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/**
* Is `command` runnable — an executable at that path, or a name resolvable on PATH?
*
* Resolved by reading PATH rather than by spawning: callers use it on the startup path and in error
* reporting, where launching a process to ask would be both slower and noisier.
*
* The same shape already lives in `herdrBinaryAvailable` (lib/herdrSessions.ts), which keeps its own
* copy because it is exported API with its own tests.
*/
import { accessSync, constants } from 'node:fs'
import { delimiter, join } from 'node:path'
export function binaryOnPath(command: string, env: NodeJS.ProcessEnv = process.env): boolean {
if (!command) return false
const extensions = process.platform === 'win32' ? ['.exe', '.cmd', '.bat', ''] : ['']
const candidates = command.includes('/') || command.includes('\\')
? [command]
: (env.PATH ?? '').split(delimiter).filter(Boolean).map((dir) => join(dir, command))
return candidates.some((candidate) => extensions.some((extension) => {
try { accessSync(candidate + extension, constants.X_OK); return true } catch { return false }
}))
}