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Readline interface: Difference between revisions
→{{header|Nim}}
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quit
</pre>
=={{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>
=={{header|PARI/GP}}==
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