Use maintainer scripts to set ‘adventure’ Debian alternatives.

debian/changelog

@@ -5,6 +5,8 @@ bsdgames (2.17-24) UNRELEASED; urgency=medium
   * adventure:
     - Declare “Provides: adventure” as this is one possible implementation
       of the Colossal Cave Adventure.
+    - Use Debian alternatives system to present ‘bsdgames-adventure’ as an
+      implementation of ‘adventure’.
 
  --
 

debian/postinst

@@ -71,9 +71,20 @@ chmod 664 $SCOREFILES
 # in them.
 chmod 660 /var/games/bsdgames/phantasia/characs
 
+ADVENTURE_PRIORITY=50
+
 case "$action" in
 
-    configure|abort-upgrade|abort-remove|abort-deconfigure)
+    configure)
+        update-alternatives --install \
+                /usr/games/adventure adventure \
+                /usr/games/bsdgames-adventure $ADVENTURE_PRIORITY \
+                --slave \
+                    /usr/share/man/man6/adventure.6.gz adventure.6.gz \
+                    /usr/share/man/man6/bsdgames-adventure.6.gz
+        ;;
+
+    abort-upgrade|abort-remove|abort-deconfigure)
         ;;
 
     *)

debian/prerm

@@ -21,7 +21,12 @@ action="$1"
 
 case "$action" in
 
-    remove|deconfigure|upgrade|failed-upgrade)
+    remove|deconfigure)
+        update-alternatives --remove \
+                adventure /usr/games/bsdgames-adventure
+        ;;
+
+    upgrade|failed-upgrade)
         ;;
 
     *)