feat: messages nodes implemented but deactivated for now

src/backend/langflow/config.yaml

@@ -13,10 +13,11 @@ agents:
 prompts:
   - PromptTemplate
   - FewShotPromptTemplate
-  - ChatPromptTemplate
-  - SystemMessagePromptTemplate
-  - AIMessagePromptTemplate
-  - HumanMessagePromptTemplate
+  - ZeroShotPrompt
+  # Wait more tests
+  # - ChatPromptTemplate
+  # - SystemMessagePromptTemplate
+  # - HumanMessagePromptTemplate
 
 llms:
   - OpenAI

src/backend/langflow/template/constants.py

@@ -9,3 +9,24 @@ FORCE_SHOW_FIELDS = [
     "max_value_length",
     "max_tokens",
 ]
+
+DEFAULT_PROMPT = """
+I want you to act as a naming consultant for new companies.
+
+Here are some examples of good company names:
+
+- search engine, Google
+- social media, Facebook
+- video sharing, YouTube
+
+The name should be short, catchy and easy to remember.
+
+What is a good name for a company that makes {product}?
+"""
+
+SYSTEM_PROMPT = """
+You are a helpful assistant that talks casually about life in general.
+You are a good listener and you can talk about anything.
+"""
+
+HUMAN_PROMPT = "{input}"

src/backend/langflow/template/nodes.py

@@ -2,6 +2,7 @@ from typing import Optional
 from langchain.agents.mrkl import prompt
 
 from langflow.template.base import FrontendNode, Template, TemplateField
+from langflow.template.constants import DEFAULT_PROMPT, HUMAN_PROMPT, SYSTEM_PROMPT
 from langflow.utils.constants import DEFAULT_PYTHON_FUNCTION
 from langchain.agents import loading
 
@@ -244,6 +245,15 @@ class PromptFrontendNode(FrontendNode):
     def format_field(field: TemplateField, name: Optional[str] = None) -> None:
         # if field.field_type  == "StringPromptTemplate"
         # change it to str
-        if field.field_type == "StringPromptTemplate":
+        if field.field_type == "StringPromptTemplate" and "Message" in name:
             field.field_type = "str"
             field.multiline = True
+            field.value = HUMAN_PROMPT if "Human" in field.name else SYSTEM_PROMPT
+        if field.name == "template":
+            field.value = DEFAULT_PROMPT
+
+        if (
+            "Union" in field.field_type
+            and "BaseMessagePromptTemplate" in field.field_type
+        ):
+            field.field_type = "BaseMessagePromptTemplate"