add prompt templates as j2 templates

ollama/prompt.py

@@ -0,0 +1,19 @@
+from os import path
+from difflib import SequenceMatcher
+from jinja2 import Environment, PackageLoader
+
+
+def template(model, prompt):
+    best_ratio = 0
+    best_template = ''
+
+    environment = Environment(loader=PackageLoader(__name__, 'templates'))
+    for template in environment.list_templates():
+        base, _ = path.splitext(template)
+        ratio = SequenceMatcher(None, model.lower(), base).ratio()
+        if ratio > best_ratio:
+            best_ratio = ratio
+            best_template = template
+
+    template = environment.get_template(best_template)
+    return template.render(prompt=prompt)