fhtmx-derive 0.4.0

Create html with rust with support for htmx.
Documentation 
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mod utils;

use crate::utils::{DaisyColorAttr, ExprOrString, Mode, PostProc};
use darling::{FromDeriveInput, FromField, ast::Data};
use proc_macro::TokenStream;
use quote::quote;
use syn::{DeriveInput, Ident};

#[derive(FromField)]
#[darling(attributes(html_view))]
struct HtmlViewField {
    ident: Option<Ident>,
    #[darling(default)]
    alias: Option<String>,
    #[darling(default)]
    value: Option<ExprOrString>,
    #[darling(default)]
    row_class: Option<String>,
    #[darling(default)]
    value_class: Option<String>,
    #[darling(default)]
    skip: bool,
}

#[derive(FromDeriveInput)]
#[darling(attributes(html_view), supports(struct_named))]
struct HtmlViewInput {
    ident: Ident,
    data: Data<(), HtmlViewField>,
    #[darling(default)]
    mode: Mode,
    #[darling(default)]
    title: Option<ExprOrString>,
    #[darling(default)]
    color: Option<DaisyColorAttr>,
    #[darling(default)]
    class: Option<ExprOrString>,
    #[darling(default)]
    mode_class: Option<ExprOrString>,
    #[darling(default)]
    postproc: PostProc,
}

#[proc_macro_derive(HtmlView, attributes(html_view))]
pub fn derive_html_view(input: TokenStream) -> TokenStream {
    let input = syn::parse_macro_input!(input as DeriveInput);
    let parsed = match HtmlViewInput::from_derive_input(&input) {
        Ok(v) => v,
        Err(e) => return e.write_errors().into(),
    };
    let mode = parsed.mode;

    // Extract fields from the parsed data
    let fields = parsed.data.take_struct().expect("expected named struct");
    let field_items = fields.into_iter().filter(|o| !o.skip).map(|o| {
        let field_ident = o.ident.unwrap();
        let key = o.alias.unwrap_or_else(|| field_ident.to_string());
        let value = match o.value {
            Some(ExprOrString(expr)) => quote! { #expr },
            None => quote! { self.#field_ident.html_content() },
        };
        let row_class = o.row_class.unwrap_or_else(|| "p-1".to_string());
        let value_class_call = o.value_class.map(|x| quote! { .class(#x) });
        match mode {
            Mode::List => quote! {
                .add(
                    html_list_row(
                        div().class("font-bold").add(#key),
                        div()#value_class_call.add(#value)
                    )
                    .add_class(#row_class)
                )
            },
            Mode::Table => quote! {
                .add(
                    tr()
                    .add(th().add(#key))
                    .add(td().add(#value))
                )
            },
            Mode::TableRight => quote! {
                .add(
                    tr()
                    .add(th().class("text-right").add(#key))
                    .add(td().add(#value))
                )
            },
        }
    });

    let struct_name = parsed.ident;

    let mode_class_call = parsed
        .mode_class
        .map(|ExprOrString(expr)| quote! { .add_class(#expr) });
    let content = match mode {
        Mode::List => quote! {
            dc_list() #mode_class_call #(#field_items)*
        },
        Mode::Table | Mode::TableRight => quote! {
            div()
            .class("overflow-x-auto")
            .add(dc_table() #mode_class_call .add(tbody() #(#field_items)*))
        },
    };

    let title = match parsed.title {
        Some(ExprOrString(expr)) => quote! { Some(#expr.as_ref()) },
        None => quote! { None },
    };
    let color_call = parsed
        .color
        .map(|x| x.to_tokens())
        .map(|x| quote! { .add_class(#x) });
    let class_call = parsed
        .class
        .map(|ExprOrString(expr)| quote! { .add_class(#expr) });
    let card = quote! { mk_card(#title, self.html_content()) #color_call #class_call };
    let postproc_card = match parsed.postproc {
        PostProc::None => quote! { #card },
        PostProc::Flag => quote! { self.postproc(#card) },
        PostProc::Custom(expr) => quote! { #expr(#card) },
    };

    quote! {
        impl HtmlView for #struct_name {
            fn html_content(&self) -> HtmlNode {
                #content .into_node()
            }

            fn html_view(&self) -> HtmlNode {
                #postproc_card .into_node()
            }
        }
    }
    .into()
}