From 6306f811c7d8a0cd893a0ad1fbcae9e701de3c64 Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@araneo.org>
Date: Fri, 28 Aug 2015 17:15:24 +0200
Subject: Add a simple hint function for sister_2

---
 .../problems/family_relations/sister_2/common.py   |  5 +++++
 prolog/problems/family_relations/sister_2/en.py    | 23 +++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

(limited to 'prolog')

diff --git a/prolog/problems/family_relations/sister_2/common.py b/prolog/problems/family_relations/sister_2/common.py
index 2c9528e..9be9e6d 100644
--- a/prolog/problems/family_relations/sister_2/common.py
+++ b/prolog/problems/family_relations/sister_2/common.py
@@ -45,3 +45,8 @@ def test(program):
             prolog.engine.destroy(engine_id)
 
     return n_correct, len(queries)
+
+def hint(program):
+    if '\=' not in program and '\==' not in program:
+        return [{'id': 'x_y_must_be_different'}]
+    return None
diff --git a/prolog/problems/family_relations/sister_2/en.py b/prolog/problems/family_relations/sister_2/en.py
index d8395c0..629123c 100644
--- a/prolog/problems/family_relations/sister_2/en.py
+++ b/prolog/problems/family_relations/sister_2/en.py
@@ -11,4 +11,25 @@ description = '''\
     X = patricia.
 </pre>'''
 
-hint = {}
+hint = {
+    'x_y_must_be_different': '''\
+<p>What if <code>X</code> and <code>Y</code> are the same person? Try the
+following query:</p>
+<pre>
+?- sister(sally, Y).
+</pre>
+''',
+
+    # TODO move to generic prolog/en.py
+    'no_hint': '''\
+<p>No hint available, sorry! Try to use thinking instead.</p>
+''',
+
+    # TODO move to generic prolog/en.py
+    'syntax_error': '''\
+<p>Your code contains syntactic mistakes. The Prolog compiler emitted the following messages:</p>
+<pre>
+[%=messages%]
+</pre>
+''',
+}
-- 
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