[ FR ] expose number base conversion to ysh

[glyh]

Currently there's no way to do so.

[glyh]

Also it looks like there's no sane way to hack out a solution without using source. This won't work.

func parseBase(num_string, base) {
  shopt --unset ysh:all {
    eval """
      write -n \$(($base#$num_string)) 
    """
  }
}

Related: https://github.com/oilshell/oil/issues/428#issuecomment-2041158822

[andychu]

OK, I guess we can put this in the same place that Python puts it? Not sure what JS does

ysh andy@andy-VirtualBox:~/git/oilshell/oil$ = int('15', 3)
  = int('15', 3)
              ^
[ interactive ]:5: fatal: Expected 1 typed args, but got 2

open to API ideas

[glyh]

JS

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt

• parseInt('ff', 16)

  Elixir

• https://hexdocs.pm/elixir/1.12/Integer.html

• Integer.parse('ff', 16)

Ruby

• https://stackoverflow.com/questions/49274/safe-integer-parsing-in-ruby

• Integer('1001')

Note

It depends on what kind of language ysh is, really. For an OOP language, the API could be something like a class instantiation. But for FPs, a function called parseInt seems to be enough. (The elixir thing is a function under a module).

I think overall JS's approach is better if we have this in default namespace, o.w. arguably elixir's naming is better.

[andychu]

FWIW I added a little hack to do this in YSH, using OSH /bash features

https://github.com/oils-for-unix/oils/blob/master/demo/url-search-params.ysh#L53

func strFromTwoHex(two_hex) {
  var result

  printf -v result "\\x$two_hex"
  return (result)
}

OK well I guess this turns 0x1f into a string, not an integer

But printf can probably also do the latter