fix(ui): gradio bug fixes (#2021)

* fix: when two user messages were sent

* fix: add source divider

* fix: add favicon

* fix: add zylon link

* refactor: update label

private_gpt/ui/ui.py

@@ -1,6 +1,5 @@
 """This file should be imported if and only if you want to run the UI locally."""
-
-import itertools
+import base64
 import logging
 import time
 from collections.abc import Iterable
@@ -31,7 +30,7 @@
 
 UI_TAB_TITLE = "My Private GPT"
 
-SOURCES_SEPARATOR = "\n\n Sources: \n"
+SOURCES_SEPARATOR = "<hr>Sources: \n"
 
 MODES = ["Query Files", "Search Files", "LLM Chat (no context from files)"]
 
@@ -109,25 +108,25 @@ def yield_deltas(completion_gen: CompletionGen) -> Iterable[str]:
                             + f"{index}. {source.file} (page {source.page}) \n\n"
                         )
                         used_files.add(f"{source.file}-{source.page}")
+                sources_text += "<hr>\n\n"
                 full_response += sources_text
             yield full_response
 
         def build_history() -> list[ChatMessage]:
-            history_messages: list[ChatMessage] = list(
-                itertools.chain(
-                    *[
-                        [
-                            ChatMessage(content=interaction[0], role=MessageRole.USER),
-                            ChatMessage(
-                                # Remove from history content the Sources information
-                                content=interaction[1].split(SOURCES_SEPARATOR)[0],
-                                role=MessageRole.ASSISTANT,
-                            ),
-                        ]
-                        for interaction in history
-                    ]
+            history_messages: list[ChatMessage] = []
+
+            for interaction in history:
+                history_messages.append(
+                    ChatMessage(content=interaction[0], role=MessageRole.USER)
                 )
-            )
+                if len(interaction) > 1 and interaction[1] is not None:
+                    history_messages.append(
+                        ChatMessage(
+                            # Remove from history content the Sources information
+                            content=interaction[1].split(SOURCES_SEPARATOR)[0],
+                            role=MessageRole.ASSISTANT,
+                        )
+                    )
 
             # max 20 messages to try to avoid context overflow
             return history_messages[:20]
@@ -314,7 +313,13 @@ def _build_ui_blocks(self) -> gr.Blocks:
             ".contain { display: flex !important; flex-direction: column !important; }"
             "#component-0, #component-3, #component-10, #component-8  { height: 100% !important; }"
             "#chatbot { flex-grow: 1 !important; overflow: auto !important;}"
-            "#col { height: calc(100vh - 112px - 16px) !important; }",
+            "#col { height: calc(100vh - 112px - 16px) !important; }"
+            "hr { margin-top: 1em; margin-bottom: 1em; border: 0; border-top: 1px solid #FFF; }"
+            ".avatar-image { background-color: antiquewhite; border-radius: 2px; }"
+            ".footer { text-align: center; margin-top: 20px; font-size: 14px; display: flex; align-items: center; justify-content: center; }"
+            ".footer-zylon-link { display:flex; margin-left: 5px; text-decoration: auto; color: #fff; }"
+            ".footer-zylon-link:hover { color: #C7BAFF; }"
+            ".footer-zylon-ico { height: 20px; margin-left: 5px; background-color: antiquewhite; border-radius: 2px; }",
         ) as blocks:
             with gr.Row():
                 gr.HTML(f"<div class='logo'/><img src={logo_svg} alt=PrivateGPT></div")
@@ -477,6 +482,14 @@ def get_model_label() -> str | None:
                         ),
                         additional_inputs=[mode, upload_button, system_prompt_input],
                     )
+
+            with gr.Row():
+                avatar_byte = AVATAR_BOT.read_bytes()
+                f_base64 = f"data:image/png;base64,{base64.b64encode(avatar_byte).decode('utf-8')}"
+                gr.HTML(
+                    f"<div class='footer'><a class='footer-zylon-link' href='https://zylon.ai/'>Maintained by Zylon <img class='footer-zylon-ico' src='{f_base64}' alt=Zylon></a></div>"
+                )
+
         return blocks
 
     def get_ui_blocks(self) -> gr.Blocks:
@@ -488,7 +501,7 @@ def mount_in_app(self, app: FastAPI, path: str) -> None:
         blocks = self.get_ui_blocks()
         blocks.queue()
         logger.info("Mounting the gradio UI, at path=%s", path)
-        gr.mount_gradio_app(app, blocks, path=path)
+        gr.mount_gradio_app(app, blocks, path=path, favicon_path=AVATAR_BOT)
 
 
 if __name__ == "__main__":