Pfthb

I've poked the serde-yaml and yaml-rust crates a bit, but I haven't seen any examples.

serde-yaml's documentation has the following 4 functions:

• 
  from_reader — Deserialize an instance of type T from an IO stream of YAML.


• 
  from_slice — Deserialize an instance of type T from bytes of YAML text.


• 
  from_str — Deserialize an instance of type T from a string of YAML text.


• 
  from_value — Interpret a serde_yaml::Value as an instance of type T.

Using from_reader as an example:

extern crate serde_yaml;

fn main() -> Result<(), Box<std::error::Error>> 
 let f = std::fs::File::open("something.yaml")?;
 let d: String = serde_yaml::from_reader(f)?;
 println!("Read YAML string: ", d);
 Ok(())

You can deserialize into the looser-typed Value if you don't know your format, but be sure to read the Serde guide for full details of how to do type-directed serialization and deserialization.

See also:

• How do I parse a JSON File?


• Deserializing TOML into vector of enum with values

In general, using any Serde format is pretty much the same as all the rest.

A YAML file is a normal (text) file like any other you can read it using
the example in the Rust documentation. In particular using File::open(filename) and doing .read_to_string() on the result of the former.

yaml-rust and serde-yaml are for parsing and loading YAML files, and since your question doesn't indicate that you want to do that, but only want to read the file, there is no need to use those libraries.