4 files changed, 64 insertions, 0 deletions
diff --git a/pkgs/nomsring/.gitignore b/pkgs/nomsring/.gitignore
new file mode 100644
index 0000000..b5e3679
--- /dev/null
+++ b/pkgs/nomsring/.gitignore
@@ -0,0 +1 @@
+dist-newstyle/*
diff --git a/pkgs/nomsring/Main.hs b/pkgs/nomsring/Main.hs
new file mode 100644
index 0000000..5c70491
--- /dev/null
+++ b/pkgs/nomsring/Main.hs
@@ -0,0 +1,32 @@
+module Main where
+
+import Network.CGI (CGIResult, runCGI, getInput, output, redirect, pathInfo, CGI, outputNotFound, liftIO)
+import Data.CircularList (CList, fromList, rotR, rotateTo, focus, rotL)
+import Data.Maybe(fromJust, fromMaybe)
+import Data.Functor ((<&>))
+
+webring :: CList String
+webring = fromList
+  [ "stuebinm.eu"
+  , "nwex.de"
+  ]
+
+main :: IO ()
+main = runCGI $ do
+  path <- pathInfo
+  case path of
+    "/" -> output "nomsable websites"
+    "/next" -> rotate True
+    "/previous" -> rotate False
+    _ -> outputNotFound path
+
+rotate :: Bool -> CGI CGIResult
+rotate backwards = do
+  from <- getInput "from" <&> fromMaybe (focus' webring)
+  case rotateTo from webring of
+    Nothing -> redirect ("https://" <> focus' webring)
+    Just ring -> redirect ("https://" <> focus' (step ring))
+    where step = if backwards then rotL else rotR
+
+focus' :: CList c -> c
+focus' = fromJust . focus
diff --git a/pkgs/nomsring/default.nix b/pkgs/nomsring/default.nix
new file mode 100644
index 0000000..c7ad358
--- /dev/null
+++ b/pkgs/nomsring/default.nix
@@ -0,0 +1,12 @@
+{ mkDerivation, base, cgi, data-clist, lib }:
+mkDerivation {
+  pname = "nomsring";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [ base cgi data-clist ];
+  description = "noms noms";
+  license = lib.licenses.bsd3;
+  mainProgram = "nomsring";
+}
diff --git a/pkgs/nomsring/nomsring.cabal b/pkgs/nomsring/nomsring.cabal
new file mode 100644
index 0000000..0ee04a3
--- /dev/null
+++ b/pkgs/nomsring/nomsring.cabal
@@ -0,0 +1,19 @@
+cabal-version:      3.0
+name:               nomsring
+version:            0.1.0.0
+synopsis:           noms noms
+description:        a webring for nomsable websites
+license:            BSD-3-Clause
+author:             stuebinm
+maintainer:         stuebinm@disroot.org
+
+common warnings
+    ghc-options: -Wall
+
+executable nomsring
+    import:           warnings
+    main-is:          Main.hs
+    build-depends:    base ^>=4.17.2.1
+                    , cgi ^>=3001.5
+                    , data-clist ^>= 0.2
+    default-language: GHC2021