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use std::borrow::Cow;
use std::collections::{HashMap, HashSet};
use std::os::unix::ffi::OsStrExt;
use std::sync::LazyLock;
use std::time::Instant;
use crate::BString;
use crate::bstr;
pub struct Vars {
simple: HashMap<BString, BString>,
magic: HashMap<BString, fn() -> BString>,
all: HashSet<BString>,
export: HashSet<BString>,
}
impl Vars {
fn new(
mut simple: HashMap<BString, BString>,
magic: HashMap<BString, fn() -> BString>,
) -> Self {
for (var, val) in std::env::vars_os() {
// explicitly added variables get priority.
if !simple.contains_key(var.as_bytes()) {
simple.insert(var.into_encoded_bytes(), val.into_encoded_bytes());
}
}
let all = simple
.keys()
.cloned()
.chain(magic.keys().cloned())
.collect();
let export = std::env::vars_os()
.map(|x| x.0.into_encoded_bytes())
.collect();
Self {
simple,
magic,
all,
export,
}
}
pub fn set(&mut self, var: BString, val: BString) {
self.simple.insert(var.clone(), val);
self.all.insert(var);
}
pub fn lookup<'a>(&'a self, var: &bstr) -> Option<Cow<'a, bstr>> {
if let Some(fun) = self.magic.get(var) {
return Some(Cow::Owned(fun()));
}
if let Some(val) = self.simple.get(var) {
return Some(Cow::Borrowed(val));
}
None
}
pub fn allow_export(&mut self, var: &bstr, allow: bool) {
if allow {
self.export.insert(var.to_vec());
} else {
self.export.remove(var);
}
}
pub fn export<'a>(&'a self) -> HashMap<&'a bstr, Cow<'a, bstr>> {
self.export
.iter()
.filter_map(|var| {
let val = self.lookup(var)?;
Some((var.as_ref(), val))
})
.collect()
}
pub fn vars(&self) -> &HashSet<BString> {
&self.all
}
}
macro_rules! map {
($($key:expr => $val:expr),* $(,)?) => {{
let mut map = HashMap::<BString, _, _>::new();
$(map.insert($key.into(), $val);)*
map
}};
}
impl Default for Vars {
fn default() -> Self {
use crate::basedir::xdg;
let simple = map! {
b"PISH_VERSION" => crate::consts::PISH_VERSION.as_bytes().to_vec(),
b"PISH_COMMIT" => crate::consts::PISH_COMMIT.as_bytes().to_vec(),
b"PISH_DIRTY" => vec![crate::consts::PISH_DIRTY as u8 + b'0'],
xdg::DATA_HOME => xdg::data_home().as_os_str().as_bytes().to_vec(),
xdg::STATE_HOME => xdg::state_home().as_os_str().as_bytes().to_vec(),
xdg::CONFIG_HOME => xdg::config_home().as_os_str().as_bytes().to_vec(),
};
let magic = map! {
b"CWD_PRETTY" => crate::pretty_cwd as _,
b"SECONDS" => seconds_since_startup as _,
};
// call it once such that lazylock gets initialized
seconds_since_startup();
let mut this = Self::new(simple.clone(), magic);
for var in simple.keys() {
if var.starts_with(b"XDG_") {
this.allow_export(var, true);
}
}
this
}
}
static START: LazyLock<Instant> = LazyLock::new(Instant::now);
fn seconds_since_startup() -> BString {
format!("{}", START.elapsed().as_secs_f64() as u64).into_bytes()
}
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