timelapse: initial code dump

apps/timelapse/default.nix

@@ -0,0 +1,18 @@
+with import <nixpkgs> {};
+
+stdenv.mkDerivation {
+  name = "timelapse";
+  src = ./.;
+
+  buildInputs = with pkgs; [ ruby gphoto2 ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp timelapse.rb $out/bin/timelapse
+  '';
+  
+  meta = with lib; {
+    description = "A small tool to capture timelapse series with gphoto";
+  };
+}
+

apps/timelapse/timelapse.rb

@@ -0,0 +1,13 @@
+#!/usr/bin/env ruby
+
+# A function to capture a picture with gphoto2, retrying 3-times in
+# case of errors.
+def capture_picture
+  3.times do
+    break if `gphoto2 --capture-image` == 0
+    puts "Retrying gphoto2 capture..."
+  end
+end
+
+
+capture_picture