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use std::env;
use std::fs;
use std::process;
use std::str::FromStr;
use serde_json::value::Value as Json;
use handlebars::Handlebars;
fn usage() -> ! {
eprintln!("Usage: handlebars-cli template.hbs '{{\"json\": \"data\"}}'");
process::exit(1);
}
fn parse_json(text: &str) -> Json {
let result = if let Some(text) = text.strip_prefix('@') {
fs::read_to_string(text).unwrap()
} else {
text.to_owned()
};
match Json::from_str(&result) {
Ok(json) => json,
Err(_) => usage(),
}
}
fn main() {
let mut args = env::args();
args.next(); // skip own filename
let (filename, json) = match (args.next(), args.next()) {
(Some(filename), Some(json)) => (filename, json),
_ => usage(),
};
let data = parse_json(&json);
let mut handlebars = Handlebars::new();
handlebars
.register_template_file(&filename, &filename)
.ok()
.unwrap();
match handlebars.render(&filename, &data) {
Ok(data) => {
println!("{}", data);
}
Err(e) => {
println!("Error rendering {}: {}", filename, e);
process::exit(2);
}
}
}
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