: file_path) as "Parse post"

  let new_file_name = post.meta.slug <> ".md"
  let new_file_path =
    string.replace(in: file_path, each: file_name, with: new_file_name)

  let assert Ok(_) = simplifile.rename(at: file_path, to: new_file_path)
    as "Rename post"
}