simplex-chat/apps/simplex-calculator-bot

SimpleX Calculator

A pocket calculator in a chat, built with the SimpleX Chat Node.js library.

Each user who connects via the bot's business address gets their own chat with a calculator message. The keys are bot commands: tapping a key sends it to the bot, and the bot replaces the calculator message with the updated one.

How it works

• Keys are applied left to right, without operator priority: 2 + 3 × 4 = gives 20.
• % follows Apple's calculator: 100 + 15 % shows 15, and = gives 115; 50 × 10 % shows 0.1, and = gives 5.
• After =, the bot sends the calculation as a message, e.g. 2 + 2 = 4.
• Tapped keys are deleted from the chat; the calculation messages stay as a log.
• Users can also send a number or an expression, e.g. 12 × 3 + 4; the calculator shows the result.
• The calculator turns off after 10 minutes without use. Tap /calc or send an expression to turn it on.
• Apps that support commands made of symbols (chat protocol version 21) get keys like /+; older apps get keys like /add.

Install & build

cd apps/simplex-calculator-bot
npm install
npm run build

The bot requires a simplex-chat library version that passes the chat API to event handlers (7.1.0-beta.4.1 or later). To run against the in-tree library:

# In packages/simplex-chat-nodejs
npm link

# In apps/simplex-calculator-bot
npm link simplex-chat

Run

npm start

The bot prints its address on start. The database is stored in ./data.

Test

npm test