Make derive optional

This is the same as in e.g. `serde` with the feature of the same name.
If you manually depend on `rinja_derive`, then you can make better use
of your multi-core setup.

Author: Kijewski

.github/workflows/rust.yml

@@ -26,7 +26,7 @@ jobs:
       - run: |
           set -eu
           for PKG in \
-            examples/actix-web-app examples/axum-app examples/poem-app examples/rocket-app examples/salvo-app examples/warp-app fuzzing \
+            bench-build examples/actix-web-app examples/axum-app examples/poem-app examples/rocket-app examples/salvo-app examples/warp-app fuzzing \
             rinja rinja_derive rinja_derive_standalone rinja_parser \
             testing testing-alloc testing-no-std testing-renamed
           do
@@ -116,7 +116,7 @@ jobs:
           cargo sort --check --check-format --grouped
           set -eu
           for PKG in \
-            examples/actix-web-app examples/axum-app examples/poem-app examples/rocket-app examples/salvo-app examples/warp-app fuzzing \
+            bench-build examples/actix-web-app examples/axum-app examples/poem-app examples/rocket-app examples/salvo-app examples/warp-app fuzzing \
             rinja rinja_derive rinja_derive_standalone rinja_parser \
             testing testing-alloc testing-no-std testing-renamed
           do
@@ -159,7 +159,7 @@ jobs:
     strategy:
       matrix:
         package: [
-          examples/actix-web-app, examples/axum-app, examples/poem-app, examples/rocket-app, examples/salvo-app, examples/warp-app, fuzzing,
+          bench-build, examples/actix-web-app, examples/axum-app, examples/poem-app, examples/rocket-app, examples/salvo-app, examples/warp-app, fuzzing,
           rinja, rinja_derive, rinja_derive_standalone, rinja_parser,
           testing, testing-alloc, testing-no-std, testing-renamed,
         ]

bench-build/.rustfmt.toml

@@ -0,0 +1 @@
+../.rustfmt.toml

bench-build/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "bench-build"
+version = "0.3.5"
+authors = ["rinja-rs developers"]
+edition = "2021"
+rust-version = "1.81"
+publish = false
+
+[dependencies]
+rinja = { path = "../rinja", version = "0.3.5", default-features = false, features = ["std"] }
+rinja_derive = { path = "../rinja_derive", version = "0.3.5", features = ["std"] }
+
+[features]
+default = []
+derive = ["rinja/derive"]
+
+[workspace]
+members = ["."]

bench-build/LICENSE-APACHE

@@ -0,0 +1 @@
+../LICENSE-APACHE

bench-build/LICENSE-MIT

@@ -0,0 +1 @@
+../LICENSE-MIT

bench-build/README.md

@@ -0,0 +1,55 @@
+Run the script `./run.sh` in this directory to compare the compile compile if `rinja`
+
+* uses feature `derive` vs
+* it does not use that feature.
+
+The output might look like:
+
+```text
+Benchmark 1: cargo run --features=derive
+  Time (mean ± σ):      3.378 s ±  0.041 s    [User: 7.944 s, System: 1.018 s]
+  Range (min … max):    3.345 s …  3.424 s    3 runs
+ 
+Benchmark 2: cargo run
+  Time (mean ± σ):      3.283 s ±  0.130 s    [User: 8.400 s, System: 1.091 s]
+  Range (min … max):    3.141 s …  3.398 s    3 runs
+ 
+Summary
+  cargo run ran
+    1.03 ± 0.04 times faster than cargo run --features=derive
+
+----------
+
+Benchmark 1: cargo run --release --features=derive
+  Time (mean ± σ):      4.733 s ±  0.050 s    [User: 9.026 s, System: 0.749 s]
+  Range (min … max):    4.689 s …  4.788 s    3 runs
+ 
+Benchmark 2: cargo run --release
+  Time (mean ± σ):      4.504 s ±  0.032 s    [User: 9.010 s, System: 0.733 s]
+  Range (min … max):    4.481 s …  4.541 s    3 runs
+ 
+Summary
+  cargo run --release ran
+    1.05 ± 0.01 times faster than cargo run --release --features=derive
+```
+
+This shows that – while it is less convenient – for small projects it might be better
+to use the following setup.
+This might be especially true if you are using `rinja` in a library.
+Without the feature, `cargo` will be able to compile more dependencies in parallel.
+
+```toml
+# Cargo.toml
+[dependencies]
+rinja = { version = "0.3.5", default-features = false, features = ["std"] }
+rinja_derive = { version = "0.3.5", features = ["std"] }
+```
+
+```rust
+// lib.rs
+use rinja::Template as _;
+use rinja_derive::Template;
+```
+
+The script uses [hyperfine](https://crates.io/crates/hyperfine).
+Install it with `cargo install hyperfine`.

bench-build/_typos.toml

@@ -0,0 +1 @@
+../_typos.toml

bench-build/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

bench-build/deny.toml

@@ -0,0 +1 @@
+../deny.toml

bench-build/run.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+mkdir -p target
+hyperfine \
+    --runs=3 \
+    --warmup=1 \
+    --prepare='rm -r target' \
+    'cargo run --features=derive' \
+    'cargo run'
+echo
+echo ----------
+echo
+hyperfine \
+    --runs=3 \
+    --warmup=1 \
+    --prepare='rm -r target' \
+    'cargo run --release --features=derive' \
+    'cargo run --release'

bench-build/src/main.rs

@@ -0,0 +1,47 @@
+use std::str::FromStr;
+
+use rinja::Template as _;
+use rinja_derive::Template;
+
+fn main() {
+    let mut args = std::env::args().fuse().skip(1);
+    let greeting = args.next();
+    let user = args.next();
+
+    let tmpl = HelloWorld {
+        greeting: greeting.as_deref().unwrap_or("hi").parse().unwrap(),
+        user: user.as_deref().unwrap_or("user"),
+    };
+    println!("{}", tmpl.render().unwrap());
+}
+
+#[derive(Debug, Clone, Copy, Template)]
+#[template(path = "hello_world.html")]
+struct HelloWorld<'a> {
+    greeting: Greeting,
+    user: &'a str,
+}
+
+#[derive(Debug, Clone, Copy, Template)]
+#[template(path = "greeting.html")]
+enum Greeting {
+    #[template(block = "hello")]
+    Hello,
+    #[template(block = "hey")]
+    Hey,
+    #[template(block = "hi")]
+    Hi,
+}
+
+impl FromStr for Greeting {
+    type Err = &'static str;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "hello" => Ok(Self::Hello),
+            "hey" => Ok(Self::Hey),
+            "hi" => Ok(Self::Hi),
+            _ => Err("Valid greetings: <hello | hey | hi>"),
+        }
+    }
+}

bench-build/templates/greeting.html

@@ -0,0 +1,11 @@
+{%- block hello -%}
+    Hello
+{%- endblock -%}
+
+{%- block hey -%}
+    Hey
+{%- endblock -%}
+
+{%- block hi -%}
+    Hi
+{%- endblock -%}

bench-build/templates/hello_world.html

@@ -0,0 +1 @@
+<h1>{{greeting}}, {{user}}!</h1>

bench-build/tomlfmt.toml

@@ -0,0 +1 @@
+../tomlfmt.toml

book/src/features.md

@@ -35,7 +35,7 @@ Without `default-features = false`, i.e with default features enabled,
 the following features are automatically selected for you:
 
 ```toml
-default = ["config", "std", "urlencode"]
+default = ["config", "derive", "std", "urlencode"]
 ```
 
 This should encompass most features an average user of rinja might need.
@@ -44,6 +44,24 @@ This should encompass most features an average user of rinja might need.
 and if you want it to be usable in by other users and in **other projects**,
 then you should probably **opt-out of features you do not need**.*
 
+### `"derive"`
+
+<blockquote class="right" style="padding:0.5ex 1ex; margin:0 0 1ex 1ex; font-size:80%">
+enabled by <code>"default"</code>
+</blockquote>
+
+This feature enables `#[derive(Template)]`. Without it the trait `rinja::Template` will still be
+available, but if you want to derive a template, you have to manually depend on `rinja_derive`.
+`rinja_derive` should be used with the same features as `rinja`.
+
+Not using this feature might be useful e.g. if you are writing a library with manual filters
+for rinja, without any templates. It might also very slightly speed-up the compilation,
+because more dependencies can be compiled in parallel, because `rinja` won't transitively depend
+on e.g. `syn` or `proc-macro2`. On the author's PC the compilation of a trivial hello-world example
+was about 0.2s faster without the feature when compiled in release mode.
+
+*If you are writing a library that uses rinja, consider **not using** this default-feature.*
+
 ### `"config"`
 
 <blockquote class="right" style="padding:0.5ex 1ex; margin:0 0 1ex 1ex; font-size:80%">

rinja/Cargo.toml

@@ -24,13 +24,14 @@ name = "escape"
 harness = false
 
 [dependencies]
-rinja_derive = { version = "=0.3.5", path = "../rinja_derive" }
-
 itoa = "1.0.11"
 
+# needed by feature "derive"
+rinja_derive = { version = "=0.3.5", path = "../rinja_derive", default-features = false, optional = true }
+
 # needed by feature "serde_json"
 serde = { version = "1.0", optional = true, default-features = false }
-serde_json = { version = "1.0", optional = true, default-features = false, features = [] }
+serde_json = { version = "1.0", optional = true, default-features = false }
 
 # needed by feature "urlencode"
 percent-encoding = { version = "2.1.0", optional = true, default-features = false }
@@ -43,24 +44,25 @@ criterion = "0.5"
 maintenance = { status = "actively-developed" }
 
 [features]
-default = ["config", "std", "urlencode"]
-full = ["default", "blocks", "code-in-doc", "serde_json"]
+default = ["config", "derive", "std", "urlencode", "rinja_derive?/default"]
+full = ["default", "blocks", "code-in-doc", "serde_json", "rinja_derive?/full"]
 
 alloc = [
-    "rinja_derive/alloc",
+    "rinja_derive?/alloc",
     "serde?/alloc",
     "serde_json?/alloc",
-    "percent-encoding?/alloc"
+    "percent-encoding?/alloc",
 ]
-blocks = ["rinja_derive/blocks"]
-code-in-doc = ["rinja_derive/code-in-doc"]
-config = ["rinja_derive/config"]
-serde_json = ["rinja_derive/serde_json", "dep:serde", "dep:serde_json"]
+blocks = ["rinja_derive?/blocks"]
+code-in-doc = ["rinja_derive?/code-in-doc"]
+config = ["rinja_derive?/config"]
+derive = ["rinja_derive"]
+serde_json = ["rinja_derive?/serde_json", "dep:serde", "dep:serde_json"]
 std = [
     "alloc",
-    "rinja_derive/std",
+    "rinja_derive?/std",
     "serde?/std",
     "serde_json?/std",
-    "percent-encoding?/std"
+    "percent-encoding?/std",
 ]
-urlencode = ["rinja_derive/urlencode", "dep:percent-encoding"]
+urlencode = ["rinja_derive?/urlencode", "dep:percent-encoding"]

rinja/src/lib.rs

@@ -34,8 +34,8 @@
 //! }
 //!
 //! assert_eq!(
-//!     Footer { year: 2024, enterprise: "<em>Rinja</em> developers" }.to_string(),
-//!     "<p>© 2024 &#60;EM&#62;RINJA&#60;/EM&#62; DEVELOPERS</p>",
+//!     Footer { year: 2025, enterprise: "<em>Rinja</em> developers" }.to_string(),
+//!     "<p>© 2025 &#60;EM&#62;RINJA&#60;/EM&#62; DEVELOPERS</p>",
 //! );
 //! // In here you see can Rinja's auto-escaping. You, the developer,
 //! // can easily disable the auto-escaping with the `|safe` filter,
@@ -78,6 +78,7 @@ use core::fmt;
 #[cfg(feature = "std")]
 use std::io;
 
+#[cfg(feature = "derive")]
 pub use rinja_derive::Template;
 
 #[doc(hidden)]

rinja_derive/Cargo.toml

@@ -37,14 +37,19 @@ prettyplease = "0.2.20"
 similar = "2.6.0"
 syn = { version = "2.0.3", features = ["full"] }
 
+# must be the same feature list as for rinja
 [features]
+default = ["config", "derive", "std", "urlencode"]
+full = ["default", "blocks", "code-in-doc", "serde_json"]
+
 alloc = []
 blocks = ["syn/full"]
 code-in-doc = ["dep:pulldown-cmark"]
 config = ["dep:serde", "dep:basic-toml", "parser/config"]
-urlencode = []
+derive = []
 serde_json = []
 std = ["alloc"]
+urlencode = []
 
 [lints.rust]
 # Used in `rinja_derive_standalone` which uses the same source folder, but is not a proc-macro.

rinja_derive_standalone/Cargo.toml

@@ -46,11 +46,14 @@ syn = { version = "2.0.3", features = ["full"] }
 default = ["__standalone"]
 __standalone = []
 
+alloc = []
 blocks = ["syn/full"]
 code-in-doc = ["dep:pulldown-cmark"]
 config = ["dep:serde", "dep:basic-toml", "parser/config"]
-urlencode = []
+derive = []
 serde_json = []
+std = ["alloc"]
+urlencode = []
 
 [lints.rust]
 # Used in `rinja_derive` which uses the same source folder, but is a proc-macro.

testing-alloc/Cargo.toml

@@ -7,6 +7,6 @@ rust-version = "1.81"
 publish = false
 
 [dev-dependencies]
-rinja = { path = "../rinja", version = "0.3.5", default-features = false, features = ["alloc"] }
+rinja = { path = "../rinja", version = "0.3.5", default-features = false, features = ["alloc", "derive"] }
 
 assert_matches = "1.5.0"

testing-no-std/Cargo.toml

@@ -7,6 +7,6 @@ rust-version = "1.81"
 publish = false
 
 [dev-dependencies]
-rinja = { path = "../rinja", version = "0.3.5", default-features = false }
+rinja = { path = "../rinja", version = "0.3.5", default-features = false, features = ["derive"] }
 
 assert_matches = "1.5.0"

testing-renamed/Cargo.toml

@@ -7,6 +7,6 @@ rust-version = "1.81"
 publish = false
 
 [dev-dependencies]
-some_name = { package = "rinja", path = "../rinja", version = "0.3.5", default-features = false }
+some_name = { package = "rinja", path = "../rinja", version = "0.3.5", default-features = false, features = ["derive"] }
 
 assert_matches = "1.5.0"