Update gif for readme and add input param to every components (#3145)

### What problem does this PR solve?


### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update

agent/component/base.py

@@ -36,6 +36,7 @@ class ComponentParamBase(ABC):
     def __init__(self):
         self.output_var_name = "output"
         self.message_history_window_size = 22
+        self.query = []
 
     def set_name(self, name: str):
         self._name = name
@@ -436,6 +437,16 @@ class ComponentBase(ABC):
         setattr(self._param, self._param.output_var_name, v)
 
     def get_input(self):
+        if self._param.query:
+            outs = []
+            for q in self._param.query:
+                if q["value"]: outs.append(pd.DataFrame([{"content": q["value"]}]))
+                if q["component_id"]: outs.append(self._canvas.get_component(q["component_id"])["obj"].output(allow_partial=False)[1])
+            if outs:
+                df = pd.concat(outs, ignore_index=True)
+                if "content" in df: df = df.drop_duplicates(subset=['content']).reset_index(drop=True)
+                return df
+
         upstream_outs = []
         reversed_cpnts = []
         if len(self._canvas.path) > 1:

agent/component/generate.py

@@ -130,6 +130,7 @@ class Generate(ComponentBase):
 
         msg = self._canvas.get_history(self._param.message_history_window_size)
         _, msg = message_fit_in([{"role": "system", "content": prompt}, *msg], int(chat_mdl.max_length * 0.97))
+        if len(msg) < 2: msg.append({"role": "user", "content": ""})
         ans = chat_mdl.chat(msg[0]["content"], msg[1:], self._param.gen_conf())
 
         if self._param.cite and "content_ltks" in retrieval_res.columns and "vector" in retrieval_res.columns:
@@ -149,6 +150,7 @@ class Generate(ComponentBase):
 
         msg = self._canvas.get_history(self._param.message_history_window_size)
         _, msg = message_fit_in([{"role": "system", "content": prompt}, *msg], int(chat_mdl.max_length * 0.97))
+        if len(msg) < 2: msg.append({"role": "user", "content": ""})
         answer = ""
         for ans in chat_mdl.chat_streamly(msg[0]["content"], msg[1:], self._param.gen_conf()):
             res = {"content": ans, "reference": []}

agent/component/invoke.py

@@ -51,6 +51,9 @@ class Invoke(ComponentBase, ABC):
         for para in self._param.variables:
             if para.get("component_id"):
                 cpn = self._canvas.get_component(para["component_id"])["obj"]
+                if cpn.component_name.lower() == "answer":
+                    args[para["key"]] = self._canvas.get_history(1)[0]["content"]
+                    continue
                 _, out = cpn.output(allow_partial=False)
                 args[para["key"]] = "\n".join(out["content"])
             else: