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use std::error::Error;
use std::str::FromStr;
use opengl_registry::command::Command;
use proc_macro2::{LexError, TokenStream};
use quote::{format_ident, quote};
use crate::codegen::formatting::{clean_param_name, fix_type};
pub fn create_command_functions(
commands: &[Command],
) -> Result<Vec<TokenStream>, Box<dyn Error>>
{
commands.iter().map(|command| {
let command_name_str = command.prototype().name();
let command_name = format_ident!("{}", command.prototype().name());
let command_name_prefixless = format_ident!("{}", command.prototype()
.name()
.strip_prefix("gl")
.unwrap_or_else(|| command.prototype().name()));
let command_args = command
.parameters()
.iter()
.map(|param| {
let param_name = format_ident!("{}", clean_param_name(param.name()));
let param_type = TokenStream::from_str(&fix_type(param.get_type()))?;
Ok::<_, LexError>(quote! { #param_name: #param_type })
}).collect::<Result<Vec<_>, _>>()?;
let command_return_type = TokenStream::from_str(&fix_type(command.prototype().return_type()))?;
let command_arg_types = command
.parameters()
.iter()
.map(|param| TokenStream::from_str(&fix_type(param.get_type())))
.collect::<Result<Vec<_>, _>>()?;
let command_arg_names = command
.parameters()
.iter()
.map(|param| format_ident!("{}", clean_param_name(param.name())))
.collect::<Vec<_>>();
Ok(quote! {
#[doc = #command_name_str]
#[allow(non_snake_case, clippy::too_many_arguments)]
pub unsafe fn #command_name_prefixless(#(#command_args),*) -> #command_return_type {
type GLFunc =
unsafe extern "C" fn(#(#command_arg_types),*) -> #command_return_type;
let gl_func = std::mem::transmute::<_, GLFunc>(functions::#command_name);
gl_func(#(#command_arg_names),*)
}
})
}).collect()
}
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