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use proc_macro::TokenStream;
use std::fs::File;
use std::io::prelude::*;
use std::path::Path;
#[proc_macro]
pub fn enum_category(_item: TokenStream) -> TokenStream {
let path = Path::new(env!("CARGO_MANIFEST_DIR"));
let mut f = File::open(path.join("output/categories.json")).unwrap();
let mut contents = String::new();
f.read_to_string(&mut contents).unwrap();
let categories: Vec<String> = serde_json::from_str(&contents).unwrap();
let mut enum_category = String::from("#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]\npub enum Category {\n");
for category in &categories {
enum_category.push_str(&format!(
" {},\n",
category.split(' ').collect::<Vec<&str>>()[0].replace('+', "").replace("-", "_")
));
}
enum_category.push_str(" NoCategory,\n");
enum_category.push_str("}");
enum_category.push_str(
"
impl std::str::FromStr for Category {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
",
);
for category in &categories {
enum_category.push_str(&format!(
" \"{}\" => Ok(Category::{}),\n",
category,
category.split(' ').collect::<Vec<&str>>()[0].replace('+', "").replace("-", "_")
));
}
enum_category.push_str(
"
_ => Err(()),
}
}
}
",
);
enum_category.push_str(
"
impl std::fmt::Display for Category {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
",
);
for category in &categories {
enum_category.push_str(&format!(
" Category::{} => write!(f, \"{}\"),\n",
category.split(' ').collect::<Vec<&str>>()[0].replace('+', "").replace("-", "_"),
category.split(' ').collect::<Vec<&str>>()[0].replace('+', "").replace("-", "_")
));
}
enum_category.push_str(
"
Category::NoCategory => write!(f, \"NoCategory\"),
}
}
}
",
);
enum_category.parse().unwrap()
}