Readline interface: Difference between revisions

{{trans|D}}

 

 

F hello()

I line == ‘exit’

L.break

 

=={{header|C}}==

A program that does absolutely nothing. Type 'help' for help.

#include <readline/history.h>

#include <string.h>

puts("Yes...?");

}

 

=={{header|C sharp|C#}}==

{{trans|D}}

using System.Collections.Generic;

using System.Runtime.CompilerServices;

}

}

 

=={{header|C++}}==

{{trans|D}}

#include <string>

#include <vector>

 

return 0;

 

=={{header|D}}==

 

import std.stdio;

write(">");

}

{{out}}

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

=={{header|Go}}==

{{trans|D}}

 

import (

}

}

 

{{out}}

=={{header|Java}}==

{{trans|C#}}

import java.io.IOException;

import java.io.InputStreamReader;

}

}

 

=={{header|Julia}}==

Simple program that does nothing (copy of [[#C | C]]).

 

print(prompt)

r = readline(STDIN)

end

 

 

=={{header|Kotlin}}==

 

var range = intArrayOf() // empty initially

println()

}

 

{{out}}

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.

 

 

var history: seq[string]

echo "Unknown command, try again."

else:

 

{{out}}

gp uses readline, but it can also be used directly in PARI:

 

#include <pari/pari.h>

#include <readline/readline.h>

}

return 0;

 

<small>Code thanks to [http://pari.math.u-bordeaux.fr/archives/pari-dev-1002/msg00023.html Bill Allombert]</small>

=={{header|Perl}}==

A Perl shell with command history, line-editing and variable-name completion. Simplified from the example supplied with the CPAN module <code>Term::Readline::Gnu</code>.

use warnings;

use Term::ReadLine;

}

return undef;

 

=={{header|Phix}}==

watch.pike is the solution from [[Simple database#Pike]]. this solution demonstrates how to retrofit an application with a readline interface by inheriting the original and overriding specific functions.

 

 

inherit "watch.pike";

}

}

 

Sample session:

=={{header|Python}}==

Python readline interface is enabled by default in the interpreter REPL, and can be enabled in user code simply by importing the readline module

 

#

except:

break

 

=={{header|Racket}}==

<br>The HELP (or '''?'''), REDO, error checking, and abbreviations took up most of the program.

<br>"User" commands (subroutines) are identified with a leading period ('''.''') to make it easier to understand what's what.

trace off /*suppress echoing of non-zero retCodes*/

signal on syntax; signal on noValue /*handle REXX program errors. */

end /*select*/

return ccc

This REXX program makes use of &nbsp; '''LINESIZE''' &nbsp; REXX program (or BIF) which is used to determine the screen width (or linesize) of the terminal (console).

<br>The &nbsp; '''LINESIZE.REX''' &nbsp; REXX program is included here &nbsp; ──► &nbsp; [[LINESIZE.REX]].<br>

<br>A history of the commands is navigated by the up- and down-keys. All commands are just echoed, except "quit" which exits.

<br>It uses the Ruby 2.3 method Hash#to_proc.

require "abbrev"

 

exit if buf.strip == "quit"

p buf

 

=={{header|Sidef}}==

 

var term = %O<Term::ReadLine>.new('Example')

 

say "You inserted <<#{cmd}>>"

 

=={{header|Wren}}==

{{trans|Go}}

 

class ReadLine {

}

 

 

{{out}}