Usage example? about docker-compose-types HOT 5 CLOSED

@jcaesar you are more than welcome to submit a pull request that adds the example. tests/mod.rs has a few examples.

As for env expansion, nothing is built into this crate that would do something like that automatically, contributions welcome.

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@jcaesar I'm going to close this issue for now, feel free to come by and help us improve the README if you still want to at some point in the future.

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Hm. Looking at haddock, variable interpolation is somewhat complex (there's a nom parser behind this). I could make a PR that copies that code, but... :/ (One concrete problem is that that's GPL.).
[Edit:] Hm. compose_yml implements variable interpolation. But it's quite out of date…

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All right, since I have a concrete thing I need to implement, I'll go with

struct OsEnv;
impl compose_yml::v2::Environment for OsEnv {
    fn var(&self, key: &str) -> Result<String, VarError> {
        std::env::var(key)
    }
}

fn interpolate(v: &mut YamlValue, e: &dyn compose_yml::v2::Environment) -> Result<()> {
    match v {
        YamlValue::String(s) => {
            *s = compose_yml::v2::raw::<String, _>(s.clone())?
                .interpolate_env(e)?
                .clone();
        }
        YamlValue::Sequence(s) => {
            for s in s {
                interpolate(s, e)?;
            }
        }
        YamlValue::Mapping(m) => {
            for v in m.values_mut() {
                interpolate(v, e)?;
            }
        }
        YamlValue::Tagged(tagged) => interpolate(&mut tagged.value, e)?,
        _ => (),
    }
    Ok(())
}

interpolate(&mut def, &OsEnv)?;

for now and worry about a pretty PR to docker-compose-types later.

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Perfectly valid solution! Glad you managed to get something working for yourself.

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