add easter egg

Author: Hörmet Yiltiz

lisp_eval/__init__.py

@@ -96,7 +96,11 @@ def lang(self, value):
         print('Setting _lang to', self._lang)
         self.writeConfig('lang', value)
         self.call_external = self.lang_opts[self._lang]
-        self.iconUrls = [f"file:{Path(__file__).parent}/{self.call_external['url']}"]
+        icon_fname = Path(__file__).parent / self.call_external['url']
+        if icon_fname.exists():
+            self.iconUrls = [f"file:{icon_fname}"]
+        else:
+            self.iconUrls = [f"file:{Path(__file__).parent}" + "/lambda.svg"]
 
     def configWidget(self):
         return [

lisp_eval/config.json

@@ -32,6 +32,17 @@
         ],
         "url": "cuddles.png"
     },
+    "R": {
+        "prog": "R",
+        "args": ["--no-restore",
+            "--no-save",
+            "--no-readline",
+            "--quiet",
+            "--no-echo",
+            "-e",
+            "'{}'"],
+        "url": "r-is-also-a-lisp-shrug.png"
+    },
     "racket": {
         "prog": "racket",
         "args": [