Tags
https://www.youtube.com/watch?v=03KsS09YS4E&t=610s
Today I learned about the basic calculator, bc. At the very end of this video prime uses it to add numbers in vim.
REPL
You can start a calculator repl at the command line, by running bc.
Vim
Since bc supports standard unix pipes you can easily pipe data from vim into bc
and back out using !!bc. All you need is a string of math on the line you
want to calculate, go to normal mode and run !!bc to get the answer.
Traditionally I will open my system calculator or ipython to do something like this.
To keep the equation and the result in the same line you can send the equation to stderr and the result to stdout using tee.
:.!tee >(cat >&2) | bc