nix: add package for database with WAL enabled

flake.nix

@@ -129,6 +129,12 @@
         inherit src;
       };
 
+      database-wal = pkgs.callPackage ./nix/database.nix {
+        inherit (self.packages.${system}) database-tool jmdict radkfile kanjidic2;
+        inherit src;
+        wal = true;
+      };
+
       docs = pkgs.callPackage ./nix/docs.nix {
         inherit (self.packages.${system}) database;
       };

nix/database.nix

@@ -7,6 +7,7 @@
   radkfile,
   kanjidic2,
   sqlite,
+  wal ? false,
 }:
 stdenvNoCC.mkDerivation {
   name = "jadb";
@@ -29,7 +30,9 @@ stdenvNoCC.mkDerivation {
       sqlite3 jadb.sqlite < "$migration"
     done
 
-    "${lib.getExe database-tool}" create-db --libsqlite "${sqlite.out}/lib/libsqlite3.so"
+    "${lib.getExe database-tool}" create-db \
+      ${lib.optionalString wal "--wal"}  \
+      --libsqlite "${sqlite.out}/lib/libsqlite3.so"
 
     runHook postBuild
   '';