import { ChildProcess, spawn, SpawnOptions } from 'node:child_process';
import { once } from 'node:events';
async function ls() {
const ls = spawn('ls', ['-lh', '/usr']);
// NOTES:
// - spawn/spawnSync are the foundation of all other methods
// - async, non-blocking (event loop)
ls.stdout.on('data', (data) => {
console.log(`stdout: ${data}`);
});
ls.stderr.on('data', (data) => {
console.error(`stderr: ${data}`);
});
const [code] = await once(ls, 'close');
console.log(`child process exited with code ${code}`);
}
// await ls();
async function cat_hello() {
const cat = spawn('cat');
cat.stdout.on('data', (data) => {
console.log(`stdout: ${data}`);
});
cat.stderr.on('data', (data) => {
console.error(`stderr: ${data}`);
});
cat.stdin.write("HEY FUCKTURD");
cat.stdin.end();
const [code] = await once(cat, 'close');
console.log(`child process exited with code ${code}`);
}
// await cat_hello();
async function sleep_abort() {
const aborter = new AbortController();
const options: SpawnOptions = {};
// options.shell = ""
options.signal = aborter.signal;
const cat = spawn('sleep', ["5"], options);
if (cat.stdout) {
cat.stdout.on('data', (data) => {
console.log(`stdout: ${data}`);
});
}
if (cat.stderr) {
cat.stderr.on('data', (data) => {
console.error(`stderr: ${data}`);
});
}
cat.on('error', (err) => {
console.log("ERR", err);
});
aborter.abort();
const [code] = await once(cat, 'close');
console.log(`child process exited with code ${code}`);
}
// await sleep_abort();
async function shells(child_process: ChildProcess) {
if (child_process.stdout) {
child_process.stdout.on('data', (data) => {
console.log(`stdout: ${data}`);
});
}
if (child_process.stderr) {
child_process.stderr.on('data', (data) => {
console.error(`stderr: ${data}`);
});
}
child_process.on('error', (err) => {
console.log("ERR", err);
});
const [code] = await once(child_process, 'close');
console.log(`child process exited with code ${code}`);
}
await shells(spawn('echo', ["5"], { shell: false })); // works
// await shells(spawn('echo 55', { shell: false })); // fails
// *** pass only command arg w/ cmd+args and shell=true
await shells(spawn('echo 66', { shell: true })); // works
await shells(spawn('echo $fish_pid', { shell: true })); // no fish_pid (not fish shell)
await shells(spawn('echo $fish_pid', { shell: "fish" })); // works! fish shell!
// await shells(spawn('echo', ["5"], { shell: true })); // works but w/ warning about args are just concatenated (not sanitized)
// default shell info
await shells(spawn("echo", ['$PATH'], { shell: false })); // verbatim prints "$PATH" b/c no shell
await shells(spawn("echo", ['$PATH'], { shell: true })); // shows PATH variable value // warning too (first call w/ cmd,args array)
await shells(spawn("echo", ['$$'], { shell: false })); // verbatim $$ printed (no shell)
await shells(spawn("echo", ['$$'], { shell: true })); // prints PID of default shell
// await shells(spawn("set", { shell: true })); // prints PID of default shell
await shells(spawn("set -x; echo $0; echo $PATH; echo $BASH_VERSION", { shell: true })); // /bin/sh => bash in POSIX mode
// $0 = /bin/sh (on mac/linux)
// $BASH_VERSION
await shells(spawn("declare", { shell: true })); // dump default shell variables
// await shells(spawn("ps", { shell: false })); // default shell info
console.log("HERE:")
await shells(spawn("echo", ['$PATH'])); // default is shell=false
