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diff --git a/lib/tools/parse.nom b/lib/tools/parse.nom
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+#!/usr/bin/env nomsu -V6.14
+#
+    Tool to print out a parse tree of files in an easy-to-read format. Usage:
+    nomsu tools/parse.nom file1 file2 directory1 ...        
+    
+use "filesystem"
+use "commandline"
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+externally (print tree $t at indent $indent) means:
+    if $t.type is:
+        "Action":
+            say "\($indent)Action (\($t.stub)):"
+            for $arg in $t:
+                if ($arg is syntax tree):
+                    print tree $arg at indent "\$indent  "
+        
+        "MethodCall":
+            say "\($indent)MethodCall on:"
+            print tree $t.1 at indent "\$indent    "
+            print tree $t.2 at indent "\$indent    "
+        
+        "Number":
+            say "\$indent\($t.1)"
+        
+        "Var":
+            say "\($indent)$\($t.1)"
+        
+        else:
+            say "\$indent\($t.type):"
+            for $arg in $t:
+                when:
+                    ($arg is syntax tree):
+                        print tree $arg at indent "\$indent  "
+                    
+                    else:
+                        say "\$indent  \(quote $arg)"
+
+command line program with $args:
+    for $filename in $args.extras:
+        $file = (read file $filename)
+        unless $file:
+            fail "File does not exist: \$filename"
+        $nomsu = (NomsuCode from (Source $filename 1 (size of $file)) $file)
+        $tree = ($nomsu parsed)
+        print tree $tree at indent ""