mirror of https://github.com/sgoudham/neovide.git
Settings derive macro (#439)
* Added procedural macro crate * Initial derive macro implementation * Compiles for cursor settings * Derive macro working correctly * Derive macro working for all settings structs * Cleanup * Moved the binary back to the project root * remove unused utils file Co-authored-by: Tim Harding <Tim@TimHarding.co>macos-click-through
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[package]
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name = "neovide-derive"
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version = "0.1.0"
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edition = "2018"
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[lib]
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proc-macro = true
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[dependencies]
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syn = "1.0"
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quote = "1.0"
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use proc_macro::TokenStream;
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use quote::quote;
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use syn::{parse_macro_input, Attribute, Data, DataStruct, DeriveInput, Error, Ident, Lit, Meta};
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#[proc_macro_derive(SettingGroup, attributes(setting_prefix))]
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pub fn setting_group(item: TokenStream) -> TokenStream {
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let input = parse_macro_input!(item as DeriveInput);
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let prefix = setting_prefix(input.attrs.as_ref())
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.map(|p| format!("{}_", p))
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.unwrap_or("".to_string());
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stream(input, prefix)
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}
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fn stream(input: DeriveInput, prefix: String) -> TokenStream {
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const ERR_MSG: &'static str = "Derive macro expects a struct";
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match input.data {
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Data::Struct(ref data) => struct_stream(input.ident, prefix, data),
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Data::Enum(data) => Error::new_spanned(data.enum_token, ERR_MSG)
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.to_compile_error()
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.into(),
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Data::Union(data) => Error::new_spanned(data.union_token, ERR_MSG)
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.to_compile_error()
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.into(),
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}
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}
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fn struct_stream(name: Ident, prefix: String, data: &DataStruct) -> TokenStream {
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let fragments = data.fields.iter().map(|field| match field.ident {
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Some(ref ident) => {
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let vim_setting_name = format!("{}{}", prefix, ident);
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quote! {{
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fn update_func(value: rmpv::Value) {
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let mut s = crate::settings::SETTINGS.get::<#name>();
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s.#ident.from_value(value);
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crate::settings::SETTINGS.set(&s);
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}
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fn reader_func() -> rmpv::Value {
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let s = crate::settings::SETTINGS.get::<#name>();
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s.#ident.into()
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}
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crate::settings::SETTINGS.set_setting_handlers(
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#vim_setting_name,
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update_func,
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reader_func
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);
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}}
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}
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None => {
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Error::new_spanned(field.colon_token, "Expected named struct fields").to_compile_error()
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}
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});
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let expanded = quote! {
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impl #name {
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pub fn register() {
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let s: Self = Default::default();
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crate::settings::SETTINGS.set(&s);
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#(#fragments)*
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}
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}
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};
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TokenStream::from(expanded)
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}
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fn setting_prefix(attrs: &[Attribute]) -> Option<String> {
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for attr in attrs.iter() {
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if let Ok(Meta::NameValue(name_value)) = attr.parse_meta() {
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if name_value.path.is_ident("setting_prefix") {
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if let Lit::Str(literal) = name_value.lit {
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return Some(literal.value());
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}
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}
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}
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}
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None
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}
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use super::KeyboardLayout;
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use super::KeyboardLayout;
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use crate::{
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use crate::settings::FromValue;
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register_nvim_setting,
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settings::{FromValue, Value, SETTINGS},
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};
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#[derive(Clone)]
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#[setting_prefix = "keyboard"]
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#[derive(Clone, SettingGroup)]
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pub struct KeyboardSettings {
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pub struct KeyboardSettings {
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pub layout: KeyboardLayout,
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pub layout: KeyboardLayout,
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}
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}
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pub fn initialize_settings() {
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impl Default for KeyboardSettings {
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SETTINGS.set(&KeyboardSettings {
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fn default() -> Self {
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layout: KeyboardLayout::Qwerty,
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Self {
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});
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layout: KeyboardLayout::Qwerty,
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register_nvim_setting!("keyboard_layout", KeyboardSettings::layout);
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}
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}
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}
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}
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