1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/handlebars/examples/helper_macro.rs b/vendor/handlebars/examples/helper_macro.rs
new file mode 100644
index 000000000..dcc6ea31a
--- /dev/null
+++ b/vendor/handlebars/examples/helper_macro.rs
@@ -0,0 +1,63 @@
+use std::error::Error;
+
+use handlebars::{handlebars_helper, Handlebars, JsonRender};
+use serde_json::{json, Value};
+use time::format_description::parse;
+use time::OffsetDateTime;
+
+// define a helper using helper
+// a date format helper accept an `OffsetDateTime` as parameter
+handlebars_helper!(date: |dt: OffsetDateTime| dt.format(&parse("[year]-[month]-[day]").unwrap()).unwrap());
+
+// a helper returns number of provided parameters
+handlebars_helper!(nargs: |*args| args.len());
+
+// a helper joins all values, using both hash and parameters
+handlebars_helper!(join: |{sep:str=","}, *args|
+                   args.iter().map(|a| a.render()).collect::<Vec<String>>().join(sep)
+);
+
+handlebars_helper!(isdefined: |v: Value| !v.is_null());
+
+// a helper provides format
+handlebars_helper!(date2: |dt: OffsetDateTime, {fmt:str = "[year]-[month]-[day]"}|
+    dt.format(&parse(fmt).unwrap()).unwrap()
+);
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // create the handlebars registry
+    let mut handlebars = Handlebars::new();
+
+    handlebars.register_helper("date", Box::new(date));
+    handlebars.register_helper("date2", Box::new(date2));
+    handlebars.register_helper("nargs", Box::new(nargs));
+    handlebars.register_helper("join", Box::new(join));
+    handlebars.register_helper("isdefined", Box::new(isdefined));
+
+    let data = OffsetDateTime::now_utc();
+
+    println!("{}", handlebars.render_template("{{date this}}", &data)?);
+    println!("{}", handlebars.render_template("{{date2 this}}", &data)?);
+    println!(
+        "{}",
+        handlebars.render_template("{{date2 this fmt=\"[day]/[month]/[year]\"}}", &data)?
+    );
+
+    println!("{}", handlebars.render_template("{{nargs 1 2 3 4}}", &())?);
+
+    println!(
+        "{}",
+        handlebars.render_template("{{join 1 2 3 4 sep=\"|\" }}", &())?
+    );
+
+    println!(
+        "{}",
+        handlebars.render_template(
+            r#"{{isdefined a}} {{isdefined b}}
+{{#if (isdefined a)}}a{{/if}} {{#if (isdefined b)}}b{{/if}}"#,
+            &json!({"a": 1})
+        )?
+    );
+
+    Ok(())
+}