27a73171cf
A little executable, combining the netencode and mustache libraries to make easy templating from the command line possible. Combined with the nix netencode generators, it’s now trivial to populate a mustache template with (nearly) arbitrary data. Yay. Change-Id: I5b892c38fbc33dd826a26174dd9567f0b72e6322 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2320 Reviewed-by: Profpatsch <mail@profpatsch.de> Tested-by: BuildkiteCI
71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
extern crate netencode;
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extern crate mustache;
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use mustache::{Data};
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use netencode::{T};
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use std::collections::HashMap;
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use std::os::unix::ffi::{OsStrExt};
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use std::io::{Read};
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fn arglib_netencode(env: Option<&std::ffi::OsStr>) -> Result<T, String> {
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let env = match env {
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None => std::ffi::OsStr::from_bytes("ARGLIB_NETENCODE".as_bytes()),
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Some(a) => a
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};
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match std::env::var_os(env) {
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None => Err(format!("could not read args, envvar {} not set", env.to_string_lossy())),
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// TODO: good error handling for the different parser errors
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Some(soup) => match netencode::parse::t_t(soup.as_bytes()) {
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Ok((remainder, t)) => match remainder.is_empty() {
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true => Ok(t),
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false => Err(format!("there was some unparsed bytes remaining: {:?}", remainder))
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},
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Err(err) => Err(format!("parsing error: {:?}", err))
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}
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}
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}
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fn netencode_to_mustache_data_dwim(t: T) -> Data {
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match t {
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// TODO: good idea?
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T::Unit => Data::Null,
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T::N1(b) => Data::Bool(b),
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T::N3(u) => Data::String(u.to_string()),
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T::N6(u) => Data::String(u.to_string()),
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T::N7(u) => Data::String(u.to_string()),
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T::I3(i) => Data::String(i.to_string()),
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T::I6(i) => Data::String(i.to_string()),
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T::I7(i) => Data::String(i.to_string()),
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T::Text(s) => Data::String(s),
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T::Binary(b) => unimplemented!(),
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T::Sum(tag) => unimplemented!(),
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T::Record(xs) => Data::Map(
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xs.into_iter()
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.map(|(key, val)| (key, netencode_to_mustache_data_dwim(*val)))
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.collect::<HashMap<_,_>>()
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),
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T::List(xs) => Data::Vec(
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xs.into_iter()
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.map(|x| netencode_to_mustache_data_dwim(x))
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.collect::<Vec<_>>()
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),
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}
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}
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pub fn from_stdin() -> () {
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let data = netencode_to_mustache_data_dwim(
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arglib_netencode(None).unwrap()
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);
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let mut stdin = String::new();
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std::io::stdin().read_to_string(&mut stdin).unwrap();
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mustache::compile_str(&stdin)
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.and_then(|templ| templ.render_data(
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&mut std::io::stdout(),
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&data
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)).unwrap()
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}
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pub fn main() {
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from_stdin()
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}
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