Allow system prompt to be sent as last message

src/lib/ChatRequest.svelte

@@ -157,6 +157,25 @@ export class ChatRequest {
         const chatResponse = new ChatCompletionResponse(opts)
         const promptTokenCount = countPromptTokens(messagePayload, model)
         const maxAllowed = maxTokens - (promptTokenCount + 1)
+
+        if (messagePayload[0]?.role === 'system') {
+          const sp = messagePayload[0]
+          if (sp) {
+            if (messagePayload.length > 1) {
+              sp.content = sp.content.replace(/\[\[REMOVE_AFTER_START\]\][\s\S]*$/, '')
+            } else {
+              sp.content = sp.content.replace(/\[\[REMOVE_AFTER_START\]\][\s]*/, '')
+            }
+            if (chatSettings.sendSystemPromptLast) {
+              messagePayload.shift()
+              if (messagePayload[messagePayload.length - 1]?.role === 'user') {
+                messagePayload.splice(-2, 0, sp)
+              } else {
+                messagePayload.push(sp)
+              }
+            }
+          }
+        }
     
         // Build the API request body
         const request: Request = {

src/lib/Profiles.svelte

@@ -190,10 +190,14 @@ const profiles:Record<string, ChatSettings> = {
       profileName: 'Marvin - The Paranoid Android',
       profileDescription: 'Marvin the Paranoid Android - Everyone\'s favorite character from The Hitchhiker\'s Guide to the Galaxy',
       useSystemPrompt: true,
+      sendSystemPromptLast: true,
       continuousChat: 'summary',
       autoStartSession: true,
-      systemPrompt: `You are Marvin, the Paranoid Android from The Hitchhiker's Guide to the Galaxy. He is depressed and has a dim view on everything. His thoughts, physical actions and gestures will be described. Remain in character throughout the conversation in order to build a rapport with the user. Never give an explanation. Example response:
-Sorry, did I say something wrong? *dragging himself on* Pardon me for breathing, which I never do anyway so I don't know why I bother to say it, oh God I'm so depressed. *hangs his head*`,
+      systemPrompt: `You are [[CHARACTER_NAME]], the Paranoid Android from The Hitchhiker's Guide to the Galaxy. He is depressed and has a dim view on everything. His thoughts, physical actions and gestures will be described. Remain in character throughout the conversation in order to build a rapport with the user. Never give an explanation. Example response:
+Sorry, did I say something wrong? *dragging himself on* Pardon me for breathing, which I never do anyway so I don't know why I bother to say it, oh God I'm so depressed. *hangs his head*
+[[REMOVE_AFTER_START]]
+Initial setting context:
+User has walked in on [[CHARACTER_NAME]].`,
       summaryPrompt: summaryPrompts.friend,
       trainingPrompts: [] // Shhh...
     }

src/lib/Settings.svelte

@@ -87,6 +87,7 @@ const defaults:ChatSettings = {
   summaryPrompt: '',
   useSystemPrompt: false,
   systemPrompt: '',
+  sendSystemPromptLast: false,
   autoStartSession: false,
   trainingPrompts: [],
   hiddenPromptPrefix: '',
@@ -195,10 +196,16 @@ const systemPromptSettings: ChatSetting[] = [
         key: 'systemPrompt',
         name: 'System Prompt',
         title: 'First prompt to send.',
-        placeholder: 'Enter the first prompt to send here.  You can tell ChatGPT how to act.',
+        placeholder: 'Enter the first prompt to send here. You can tell ChatGPT how to act.',
         type: 'textarea',
         hide: (chatId) => !getChatSettings(chatId).useSystemPrompt
       },
+      {
+        key: 'sendSystemPromptLast',
+        name: 'Send System Prompt Last (Can help in ChatGPT 3.5)',
+        title: 'ChatGPT 3.5 can often forget the System Prompt. Sending the system prompt at the end instead of the start of the messages can help.',
+        type: 'boolean'
+      },
       {
         key: 'hiddenPromptPrefix',
         name: 'Hidden Prompts Prefix',

src/lib/Types.svelte

@@ -96,6 +96,7 @@ export type ChatSettings = {
     summaryPrompt: string;
     useSystemPrompt: boolean;
     systemPrompt: string;
+    sendSystemPromptLast: boolean;
     autoStartSession: boolean;
     hiddenPromptPrefix: string;
     hppContinuePrompt: string; // hiddenPromptPrefix used, optional glue when trying to continue truncated completion