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|
use crate::prelude::*;
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub enum Env {
V0(V0),
}
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct V0 {
pwd: std::path::PathBuf,
vars: std::collections::HashMap<std::ffi::OsString, std::ffi::OsString>,
}
const __NBSH_IDX: &str = "__NBSH_IDX";
const __NBSH_LATEST_STATUS: &str = "__NBSH_LATEST_STATUS";
const __NBSH_PREV_PWD: &str = "__NBSH_PREV_PWD";
impl Env {
pub fn new() -> anyhow::Result<Self> {
let pwd = std::env::current_dir()?;
Ok(Self::V0(V0 {
pwd: pwd.clone(),
vars: std::env::vars_os()
.chain(Self::defaults(pwd).into_iter())
.collect(),
}))
}
pub fn new_from_env() -> anyhow::Result<Self> {
let pwd = std::env::current_dir()?;
Ok(Self::V0(V0 {
pwd: pwd.clone(),
vars: Self::defaults(pwd)
.into_iter()
.chain(std::env::vars_os())
.collect(),
}))
}
pub fn pwd(&self) -> &std::path::Path {
match self {
Self::V0(env) => &env.pwd,
}
}
pub fn var(&self, k: &str) -> Option<String> {
match self {
Self::V0(env) => self.special_var(k).or_else(|| {
env.vars
.get(std::ffi::OsStr::new(k))
.map(|v| v.to_str().unwrap().to_string())
}),
}
}
pub fn set_var<
K: Into<std::ffi::OsString>,
V: Into<std::ffi::OsString>,
>(
&mut self,
k: K,
v: V,
) {
match self {
Self::V0(env) => {
env.vars.insert(k.into(), v.into());
}
}
}
pub fn idx(&self) -> usize {
self.var(__NBSH_IDX).unwrap().parse().unwrap()
}
pub fn set_idx(&mut self, idx: usize) {
self.set_var(__NBSH_IDX, format!("{}", idx));
}
pub fn latest_status(&self) -> std::process::ExitStatus {
std::process::ExitStatus::from_raw(
self.var(__NBSH_LATEST_STATUS).unwrap().parse().unwrap(),
)
}
pub fn set_status(&mut self, status: std::process::ExitStatus) {
self.set_var(
__NBSH_LATEST_STATUS,
format!(
"{}",
(status.code().unwrap_or(0) << 8)
| status.signal().unwrap_or(0)
),
);
}
pub fn prev_pwd(&self) -> std::path::PathBuf {
std::path::PathBuf::from(self.var(__NBSH_PREV_PWD).unwrap())
}
pub fn set_prev_pwd(&mut self, prev_pwd: std::path::PathBuf) {
self.set_var(__NBSH_PREV_PWD, prev_pwd);
}
pub fn apply(&self, cmd: &mut pty_process::Command) {
match self {
Self::V0(env) => {
cmd.current_dir(&env.pwd);
cmd.env_clear();
cmd.envs(env.vars.iter());
}
}
}
pub fn update(&mut self) -> anyhow::Result<()> {
let idx = self.idx();
let status = self.latest_status();
let prev_pwd = self.prev_pwd();
*self = Self::new()?;
self.set_idx(idx);
self.set_status(status);
self.set_prev_pwd(prev_pwd);
Ok(())
}
fn special_var(&self, k: &str) -> Option<String> {
Some(match k {
"$" => crate::info::pid(),
"?" => {
let status = self.latest_status();
status
.signal()
.map_or_else(
|| status.code().unwrap(),
|signal| signal + 128,
)
.to_string()
}
_ => return None,
})
}
fn defaults(
pwd: std::path::PathBuf,
) -> [(std::ffi::OsString, std::ffi::OsString); 3] {
[
(__NBSH_IDX.into(), "0".into()),
(__NBSH_LATEST_STATUS.into(), "0".into()),
(__NBSH_PREV_PWD.into(), pwd.into()),
]
}
}
|
