/usr/share/perl5/complete.pl is in libperl4-corelibs-perl 0.003-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This library is no longer being maintained, and is included for backward
# compatibility with Perl 4 programs which may require it.
#
# In particular, this should not be used as an example of modern Perl
# programming techniques.
#
# Suggested alternative: Term::Complete
#
;# @(#)complete.pl,v1.1 (me@anywhere.EBay.Sun.COM) 09/23/91
;#
;# Author: Wayne Thompson
;#
;# Description:
;# This routine provides word completion.
;# (TAB) attempts word completion.
;# (^D) prints completion list.
;# (These may be changed by setting $Complete'complete, etc.)
;#
;# Diagnostics:
;# Bell when word completion fails.
;#
;# Dependencies:
;# The tty driver is put into raw mode.
;#
;# Bugs:
;#
;# Usage:
;# $input = &Complete('prompt_string', *completion_list);
;# or
;# $input = &Complete('prompt_string', @completion_list);
;#
CONFIG: {
package Complete;
$complete = "\004";
$kill = "\025";
$erase1 = "\177";
$erase2 = "\010";
}
sub Complete {
package Complete;
local($prompt, @cmp_list, $return, @match, $l, $test, $cmp, $r);
if ($_[1] =~ /^StB\0/) {
($prompt, *_) = @_;
}
else {
$prompt = shift(@_);
}
@cmp_lst = sort(@_);
system('stty raw -echo');
LOOP: {
print($prompt, $return);
while (($_ = getc(STDIN)) ne "\r") {
CASE: {
# (TAB) attempt completion
$_ eq "\t" && do {
@match = grep(/^$return/, @cmp_lst);
$l = length($test = shift(@match));
unless ($#match < 0) {
foreach $cmp (@match) {
until (substr($cmp, 0, $l) eq substr($test, 0, $l)) {
$l--;
}
}
print("\a");
}
print($test = substr($test, $r, $l - $r));
$r = length($return .= $test);
last CASE;
};
# (^D) completion list
$_ eq $complete && do {
print(join("\r\n", '', grep(/^$return/, @cmp_lst)), "\r\n");
redo LOOP;
};
# (^U) kill
$_ eq $kill && do {
if ($r) {
undef $r;
undef $return;
print("\r\n");
redo LOOP;
}
last CASE;
};
# (DEL) || (BS) erase
($_ eq $erase1 || $_ eq $erase2) && do {
if($r) {
print("\b \b");
chop($return);
$r--;
}
last CASE;
};
# printable char
ord >= 32 && do {
$return .= $_;
$r++;
print;
last CASE;
};
}
}
}
system('stty -raw echo');
print("\n");
$return;
}
1;
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