it: works

.gitignore

@@ -1 +1,3 @@
 /target
+
+Cargo.lock

Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 4
-
-[[package]]
-name = "const-macros"
-version = "0.1.0"

Cargo.toml

@@ -9,10 +9,8 @@ repository = "https://git.javalsai.tuxcord.net/rust/const-macros"
 keywords = ["compile", "const", "macro"]
 categories = ["development-tools::procedural-macro-helpers"]
 
-[lib]
-proc-macro = true
-
 [dependencies]
+const-macros-proc = { path = "./const-macros-proc" }
 
 [lints.clippy]
 cargo = { level = "warn", priority = -1 }

assets/DATA1

@@ -0,0 +1 @@
+This is just a bunch of bytes that will hash to a known sequence and I can test for validity

const-macros-proc/.gitignore

@@ -0,0 +1 @@
+/target

const-macros-proc/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "const-macros-proc"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+magic = "0.16"
+sha2 = "0.10"

const-macros-proc/src/lib.rs

@@ -0,0 +1,126 @@
+#![feature(proc_macro_value)]
+use std::{fs::File, io::Read};
+
+use proc_macro::{Delimiter, Group, Literal, Punct, TokenStream, TokenTree};
+use sha2::Digest;
+
+fn read_path_literal(input: TokenStream) -> String {
+    println!("{input:?}");
+    let mut input_iter = input.into_iter();
+    let path_token = input_iter.next().expect("expected a path");
+    assert!(input_iter.next().is_none(), "only expected one argument");
+
+    let path_literal = match path_token {
+        TokenTree::Group(path_group) => {
+            let mut path_stream = path_group.stream().into_iter();
+            let path_literal = path_stream.next().expect("expected a str literal");
+            assert!(path_stream.next().is_none(), "expected a str literal");
+
+            let TokenTree::Literal(path_literal) = path_literal else {
+                panic!("expected a str literal");
+            };
+
+            path_literal
+        }
+        TokenTree::Literal(path_literal) => path_literal,
+        _ => panic!("expected a str literal"),
+    };
+
+    // eprintln!("{path_literal:?}");
+    path_literal.str_value().expect("expected a str literal")
+}
+
+fn extend_grouped(
+    ts: &mut TokenStream,
+    delim: Delimiter,
+    items: impl Iterator<Item = TokenStream>,
+) {
+    let mut comma_ts = TokenStream::new();
+    comma_ts.extend(std::iter::once(TokenTree::Punct(Punct::new(
+        ',',
+        proc_macro::Spacing::Alone,
+    ))));
+
+    let mut tuple_content = TokenStream::new();
+    tuple_content.extend(items.flat_map(|token| [token, comma_ts.clone()]));
+
+    ts.extend(std::iter::once(TokenTree::Group(Group::new(
+        delim,
+        tuple_content,
+    ))));
+}
+
+fn extend_array(ts: &mut TokenStream, array: &[u8]) {
+    extend_grouped(
+        ts,
+        Delimiter::Bracket,
+        array.iter().map(|&b| {
+            let mut ts = TokenStream::new();
+            ts.extend(std::iter::once(TokenTree::Literal(Literal::u8_unsuffixed(
+                b,
+            ))));
+            ts
+        }),
+    );
+}
+
+fn extend_asset_tuple(ts: &mut TokenStream, buf: &[u8], mime: &str, sha256sum: [u8; 32]) {
+    extend_grouped(
+        ts,
+        Delimiter::Parenthesis,
+        [
+            {
+                let mut ts = TokenStream::new();
+                ts.extend(std::iter::once(TokenTree::Punct(Punct::new(
+                    '&',
+                    proc_macro::Spacing::Joint,
+                ))));
+                extend_array(&mut ts, buf);
+                ts
+            },
+            {
+                let mut ts = TokenStream::new();
+                ts.extend(std::iter::once(Literal::string(mime)));
+                ts
+            },
+            {
+                let mut ts = TokenStream::new();
+                extend_array(&mut ts, &sha256sum);
+                ts
+            },
+        ]
+        .into_iter(),
+    );
+}
+
+fn get_mime(buf: &[u8]) -> String {
+    let cookie =
+        magic::Cookie::open(magic::cookie::Flags::MIME).expect("failure opening mime cookie");
+    let cookie = cookie
+        .load(&magic::cookie::DatabasePaths::default())
+        .expect("failure loading magic db");
+
+    cookie.buffer(buf).expect("error getting file mime")
+}
+
+fn get_sha256sum(buf: &[u8]) -> [u8; 32] {
+    sha2::Sha256::digest(buf)
+        .as_slice()
+        .try_into()
+        .expect("failed to sha256sum file")
+}
+
+#[proc_macro]
+#[allow(clippy::missing_panics_doc)]
+pub fn include_asset(input: TokenStream) -> TokenStream {
+    let path = read_path_literal(input);
+    let mut buf = Vec::new();
+    File::open(path)
+        .expect("couldn't open file")
+        .read_to_end(&mut buf)
+        .expect("error reading file");
+
+    let mut ts = TokenStream::new();
+    extend_asset_tuple(&mut ts, &buf, &get_mime(&buf), get_sha256sum(&buf));
+    ts
+}

src/lib.rs

@@ -1,15 +1,61 @@
-// #[must_use]
-// pub const fn add(left: u64, right: u64) -> u64 {
-//     left + right
-// }
+// So hand working with [`TokenStream`] might be a bad idea BUT I partially made this crate to
+// learn about [`proc_macro`] so I'm not gonna use [`quote`] or [`syn`]
 
-// #[cfg(test)]
-// mod tests {
-//     use super::*;
+pub mod file {
+    pub type IncludeAssetMacroTy = (&'static [u8], &'static str, [u8; 32]);
 
-//     #[test]
-//     fn it_works() {
-//         let result = add(2, 2);
-//         assert_eq!(result, 4);
-//     }
-// }
+    pub struct FileAsset {
+        pub bytes: &'static [u8],
+        pub mime: &'static str,
+        pub shasum: [u8; 32],
+    }
+
+    impl FileAsset {
+        #[must_use]
+        pub const fn from_tuple(tuple: IncludeAssetMacroTy) -> Self {
+            Self {
+                bytes: tuple.0,
+                mime: tuple.1,
+                shasum: tuple.2,
+            }
+        }
+    }
+
+    impl From<IncludeAssetMacroTy> for FileAsset {
+        fn from(value: (&'static [u8], &'static str, [u8; 32])) -> Self {
+            Self::from_tuple(value)
+        }
+    }
+
+    #[macro_export]
+    macro_rules! include_asset {
+        ($path:literal) => {
+            $crate::file::FileAsset::from_tuple($crate::file::_include_asset!($path))
+        };
+    }
+    pub use include_asset;
+
+    pub use const_macros_proc::include_asset as _include_asset;
+
+    #[cfg(test)]
+    pub mod test {
+        #[test]
+        fn works() {
+            const ASSET1: super::FileAsset = super::include_asset!("assets/DATA1");
+            const ASSET2: super::FileAsset = super::include_asset!("assets/DATA2");
+
+            assert_eq!(ASSET1.bytes, b"This is just a bunch of bytes that will hash to a known sequence and I can test for validity\n");
+            assert_eq!(ASSET1.mime, "text/plain; charset=us-ascii");
+            assert_eq!(
+                ASSET1.shasum,
+                [
+                    0x4f, 0x72, 0xae, 0x5a, 0x7e, 0x2d, 0x70, 0xfe, 0xc4, 0x13, 0xaf, 0x0e, 0x29,
+                    0x8f, 0x1b, 0x7a, 0x7c, 0x1d, 0x8d, 0x9c, 0xaf, 0x4f, 0xd6, 0x24, 0x46, 0x0d,
+                    0x2f, 0xe2, 0xd8, 0x1b, 0x83, 0x28,
+                ]
+            );
+
+            assert_eq!(ASSET2.mime, "image/png; charset=binary");
+        }
+    }
+}