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Text File  |  1996-10-03  |  4KB  |  147 lines
  1. package Term::Complete;
  2. require 5.000;
  3. require Exporter;
  4.  
  5. @ISA = qw(Exporter);
  6. @EXPORT = qw(Complete);
  7.  
  8. #      @(#)complete.pl,v1.1            (me@anywhere.EBay.Sun.COM) 09/23/91
  9.  
  10. =head1 NAME
  11.  
  12. Term::Complete - Perl word completion module
  13.  
  14. =head1 SYNOPSIS
  15.  
  16.     $input = complete('prompt_string', \@completion_list);
  17.     $input = complete('prompt_string', @completion_list);
  18.  
  19. =head1 DESCRIPTION
  20.  
  21. This routine provides word completion on the list of words in
  22. the array (or array ref).
  23.  
  24. The tty driver is put into raw mode using the system command
  25. C<stty raw -echo> and restored using C<stty -raw echo>.
  26.  
  27. The following command characters are defined:
  28.  
  29. =over 4
  30.  
  31. =item E<lt>tabE<gt>
  32. Attempts word completion.
  33. Cannot be changed.
  34.  
  35. =item ^D
  36.  
  37. Prints completion list.
  38. Defined by I<$Term::Complete::complete>.
  39.  
  40. =item ^U
  41.  
  42. Erases the current input.
  43. Defined by I<$Term::Complete::kill>.
  44.  
  45. =item E<lt>delE<gt>, E<lt>bsE<gt>
  46.  
  47. Erases one character.
  48. Defined by I<$Term::Complete::erase1> and I<$Term::Complete::erase2>.
  49.  
  50. =back
  51.  
  52. =head1 DIAGNOSTICS
  53.  
  54. Bell sounds when word completion fails.
  55.  
  56. =head1 BUGS
  57.  
  58. The completion charater E<lt>tabE<gt> cannot be changed.
  59.  
  60. =head1 AUTHOR
  61.  
  62. Wayne Thompson
  63.  
  64. =cut
  65.  
  66. CONFIG: {
  67.     $complete = "\004";
  68.     $kill     = "\025";
  69.     $erase1 =   "\177";
  70.     $erase2 =   "\010";
  71. }
  72.  
  73. sub Complete {
  74.     $prompt = shift;
  75.     if (ref $_[0] || $_[0] =~ /^\*/) {
  76.     @cmp_lst = sort @{$_[0]};
  77.     }
  78.     else {
  79.     @cmp_lst = sort(@_);
  80.     }
  81.  
  82.     system('stty raw -echo');
  83.     LOOP: {
  84.         print($prompt, $return);
  85.         while (($_ = getc(STDIN)) ne "\r") {
  86.             CASE: {
  87.                 # (TAB) attempt completion
  88.                 $_ eq "\t" && do {
  89.                     @match = grep(/^$return/, @cmp_lst);
  90.                     $l = length($test = shift(@match));
  91.                     unless ($#match < 0) {
  92.                         foreach $cmp (@match) {
  93.                             until (substr($cmp, 0, $l) eq substr($test, 0, $l)) {
  94.                                 $l--;
  95.                             }
  96.                         }
  97.                         print("\a");
  98.                     }
  99.                     print($test = substr($test, $r, $l - $r));
  100.                     $r = length($return .= $test);
  101.                     last CASE;
  102.                 };
  103.  
  104.                 # (^D) completion list
  105.                 $_ eq $complete && do {
  106.                     print(join("\r\n", '', grep(/^$return/, @cmp_lst)), "\r\n");
  107.                     redo LOOP;
  108.                 };
  109.  
  110.                 # (^U) kill
  111.                 $_ eq $kill && do {
  112.                     if ($r) {
  113.                         undef($r, $return);
  114.                         print("\r\n");
  115.                         redo LOOP;
  116.                     }
  117.                     last CASE;
  118.                 };
  119.  
  120.                 # (DEL) || (BS) erase
  121.                 ($_ eq $erase1 || $_ eq $erase2) && do {
  122.                     if($r) {
  123.                         print("\b \b");
  124.                         chop($return);
  125.                         $r--;
  126.                     }
  127.                     last CASE;
  128.                 };
  129.  
  130.                 # printable char
  131.                 ord >= 32 && do {
  132.                     $return .= $_;
  133.                     $r++;
  134.                     print;
  135.                     last CASE;
  136.                 };
  137.             }
  138.         }
  139.     }
  140.     system('stty -raw echo');
  141.     print("\n");
  142.     $return;
  143. }
  144.  
  145. 1;
  146.  
  147.