p2

p2 is a tiny Go CLI for printing powers of 2 through 2^32.

What it does

• p2 prints the default list from 2^0 to 2^16
• p2 5 prints 2^5 = 32
• p2 0..8 prints exponents 0 through 8
• p2 1-16 does the same with a shorter range alias
• p2 30000 finds the closest supported power of 2 and prints 2^15 = 32,768
• p2 30,000 works too
• Exact midpoint ties return both matches on separate lines, for example p2 48 prints 2^5 = 32 and 2^6 = 64
• By default, single-result lookups also copy the raw numeric value to your clipboard
• Optional user config controls list bounds, comma formatting, and clipboard copy for single-result lookups
• p2 --config walks you through a simple interactive setup
• p2 --reset restores a clean default config file

Install

Install into ~/.local/bin:

./install.sh

This install path builds p2 from source, so it requires Go to be installed locally.

Install into a custom location:

BINDIR="$HOME/bin" ./install.sh

Build manually:

go build ./cmd/p2

Usage

p2
p2 5
p2 0..8
p2 1-16
p2 30000
p2 48
p2 --help
p2 --config
p2 --reset

Config

p2 reads an optional user config file from your platform config directory:

• macOS: ~/Library/Application Support/p2/config.json
• Linux: ~/.config/p2/config.json
• Windows: %AppData%\p2\config.json

Example:

{
  "lower_bound": 5,
  "upper_bound": 8,
  "use_commas": true,
  "copy_single_to_clipboard": true
}

Notes:

• lower_bound and upper_bound affect bare p2 only
• explicit ranges like p2 0..32 and p2 16-5 ignore config bounds
• descending ranges normalize to ascending output
• ranges are exponent-only input; nearest-by-value lookup remains single-number-only
• comma-separated lists such as p2 0,1,5,32 are not supported
• fresh installs default to upper_bound: 16, even when no config file exists yet
• use_commas changes display formatting only
• copy_single_to_clipboard defaults to true
• single-result lookups copy the raw numeric value without commas
• the config file is created when you run p2 --config or p2 --reset

Development

go test ./...
go build ./cmd/p2

License

This project is licensed under the MIT License.