dwarf-fortress: Add "lazy pack", config flags and some comments.

pkgs/games/dwarf-fortress/wrapper/default.nix

@@ -5,6 +5,10 @@
 , enableTWBT ? false, twbt
 , themes ? {}
 , theme ? null
+# General config options:
+, enableIntro ? true
+, enableTruetype ? true
+, enableFPS ? false
 }:
 
 let
@@ -36,11 +40,24 @@ let
     pathsToLink = [ "/" "/hack" "/hack/scripts" ];
     ignoreCollisions = true;
 
-    postBuild = lib.optionalString enableDFHack ''
+    postBuild = ''
+      # De-symlink init.txt
+      cp $out/data/init/init.txt init.txt
+      rm $out/data/init/init.txt
+      mv init.txt $out/data/init/init.txt
+    '' + lib.optionalString enableDFHack ''
       rm $out/hack/symbols.xml
       substitute ${dfhack_}/hack/symbols.xml $out/hack/symbols.xml \
         --replace $(cat ${dwarf-fortress-original}/hash.md5.orig) \
                   $(cat ${dwarf-fortress-original}/hash.md5)
+    '' + lib.optionalString enableTWBT ''
+      substituteInPlace $out/data/init/init.txt \
+        --replace '[PRINT_MODE:2D]' '[PRINT_MODE:TWBT]'
+    '' + ''
+      substituteInPlace $out/data/init/init.txt \
+        --replace '[INTRO:YES]' '[INTRO:${unBool enableIntro}]' \
+        --replace '[TRUETYPE:YES]' '[TRUETYPE:${unBool enableTruetype}]' \
+        --replace '[FPS:NO]' '[FPS:${unBool enableFPS}]'
     '';
   };
 in