tests: add criterion bench

Cargo.toml

@@ -22,6 +22,13 @@ update-informer = ["dep:update-informer"]
 web-image = ["dep:reqwest"]
 dump-json = ["dep:serde_json"]
 
+[dev-dependencies]
+criterion = { version = "0.5", features = ["html_reports"] }
+
+[[bench]]
+name = "template"
+harness = false
+
 [dependencies]
 # logging
 log = "0.4.17"

benches/template.rs

@@ -0,0 +1,50 @@
+use std::hint::black_box;
+use criterion::{criterion_group, criterion_main, Criterion};
+
+use matugen::{scheme::{get_custom_color_schemes, get_schemes, SchemesEnum}, template_util::template::{self, get_render_data, render_template}};
+use template::add_engine_filters;
+use upon::{Engine, Syntax};
+
+fn parse_template(data: &str) {
+    let source_color = material_colors::color::Argb::new(255, 255, 0, 0);
+
+    let syntax = Syntax::builder().expr("{{", "}}").block("<*", "*>").build();
+    let mut engine = Engine::with_syntax(syntax);
+
+    add_engine_filters(&mut engine);
+
+    let (scheme_dark, scheme_light) = get_schemes(source_color, &None, &None);
+    let schemes = get_custom_color_schemes(
+        source_color,
+        scheme_dark,
+        scheme_light,
+        &None,
+        &None,
+        &None
+    );
+    let render_data = get_render_data(&schemes, &source_color,&SchemesEnum::Dark, &None, None).unwrap();
+
+    engine.add_template("a", data.repeat(50)).expect("failed to add template");
+    render_template(&engine, &"a".to_string(), &render_data, None).expect("failed to render template");
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let data = 
+    r#"
+    <* for name, value in colors *>
+        {{name}} {{value.default.rgba}};
+    <* endfor *>
+    "#;
+    let data_filter = 
+    r#"
+    <* for name, value in colors *>
+        {{name | replace: "_", "-" }} {{value.default.rgba | set_alpha: 0.7 | set_hue: -180.0 }};
+    <* endfor *>
+    "#;
+
+    c.bench_function("parse 20", |b| b.iter(|| parse_template(black_box(&data.repeat(20)))));
+    c.bench_function("parse 20 filters", |b| b.iter(|| parse_template(black_box(&data_filter.repeat(20)))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);