~repos /rust-embed

#rust#proc-macro#http

git clone https://pyrossh.dev/repos/rust-embed.git

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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1fb92450 — Peter John

2 years ago 
Merge pull request #212 from osiewicz/issue-182/include_flate_0.2
Files changed (1) hide show
  1. impl/src/lib.rs +40 -18
impl/src/lib.rs CHANGED
@@ -6,10 +6,16 @@ extern crate proc_macro;
6
6
 
7
7
  use proc_macro::TokenStream;
8
8
  use proc_macro2::TokenStream as TokenStream2;
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+ use std::{
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+ env,
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+ iter::FromIterator,
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- use std::{env, path::Path};
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+ path::{Path, PathBuf},
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+ };
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  use syn::{Data, DeriveInput, Expr, ExprLit, Fields, Lit, Meta, MetaNameValue};
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+ fn embedded(
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- fn embedded(ident: &syn::Ident, folder_path: String, prefix: Option<&str>, includes: &[String], excludes: &[String]) -> TokenStream2 {
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+ ident: &syn::Ident, relative_folder_path: Option<&str>, absolute_folder_path: String, prefix: Option<&str>, includes: &[String], excludes: &[String],
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+ ) -> TokenStream2 {
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  extern crate rust_embed_utils;
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20
 
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  let mut match_values = Vec::<TokenStream2>::new();
@@ -17,8 +23,8 @@ fn embedded(ident: &syn::Ident, folder_path: String, prefix: Option<&str>, inclu
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23
 
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  let includes: Vec<&str> = includes.iter().map(AsRef::as_ref).collect();
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  let excludes: Vec<&str> = excludes.iter().map(AsRef::as_ref).collect();
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- for rust_embed_utils::FileEntry { rel_path, full_canonical_path } in rust_embed_utils::get_files(folder_path, &includes, &excludes) {
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+ for rust_embed_utils::FileEntry { rel_path, full_canonical_path } in rust_embed_utils::get_files(absolute_folder_path.clone(), &includes, &excludes) {
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- match_values.push(embed_file(&rel_path, &full_canonical_path));
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+ match_values.push(embed_file(relative_folder_path.clone(), &rel_path, &full_canonical_path));
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28
 
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  list_values.push(if let Some(prefix) = prefix {
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  format!("{}{}", prefix, rel_path)
@@ -153,13 +159,22 @@ fn dynamic(ident: &syn::Ident, folder_path: String, prefix: Option<&str>, includ
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  }
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  }
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161
 
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+ fn generate_assets(
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- fn generate_assets(ident: &syn::Ident, folder_path: String, prefix: Option<String>, includes: Vec<String>, excludes: Vec<String>) -> TokenStream2 {
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+ ident: &syn::Ident, relative_folder_path: Option<&str>, absolute_folder_path: String, prefix: Option<String>, includes: Vec<String>, excludes: Vec<String>,
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+ ) -> TokenStream2 {
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- let embedded_impl = embedded(ident, folder_path.clone(), prefix.as_deref(), &includes, &excludes);
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+ let embedded_impl = embedded(
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+ ident,
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+ relative_folder_path,
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+ absolute_folder_path.clone(),
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+ prefix.as_deref(),
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+ &includes,
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+ &excludes,
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+ );
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  if cfg!(feature = "debug-embed") {
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  return embedded_impl;
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  }
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176
 
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- let dynamic_impl = dynamic(ident, folder_path, prefix.as_deref(), &includes, &excludes);
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+ let dynamic_impl = dynamic(ident, absolute_folder_path, prefix.as_deref(), &includes, &excludes);
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178
 
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  quote! {
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  #embedded_impl
@@ -167,7 +182,7 @@ fn generate_assets(ident: &syn::Ident, folder_path: String, prefix: Option<Strin
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182
  }
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183
  }
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184
 
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- fn embed_file(rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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+ fn embed_file(folder_path: Option<&str>, rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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  let file = rust_embed_utils::read_file_from_fs(Path::new(full_canonical_path)).expect("File should be readable");
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  let hash = file.metadata.sha256_hash();
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  let last_modified = match file.metadata.last_modified() {
@@ -183,8 +198,11 @@ fn embed_file(rel_path: &str, full_canonical_path: &str) -> TokenStream2 {
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  let mimetype_tokens = TokenStream2::new();
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199
 
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  let embedding_code = if cfg!(feature = "compression") {
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+ // Print some debugging information
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+ let full_relative_path = PathBuf::from_iter([folder_path.expect("folder_path must be provided under `compression` feature"), rel_path]);
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+ let full_relative_path = full_relative_path.to_string_lossy();
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  quote! {
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- rust_embed::flate!(static FILE: [u8] from #full_canonical_path);
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+ rust_embed::flate!(static FILE: [u8] from #full_relative_path);
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  let bytes = &FILE[..];
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  }
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  } else {
@@ -249,26 +267,30 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> TokenStream2 {
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  let folder_path = shellexpand::full(&folder_path).unwrap().to_string();
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268
 
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  // Base relative paths on the Cargo.toml location
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- let folder_path = if Path::new(&folder_path).is_relative() {
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+ let (relative_path, absolute_folder_path) = if Path::new(&folder_path).is_relative() {
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- Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap())
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+ let absolute_path = Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap())
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- .join(folder_path)
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+ .join(&folder_path)
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273
  .to_str()
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  .unwrap()
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- .to_owned()
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+ .to_owned();
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+ (Some(folder_path.clone()), absolute_path)
258
277
  } else {
278
+ if cfg!(feature = "compression") {
279
+ panic!("`folder` must be a relative path under `compression` feature.")
280
+ }
259
- folder_path
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+ (None, folder_path)
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282
  };
261
283
 
262
- if !Path::new(&folder_path).exists() {
284
+ if !Path::new(&absolute_folder_path).exists() {
263
285
  let mut message = format!(
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  "#[derive(RustEmbed)] folder '{}' does not exist. cwd: '{}'",
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- folder_path,
287
+ absolute_folder_path,
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  std::env::current_dir().unwrap().to_str().unwrap()
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289
  );
268
290
 
269
291
  // Add a message about the interpolate-folder-path feature if the path may
270
292
  // include a variable
271
- if folder_path.contains('$') && cfg!(not(feature = "interpolate-folder-path")) {
293
+ if absolute_folder_path.contains('$') && cfg!(not(feature = "interpolate-folder-path")) {
272
294
  message += "\nA variable has been detected. RustEmbed can expand variables \
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295
  when the `interpolate-folder-path` feature is enabled.";
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296
  }
@@ -276,7 +298,7 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> TokenStream2 {
276
298
  panic!("{}", message);
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299
  };
278
300
 
279
- generate_assets(&ast.ident, folder_path, prefix, includes, excludes)
301
+ generate_assets(&ast.ident, relative_path.as_deref(), absolute_folder_path, prefix, includes, excludes)
280
302
  }
281
303
 
282
304
  #[proc_macro_derive(RustEmbed, attributes(folder, prefix, include, exclude))]