Readline interface: Difference between revisions

=={{header|Nim}}==

{{trans|Go}}

Nim provides a module <code>rdstdin</code> to read form standard input file. This modules provides navigation in history of previous commands using the up and down keys.

<lang Nim>import rdstdin, strutils, tables

var history: seq[string]

proc hello =

echo "Hello World!"

history.add "hello"

proc hist =

if history.len == 0:

echo "no history"

else:

for cmd in history:

echo " -", cmd

history.add "hist"

proc help =

echo "Available commands:"

echo " hello"

echo " hist"

echo " exit"

echo " help"

history.add "help"

const Vfs = {"help": help, "hist": hist, "hello": hello}.toTable

echo "Enter a command, type help for a listing."

while true:

let line = try:

readLineFromStdin(">").strip()

except IOError:

echo "EOF encountered. Bye."

break

if line == "exit": break

if line notin Vfs:

echo "Unknown command, try again."

else:

Vfs[line]()</lang>

{{out}}

Sample session.

<pre>Enter a command, type help for a listing.

>help

Available commands:

hello

hist

exit

help

>hello

Hello World!

>hist

-help

-hello

>quit

Unknown command, try again.

>exit</pre>