oliphaunt-extension-postgis 0.1.1

Target-selecting Cargo facade for 1 Oliphaunt PostgreSQL extension member.
Documentation 
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use std::collections::BTreeMap;
use std::env;

const PREFIX: &str = "DEP_OLIPHAUNT_ARTIFACT_";
const RELAY_PREFIX: &str = "DEP_OLIPHAUNT_ARTIFACT_RELAY_";
const SUFFIX: &str = "_MANIFEST";

fn main() {
    let mut manifests = BTreeMap::new();
    for (key, value) in env::vars() {
        if value.is_empty() || key.starts_with(RELAY_PREFIX) {
            continue;
        }
        let Some(stem) = key.strip_prefix(PREFIX).and_then(|value| value.strip_suffix(SUFFIX)) else {
            continue;
        };
        if stem.is_empty() {
            panic!("empty Oliphaunt artifact metadata stem");
        }
        if let Some(previous) = manifests.insert(stem.to_ascii_lowercase(), value.clone()) {
            if previous != value {
                panic!("conflicting Oliphaunt extension leaf manifests for {stem}");
            }
        }
        println!("cargo::rerun-if-changed={value}");
    }
    if manifests.is_empty() && env::var_os("OLIPHAUNT_ARTIFACT_CRATE_REQUIRE_PAYLOAD").is_some() {
        panic!("extension facade resolved no target-leaf artifact manifest");
    }
    for (stem, manifest) in manifests {
        println!("cargo::metadata={stem}_manifest={manifest}");
    }
}