Telegram Expense Tracker
Expense_Bot is an single-entry accounting bot for Telegram, created for their 2016 #BotPrize competition. It is built with NodeJS and RethinkDB. Expense_Bot leverages several packages in the rich npm ecosystem to create Excel spreadsheets for data export and pie charts for visualization. It implements a state machine in RethinkDB to maintain context for incoming messages. This can be modelled by the flowchart below.
To read more about the technical detail behind Expense_Bot, check out my blog post "Building a Chat Bot for Fun and Profit".
/start - Returns this list of commands /newaccount - Create a new account /accounts - List accounts /transaction - Log transaction (expense or income) /history - List previous transaction history /charts - View a chart image summary of your expenses and income /spreadsheet - Download full data /delete - Delete a transaction (expense or income) /deleteaccount - Delete an account /deleteall - Delete all info Expense_Bot knows about you /cancel - Cancel current operation