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Powers and remainders in the calculator (closes #3)
internal/calc gets its own tokenizer and precedence-climbing parser in
place of go/parser, which cannot express a power operator; go/constant
still computes. ^ (also **) binds tighter than * / % and a sign on its
left, and groups to the right. % takes the sign of the divisor and is
exact on decimals. A whole exponent is computed exactly while the
result's numerator and denominator stay within 4096 bits; otherwise,
and for a fractional exponent, in float64. A remainder, or the sign of
a negative base's power, that depends on a value go/constant holds
rounded is refused as too large. The welcome text and the replies
mention the new operators; a negative base with a fractional exponent
gets its own reply.

Model: opus-5-5
2026-09-29 00:08:26 +00:00

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# Workflow
- branch (from `main`)
- do the work in Next Step
- move Next Step to the top of Completed Steps
- move the top item of Future Steps into Next Step
- commit (`docs/TODO.md` changes in the same commit as the work)
- merge to `main` if the branch is not protected, otherwise open a PR
- push
# Status
pre-1.0. No git tags exist. `main` is a working bot: one container image
holding the bot and the SimpleX Chat command-line client v7.0.2, a bot
profile named `calc` with a long-term address that accepts every contact
request, and exact arithmetic replies (`+ - * /`, parentheses,
decimals). The Gitea issue tracker is the authoritative list of work;
this file mirrors it.
# Next Step
Adopt the canonical `.golangci.yml` from the `prompts` repository once
it replaces `gomodguard` with `gomodguard_v2`. golangci-lint v2.12.2
warns on every run that `gomodguard` is deprecated. The file is
maintained upstream and is not edited here; done when `make lint` runs
with no deprecation warning.
# Completed Steps
- 2026-09-28 Powers (`^`, also written `**`) and remainders (`%`) in
`internal/calc`, which now reads expressions with a parser of its own
in place of `go/parser`
- 2026-09-28 Moved the command tree and the `run` and `version` commands
from `cmd/simplexcalc/` into `internal/cli`; `cmd/simplexcalc/main.go`
is now a single call to `cli.Main`
- 2026-09-26 Seeded from `go-template-repo` (renamed, its HTTP service
removed) and built the bot: `internal/calc` for the arithmetic,
`internal/simplex` for the chat client process and its WebSocket API,
`internal/bot` for address setup and replies, and a runtime image on
Ubuntu 22.04 carrying the checksum-verified `simplex-chat` binary
# Future Steps
none