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use lazy_static::lazy_static;
use serde::Deserialize;
use std::collections::BTreeMap;
use std::collections::HashMap;
use std::collections::HashSet;
use std::env;
use std::path::{Path, PathBuf};
use std::sync::Mutex;
lazy_static! {
static ref WORKSPACES: Mutex<BTreeMap<String, &'static Path>> = Mutex::new(BTreeMap::new());
}
fn get_cargo_workspace(manifest_dir: &str) -> Result<Option<&Path>, Box<dyn std::error::Error>> {
let mut workspaces = WORKSPACES.lock()?;
if let Some(rv) = workspaces.get(manifest_dir) {
Ok(Some(rv))
} else {
#[derive(Deserialize)]
struct Manifest {
workspace_root: String,
}
let output = std::process::Command::new(env!("CARGO"))
.arg("metadata")
.arg("--format-version=1")
.current_dir(manifest_dir)
.output()?;
let manifest: Manifest = serde_json::from_slice(&output.stdout)?;
let path = Box::leak(Box::new(PathBuf::from(manifest.workspace_root)));
workspaces.insert(manifest_dir.to_string(), path.as_path());
Ok(workspaces.get(manifest_dir).cloned())
}
}
#[derive(Deserialize)]
struct Feature {
#[allow(unused)]
description: String,
enabled: bool,
}
pub fn build() -> Result<(), Box<dyn std::error::Error>> {
let input = env::var("CARGO_MANIFEST_DIR")?;
let all_on = env::var("NUSHELL_ENABLE_ALL_FLAGS").is_ok();
let flags: HashSet<String> = env::var("NUSHELL_ENABLE_FLAGS")
.map(|s| s.split(',').map(|s| s.to_string()).collect())
.unwrap_or_else(|_| HashSet::new());
if all_on && !flags.is_empty() {
println!(
"cargo:warning=Both NUSHELL_ENABLE_ALL_FLAGS and NUSHELL_ENABLE_FLAGS were set. You don't need both."
);
}
let workspace = match get_cargo_workspace(&input)? {
None => return Ok(()),
Some(workspace) => workspace,
};
let path = Path::new(&workspace).join("features.toml");
if !path.exists() {
return Ok(());
}
let toml: HashMap<String, Feature> = toml::from_str(&std::fs::read_to_string(path)?)?;
for (key, value) in toml.iter() {
if value.enabled || all_on || flags.contains(key) {
println!("cargo:rustc-cfg={}", key);
}
}
Ok(())
}