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use std::env;
use std::ffi::OsString;
use std::io::prelude::*;
use std::path::PathBuf;
use std::process::{ExitStatus, Command, Child, Output, Stdio};
fn add_target_env(cmd: &mut Command, lib_path: &str, aux_path: Option<&str>) {
let var = if cfg!(windows) {
"PATH"
} else if cfg!(target_os = "macos") {
"DYLD_LIBRARY_PATH"
} else {
"LD_LIBRARY_PATH"
};
let mut path = env::split_paths(&env::var_os(var).unwrap_or(OsString::new()))
.collect::<Vec<_>>();
if let Some(p) = aux_path {
path.insert(0, PathBuf::from(p));
}
path.insert(0, PathBuf::from(lib_path));
let newpath = env::join_paths(&path).unwrap();
cmd.env(var, newpath);
}
pub struct Result {
pub status: ExitStatus,
pub out: String,
pub err: String
}
pub fn run(lib_path: &str,
prog: &str,
aux_path: Option<&str>,
args: &[String],
env: Vec<(String, String)> ,
input: Option<String>) -> Option<Result> {
let mut cmd = Command::new(prog);
cmd.args(args)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped());
add_target_env(&mut cmd, lib_path, aux_path);
for (key, val) in env {
cmd.env(&key, &val);
}
match cmd.spawn() {
Ok(mut process) => {
if let Some(input) = input {
process.stdin.as_mut().unwrap().write_all(input.as_bytes()).unwrap();
}
let Output { status, stdout, stderr } =
process.wait_with_output().unwrap();
Some(Result {
status: status,
out: String::from_utf8(stdout).unwrap(),
err: String::from_utf8(stderr).unwrap()
})
},
Err(..) => None
}
}
pub fn run_background(lib_path: &str,
prog: &str,
aux_path: Option<&str>,
args: &[String],
env: Vec<(String, String)> ,
input: Option<String>) -> Option<Child> {
let mut cmd = Command::new(prog);
cmd.args(args)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped());
add_target_env(&mut cmd, lib_path, aux_path);
for (key, val) in env {
cmd.env(&key, &val);
}
match cmd.spawn() {
Ok(mut process) => {
if let Some(input) = input {
process.stdin.as_mut().unwrap().write_all(input.as_bytes()).unwrap();
}
Some(process)
},
Err(..) => None
}
}