Re: How to install Perl with readline support?

[David Christensen <dpchrist@holgerdanske.com>]

On 03/12/2016 08:54 AM, Kynn Jones wrote:
> I have been searching for the answer to the subject line's question
> for the last two hours.

On my Wheezy 7.9 box, Term::ReadLine is already installed.


RTFM Term::ReadLine, pasting the SYNOPSIS into a script, and running it:

    $ cat readline.pl
    use Term::ReadLine;
    my $term = Term::ReadLine->new('Simple Perl calc');
    my $prompt = "Enter your arithmetic expression: ";
    my $OUT = $term->OUT || \*STDOUT;
    while ( defined ($_ = $term->readline($prompt)) ) {
        my $res = eval($_);
        warn $@ if $@;
        print $OUT $res, "\n" unless $@;
        $term->addhistory($_) if /\S/;
    }

    $ perl readline.pl
    Enter your arithmetic expression: 1+1
    2
    Enter your arithmetic expression: ^[[A^C


History did not work on the second prompt.


> I have [installed]
>
>      libreadline-dev
>      libterm-readline-gnu-perl
>      libterm-readline-perl-perl

RTFM Term::ReadLine indicates that a back end is needed. Either of the 
latter two you installed should be sufficient.


If I install:

    libterm-readline-perl-perl


And run the example again:

    $ perl readline.pl

    Enter your arithmetic expression: 1+1
    2

    Enter your arithmetic expression: 1+1
    2

    Enter your arithmetic expression:


History works, but there are extra blank lines between prompts and my 
terminal can get stuck in bold mode depending on how I exit (?).


David