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use std::collections::{HashMap, HashSet};
use crate::BString;
use crate::bstr;
pub struct Vars {
simple: HashMap<BString, BString>,
magic: HashMap<BString, fn() -> BString>,
all: 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() {
simple.insert(var.into_encoded_bytes(), val.into_encoded_bytes());
}
let all = simple
.keys()
.cloned()
.chain(magic.keys().cloned())
.collect();
Self { simple, magic, all }
}
pub fn set(&mut self, var: BString, val: BString) {
self.simple.insert(var.clone(), val);
self.all.insert(var);
}
pub fn lookup(&self, var: &bstr) -> Option<BString> {
if let Some(fun) = self.magic.get(var) {
return Some(fun());
}
if let Some(val) = self.simple.get(var) {
return Some(val.clone());
}
None
}
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 {
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'],
};
let magic = map! {
b"CWD_PRETTY" => crate::pretty_cwd as _
};
Self::new(simple, magic)
}
}
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