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#![allow(dead_code)]
#![unstable(feature = "process_internals", issue = "none")]
use crate::collections::BTreeMap;
use crate::env;
use crate::ffi::{OsStr, OsString};
use crate::sys::process::EnvKey;
// Stores a set of changes to an environment
#[derive(Clone, Debug)]
pub struct CommandEnv {
clear: bool,
saw_path: bool,
vars: BTreeMap<EnvKey, Option<OsString>>,
}
impl Default for CommandEnv {
fn default() -> Self {
CommandEnv { clear: false, saw_path: false, vars: Default::default() }
}
}
impl CommandEnv {
// Capture the current environment with these changes applied
pub fn capture(&self) -> BTreeMap<EnvKey, OsString> {
let mut result = BTreeMap::<EnvKey, OsString>::new();
if !self.clear {
for (k, v) in env::vars_os() {
result.insert(k.into(), v);
}
}
for (k, maybe_v) in &self.vars {
if let &Some(ref v) = maybe_v {
result.insert(k.clone(), v.clone());
} else {
result.remove(k);
}
}
result
}
pub fn is_unchanged(&self) -> bool {
!self.clear && self.vars.is_empty()
}
pub fn capture_if_changed(&self) -> Option<BTreeMap<EnvKey, OsString>> {
if self.is_unchanged() { None } else { Some(self.capture()) }
}
// The following functions build up changes
pub fn set(&mut self, key: &OsStr, value: &OsStr) {
let key = EnvKey::from(key);
self.maybe_saw_path(&key);
self.vars.insert(key, Some(value.to_owned()));
}
pub fn remove(&mut self, key: &OsStr) {
let key = EnvKey::from(key);
self.maybe_saw_path(&key);
if self.clear {
self.vars.remove(&key);
} else {
self.vars.insert(key, None);
}
}
pub fn clear(&mut self) {
self.clear = true;
self.vars.clear();
}
pub fn have_changed_path(&self) -> bool {
self.saw_path || self.clear
}
fn maybe_saw_path(&mut self, key: &EnvKey) {
if !self.saw_path && key == "PATH" {
self.saw_path = true;
}
}
pub fn iter(&self) -> CommandEnvs<'_> {
let iter = self.vars.iter();
CommandEnvs { iter }
}
}
/// An iterator over the command environment variables.
///
/// This struct is created by
/// [`Command::get_envs`][crate::process::Command::get_envs]. See its
/// documentation for more.
#[must_use = "iterators are lazy and do nothing unless consumed"]
#[stable(feature = "command_access", since = "1.57.0")]
#[derive(Debug)]
pub struct CommandEnvs<'a> {
iter: crate::collections::btree_map::Iter<'a, EnvKey, Option<OsString>>,
}
#[stable(feature = "command_access", since = "1.57.0")]
impl<'a> Iterator for CommandEnvs<'a> {
type Item = (&'a OsStr, Option<&'a OsStr>);
fn next(&mut self) -> Option<Self::Item> {
self.iter.next().map(|(key, value)| (key.as_ref(), value.as_deref()))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
#[stable(feature = "command_access", since = "1.57.0")]
impl<'a> ExactSizeIterator for CommandEnvs<'a> {
fn len(&self) -> usize {
self.iter.len()
}
fn is_empty(&self) -> bool {
self.iter.is_empty()
}
}
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