Provided by: libterm-prompt-perl_1.04-2_all 
NAME
Term::Prompt - Perl extension for prompting a user for information
SYNOPSIS
use Term::Prompt;
$value = prompt(...);
use Term::Prompt qw(termwrap);
print termwrap(...);
$Term::Prompt::MULTILINE_INDENT = '';
PREREQUISITES
You must have Text::Wrap and Term::ReadKey available on your system.
DESCRIPTION
This main function of this module is to accept interactive input. You specify the type of
inputs allowed, a prompt, help text and defaults and it will deal with the user interface,
(and the user!), by displaying the prompt, showing the default, and checking to be sure
that the response is one of the legal choices. Additional 'types' that could be added
would be a phone type, a social security type, a generic numeric pattern type...
FUNCTIONS
prompt
This is the main function of the module. Its first argument determines its usage and is
one of the following single characters:
x: do not care
a: alpha-only
n: numeric-only
i: ignore case
c: case sensitive
r: ranged by the low and high values
f: floating-point
y: yes/no
e: regular expression
s: sub (actually, a code ref, but 'c' was taken)
p: password (keystrokes not echoed)
m: menu
x: do not care
$result = prompt('x', 'text prompt', 'help prompt', 'default' );
$result is whatever the user types.
a: alpha-only
$result = prompt('a', 'text prompt', 'help prompt', 'default' );
$result is a single 'word' consisting of [A-Za-z] only. The response is rejected until
it conforms.
n: numeric-only
$result = prompt('n', 'text prompt', 'help prompt', 'default' );
The result will be a positive integer or 0.
$result = prompt('-n', 'text prompt', 'help prompt', 'default' );
The result will be a negative integer or 0.
$result = prompt('+-n', 'text prompt', 'help prompt', 'default' );
The result will be a any integer or 0.
i: ignore case
$result = prompt('i', 'text prompt', 'help prompt', 'default',
'legal_options-ignore-case-list');
c: case sensitive
$result = prompt('c', 'text prompt', 'help prompt', 'default',
'legal_options-case-sensitive-list');
r: ranged by the low and high values
$result = prompt('r', 'text prompt', 'help prompt', 'default',
'low', 'high');
f: floating-point
$result = prompt('f', 'text prompt', 'help prompt', 'default');
The result will be a floating-point number.
y: yes/no
$result = prompt('y', 'text prompt', 'help prompt', 'default')
The result will be 1 for y, 0 for n. A default not starting with y, Y, n or N will be
treated as y for positive, n for negative.
e: regular expression
$result = prompt('e', 'text prompt', 'help prompt', 'default',
'regular expression');
The regular expression has and implicit ^ and $ surrounding it; just put in .* before
or after if you need to free it up before or after.
s: sub
$result = prompt('s', 'text prompt', 'help prompt', 'default',
sub { warn 'Your input was ' . shift; 1 });
$result = prompt('s', 'text prompt', 'help prompt', 'default',
\&my_custom_validation_handler);
User reply is passed to given code reference as first and only argument. If code
returns true, input is accepted.
p: password
$result = prompt('p', 'text prompt', 'help prompt', 'default' );
$result is whatever the user types, but the characters are not echoed to the screen.
m: menu
@results = prompt(
'm',
{
prompt => 'text prompt',
title => 'My Silly Menu',
items => [ qw (foo bar baz biff spork boof akak) ],
order => 'across',
rows => 1,
cols => 1,
display_base => 1,
return_base => 0,
accept_multiple_selections => 0,
accept_empty_selection => 0,
ignore_whitespace => 0,
separator => '[^0-9]+'
},
'help prompt',
'default');
This will create a menu with numbered items to select. You replace the normal prompt
argument with a hash reference containing this information:
prompt
The prompt string.
title
Text printed above the menu.
items
An array reference to the list of text items to display. They will be numbered
ascending in the order presented.
order
If set to 'across', the item numbers run across the menu:
1) foo 2) bar 3) baz
4) biff 5) spork 6) boof
7) akak
If set to 'down', the item numbers run down the menu:
1) foo 4) biff 7) akak
2) bar 5) spork
3) baz 6) boof
'down' is the default.
rows,cols
Forces the number of rows and columns. Otherwise, the number of rows and columns
is determined from the number of items and the maximum length of an item with its
number.
Usually, you would set rows = 1 or cols = 1 to force a non-wrapped layout. Setting
both in tandem is untested. Cavet programmer.
display_base,return_base
Internally, the items are indexed the 'Perl' way, from 0 to scalar -1. The
display_base is the number added to the index on the menu display. The return_base
is the number added to the index before the reply is returned to the programmer.
The defaults are 1 and 0, respectively.
accept_multiple_selections
When set to logical true (1 will suffice), more than one menu item may be
selected. The return from prompt() will be an array or array ref, depending on how
it is called.
The default is 0. The return value is a single scalar containing the selection.
accept_empty_selection
When set to logical true (1 will suffice), if no items are selected, the menu will
not be repeated and the 'empty' selection will be returned. The value of an
'empty' selection is an empty array or a reference to same, if
accept_multiple_selections is in effect, or undef if not.
separator
A regular expression that defines what characters are allowed between multiple
responses. The default is to allow all non-numeric characters to be separators.
That can cause problems when a user mistakenly enters the lead letter of the menu
item instead of the item number. You are better off replacing the default with
something more reasonable, such as:
[,] ## Commas
[,/] ## Commas or slashes
[,/\s] ## Commas or slashes or whitespace
ignore_whitespace
When set, allows spaces between menu responses to be ignored, so that
1, 5, 6
is collapsed to
1,5,6
before parsing. NOTE: Do not set this option if you are including whitespace as a
legal separator.
ignore_empties
When set, consecutive separators will not result in an empty entry. For example,
without setting this option:
1,,8,9
will result in a return of
(1,'',8,9)
When set, the return will be:
(1,8,9)
which is probably what you want.
Other Functions and Variables
termwrap
Part of Term::Prompt is the optionally exported function termwrap, which is used to
wrap lines to the width of the currently selected filehandle (or to STDOUT or STDERR
if the width of the current filehandle cannot be determined). It uses the
GetTerminalSize function from Term::ReadKey then Text::Wrap.
MULTILINE_INDENT
This package variable holds the string to be used to indent lines of a multiline
prompt, after the first line. The default is "\t", which is how the module worked
before the variable was exposed. If you do not want ANY indentation:
$Term::Prompt::MULTILINE_INDENT = '';
Text and Help Prompts
What, you might ask, is the difference between a 'text prompt' and a 'help prompt'? Think
about the case where the 'legal_options' look something like: '1-1000'. Now consider what
happens when you tell someone that '0' is not between 1-1000 and that the possible choices
are: :) 1 2 3 4 5 ..... This is what the 'help prompt' is for.
It will work off of unique parts of 'legal_options'.
Changed by Allen - if you capitalize the type of prompt, it will be treated as a true
'help prompt'; that is, it will be printed ONLY if the menu has to be redisplayed due to
and entry error. Otherwise, it will be treated as a list of options and displayed only the
first time the menu is displayed.
Capitalizing the type of prompt will also mean that a return may be accepted as a
response, even if there is no default; whether it actually is will depend on the type of
prompt. Menus, for example, do not do this.
AUTHOR
Original Author: Mark Henderson (henderson@mcs.anl.gov or systems@mcs.anl.gov). Derived
from im_prompt2.pl, from anlpasswd (see ftp://info.mcs.anl.gov/pub/systems/), with
permission.
Contributors:
E. Allen Smith (easmith@beatrice.rutgers.edu): Revisions for Perl 5, additions of
alternative help text presentation, floating point type, regular expression type, yes/no
type, line wrapping and regular expression functionality added by E. Allen Smith.
Matthew O. Persico (persicom@cpan.org): Addition of menu functionality and
$Term::Prompt::MULTILINE_INDENT.
Tuomas Jormola (tjormola@cc.hut.fi): Addition of code refs.
Current maintainer: Matthew O. Persico (persicom@cpan.org)
SEE ALSO
perl, Term::ReadKey, and Text::Wrap.
COPYRIGHT AND LICENSE
Copyright (C) 2004 by Matthew O. Persico
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself, either Perl version 5.6.1 or, at your option, any later version of
Perl 5 you may have available.