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use std::env;
use proc_macro2::{Span, TokenStream};
use proc_macro_error::abort_call_site;
use quote::quote;
use syn::{Attribute, Data, DataStruct, DeriveInput, Fields, Ident};
use crate::{
attrs::{Attrs, Name, DEFAULT_CASING, DEFAULT_ENV_CASING},
dummies,
utils::Sp,
};
pub fn derive_into_app(input: &DeriveInput) -> TokenStream {
let ident = &input.ident;
dummies::into_app(ident);
match input.data {
Data::Struct(DataStruct {
fields: Fields::Named(_),
..
}) => gen_for_struct(ident, &input.attrs),
Data::Struct(DataStruct {
fields: Fields::Unit,
..
}) => gen_for_struct(ident, &input.attrs),
Data::Enum(_) => gen_for_enum(ident, &input.attrs),
_ => abort_call_site!("`#[derive(IntoApp)]` only supports non-tuple structs and enums"),
}
}
pub fn gen_for_struct(struct_name: &Ident, attrs: &[Attribute]) -> TokenStream {
let app_name = env::var("CARGO_PKG_NAME").ok().unwrap_or_default();
let attrs = Attrs::from_struct(
Span::call_site(),
attrs,
Name::Assigned(quote!(#app_name)),
Sp::call_site(DEFAULT_CASING),
Sp::call_site(DEFAULT_ENV_CASING),
);
let name = attrs.cased_name();
let tokens = quote! {
#[allow(dead_code, unreachable_code, unused_variables)]
#[allow(
clippy::style,
clippy::complexity,
clippy::pedantic,
clippy::restriction,
clippy::perf,
clippy::deprecated,
clippy::nursery,
clippy::cargo
)]
#[deny(clippy::correctness)]
impl clap::IntoApp for #struct_name {
fn into_app<'b>() -> clap::App<'b> {
let app = clap::App::new(#name);
<#struct_name as clap::Args>::augment_args(app)
}
fn into_app_for_update<'b>() -> clap::App<'b> {
let app = clap::App::new(#name);
<#struct_name as clap::Args>::augment_args_for_update(app)
}
}
};
tokens
}
pub fn gen_for_enum(enum_name: &Ident, attrs: &[Attribute]) -> TokenStream {
let app_name = env::var("CARGO_PKG_NAME").ok().unwrap_or_default();
let attrs = Attrs::from_struct(
Span::call_site(),
attrs,
Name::Assigned(quote!(#app_name)),
Sp::call_site(DEFAULT_CASING),
Sp::call_site(DEFAULT_ENV_CASING),
);
let name = attrs.cased_name();
let app_var = Ident::new("app", Span::call_site());
quote! {
#[allow(dead_code, unreachable_code, unused_variables)]
#[allow(
clippy::style,
clippy::complexity,
clippy::pedantic,
clippy::restriction,
clippy::perf,
clippy::deprecated,
clippy::nursery,
clippy::cargo
)]
#[deny(clippy::correctness)]
impl clap::IntoApp for #enum_name {
fn into_app<'b>() -> clap::App<'b> {
let #app_var = clap::App::new(#name)
.setting(clap::AppSettings::SubcommandRequiredElseHelp);
<#enum_name as clap::Subcommand>::augment_subcommands(#app_var)
}
fn into_app_for_update<'b>() -> clap::App<'b> {
let #app_var = clap::App::new(#name);
<#enum_name as clap::Subcommand>::augment_subcommands_for_update(#app_var)
}
}
}
}
