From fb29dabb590f729b1f3189d1d69a74ab63f7a70b Mon Sep 17 00:00:00 2001
From: Tim Den Ouden <timothy.denouden@gmail.com>
Date: Wed, 12 Jul 2023 19:08:21 -0700
Subject: [PATCH] Add parameterless callable variables

---
 chevron/renderer.py |  3 +++
 test_spec.py        | 21 +++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/chevron/renderer.py b/chevron/renderer.py
index 65a00f6..0208259 100644
--- a/chevron/renderer.py
+++ b/chevron/renderer.py
@@ -231,6 +231,9 @@ def render(template='', data={}, partials_path='.', partials_ext='mustache',
         elif tag == 'variable':
             # Add the html escaped key to the output
             thing = _get_key(key, scopes, warn=warn, keep=keep, def_ldel=def_ldel, def_rdel=def_rdel)
+            if isinstance(thing, Callable):
+                # if the variable is a callable function with no arguments (inspired by Mustache.js) get its value.
+                thing = thing()
             if thing is True and key == '.':
                 # if we've coerced into a boolean by accident
                 # (inverted tags do this)
diff --git a/test_spec.py b/test_spec.py
index 905e105..6b1a670 100755
--- a/test_spec.py
+++ b/test_spec.py
@@ -355,6 +355,27 @@ def function(content, render):
         expected = 'partial content'
 
         self.assertEqual(result, expected)
+    
+    def test_callable_variables(self):
+        '''Test callable variables
+        '''
+
+        def subject():
+            return 'World'
+
+        args = {
+            'template': '{{greeting}} {{subject}}{{emphasis}}',
+            'data': {
+                "greeting": 'Hello',
+                "subject": subject,
+                "emphasis": '!'
+            }
+        }
+
+        result = chevron.render(**args)
+        expected = 'Hello World!'
+
+        self.assertEqual(result, expected)
 
     # https://github.com/noahmorrison/chevron/issues/35
     def test_custom_falsy(self):