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#rust#proc-macro#http

git clone https://pyrossh.dev/repos/rust-embed.git
Discussions: https://groups.google.com/g/rust-embed-devs

rust macro which loads files into the rust binary at compile time during release and loads the file from the fs during dev.

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83eaed49 — Peter John

5 years ago 
Merge pull request #125 from djmarcin/master
Files changed (2) hide show
  1. impl/src/lib.rs +73 -46
  2. utils/src/lib.rs +1 -0
impl/src/lib.rs CHANGED
@@ -7,9 +7,62 @@ use proc_macro::TokenStream;
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  use std::{env, path::Path};
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  use syn::{export::TokenStream2, Data, DeriveInput, Fields, Lit, Meta};
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- #[cfg(all(debug_assertions, not(feature = "debug-embed")))]
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- fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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+ fn embedded(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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+ extern crate rust_embed_utils;
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+
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+ let mut match_values = Vec::<TokenStream2>::new();
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+ let mut list_values = Vec::<String>::new();
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+
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+ for rust_embed_utils::FileEntry { rel_path, full_canonical_path } in rust_embed_utils::get_files(folder_path) {
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+ match_values.push(embed_file(&rel_path, &full_canonical_path));
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+ list_values.push(rel_path);
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+ }
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+
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+ let array_len = list_values.len();
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+
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+ // If debug-embed is on, unconditionally include the code below. Otherwise,
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+ // make it conditional on cfg(not(debug_assertions)).
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+ let not_debug_attr = if cfg!(feature = "debug-embed") {
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+ quote! {}
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+ } else {
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+ quote! { #[cfg(not(debug_assertions))]}
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+ };
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+
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  quote! {
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+ #not_debug_attr
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+ impl #ident {
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+ pub fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
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+ match file_path.replace("\\", "/").as_str() {
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+ #(#match_values)*
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+ _ => None,
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+ }
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+ }
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+
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+ fn names() -> std::slice::Iter<'static, &'static str> {
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+ const items: [&str; #array_len] = [#(#list_values),*];
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+ items.iter()
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+ }
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+
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+ pub fn iter() -> impl Iterator<Item = std::borrow::Cow<'static, str>> {
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+ Self::names().map(|x| std::borrow::Cow::from(*x))
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+ }
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+ }
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+
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+ #not_debug_attr
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+ impl rust_embed::RustEmbed for #ident {
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+ fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
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+ #ident::get(file_path)
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+ }
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+ fn iter() -> rust_embed::Filenames {
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+ rust_embed::Filenames::Embedded(#ident::names())
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+ }
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+ }
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+ }
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+ }
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+
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+ fn dynamic(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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+ quote! {
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+ #[cfg(debug_assertions)]
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  impl #ident {
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  pub fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
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  use std::fs;
@@ -29,6 +82,8 @@ fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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  rust_embed::utils::get_files(String::from(#folder_path)).map(|e| std::borrow::Cow::from(e.rel_path))
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  }
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  }
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+
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+ #[cfg(debug_assertions)]
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  impl rust_embed::RustEmbed for #ident {
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  fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
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  #ident::get(file_path)
@@ -41,7 +96,21 @@ fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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  }
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  }
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+ fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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+ let embedded_impl = embedded(ident, folder_path.clone());
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+ if cfg!(feature = "debug-embed") {
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+ return embedded_impl;
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+ }
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+
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+ let dynamic_impl = dynamic(ident, folder_path);
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+
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+ quote! {
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+ #embedded_impl
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+ #dynamic_impl
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+ }
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+ }
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+
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- #[cfg(all(not(feature = "compression"), any(not(debug_assertions), feature = "debug-embed")))]
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+ #[cfg(not(feature = "compression"))]
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  fn embed_file(rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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  quote! {
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  #rel_path => {
@@ -51,7 +120,7 @@ fn embed_file(rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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  }
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  }
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- #[cfg(all(feature = "compression", any(not(debug_assertions), feature = "debug-embed")))]
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+ #[cfg(feature = "compression")]
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  fn embed_file(rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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  quote! {
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  #rel_path => {
@@ -63,48 +132,6 @@ fn embed_file(rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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  }
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  }
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- #[cfg(any(not(debug_assertions), feature = "debug-embed"))]
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- fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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- extern crate rust_embed_utils;
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-
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- let mut match_values = Vec::<TokenStream2>::new();
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- let mut list_values = Vec::<String>::new();
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-
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- for rust_embed_utils::FileEntry { rel_path, full_canonical_path } in rust_embed_utils::get_files(folder_path) {
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- match_values.push(embed_file(&rel_path, &full_canonical_path));
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- list_values.push(rel_path);
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- }
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-
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- let array_len = list_values.len();
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-
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- quote! {
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- impl #ident {
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- pub fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
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- match file_path.replace("\\", "/").as_str() {
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- #(#match_values)*
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- _ => None,
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- }
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- }
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-
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- fn names() -> std::slice::Iter<'static, &'static str> {
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- const items: [&str; #array_len] = [#(#list_values),*];
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- items.iter()
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- }
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- pub fn iter() -> impl Iterator<Item = std::borrow::Cow<'static, str>> {
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- Self::names().map(|x| std::borrow::Cow::from(*x))
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- }
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- }
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- impl rust_embed::RustEmbed for #ident {
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- fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
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- #ident::get(file_path)
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- }
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- fn iter() -> rust_embed::Filenames {
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- rust_embed::Filenames::Embedded(#ident::names())
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- }
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- }
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- }
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- }
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-
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  fn impl_rust_embed(ast: &syn::DeriveInput) -> TokenStream2 {
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  match ast.data {
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  Data::Struct(ref data) => match data.fields {
utils/src/lib.rs CHANGED
@@ -7,6 +7,7 @@ pub struct FileEntry {
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  #[cfg_attr(all(debug_assertions, not(feature = "debug-embed")), allow(unused))]
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  pub fn get_files(folder_path: String) -> impl Iterator<Item = FileEntry> {
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  walkdir::WalkDir::new(&folder_path)
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+ .follow_links(true)
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  .into_iter()
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  .filter_map(|e| e.ok())
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  .filter(|e| e.file_type().is_file())