How to read from the stdin with nim script?

Question

How would i read from the stdin via nimscript?

i've tried:

if readLine(stdin) == "yes":
  exec buildCommand  

i've run the script with

nim c build.nims

i receive

build.nims(50, 13) Error: undeclared identifier: 'stdin'

Crossstaff

Answer 1

I don't think nimscript supports reading from stdin just yet.

You might want to create a feature request for this: https://github.com/nim-lang/Nim/issues

Prager

Answer 2

var f : File;
discard f.open(0, fmRead)

let s = f.readLine()
echo "INPUT " & s

... works -- stdin has file handle 0

Redfaced

gives me foo.nims(2, 10) Error: attempting to call undeclared routine: 'open' i'm on Version 0.13.0 – Crossstaff

hmm ... I'm using that version too. For me it resolves to nim-lang.org/docs/system.html#open,File,FileHandle,FileMode (FileHandle is just cint) – Redfaced

Answer 3

This is now implemented in nimscript in devel: readAllFromStdin().

It will be available in Nim v0.20.0+ (yet to be released as of 2019-05-21).

Totalizator