Add pipefail module

Author: 132ikl

stdlib-candidate/std-rfc/pipefail/mod.nu

@@ -0,0 +1,16 @@
+export alias default-run-external = run-external
+
+export def --wrapped run-external [...rest: string] {
+  let results = default-run-external ($rest | first) ...($rest | skip 1) | complete
+  if $results.exit_code != 0 {
+    error make {
+      msg: "External command failed"
+      label: {
+        text: "command had a non-zero exit code",
+        span: (metadata $rest).span
+      }
+    }
+  } else {
+    $results.stdout
+  }
+}