improve replies, formatting and system prompt handling

src/commands/gemini-chat.ts

@@ -44,7 +44,10 @@ export class GeminiChat extends ChatCommand {
             };
         });
         chatMessages.reverse();
-        chatMessages.unshift({role: "system", content: Environment.SYSTEM_PROMPT});
+
+        if (Environment.SYSTEM_PROMPT) {
+            chatMessages.unshift({role: "system", content: Environment.SYSTEM_PROMPT});
+        }
 
         let chatContent = "";
         for (const part of chatMessages) {

src/commands/mistral-chat.ts

@@ -58,7 +58,10 @@ export class MistralChat extends ChatCommand {
             };
         });
         chatMessages.reverse();
-        chatMessages.unshift({role: "system", content: [{type: "text", text: Environment.SYSTEM_PROMPT}]});
+
+        if (Environment.SYSTEM_PROMPT) {
+            chatMessages.unshift({role: "system", content: [{type: "text", text: Environment.SYSTEM_PROMPT}]});
+        }
 
         let waitMessage: Message;
 
@@ -116,7 +119,7 @@ export class MistralChat extends ChatCommand {
                             chat_id: chatId,
                             message_id: waitMessage.message_id,
                             text: escapeMarkdownV2Text(text),
-                            parse_mode: "Markdown"
+                            parse_mode: "MarkdownV2"
                         }
                     ).catch(logError);
 

src/commands/ollama-chat.ts

@@ -44,7 +44,10 @@ export class OllamaChat extends ChatCommand {
             };
         });
         chatMessages.reverse();
-        chatMessages.unshift({role: "system", content: Environment.SYSTEM_PROMPT, images: []});
+
+        if (Environment.SYSTEM_PROMPT) {
+            chatMessages.unshift({role: "system", content: Environment.SYSTEM_PROMPT, images: []});
+        }
 
         let waitMessage: Message;
 

src/commands/openai-chat.ts

@@ -58,11 +58,14 @@ export class OpenAIChat extends ChatCommand {
             };
         });
         chatMessages.reverse();
-        chatMessages.unshift({
-            role: "system",
-            content: [{type: "input_text", text: Environment.SYSTEM_PROMPT}],
-            type: "message"
-        });
+
+        if (Environment.SYSTEM_PROMPT) {
+            chatMessages.unshift({
+                role: "system",
+                content: [{type: "input_text", text: Environment.SYSTEM_PROMPT}],
+                type: "message"
+            });
+        }
 
         let waitMessage: Message;
 

src/common/environment.ts

@@ -112,8 +112,6 @@ export class Environment {
             Environment.IMAGE_HANDLE_FALLBACK_POLICY = ImageHandleFallbackPolicy.NOTIFY_USER;
         }
 
-        Environment.SYSTEM_PROMPT = process.env.SYSTEM_PROMPT?.trim();
-
         Environment.OLLAMA_ADDRESS = process.env.OLLAMA_ADDRESS;
         Environment.OLLAMA_MODEL = process.env.OLLAMA_MODEL || "gemma3:4b";
         Environment.OLLAMA_IMAGE_MODEL = process.env.OLLAMA_IMAGE_MODEL || Environment.OLLAMA_MODEL;
@@ -133,6 +131,10 @@ export class Environment {
         Environment.OPENAI_IMAGE_MODEL = process.env.OPENAI_IMAGE_MODEL || "gpt-image-1-mini";
     }
 
+    static setSystemPrompt(prompt: string) {
+        this.SYSTEM_PROMPT = prompt;
+    }
+
     static setAdmins(admins: Set<number>) {
         this.ADMIN_IDS = admins;
     }

src/db/database.ts

@@ -2,6 +2,7 @@ import * as fs from "fs";
 import {Environment} from "../common/environment";
 import {logError} from "../util/utils";
 import {Answers} from "../model/answers";
+import path from "node:path";
 
 type DataJsonFile = {
     admins: number[]
@@ -27,6 +28,19 @@ export async function readData(): Promise<void> {
     }
 }
 
+export async function readPrompts(): Promise<void> {
+    try {
+        const prompt = fs.readFileSync(path.join(Environment.DATA_PATH, "system_prompt.txt")).toString().trim();
+        if (prompt.length) {
+            Environment.setSystemPrompt(prompt);
+        }
+    } catch (e) {
+        logError(e);
+    }
+
+    return Promise.resolve();
+}
+
 export async function saveData(): Promise<void> {
     const adminIds: number[] = [];
     Environment.ADMIN_IDS.forEach(id => adminIds.push(id));

src/index.ts

@@ -20,7 +20,7 @@ import {Ping} from "./commands/ping";
 import {RandomString} from "./commands/random-string";
 import {SystemInfo} from "./commands/system-info";
 import {Test} from "./commands/test";
-import {readData, retrieveAnswers} from "./db/database";
+import {readData, readPrompts, retrieveAnswers} from "./db/database";
 import {Uptime} from "./commands/uptime";
 import {WhatBetter} from "./commands/what-better";
 import {When} from "./commands/when";
@@ -252,6 +252,10 @@ async function shutdown(signal: NodeJS.Signals) {
 async function main() {
     const start = Date.now();
 
+    await readPrompts();
+
+    console.log(Environment.SYSTEM_PROMPT);
+    
     console.log(
         `TEST_ENVIRONMENT: ${Environment.TEST_ENVIRONMENT}\n` +
         `DATA_PATH: ${Environment.DATA_PATH}\n` +

src/util/utils.ts

@@ -452,12 +452,221 @@ export const delay = (ms: number, signal?: AbortSignal): Promise<void> =>
         }
     });
 
-export function escapeMarkdownV2Text(s: string) {
-    s = s.replace(/^\*{3,}\s*$/gm, "— — —");
-    s = s.replace(/^\*\s+(?=\S)/gm, "• ");
-    s = s.replace(/\*\*(.+?)\*\*/g, "*$1*");
+const MARKDOWN_V2_RESERVED_RE = /([\\_*\[\]()~`>#+\-=|{}.!])/g;
 
-    return s;
+function escapePlainMarkdownV2(s: string): string {
+    return s.replace(MARKDOWN_V2_RESERVED_RE, "\\$1");
+}
+
+function escapeCodeMarkdownV2(s: string): string {
+    return s.replace(/[\\`]/g, "\\$&");
+}
+
+function escapeLinkUrlMarkdownV2(s: string): string {
+    return s.replace(/[\\)]/g, "\\$&");
+}
+
+function escapeMarkdownV2PreservingAllowedFormatting(s: string): string {
+    let result = "";
+    let i = 0;
+
+    while (i < s.length) {
+        // links: [text](url)
+        if (s[i] === "[") {
+            const linkMatch = s.slice(i).match(/^\[([^\]\n]+)]\(([^)\n]+)\)/);
+
+            if (linkMatch) {
+                const [, text, url] = linkMatch;
+                result += `[${escapePlainMarkdownV2(text)}](${escapeLinkUrlMarkdownV2(url)})`;
+                i += linkMatch[0].length;
+                continue;
+            }
+        }
+
+        // monospace: `text`
+        if (s[i] === "`") {
+            const end = s.indexOf("`", i + 1);
+
+            if (end !== -1) {
+                const content = s.slice(i + 1, end);
+                result += "`" + escapeCodeMarkdownV2(content) + "`";
+                i = end + 1;
+                continue;
+            }
+        }
+
+        // spoiler: ||text||
+        if (s.startsWith("||", i)) {
+            const end = s.indexOf("||", i + 2);
+
+            if (end !== -1) {
+                const content = s.slice(i + 2, end);
+                result += "||" + escapeMarkdownV2PreservingAllowedFormatting(content) + "||";
+                i = end + 2;
+                continue;
+            }
+        }
+
+        // underline: __text__
+        if (s.startsWith("__", i)) {
+            const end = s.indexOf("__", i + 2);
+
+            if (end !== -1) {
+                const content = s.slice(i + 2, end);
+                result += "__" + escapeMarkdownV2PreservingAllowedFormatting(content) + "__";
+                i = end + 2;
+                continue;
+            }
+        }
+
+        // bold: *text*
+        if (s[i] === "*") {
+            const end = s.indexOf("*", i + 1);
+
+            if (end !== -1) {
+                const content = s.slice(i + 1, end);
+                result += "*" + escapeMarkdownV2PreservingAllowedFormatting(content) + "*";
+                i = end + 1;
+                continue;
+            }
+        }
+
+        // italic: _text_
+        if (s[i] === "_") {
+            const end = s.indexOf("_", i + 1);
+
+            if (end !== -1) {
+                const content = s.slice(i + 1, end);
+                result += "_" + escapeMarkdownV2PreservingAllowedFormatting(content) + "_";
+                i = end + 1;
+                continue;
+            }
+        }
+
+        // strikethrough: ~text~
+        if (s[i] === "~") {
+            const end = s.indexOf("~", i + 1);
+
+            if (end !== -1) {
+                const content = s.slice(i + 1, end);
+                result += "~" + escapeMarkdownV2PreservingAllowedFormatting(content) + "~";
+                i = end + 1;
+                continue;
+            }
+        }
+
+        result += escapePlainMarkdownV2(s[i]);
+        i++;
+    }
+
+    return result;
+}
+
+function unescapeAccidentalMarkdownV2(s: string): string {
+    return s.replace(/\\([_*\[\]()~`>#+\-=|{}.!\\])/g, "$1");
+}
+
+function escapeTelegramQuoteLine(line: string): string {
+    const content = line.replace(/^>\s*/, "");
+
+    if (!content.trim()) {
+        return ">";
+    }
+
+    return ">" + escapeMarkdownV2PreservingAllowedFormatting(content);
+}
+
+function normalizeTelegramQuoteLines(s: string): string {
+    return s
+        .split("\n")
+        .map(line => {
+            if (!line.startsWith(">")) return line;
+
+            return line.replace(/^>\s+/, ">");
+        })
+        .join("\n");
+}
+
+function looksLikeMarkdownTableRow(line: string): boolean {
+    const trimmed = line.trim();
+
+    if (trimmed.startsWith("||") && trimmed.endsWith("||")) {
+        return false;
+    }
+
+    const pipeCount = (trimmed.match(/\|/g) ?? []).length;
+
+    if (pipeCount < 2) {
+        return false;
+    }
+
+    return trimmed.startsWith("|") || trimmed.endsWith("|") || pipeCount >= 2;
+}
+
+function isMarkdownTableSeparator(line: string): boolean {
+    return /^\s*\|?\s*:?-{3,}:?\s*(\|\s*:?-{3,}:?\s*)+\|?\s*$/.test(line);
+}
+
+function normalizeMarkdownTables(s: string): string {
+    return s
+        .split("\n")
+        .filter(line => !isMarkdownTableSeparator(line))
+        .map(line => {
+            if (!looksLikeMarkdownTableRow(line)) {
+                return line;
+            }
+
+            return line
+                .replace(/^\s*\|/, "")
+                .replace(/\|\s*$/, "")
+                .split("|")
+                .map(cell => cell.trim())
+                .filter(Boolean)
+                .join(" — ");
+        })
+        .join("\n");
+}
+
+export function escapeMarkdownV2Text(s: string): string {
+    s = unescapeAccidentalMarkdownV2(s);
+    s = normalizeTelegramQuoteLines(s);
+
+    s = s.replace(/\r\n/g, "\n").replace(/\r/g, "\n");
+
+    s = s.replace(/^\s*[-*_]{3,}\s*$/gm, "— — —");
+    s = s.replace(/^\s*[-*+]\s+(?=\S)/gm, "• ");
+    s = s.replace(/\*\*(.+?)\*\*/gs, "*$1*");
+    s = s.replace(/~~(.+?)~~/gs, "~$1~");
+    s = s.replace(/^#{1,6}\s+/gm, "");
+
+    s = s.replace(/```[a-zA-Z0-9_-]*\n?([\s\S]*?)```/g, (_, code) => {
+        return code.trim();
+    });
+
+    s = s.replace(/!\[([^\]]*)]\(([^)]+)\)/g, (_, alt, url) => {
+        return alt ? `${alt}: ${url}` : url;
+    });
+
+    s = normalizeMarkdownTables(s);
+
+    s = s
+        .split("\n")
+        .map(line => {
+            if (line.startsWith(">")) {
+                return escapeTelegramQuoteLine(line);
+            }
+
+            if (line === ">") {
+                return ">";
+            }
+
+            return escapeMarkdownV2PreservingAllowedFormatting(line);
+        })
+        .join("\n");
+
+    s = s.replace(/\n{3,}/g, "\n\n");
+
+    return s.trim();
 }
 
 export async function getFileUrl(fileId: string): Promise<string> {