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rust macro which loads files into the rust binary at compile time during release and loads the file from the fs during dev.
f3cf632d
—
Ryan Lopopolo 6 years ago
Interpolate environment variables in folder path
- impl/Cargo.toml +5 -0
- impl/src/lib.rs +9 -7
impl/Cargo.toml
CHANGED
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@@ -18,5 +18,10 @@ syn = "0.11"
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quote = "0.3"
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walkdir = "2.2.7"
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21
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+
[dependencies.shellexpand]
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+
version = "1.0"
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23
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+
optional = true
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24
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+
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[features]
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debug-embed = []
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27
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+
interpolate-folder-path = ["shellexpand"]
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impl/src/lib.rs
CHANGED
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@@ -4,6 +4,8 @@ extern crate proc_macro;
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4
4
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extern crate quote;
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5
5
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extern crate syn;
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6
6
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7
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+
#[cfg(feature = "interpolate-folder-path")]
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8
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+
extern crate shellexpand;
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7
9
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extern crate walkdir;
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8
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9
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use proc_macro::TokenStream;
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@@ -15,7 +17,7 @@ mod utils;
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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) -> quote::Tokens {
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-
quote! {
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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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use std::fs::File;
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@@ -75,7 +77,7 @@ fn generate_assets(ident: &syn::Ident, folder_path: String) -> quote::Tokens {
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75
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let array_len = list_values.len();
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78
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-
quote! {
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80
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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 {
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@@ -116,13 +118,10 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> Tokens {
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},
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};
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119
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-
let attribute = ast.attrs
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120
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-
.iter()
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121
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-
.map(|attr| &attr.value)
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122
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-
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121
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+
let attribute = ast.attrs.iter().map(|attr| &attr.value).find(|value| value.name() == "folder");
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let literal_value = match attribute {
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Some(&MetaItem::NameValue(_, ref literal)) => literal,
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125
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-
_ => help()
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+
_ => help(),
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};
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let folder_path = match literal_value {
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&Lit::Str(ref val, _) => val.clone(),
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@@ -131,6 +130,9 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> Tokens {
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}
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};
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+
#[cfg(feature = "interpolate-folder-path")]
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let folder_path = shellexpand::full(&folder_path).unwrap().to_string();
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+
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if !Path::new(&folder_path).exists() {
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panic!(
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"#[derive(RustEmbed)] folder '{}' does not exist. cwd: '{}'",
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