Revert "Merge pull request 'Rewrite easyscan in haskell' (#31) from easyscan2 into trunk"

This reverts commit b3fb8aff73, reversing
changes made to a7aa536cf6.

nix/packages/by-name/easyscan/package.nix

@@ -1,28 +1,19 @@
 {
-  lib,
-  haskellPackages,
-  haskell,
-  symlinkJoin,
-  makeWrapper,
-  sane-backends, # scanimage
-  poppler-utils, # mergepdf
+  writeShellApplication,
+  sane-backends,
+  poppler-utils,
+  fzf,
+  ghostscript,
 }:
-let
-  inherit (haskell.lib.compose) justStaticExecutables;
-
-  drv = haskellPackages.callCabal2nix "easyscan" ./src { };
-in
-symlinkJoin {
+writeShellApplication {
   name = "easyscan";
-  paths = [ (justStaticExecutables drv) ];
-  buildInputs = [ makeWrapper ];
-  postBuild = ''
-    wrapProgram $out/bin/easyscan \
-      --prefix PATH : "${
-        lib.makeBinPath [
-          sane-backends
-          poppler-utils
-        ]
-      }"
-  '';
+
+  runtimeInputs = [
+    sane-backends
+    poppler-utils
+    fzf
+    ghostscript
+  ];
+
+  text = builtins.readFile ./easyscan.sh;
 }