From dda29ca7685d360d5428dd827d11a9e4139a0872 Mon Sep 17 00:00:00 2001
From: Justin Bedo <cu@cua0.org>
Date: Thu, 6 Oct 2022 10:21:34 +1100
Subject: init

---
 day2/ex2-dlrow-olleh/default.nix | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 day2/ex2-dlrow-olleh/default.nix

(limited to 'day2/ex2-dlrow-olleh/default.nix')

diff --git a/day2/ex2-dlrow-olleh/default.nix b/day2/ex2-dlrow-olleh/default.nix
new file mode 100644
index 0000000..91bbe1f
--- /dev/null
+++ b/day2/ex2-dlrow-olleh/default.nix
@@ -0,0 +1,30 @@
+/*
+This exercise demonstrates the first workflow consisting of multiple
+steps.  We will build upon the previous example by using the string
+produced in exercise 1 as input to this workflow. You can see how other
+files can be imported and used in the construction of workflows using
+`callBionix`, which imports a file and passes it `bionix` along with
+potentially some additional arguments.
+
+Goal: fill out the stage here to reverse the string using the `rev`
+program, which reads lines on stdin and writes them to stdout with the
+characters reversed. You will need to choose exactly *which* rev you
+want to use in `buildInputs`: there are three providers available
+(busybox, toybox, utillinux) and you can try them all.
+
+Bonus: change the last line to call rev twice, thereby reversing the
+strings back to the original orientation
+*/
+{bionix}:
+with bionix; let
+  hello-world = callBionix ../ex1-hello-world {};
+
+  rev = input:
+    stage {
+      name = "rev";
+      buildInputs = [];
+      buildCommand = ''
+      '';
+    };
+in
+  rev hello-world
-- 
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