Files
sh f65c2da587 nodejs: lazy per-backend libsimplex download (#7543)
* ci: drop dlltool from nodejs libs release

* nodejs: download libsimplex into the user cache

* nodejs: load libsimplex at runtime per backend

* support bot: select db backend with --db

* python: match backend switch error text

* nodejs: download prebuilt add-on at runtime

* ci: build nodejs add-on for libs release

* calculator bot: load libs and add-on in image

* support bot: document add-on override

* nodejs: keep worker test output free of colors

* nodejs: verify sha-256 of downloaded assets

* python: pin core libs release with sha-256

* ci: add packages release script

* ci: release nodejs add-on and open release PR

* ci: publish packages after release PR

* nodejs: keep npm from building the add-on

* calculator bot: build the add-on in the image

* ci: merge package release workflows

* ci: open release PR when publishing fails

* ci: build the add-on with node-addon-api only

* ci: skip publishing in a called packages workflow

* ci: update package release actions to Node 24

* nodejs: fix receive test timeout

* ci: test packages on pull requests

* nodejs: reuse the database in the close stress test

* ci: keep failed package tests from hanging

* ci: skip preset server tests

* ci: plan package builds from the changes

* ci: test packages with a given libsimplex

* ci: test packages with libsimplex of core changes
2026-10-14 09:53:53 +01:00

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# SimpleX Calculator
A calculator bot built with the [SimpleX Chat Node.js library](../../packages/simplex-chat-nodejs/).
Each user who connects via the bot's business address receives a calculator message with keys as commands. The bot replaces this message after each input.
- `×` and `÷` are applied before `+` and `-`, so `2 + 3 × 4 =` equals 14.
- `%` is computed as in Apple's calculator: `100 + 15 % =` equals 115.
- Tap `C` to clear the number, and `C` again to clear the calculation.
- Numbers are shown without exponent, up to 15 digits; larger results are shown as `Error`.
- You can also send numbers and keys like `+`, `=`, `add` or `c`. Expressions like `(2 + 3) × 4` are entered as one number, and the bot replies to them with the result.
- The bot deletes keys and numbers, tapped or sent, and logs each computed operation, such as `15 + 10 = 25`.
- After 10 minutes without input, the bot turns the calculator off and discards the calculation; tap any key to turn it on.
- The bot sends keys like `/+` to apps with chat protocol version 21 or later, and keys like `/add` to older apps.
## Run
```bash
npm install
npm run build
npm start
```
The bot prints its address and keeps its data in `./data`.
To add a SimpleX name to the address, register the name with the address short link, and run `npm start -- --domain yourname.simplex`. The name is kept when the bot starts without `--domain`.
To use the library from this repository, build it and run `npm install --no-save ../../packages/simplex-chat-nodejs` instead of `npm install`, then start the bot with `SIMPLEX_ADDON_PATH=../../packages/simplex-chat-nodejs/build/Release/simplex.node`.
## Test
```bash
npm test
```
A local SMP server is started for the end-to-end test. On Linux, `smp-server` is downloaded from [simplexmq releases](https://github.com/simplex-chat/simplexmq/releases); to use another build, or on other systems, set `SMP_SERVER` to the path of `smp-server`.