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18 commits
v0.2.3 ... main

Author SHA1 Message Date
49df03b2e8
Bump version to 0.3.6 2025-04-17 14:02:02 +02:00
b7dd6f9379
Better handling of invalid route.rs files 2025-04-17 13:59:29 +02:00
c7d4ba974b
Fix unneded dep & bump version to 0.3.5 2025-04-16 15:40:31 +02:00
621f0670ce
Bump version to 0.3.4 2025-04-16 15:31:02 +02:00
086b84c81d
Downgrade to 2021 edition 2025-04-16 15:29:01 +02:00
fdc79b41cf
Split into seperate files 2025-04-15 16:12:16 +02:00
4de26f8e50
Bump version to 0.3.3 2025-04-15 15:13:17 +02:00
ca7262d40e
Expand support to TRACE, CONNECT & any method 2025-04-15 15:10:44 +02:00
902ef858ce
Bump version to 0.3.2 2025-04-15 14:33:01 +02:00
9b90c53b35
Split up massive main macro fn 2025-04-15 14:27:15 +02:00
daf793eb06
Vastly improve testing
- simplify some examples
- add macrotest for expanding/snapshotting macro expansion & add tests
  - add workaround to enable referencing relative dirs from macrotest files
  - ensure workaround doesn't get built in release
- add trybuild for testing error messages & add tests
- fix indeterministic macro output
  - sort routes after collecting
  - use BTreeMap instead of HashMap to preserve insertion order
- fix compile_error syntax error
2025-04-15 13:33:40 +02:00
f0ce2b2737
Fix pedantic clippy lints 2025-04-15 03:41:41 +02:00
9aa37c1519
Fix docs & bump version to 0.3.1 2025-04-15 01:09:02 +02:00
ffa1dc5a7b
Run rustfmt 2025-04-15 01:00:23 +02:00
9dc4cc6c37
Rework README.md & CHANGELOG.md 2025-04-15 00:59:30 +02:00
fecb084cd5
Add note to changelog 2025-04-15 00:46:38 +02:00
551009c3eb
Bump version to 0.3 2025-04-15 00:45:49 +02:00
d05df1bb4d
Rework API to attribute macro 2025-04-15 00:42:48 +02:00
25 changed files with 991 additions and 375 deletions

1
.gitignore vendored
View file

@ -1,2 +1,3 @@
.direnv/
target/
wip/

View file

@ -1,15 +1,92 @@
# 0.2.3
- Refactored the detection of which methods exist,
we actually parse the file now instead of just checking that it contains `pub async #method_name`
# Changelog
# 0.2.2
- Re-licensed to MIT
All notable changes to this project will be documented in this file.
# 0.2.1
- Documentation & test improvements
## [Unreleased]
# 0.2.0
- Generate module imports instead of `include!`ing, so rust-analyzer works.
- Nothing yet
# 0.1.0
- MVP adapted from https://github.com/richardanaya/axum-folder-router-htmx
## [0.3.6] - 2025-04-17
- Better error messages when having route.rs files with invalid code
## [0.3.5] - 2025-04-16
- Moved macrotest to dev deps
## [0.3.4] - 2025-04-16
- Refactored huge lib.rs into 3 seperate files.
- Downgraded edition to 2021 for better compatability
## [0.3.3] - 2025-04-15
### Added
- Add support for remaining HTTP methods
- we no support the full set as defined by rfc9110
- trace & connect were missing specifically
- Add support for `any` axum router method (default method router, others will take precedence)
## [0.3.2] - 2025-04-15
- Refactor internals
- Add solid testing
- explicitly test generated macro output using macrotest
- test error output using trybuilt
## [0.3.1] - 2025-04-15
- Fix invalid doc links
## [0.3.0] - 2025-04-15
After some experimentation, the API has begun to stabilize. This should likely be the last breaking change for some time.
### Breaking Changes
- **Reworked implementation into an attribute macro**
- Previous implementation required function calls:
```rust
folder_router!("./examples/simple/api", AppState);
// ...
let folder_router: Router<AppState> = folder_router();
```
- New implementation uses an attribute macro:
```rust
#[folder_router("./examples/simple/api", AppState)]
struct MyFolderRouter;
// ...
let folder_router: Router<AppState> = MyFolderRouter::into_router();
```
- This approach provides a cleaner API and allows for multiple separate folder-based Routers
## [0.2.3] - 2025-04-14
### Changed
- **Improved method detection** - Now properly parses files instead of using string matching
- Previous version checked if file contained ```pub async #method_name```
- New version properly parses the file using `syn` for more accurate detection
## [0.2.2] - 2025-04-14
### Changed
- **License changed to MIT**
## [0.2.1] - 2025-04-14
### Improved
- Enhanced documentation
- Added more comprehensive tests
## [0.2.0] - 2024-04-14
### Changed
- **Improved code integration**
- Generate module imports instead of using ```include!```
- Makes the code compatible with rust-analyzer
- Provides better IDE support
## [0.1.0] - 2024-04-14
### Added
- Initial release
- Minimum viable product adapted from https://github.com/richardanaya/axum-folder-router-htmx

214
Cargo.lock generated
View file

@ -17,6 +17,15 @@ version = "2.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
[[package]]
name = "aho-corasick"
version = "1.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
dependencies = [
"memchr",
]
[[package]]
name = "anyhow"
version = "1.0.98"
@ -85,15 +94,18 @@ dependencies = [
[[package]]
name = "axum-folder-router"
version = "0.2.3"
version = "0.3.6"
dependencies = [
"anyhow",
"axum",
"glob",
"macrotest",
"proc-macro2",
"quote",
"regex",
"syn",
"tokio",
"trybuild",
]
[[package]]
@ -129,6 +141,24 @@ version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
[[package]]
name = "diff"
version = "0.1.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
[[package]]
name = "equivalent"
version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
[[package]]
name = "fastrand"
version = "2.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
[[package]]
name = "fnv"
version = "1.0.7"
@ -189,6 +219,12 @@ version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a8d1add55171497b4705a648c6b583acafb01d58050a51727785f0b2c8e0a2b2"
[[package]]
name = "hashbrown"
version = "0.15.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bf151400ff0baff5465007dd2f3e717f3fe502074ca563069ce3a6629d07b289"
[[package]]
name = "http"
version = "1.3.1"
@ -270,6 +306,16 @@ dependencies = [
"tower-service",
]
[[package]]
name = "indexmap"
version = "2.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cea70ddb795996207ad57735b50c5982d8844f38ba9ee5f1aedcfb708a2aa11e"
dependencies = [
"equivalent",
"hashbrown",
]
[[package]]
name = "itoa"
version = "1.0.15"
@ -278,9 +324,9 @@ checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
[[package]]
name = "libc"
version = "0.2.171"
version = "0.2.172"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
checksum = "d750af042f7ef4f724306de029d18836c26c1765a54a6a3f094cbd23a7267ffa"
[[package]]
name = "lock_api"
@ -298,6 +344,23 @@ version = "0.4.27"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
[[package]]
name = "macrotest"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0597a8d49ceeea5845b12d1970aa993261e68d4660b327eabab667b3e7ffd60"
dependencies = [
"diff",
"fastrand",
"glob",
"prettyplease",
"serde",
"serde_derive",
"serde_json",
"syn",
"toml_edit",
]
[[package]]
name = "matchit"
version = "0.8.4"
@ -333,7 +396,7 @@ checksum = "2886843bf800fba2e3377cff24abf6379b4c4d5c6681eaf9ea5b0d15090450bd"
dependencies = [
"libc",
"wasi",
"windows-sys",
"windows-sys 0.52.0",
]
[[package]]
@ -392,6 +455,16 @@ version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
[[package]]
name = "prettyplease"
version = "0.2.32"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "664ec5419c51e34154eec046ebcba56312d5a2fc3b09a06da188e1ad21afadf6"
dependencies = [
"proc-macro2",
"syn",
]
[[package]]
name = "proc-macro2"
version = "1.0.94"
@ -419,6 +492,35 @@ dependencies = [
"bitflags",
]
[[package]]
name = "regex"
version = "1.11.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
dependencies = [
"aho-corasick",
"memchr",
"regex-automata",
"regex-syntax",
]
[[package]]
name = "regex-automata"
version = "0.4.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
dependencies = [
"aho-corasick",
"memchr",
"regex-syntax",
]
[[package]]
name = "regex-syntax"
version = "0.8.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
[[package]]
name = "rustc-demangle"
version = "0.1.24"
@ -485,6 +587,15 @@ dependencies = [
"serde",
]
[[package]]
name = "serde_spanned"
version = "0.6.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "87607cb1398ed59d48732e575a4c28a7a8ebf2454b964fe3f224f2afc07909e1"
dependencies = [
"serde",
]
[[package]]
name = "serde_urlencoded"
version = "0.7.1"
@ -519,7 +630,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4f5fd57c80058a56cf5c777ab8a126398ece8e442983605d280a44ce79d0edef"
dependencies = [
"libc",
"windows-sys",
"windows-sys 0.52.0",
]
[[package]]
@ -539,6 +650,21 @@ version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0bf256ce5efdfa370213c1dabab5935a12e49f2c58d15e9eac2870d3b4f27263"
[[package]]
name = "target-triple"
version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1ac9aa371f599d22256307c24a9d748c041e548cbf599f35d890f9d365361790"
[[package]]
name = "termcolor"
version = "1.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
dependencies = [
"winapi-util",
]
[[package]]
name = "tokio"
version = "1.44.2"
@ -554,7 +680,7 @@ dependencies = [
"signal-hook-registry",
"socket2",
"tokio-macros",
"windows-sys",
"windows-sys 0.52.0",
]
[[package]]
@ -568,6 +694,40 @@ dependencies = [
"syn",
]
[[package]]
name = "toml"
version = "0.8.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cd87a5cdd6ffab733b2f74bc4fd7ee5fff6634124999ac278c35fc78c6120148"
dependencies = [
"serde",
"serde_spanned",
"toml_datetime",
"toml_edit",
]
[[package]]
name = "toml_datetime"
version = "0.6.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0dd7358ecb8fc2f8d014bf86f6f638ce72ba252a2c3a2572f2a795f1d23efb41"
dependencies = [
"serde",
]
[[package]]
name = "toml_edit"
version = "0.22.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "17b4795ff5edd201c7cd6dca065ae59972ce77d1b80fa0a84d94950ece7d1474"
dependencies = [
"indexmap",
"serde",
"serde_spanned",
"toml_datetime",
"winnow",
]
[[package]]
name = "tower"
version = "0.5.2"
@ -616,6 +776,21 @@ dependencies = [
"once_cell",
]
[[package]]
name = "trybuild"
version = "1.0.104"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6ae08be68c056db96f0e6c6dd820727cca756ced9e1f4cc7fdd20e2a55e23898"
dependencies = [
"glob",
"serde",
"serde_derive",
"serde_json",
"target-triple",
"termcolor",
"toml",
]
[[package]]
name = "unicode-ident"
version = "1.0.18"
@ -628,6 +803,15 @@ version = "0.11.0+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
[[package]]
name = "winapi-util"
version = "0.1.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
dependencies = [
"windows-sys 0.59.0",
]
[[package]]
name = "windows-sys"
version = "0.52.0"
@ -637,6 +821,15 @@ dependencies = [
"windows-targets",
]
[[package]]
name = "windows-sys"
version = "0.59.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
dependencies = [
"windows-targets",
]
[[package]]
name = "windows-targets"
version = "0.52.6"
@ -700,3 +893,12 @@ name = "windows_x86_64_msvc"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
[[package]]
name = "winnow"
version = "0.7.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "63d3fcd9bba44b03821e7d699eeee959f3126dcc4aa8e4ae18ec617c2a5cea10"
dependencies = [
"memchr",
]

View file

@ -1,7 +1,7 @@
[package]
name = "axum-folder-router"
version = "0.2.3"
edition = "2024"
version = "0.3.6"
edition = "2021"
readme = "./README.md"
authors = ["Tristan Druyen <ek36g2vcc@mozmail.com>"]
categories = ["web-programming"]
@ -20,8 +20,15 @@ syn = { version = "2.0", features = ["full"] }
quote = "1.0"
proc-macro2 = "1.0"
glob = "0.3"
regex = "1.11.1"
[dev-dependencies]
anyhow = "1.0.98"
axum = "0.8.3"
tokio = { version = "1.44.2", features = ["full"] }
trybuild = "1.0.104"
macrotest = "1.1.0"
[lints.clippy]
pedantic = { level = "warn", priority = -1 }
unused-async = { level = "allow", priority = 0 } # required for examples without unecessary noise

View file

@ -4,16 +4,21 @@
![Maintenance](https://img.shields.io/badge/maintenance-actively--developed-brightgreen.svg)
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
# axum-folder-router
```folder_router``` is a procedural macro for the Axum web framework that automatically generates router boilerplate based on your file structure.
It simplifies route organization by using filesystem conventions to define your API routes.
```#[folder_router(...)]``` is a procedural attribute macro for the Axum web framework that automatically generates router boilerplate based on your direcory & file structure.
Inspired by popular frameworks like next.js.
## Features
- **File System-Based Routing**: Define your API routes using intuitive folder structures
- **Reduced Boilerplate**: Automatically generates route mapping code
- **IDE Support**: Generates proper module imports for better rust-analyzer integration
- **Multiple Routers**: Create separate folder-based routers in the same application
## Usage
See [the examples](./examples) or [docs.rs](https://docs.rs/axum-folder-router).
For detailed instructions see [the examples](./examples) or [docs.rs](https://docs.rs/axum-folder-router).
## License

View file

@ -1,5 +1,5 @@
use axum::{extract::Path, response::IntoResponse};
pub async fn get(Path(path): Path<String>) -> impl IntoResponse {
format!("Requested file path: {}", path)
format!("Requested file path: {path}")
}

View file

@ -0,0 +1,12 @@
use axum::response::Html;
use axum::response::IntoResponse;
pub async fn get() -> impl IntoResponse {
Html("<h1>GET Pong!</h1>").into_response()
}
// This tests that our macro generates the routes in the correct order
// as any is only allowable as a first route.
pub async fn any() -> impl IntoResponse {
Html("<h1>ANY Pong!</h1>").into_response()
}

View file

@ -1,5 +1,5 @@
use axum::{extract::Path, response::IntoResponse};
pub async fn get(Path(id): Path<String>) -> impl IntoResponse {
format!("User ID: {}", id)
format!("User ID: {id}")
}

View file

@ -6,17 +6,18 @@ struct AppState {
_foo: String,
}
// Imports route.rs files & generates an init fn
folder_router!("examples/advanced/api", AppState);
// Imports route.rs files & generates an ::into_router() fn
#[folder_router("examples/advanced/api", AppState)]
struct MyFolderRouter();
pub async fn server() -> anyhow::Result<()> {
// Create app state
let app_state = AppState {
_foo: "".to_string(),
_foo: String::new(),
};
// Use the init fn generated above
let folder_router: Router<AppState> = folder_router();
let folder_router: Router<AppState> = MyFolderRouter::into_router();
// Build the router and provide the state
let app: Router<()> = folder_router.with_state(app_state);

View file

@ -1,23 +1,20 @@
use axum::Router;
use axum_folder_router::folder_router;
#[derive(Clone, Debug)]
struct AppState {
_foo: String,
}
#[derive(Clone)]
struct AppState;
// Imports route.rs files & generates an init fn
folder_router!("./examples/simple/api", AppState);
// Imports route.rs files & generates an ::into_router() fn
#[folder_router("./examples/simple/api", AppState)]
struct MyFolderRouter();
#[tokio::main]
async fn main() -> anyhow::Result<()> {
// Create app state
let app_state = AppState {
_foo: "".to_string(),
};
let app_state = AppState;
// Use the init fn generated above
let folder_router: Router<AppState> = folder_router();
let folder_router: Router<AppState> = MyFolderRouter::into_router();
// Build the router and provide the state
let app: Router<()> = folder_router.with_state(app_state);

View file

@ -73,6 +73,7 @@
cargo-outdated
cargo-release
cargo-readme
cargo-expand
calc
fish
inotify-tools
@ -93,7 +94,8 @@
packages = {
# default = pkgs.callPackage ./package.nix { };
};
}) // {
})
// {
hydraJobs =
let
system = "x86_64-linux";

234
src/generate.rs Normal file
View file

@ -0,0 +1,234 @@
use std::{collections::BTreeMap, fmt::Write, path::Path};
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use syn::LitStr;
use crate::parse::methods_for_route;
// A struct representing a directory in the module tree
#[derive(Debug)]
struct ModuleDir {
name: String,
has_route: bool,
children: BTreeMap<String, ModuleDir>,
}
impl ModuleDir {
fn new(name: &str) -> Self {
ModuleDir {
name: name.to_string(),
has_route: false,
children: BTreeMap::new(),
}
}
fn add_to_module_tree(&mut self, rel_path: &Path, _route_path: &Path) {
let components: Vec<_> = rel_path
.components()
.map(|c| c.as_os_str().to_string_lossy().to_string())
.collect();
if components.is_empty() {
self.has_route = true;
return;
}
let mut root = self;
for (i, segment) in components.iter().enumerate() {
if i == components.len() - 1 && segment == "route.rs" {
root.has_route = true;
break;
}
root = root
.children
.entry(segment.clone())
.or_insert_with(|| ModuleDir::new(segment));
}
}
}
// Add a route to the module tree
// Normalize a path segment for use as a module name
fn normalize_module_name(name: &str) -> String {
if name.starts_with('[') && name.ends_with(']') {
let inner = &name[1..name.len() - 1];
if let Some(stripped) = inner.strip_prefix("...") {
format!("___{stripped}")
} else {
format!("__{inner}")
}
} else {
name.replace(['-', '.'], "_")
}
}
// Convert a relative path to module path segments and axum route path
fn path_to_module_path(rel_path: &Path) -> (String, Vec<String>) {
let mut axum_path = String::new();
let mut mod_path = Vec::new();
let components: Vec<_> = rel_path
.components()
.map(|c| c.as_os_str().to_string_lossy().to_string())
.collect();
// Handle root route
if components.is_empty() {
return ("/".to_string(), vec!["route".to_string()]);
}
for (i, segment) in components.iter().enumerate() {
if i == components.len() - 1 && segment == "route.rs" {
mod_path.push("route".to_string());
} else {
// Process directory name
let normalized = normalize_module_name(segment);
mod_path.push(normalized);
// Process URL path
if segment.starts_with('[') && segment.ends_with(']') {
let param = &segment[1..segment.len() - 1];
if let Some(stripped) = param.strip_prefix("...") {
write!(&mut axum_path, "/{{*{stripped}}}").unwrap();
} else {
write!(&mut axum_path, "/{{:{param}}}").unwrap();
}
} else {
write!(&mut axum_path, "/{segment}").unwrap();
}
}
}
if axum_path.is_empty() {
axum_path = "/".to_string();
}
(axum_path, mod_path)
}
// Generate tokens for a module path
fn generate_mod_path_tokens(mod_path: &[String]) -> TokenStream {
let mut result = TokenStream::new();
for (i, segment) in mod_path.iter().enumerate() {
let segment_ident = format_ident!("{}", segment);
if i == 0 {
result = quote! { #segment_ident };
} else {
result = quote! { #result::#segment_ident };
}
}
result
}
// Generate module hierarchy code
fn generate_module_hierarchy(dir: &ModuleDir) -> TokenStream {
let mut result = TokenStream::new();
// Add route.rs module if this directory has one
if dir.has_route {
let route_mod = quote! {
#[path = "route.rs"]
pub mod route;
};
result.extend(route_mod);
}
// Add subdirectories
for child in dir.children.values() {
let child_name = format_ident!("{}", normalize_module_name(&child.name));
let child_path_lit = LitStr::new(&child.name, proc_macro2::Span::call_site());
let child_content = generate_module_hierarchy(child);
let child_mod = quote! {
#[path = #child_path_lit]
pub mod #child_name {
#child_content
}
};
result.extend(child_mod);
}
result
}
pub fn route_registrations(
root_namespace_str: &str,
routes: &Vec<(std::path::PathBuf, std::path::PathBuf)>,
) -> TokenStream {
let root_namespace_ident = format_ident!("{}", root_namespace_str);
let mut route_registrations = Vec::new();
for (route_path, rel_path) in routes {
// Generate module path and axum path
let (axum_path, mod_path) = path_to_module_path(rel_path);
let method_registrations = methods_for_route(route_path);
if !method_registrations.is_empty() {
let first_method = &method_registrations[0];
let first_method_ident = format_ident!("{}", first_method);
let mod_path_tokens = generate_mod_path_tokens(&mod_path);
let mut builder = quote! {
axum::routing::#first_method_ident(#root_namespace_ident::#mod_path_tokens::#first_method_ident)
};
for method in &method_registrations[1..] {
let method_ident = format_ident!("{}", method);
builder = quote! {
#builder.#method_ident(#root_namespace_ident::#mod_path_tokens::#method_ident)
};
}
let registration = quote! {
router = router.route(#axum_path, #builder);
};
route_registrations.push(registration);
}
}
if route_registrations.is_empty() {
return quote! {
compile_error!(concat!(
"No routes defined in your route.rs's !\n",
"Ensure that at least one `pub async fn` named after an HTTP verb is defined. (e.g. get, post, put, delete)"
));
};
}
TokenStream::from_iter(route_registrations)
}
pub fn module_tree(
root_namespace_str: &str,
base_dir: &Path,
routes: &Vec<(std::path::PathBuf, std::path::PathBuf)>,
) -> TokenStream {
let root_namespace_ident = format_ident!("{}", root_namespace_str);
let base_path_lit = LitStr::new(
base_dir.to_str().unwrap_or("./"),
proc_macro2::Span::call_site(),
);
let mut root = ModuleDir::new(root_namespace_str);
for (route_path, rel_path) in routes {
root.add_to_module_tree(rel_path, route_path);
}
let mod_hierarchy = generate_module_hierarchy(&root);
quote! {
#[path = #base_path_lit]
mod #root_namespace_ident {
#mod_hierarchy
}
}
}

View file

@ -1,6 +1,6 @@
//! # ```axum_folder_router``` Macro Documentation
//!
//! [folder_router!] is a procedural macro for the Axum web framework that
//! [macro@folder_router] is a procedural macro for the Axum web framework that
//! automatically generates router boilerplate based on your file structure. It
//! simplifies route organization by using filesystem conventions to define your
//! API routes.
@ -11,7 +11,7 @@
//!
//! ```toml
//! [dependencies]
//! axum_folder_router = "0.2"
//! axum_folder_router = "0.3"
//! axum = "0.8"
//! ```
//!
@ -54,7 +54,7 @@
//!
//! ### HTTP Methods
//!
//! The macro supports all standard HTTP methods:
//! The macro supports all standard HTTP methods as defined in RFC9110.
//! - ```get```
//! - ```post```
//! - ```put```
@ -62,6 +62,11 @@
//! - ```patch```
//! - ```head```
//! - ```options```
//! - ```trace```
//! - ```connect```
//!
//! And additionally
//! - ```any```, which maches all methods
//!
//! ### Path Parameters
//!
@ -122,367 +127,96 @@
//! - **Compile-time Only**: The routing is determined at compile time, so dynamic route registration isn't supported.
//! - **Expects seperate directory**: To make rust-analyzer & co work correctly the macro imports all route.rs files inside the given directory tree.
//! It is highly recommended to keep the route directory seperate from the rest of your module-tree.
use std::{
collections::HashMap,
fs,
path::{Path, PathBuf},
};
use std::path::Path;
use proc_macro::TokenStream;
use quote::{format_ident, quote};
use syn::{
Ident,
Item,
LitStr,
Result,
Token,
Visibility,
parse::{Parse, ParseStream},
parse_file,
parse_macro_input,
};
use quote::quote;
use syn::parse_macro_input;
struct FolderRouterArgs {
path: String,
state_type: Ident,
}
impl Parse for FolderRouterArgs {
fn parse(input: ParseStream) -> Result<Self> {
let path_lit = input.parse::<LitStr>()?;
input.parse::<Token![,]>()?;
let state_type = input.parse::<Ident>()?;
Ok(FolderRouterArgs {
path: path_lit.value(),
state_type,
})
}
}
// A struct representing a directory in the module tree
#[derive(Debug)]
struct ModuleDir {
name: String,
has_route: bool,
children: HashMap<String, ModuleDir>,
}
impl ModuleDir {
fn new(name: &str) -> Self {
ModuleDir {
name: name.to_string(),
has_route: false,
children: HashMap::new(),
}
}
}
mod generate;
mod parse;
/// Creates an Axum router module tree & creation function
/// by scanning a directory for `route.rs` files.
///
/// # Parameters
///
/// * `path` - A string literal pointing to the API directory, relative to the
/// * `path` - A string literal pointing to the route directory, relative to the
/// Cargo manifest directory
/// * `state_type` - The type name of your application state that will be shared
/// across all routes
///
/// This will scan all `route.rs` files in the `./src/api` directory and its
/// subdirectories, automatically mapping their path structure to URL routes
/// with the specified state type.
#[proc_macro]
pub fn folder_router(input: TokenStream) -> TokenStream {
let args = parse_macro_input!(input as FolderRouterArgs);
#[allow(clippy::missing_panics_doc)]
#[proc_macro_attribute]
pub fn folder_router(attr: TokenStream, item: TokenStream) -> TokenStream {
let args = parse_macro_input!(attr as parse::FolderRouterArgs);
let input_item = parse_macro_input!(item as syn::ItemStruct);
let struct_name = &input_item.ident;
let base_path = args.path;
let state_type = args.state_type;
// Get the project root directory
let manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
let manifest_dir = get_manifest_dir();
let base_dir = Path::new(&manifest_dir).join(&base_path);
// Collect route files
let mut routes = Vec::new();
collect_route_files(&base_dir, &base_dir, &mut routes);
let mod_namespace = format!(
"__folder_router__{}__{}",
struct_name
.to_string()
.chars()
.map(|c| if c.is_alphanumeric() { c } else { '_' })
.map(|c| c.to_ascii_lowercase())
.collect::<String>(),
base_path
.chars()
.map(|c| if c.is_alphanumeric() { c } else { '_' })
.collect::<String>()
);
let routes = parse::collect_route_files(&base_dir, &base_dir);
if routes.is_empty() {
return TokenStream::from(quote! {
compile_error!(concat!("No route.rs files found in the specified directory: ",
compile_error!(concat!("No route.rs files found in the specified directory: '",
#base_path,
". Make sure the path is correct and contains route.rs files."
"'. Make sure the path is correct and contains route.rs files."
));
});
}
// Build module tree
let mut root = ModuleDir::new("__folder_router");
for (route_path, rel_path) in &routes {
add_to_module_tree(&mut root, rel_path, route_path);
}
let module_tree = generate::module_tree(&mod_namespace, &base_dir, &routes);
let route_registrations = generate::route_registrations(&mod_namespace, &routes);
// Generate module tree
let root_mod_ident = format_ident!("{}", root.name);
quote! {
#module_tree
let base_path_lit = LitStr::new(base_dir.to_str().unwrap(), proc_macro2::Span::call_site());
let mod_hierarchy = generate_module_hierarchy(&root);
#input_item
// Generate route registrations
let mut route_registrations = Vec::new();
for (route_path, rel_path) in routes {
// Generate module path and axum path
let (axum_path, mod_path) = path_to_module_path(&rel_path);
let method_registrations = methods_for_route(&route_path);
if method_registrations.is_empty() {
return TokenStream::from(quote! {
compile_error!(concat!("No routes defined in '",
#base_path
"', make sure to define at least one `pub async fn` named after an method. (E.g. get, post, put, delete)"
));
});
}
let first_method = &method_registrations[0];
let first_method_ident = format_ident!("{}", first_method);
let mod_path_tokens = generate_mod_path_tokens(&mod_path);
let mut builder = quote! {
axum::routing::#first_method_ident(#root_mod_ident::#mod_path_tokens::#first_method_ident)
};
for method in &method_registrations[1..] {
let method_ident = format_ident!("{}", method);
builder = quote! {
#builder.#method_ident(#root_mod_ident::#mod_path_tokens::#method_ident)
};
}
let registration = quote! {
router = router.route(#axum_path, #builder);
};
route_registrations.push(registration);
}
// Generate the final code
let expanded = quote! {
#[path = #base_path_lit]
mod #root_mod_ident {
#mod_hierarchy
}
pub fn folder_router() -> axum::Router<#state_type> {
impl #struct_name {
pub fn into_router() -> axum::Router<#state_type> {
let mut router = axum::Router::new();
#(#route_registrations)*
#route_registrations
router
}
};
expanded.into()
}
}
.into()
}
/// parses the file at the specified location using syn
/// and returns a Vec<&'static str> of all used http verb fns
/// e.g. for the file
///
/// ```rust
/// pub async fn get() {} # ✅ => "get" be added to vec
/// pub fn post() {} # not async
/// async fn delete() {} # not pub
/// fn patch() {} # not pub nor async
/// pub fn non_verb() {} # not a http verb
/// ```
///
/// it returns: `vec!["get"]`
fn methods_for_route(route_path: &PathBuf) -> Vec<&'static str> {
// Read the file content
let file_content = match fs::read_to_string(route_path) {
Ok(content) => content,
Err(_) => return Vec::new(),
};
// This is a workaround for macrotest behaviour
#[cfg(debug_assertions)]
fn get_manifest_dir() -> String {
use regex::Regex;
let dir = std::env::var("CARGO_MANIFEST_DIR").unwrap_or("./".to_string());
let re = Regex::new(r"^(.+)/target/tests/axum-folder-router/[A-Za-z0-9]{42}$").unwrap();
// Parse the file content into a syn syntax tree
let file = match parse_file(&file_content) {
Ok(file) => file,
Err(_) => return Vec::new(),
};
// Define HTTP methods we're looking for
let methods = ["get", "post", "put", "delete", "patch", "head", "options"];
let mut found_methods = Vec::new();
// Examine each item in the file
for item in &file.items {
if let Item::Fn(fn_item) = item {
let fn_name = fn_item.sig.ident.to_string();
// Check if the function name is one of our HTTP methods
if let Some(&method) = methods.iter().find(|&&m| m == fn_name) {
// Check if the function is public
let is_public = matches!(fn_item.vis, Visibility::Public(_));
// Check if the function is async
let is_async = fn_item.sig.asyncness.is_some();
if is_public && is_async {
found_methods.push(method);
}
}
}
}
found_methods
}
// Add a route to the module tree
fn add_to_module_tree(root: &mut ModuleDir, rel_path: &Path, _route_path: &Path) {
let components: Vec<_> = rel_path
.components()
.map(|c| c.as_os_str().to_string_lossy().to_string())
.collect();
if components.is_empty() {
root.has_route = true;
return;
}
let mut root = root;
for (i, segment) in components.iter().enumerate() {
if i == components.len() - 1 && segment == "route.rs" {
root.has_route = true;
break;
}
root = root
.children
.entry(segment.clone())
.or_insert_with(|| ModuleDir::new(segment));
}
}
// Generate module hierarchy code
fn generate_module_hierarchy(dir: &ModuleDir) -> proc_macro2::TokenStream {
let mut result = proc_macro2::TokenStream::new();
// Add route.rs module if this directory has one
if dir.has_route {
let route_mod = quote! {
#[path = "route.rs"]
pub mod route;
};
result.extend(route_mod);
}
// Add subdirectories
for child in dir.children.values() {
let child_name = format_ident!("{}", normalize_module_name(&child.name));
let child_path_lit = LitStr::new(&child.name, proc_macro2::Span::call_site());
let child_content = generate_module_hierarchy(child);
let child_mod = quote! {
#[path = #child_path_lit]
pub mod #child_name {
#child_content
}
};
result.extend(child_mod);
}
result
}
// Generate tokens for a module path
fn generate_mod_path_tokens(mod_path: &[String]) -> proc_macro2::TokenStream {
let mut result = proc_macro2::TokenStream::new();
for (i, segment) in mod_path.iter().enumerate() {
let segment_ident = format_ident!("{}", segment);
if i == 0 {
result = quote! { #segment_ident };
if let Some(captures) = re.captures(&dir) {
captures.get(1).unwrap().as_str().to_string()
} else {
result = quote! { #result::#segment_ident };
}
}
result
}
// Normalize a path segment for use as a module name
fn normalize_module_name(name: &str) -> String {
if name.starts_with('[') && name.ends_with(']') {
let inner = &name[1..name.len() - 1];
if let Some(stripped) = inner.strip_prefix("...") {
format!("___{}", stripped)
} else {
format!("__{}", inner)
}
} else {
name.replace(['-', '.'], "_")
dir
}
}
// Convert a relative path to module path segments and axum route path
fn path_to_module_path(rel_path: &Path) -> (String, Vec<String>) {
let mut axum_path = String::new();
let mut mod_path = Vec::new();
let components: Vec<_> = rel_path
.components()
.map(|c| c.as_os_str().to_string_lossy().to_string())
.collect();
// Handle root route
if components.is_empty() {
return ("/".to_string(), vec!["route".to_string()]);
}
for (i, segment) in components.iter().enumerate() {
if i == components.len() - 1 && segment == "route.rs" {
mod_path.push("route".to_string());
} else {
// Process directory name
let normalized = normalize_module_name(segment);
mod_path.push(normalized);
// Process URL path
if segment.starts_with('[') && segment.ends_with(']') {
let param = &segment[1..segment.len() - 1];
if let Some(stripped) = param.strip_prefix("...") {
axum_path.push_str(&format!("/{{*{}}}", stripped));
} else {
axum_path.push_str(&format!("/{{:{}}}", param));
}
} else {
axum_path.push_str(&format!("/{}", segment));
}
}
}
if axum_path.is_empty() {
axum_path = "/".to_string();
}
(axum_path, mod_path)
}
// Collect route.rs files recursively
fn collect_route_files(base_dir: &Path, dir: &Path, routes: &mut Vec<(PathBuf, PathBuf)>) {
if let Ok(entries) = fs::read_dir(dir) {
for entry in entries.filter_map(std::result::Result::ok) {
let path = entry.path();
if path.is_dir() {
collect_route_files(base_dir, &path, routes);
} else if path.file_name().unwrap_or_default() == "route.rs" {
if let Ok(rel_dir) = path.strip_prefix(base_dir) {
routes.push((path.clone(), rel_dir.to_path_buf()));
}
}
}
}
#[cfg(not(debug_assertions))]
fn get_manifest_dir() -> String {
std::env::var("CARGO_MANIFEST_DIR").unwrap_or("./".to_string())
}

98
src/parse.rs Normal file
View file

@ -0,0 +1,98 @@
use std::{
fs,
path::{Path, PathBuf},
};
use syn::{
parse::{Parse, ParseStream},
parse_file,
Ident,
Item,
LitStr,
Result,
Token,
Visibility,
};
#[derive(Debug)]
pub struct FolderRouterArgs {
pub path: String,
pub state_type: Ident,
}
impl Parse for FolderRouterArgs {
fn parse(input: ParseStream) -> Result<Self> {
let path_lit = input.parse::<LitStr>()?;
input.parse::<Token![,]>()?;
let state_type = input.parse::<Ident>()?;
Ok(FolderRouterArgs {
path: path_lit.value(),
state_type,
})
}
}
/// Parses the file at the specified location and returns HTTP verb functions
pub fn methods_for_route(route_path: &PathBuf) -> Vec<&'static str> {
// Read the file content
let Ok(file_content) = fs::read_to_string(route_path) else {
return Vec::new();
};
// Parse the file content into a syn syntax tree
let Ok(file) = parse_file(&file_content) else {
return Vec::new();
};
// Define HTTP methods we're looking for
let allowed_methods = [
"any", "get", "post", "put", "delete", "patch", "head", "options", "trace", "connect",
];
let mut found_methods = Vec::new();
// Collect all pub & async fn's
for item in &file.items {
if let Item::Fn(fn_item) = item {
let fn_name = fn_item.sig.ident.to_string();
let is_public = matches!(fn_item.vis, Visibility::Public(_));
let is_async = fn_item.sig.asyncness.is_some();
if is_public && is_async {
found_methods.push(fn_name);
}
}
}
// Iterate through methods to ensure consistent order
allowed_methods
.into_iter()
.filter(|elem| {
found_methods
.clone()
.into_iter()
.any(|method| method == *elem)
})
.collect()
}
// Collect route.rs files recursively
pub fn collect_route_files(base_dir: &Path, dir: &Path) -> Vec<(PathBuf, PathBuf)> {
let mut routes = Vec::new();
if let Ok(entries) = fs::read_dir(dir) {
for entry in entries.filter_map(std::result::Result::ok) {
let path = entry.path();
if path.is_dir() {
let mut nested_routes = collect_route_files(base_dir, &path);
routes.append(&mut nested_routes);
} else if path.file_name().unwrap_or_default() == "route.rs" {
if let Ok(rel_dir) = path.strip_prefix(base_dir) {
routes.push((path.clone(), rel_dir.to_path_buf()));
}
}
}
}
routes.sort();
routes
}

4
tests/expand.rs Normal file
View file

@ -0,0 +1,4 @@
#[test]
pub fn expand_snapshot_pass() {
macrotest::expand("tests/expand/*.rs");
}

View file

@ -0,0 +1,155 @@
use axum_folder_router::folder_router;
struct AppState {
_foo: String,
}
#[automatically_derived]
impl ::core::clone::Clone for AppState {
#[inline]
fn clone(&self) -> AppState {
AppState {
_foo: ::core::clone::Clone::clone(&self._foo),
}
}
}
#[path = "/home/tristand/code/axum-folder-router/examples/advanced/api"]
mod __folder_router__myfolderrouter__examples_advanced_api {
#[path = "route.rs"]
pub mod route {
use axum::response::{Html, IntoResponse};
pub async fn get() -> impl IntoResponse {
Html("<h1>Hello World!</h1>").into_response()
}
pub async fn post() -> impl IntoResponse {
"Posted successfully".into_response()
}
}
#[path = "files"]
pub mod files {
#[path = "route.rs"]
pub mod route {
use axum::response::{Html, IntoResponse};
pub async fn get() -> impl IntoResponse {
Html("<h1>Hello World!</h1>").into_response()
}
pub async fn post() -> impl IntoResponse {
"Posted successfully".into_response()
}
}
#[path = "[...path]"]
pub mod ___path {
#[path = "route.rs"]
pub mod route {
use axum::{extract::Path, response::IntoResponse};
pub async fn get(Path(path): Path<String>) -> impl IntoResponse {
::alloc::__export::must_use({
let res = ::alloc::fmt::format(
format_args!("Requested file path: {0}", path),
);
res
})
}
}
}
}
#[path = "ping"]
pub mod ping {
#[path = "route.rs"]
pub mod route {
use axum::response::Html;
use axum::response::IntoResponse;
pub async fn get() -> impl IntoResponse {
Html("<h1>GET Pong!</h1>").into_response()
}
pub async fn any() -> impl IntoResponse {
Html("<h1>ANY Pong!</h1>").into_response()
}
}
}
#[path = "users"]
pub mod users {
#[path = "route.rs"]
pub mod route {
use axum::response::{Html, IntoResponse};
pub async fn get() -> impl IntoResponse {
Html("<h1>Hello World!</h1>").into_response()
}
pub async fn post() -> impl IntoResponse {
"Posted successfully".into_response()
}
}
#[path = "[id]"]
pub mod __id {
#[path = "route.rs"]
pub mod route {
use axum::{extract::Path, response::IntoResponse};
pub async fn get(Path(id): Path<String>) -> impl IntoResponse {
::alloc::__export::must_use({
let res = ::alloc::fmt::format(format_args!("User ID: {0}", id));
res
})
}
}
}
}
}
struct MyFolderRouter();
impl MyFolderRouter {
pub fn into_router() -> axum::Router<AppState> {
let mut router = axum::Router::new();
router = router
.route(
"/files/{*path}",
axum::routing::get(
__folder_router__myfolderrouter__examples_advanced_api::files::___path::route::get,
),
);
router = router
.route(
"/files",
axum::routing::get(
__folder_router__myfolderrouter__examples_advanced_api::files::route::get,
)
.post(
__folder_router__myfolderrouter__examples_advanced_api::files::route::post,
),
);
router = router
.route(
"/ping",
axum::routing::any(
__folder_router__myfolderrouter__examples_advanced_api::ping::route::any,
)
.get(
__folder_router__myfolderrouter__examples_advanced_api::ping::route::get,
),
);
router = router
.route(
"/",
axum::routing::get(
__folder_router__myfolderrouter__examples_advanced_api::route::get,
)
.post(
__folder_router__myfolderrouter__examples_advanced_api::route::post,
),
);
router = router
.route(
"/users/{:id}",
axum::routing::get(
__folder_router__myfolderrouter__examples_advanced_api::users::__id::route::get,
),
);
router = router
.route(
"/users",
axum::routing::get(
__folder_router__myfolderrouter__examples_advanced_api::users::route::get,
)
.post(
__folder_router__myfolderrouter__examples_advanced_api::users::route::post,
),
);
router
}
}

9
tests/expand/advanced.rs Normal file
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@ -0,0 +1,9 @@
use axum_folder_router::folder_router;
#[derive(Clone)]
struct AppState {
_foo: String,
}
#[folder_router("examples/advanced/api", AppState)]
struct MyFolderRouter();

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@ -0,0 +1,33 @@
use axum_folder_router::folder_router;
struct AppState;
#[automatically_derived]
impl ::core::clone::Clone for AppState {
#[inline]
fn clone(&self) -> AppState {
AppState
}
}
#[path = "/home/tristand/code/axum-folder-router/examples/simple/api"]
mod __folder_router__myfolderrouter__examples_simple_api {
#[path = "route.rs"]
pub mod route {
use axum::response::{Html, IntoResponse};
pub async fn get() -> impl IntoResponse {
Html("<h1>Hello World!</h1>").into_response()
}
}
}
struct MyFolderRouter();
impl MyFolderRouter {
pub fn into_router() -> axum::Router<AppState> {
let mut router = axum::Router::new();
router = router
.route(
"/",
axum::routing::get(
__folder_router__myfolderrouter__examples_simple_api::route::get,
),
);
router
}
}

7
tests/expand/simple.rs Normal file
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@ -0,0 +1,7 @@
use axum_folder_router::folder_router;
#[derive(Clone)]
struct AppState;
#[folder_router("examples/simple/api", AppState)]
struct MyFolderRouter();

5
tests/failures.rs Normal file
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@ -0,0 +1,5 @@
#[test]
fn ui() {
let t = trybuild::TestCases::new();
t.compile_fail("tests/failures/*.rs");
}

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@ -0,0 +1,9 @@
use axum_folder_router::folder_router;
#[derive(Clone)]
struct AppState;
#[folder_router("some/non/existing/directory", AppState)]
struct MyFolderRouter();
fn main() {}

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@ -0,0 +1,7 @@
error: No route.rs files found in the specified directory: 'some/non/existing/directory'. Make sure the path is correct and contains route.rs files.
--> tests/failures/no_files.rs:6:1
|
6 | #[folder_router("some/non/existing/directory", AppState)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in the attribute macro `folder_router` (in Nightly builds, run with -Z macro-backtrace for more info)

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@ -0,0 +1,9 @@
use axum_folder_router::folder_router;
#[derive(Clone)]
struct AppState;
#[folder_router("../../../../tests/failures/no_routes", AppState)]
struct MyFolderRouter();
fn main() {}

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@ -0,0 +1,8 @@
error: No routes defined in your route.rs's !
Ensure that at least one `pub async fn` named after an HTTP verb is defined. (e.g. get, post, put, delete)
--> tests/failures/no_routes.rs:6:1
|
6 | #[folder_router("../../../../tests/failures/no_routes", AppState)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in the attribute macro `folder_router` (in Nightly builds, run with -Z macro-backtrace for more info)

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