import { isAscii } from 'node:buffer';
import { spawnSync, SpawnSyncOptionsWithBufferEncoding, StdioOptions } from 'node:child_process';
import { setDefaultResultOrder } from 'node:dns';
// NOTES:
// - blocks event loop in exchange for convenience
async function runSyncWithStdio(stdioValue: StdioOptions) {
console.log("\n\n" + "=".repeat(20) + " run " + "=".repeat(20) + "\n");
const options: SpawnSyncOptionsWithBufferEncoding = {
stdio: stdioValue,
};
console.log("options", options);
const command = "ls";
const args = ["-lh", "/usr"];
const result = spawnSync(command, args, options);
const chalk = (await import('chalk')).default
console.log(chalk.green("\n## spawnSync COMPLETE\n"));
console.log("\n## spawnSync COMPLETE\n");
console.log("result", result);
if (result.stdout && result.stdout.byteLength > 0) {
console.log(`stdout (#${result.stdout.byteLength}):`, result.stdout.toString());
}
if (result.stderr && result.stderr.byteLength > 0) {
// PRN look for diff .length vs .byteLength => see if can find scenarios where they aren't mismatched in my codebases (for other purposes, i.e. RAG matches column offset calculations)
console.log(`stderr (#${result.stderr.byteLength}):`, result.stderr.toString());
}
return result;
}
// *** KEY setting => DO NOT USE "inherit" type behavior w/ MCP server
// b/c then it is writing to the STDOUT/ERR and reading from STDIN that are intended for client to server JSON based comms only!
//
runSyncWithStdio("inherit") // ls output is BEFORE result returned (b/c inherit means use parent process STDIN/OUT/ERR... so it writes immediately to STDOUT!
// buffer STDOUT/ERR
runSyncWithStdio("pipe") // ls output is obtained after result returned (b/c piped to buffer)
