updates

kernel/bin/test

@@ -0,0 +1,35 @@
+/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
+function bareStdin(ctx) {
+  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
+}
+
+async function evalTest(ctx, args) {
+  if (!args.length) return false
+  if (args[0] === '!') {
+    const inner = await evalTest(ctx, args.slice(1))
+    return !inner
+  }
+  if (args.length === 3) {
+    const [a, op, b] = args
+    if (op === '=') return a === b
+    if (op === '!=') return a !== b
+    return false
+  }
+  if (args.length === 2) {
+    const op = args[0]
+    const p = args[1]
+    const st = await ctx.vfs.stat(p)
+    if (op === '-e' || op === '-a') return st != null
+    if (op === '-f') return st != null && st.type === 'file'
+    if (op === '-d') return st != null && st.type === 'directory'
+    if (op === '-z') return p.length === 0
+    if (op === '-n') return p.length > 0
+    return false
+  }
+  if (args.length === 1) return args[0] !== ''
+  return false
+}
+
+async function run(ctx, argv) {
+  ctx.exitCode = (await evalTest(ctx, argv.slice(1))) ? 0 : 1
+}