How do you read a YAML file in Rust?

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

Solution

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:

use serde_yaml; // 0.8.7

fn main() -> Result<(), Box<dyn 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(())
}

something.yaml:

"I am YAML"

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