Add (example) script to generate a patched nhdat.

This creates a copy of the oracle level on dungeon level 1.

nle/nethack/nethack.py

@@ -84,20 +84,23 @@ def __init__(
         options=None,
         copy=False,
         wizard=False,
+        hackdir=HACKDIR,
     ):
         self._copy = copy
 
-        if not os.path.exists(HACKDIR) or not os.path.exists(
-            os.path.join(HACKDIR, "sysconf")
+        if not os.path.exists(hackdir) or not os.path.exists(
+            os.path.join(hackdir, "sysconf")
         ):
-            raise FileNotFoundError("Couldn't find NetHack installation.")
+            raise FileNotFoundError(
+                "Couldn't find NetHack installation at '%s'." % hackdir
+            )
 
         # Create a HACKDIR for us.
         self._vardir = tempfile.mkdtemp(prefix="nle")
 
         # Symlink a few files.
         for fn in ["nhdat", "sysconf"]:
-            os.symlink(os.path.join(HACKDIR, fn), os.path.join(self._vardir, fn))
+            os.symlink(os.path.join(hackdir, fn), os.path.join(self._vardir, fn))
         # Touch a few files.
         for fn in ["perm", "logfile", "xlogfile"]:
             os.close(os.open(os.path.join(self._vardir, fn), os.O_CREAT))

nle/scripts/patch_nhdat.sh

@@ -0,0 +1,55 @@
+set -euo pipefail
+
+ORIGDIR=$(pwd)
+
+HACKDIR=$(python -c 'import pkg_resources; print(pkg_resources.resource_filename("nle", "nethackdir"), end="")')
+
+TMPDIR=$(mktemp -d)
+
+echo $TMPDIR
+
+mkdir $TMPDIR/dat
+cd $TMPDIR/dat
+cp $HACKDIR/dat/dungeon.def .
+patch --ignore-whitespace <<'EOF'
+--- dungeon.def    2019-03-01 15:21:08.000000000 +0100
++++ dungeon.def    2020-09-23 19:17:51.000000000 +0200
+@@ -15,6 +15,7 @@
+ #
+
+ DUNGEON:       "The Dungeons of Doom" "D" (25, 5)
++LEVEL:         "mylevel" "none" @ (1,1)
+ ALIGNMENT:     unaligned
+ BRANCH:                "The Gnomish Mines" @ (2, 3)
+ LEVEL:         "rogue" "R" @ (15, 4)
+
+EOF
+$HACKDIR/makedefs -e  # Looks for ../dat/dungeon.def.
+$HACKDIR/dgn_comp dungeon.pdf
+
+cp $HACKDIR/dat/oracle.des mylevel.des
+patch --ignore-whitespace <<'EOF'
+--- mylevel.des    2019-03-01 15:21:08.000000000 +0100
++++ mylevel.des    2020-09-23 19:01:56.000000000 +0200
+@@ -5,7 +5,7 @@
+ # Oracle level
+ #
+
+-LEVEL: "oracle"
++LEVEL: "mylevel"
+
+ ROOM: "ordinary" , lit, (3,3), (center,center), (11,9) {
+   OBJECT:('`',"statue"),(0,0),montype:'C',1
+EOF
+$HACKDIR/lev_comp mylevel.des
+
+mkdir $TMPDIR/contents
+cd $TMPDIR/contents
+$HACKDIR/dlb xf $HACKDIR/nhdat
+cp -f ../dat/dungeon ../dat/mylevel.lev .
+$HACKDIR/dlb cf nhdat *
+cp nhdat $ORIGDIR
+
+cd $ORIGDIR
+
+rm -rf $TMPDIR