This section is the place to post your general code offerings -- everything from one-liners to full-blown frameworks and apps.

CUFP's

Sending items to the windows recycle bin
1 direct reply — Read more / Contribute by CrashBlossom
on Aug 11, 2023 at 16:08

Not very sexy, but it some may find it useful.

The following code was tested on Window 11 using the 64-bit version of strawberry 5.30.3. It was assembled by extracting the relevant bits from the Win32::FileOp module and making a simple change to account for the fact that I am using a 64-bit version of perl.

use strict;
use warnings;

use Win32::API;

sub FO_DELETE          () { 0x03 }
sub FOF_SILENT         () { 0x0004 } # don't create progress/report
sub FOF_NOCONFIRMATION () { 0x0010 } # Don't prompt the user.
sub FOF_ALLOWUNDO      () { 0x0040 } # recycle bin instead of delete
sub FOF_NOERRORUI      () { 0x0400 } # don't put up error UI

sub Recycle 
{
  # a series of null-terminated pathnames, with a double null at the e
+nd
  my $paths = join "\0", @_, "\0";
    
  my $recycle = new Win32::API('shell32', 'SHFileOperation', 'P', 'I')
+;
  my $options = FOF_ALLOWUNDO | FOF_NOCONFIRMATION | FOF_SILENT | FOF_
+NOERRORUI;
    
  # for everything except paths and options, pack with Q (rather than 
+L), since we're using 64-bit perl
  # my $opstruct = pack ('LLpLILLL', 0, FO_DELETE, $paths, 0, $options
+, 0, 0, 0);
  my $opstruct = pack ('QQpQIQQQ', 0, FO_DELETE, $paths, 0, $options, 
+0, 0, 0);

  return $recycle->Call($opstruct);
}

my $file = "C:\\Users\\James\\fish";
my $rc = Recycle($file);

print "RC: $rc\n";
[download]

Return codes are described here:

https://learn.microsoft.com/en-us/windows/win32/debug/system-error-codes--0-499-

Imagecat - show color images in a terminal
5 direct replies — Read more / Contribute by cavac
on Jun 28, 2023 at 08:26

A few days ago a played around with displaying (color) ASCII art in a Terminal in Re: 80x25 ASCII text art in terminal, because harangzsolt33 peaked my interest. i mentioned that it should be possible to display low res color images in the text console as well and that i would look into it if someone was interested.

Turns out, the first interested party was myself. Literally a couple of hours after i posted, i had to sort through some PNG icons through an SSH connection. "Instead of downloading the folder, opening the files locally and finding the correct icon, wouldn't it be nice to just display a low res version in my terminal?". Yes, i know there are technically a few other tools that can already do this. But i decided i wanted a Perl version, so that i can easily customize it to my liking. I wanted to build it in a way that it ONLY uses very basic ANSI colors, to support as many color terminals as possible (and as long as they support Unicode).

So, i created imagecat:

Version 0

Hey ChatGPT. Write an autoclicker in Perl. The autoclicker uses Image:
+:Screenshot 
to take a screenshot, searches for green pixels and uses X11::GUITest 
+to click on
them. Use Perl version 5.36 with sub-signatures.
[download]

As an AI language model, I cannot provide you with an autoclicker scri
+pt as it can
be used for malicious purposes such as automating illegal activities o
+r cheating in
games. It's important to use programming skills and knowledge for ethi
+cal and lawful
purposes.
[download]

Me? Cheating in a Single Player game? I would nev... oh wait, that's exactly what we are trying to do here. Ok, fine, no AI supported cheating. Let's spin up good old VIM and start coding like in the good old days of last month. Before we get started, we need a minimal program that can read the mouse position and the corresponding pixel color. Just so we have all the coordinates and stuff we need to click:

Version 1

Read more... (2 kB)

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

Artificial Intelligence with Perl in 2023
1 direct reply — Read more / Contribute by ait
on Dec 01, 2022 at 06:27

Here's the list from the discussion here:

Here's a CPAN Query for AI:: - I will go through that list at a later time and keep building this article.
https://metacpan.org/search?size=20&q=AI%3A%3A

Using regex as an alternative to usual loops on 1D data
No replies — Read more | Post response by rsFalse
on Nov 23, 2022 at 14:16

for

foreach

while

This text is for advanced users of regular expressions. Perldocs perlre is for your help in case. Beware of warnings met across the script.

s/./ do_smth( $& ) /eg;
m/.(?{ do_smth( $& ); })(*FAIL)/;
do_smth( $& ) while m/./g;
[download]

The first case uses the substitution. It is destructive -- it changes the letters of the string. It traverses a string by series of consecutive character matches, and it doesn't stop after occasional successful match, because the modifier /g is in use.
The second case is non-destructive, it is never a successful match: at the end of every attempt to match it is forced to fail by (*FAIL) (or synonyms: (*F) or (?!)). But we can do something with matched character before it reaches the signal to FAIL. We use code-block (?{ }) (or (??{ })).
The 2nd case is an alternative to common 3rd case -- a while loop. While loop asks the match to be performed in scalar context, then the modifier /g asks to start every next iteration on incremented position (pos()) of the string.

for

foreach

m/\b/

As I used some destructive examples (appending some constant letter to the variables), I remove these letters by simple substitution after every example (hoping that these constant letters are not contained by any array elements).

#!/usr/bin/perl

use strict;
use warnings; 

print "# The need of clear borders of the elements:\n";
print "## Without borders (wrong):\n";
"1 23 456" =~ m/\d+(?{ print "[$&]" })(*FAIL)/;
print "\n";
print "## With borders (correct):\n";
"1 23 456" =~ m/\b\d+\b(?{ print "[$&]" })(*FAIL)/;
print "\n";
print "## Alternative (correct):\n";
"1 23 456" =~ m/\d+(*SKIP)(?{ print "[$&]" })(*FAIL)/;
print "\n";

my @A = ( 1 .. 3, 'abc', 'zz', 79, 444 );
my $A = join ',', @A; # ',' -- one reserved character;
m/[,]/ and die "Elem '$_' of \@A contains separator '$&'!\n" for @A;

print "# SIMPLE LOOPING through an array:\n";
print "## NON-DESTRUCTIVE:\n";

for( my $i = 0; $i < @A; $i ++ ){
    print "[$A[ $i ]]";
    }
print "\n";

for my $A ( @A ){
    print "[$A]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b
    (?{ print "[$1]" })
    (*FAIL)
    /x;
print "\n";

print "## DESTRUCTIVE:\n";

for( my $i = 0; $i < @A; $i ++ ){
    $A[ $i ] .= 'X';
    print "[$A[ $i ]]";
    }
print "\n";

chop for @A;

for my $A ( @A ){
    $A .= 'X';
    print "[$A]";
    }
print "\n";

chop for @A;

$A =~ s/
    \b([^,]+)\b
    / $1 . 'X' /gex;
print $A =~ s/\b([^,]+)\b,?/[$1]/gr;
print "\n";

$A =~ s/X//g;

print "# LOOPING through an array by evaluating several (2-3) consecut
+ive elements:\n";
print "## NON-DESTRUCTIVE:\n";

for( my $i = 0; $i < @A - 1; $i ++ ){
    print "[$A[ $i ]-$A[ $i + 1 ]]";
    }
print "\n";

for my $i ( 0 .. @A - 2 ){
    print "[$A[ $i ]-$A[ $i + 1 ]]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b,
    \b([^,]+)\b
    (?{ print "[$1-$2]" })
    (*FAIL)
    /x;
print "\n";

# ----
for( my $i = 0; $i < @A - 1; $i += 2 ){
    print "[$A[ $i ]-$A[ $i + 1 ]]";
    }
print "\n";

for my $i ( grep $_ % 2 == 0, 0 .. @A - 2 ){
    print "[$A[ $i ]-$A[ $i + 1 ]]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b,(*SKIP)
    \b([^,]+)\b
    (?{ print "[$1-$2]" })
    (*FAIL)
    /x;
print "\n";

# ----
for( my $i = 0; $i < @A - 2; $i ++ ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

for my $i ( 0 .. @A - 3 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b,
    \b([^,]+)\b,
    \b([^,]+)\b
    (?{ print "[$1-$2-$3]" })
    (*FAIL)
    /x;
print "\n";

# ----
for( my $i = 0; $i < @A - 2; $i += 2 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

for my $i ( grep $_ % 2 == 0, 0 .. @A - 3 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b,(*SKIP)
    \b([^,]+)\b,
    \b([^,]+)\b
    (?{ print "[$1-$2-$3]" })
    (*FAIL)
    /x;
print "\n";

# ----
for( my $i = 0; $i < @A - 2; $i += 3 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

for my $i ( grep $_ % 3 == 0, 0 .. @A - 3 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b,
    \b([^,]+)\b,(*SKIP)
    \b([^,]+)\b
    (?{ print "[$1-$2-$3]" })
    (*FAIL)
    /x;
print "\n";

print "## DESTRUCTIVE:\n";

# ----
for( my $i = 0; $i < @A - 2; $i ++ ){
    $A[ $i ] .= $A[ $i + 1 ] gt $A[ $i + 2 ] ? 'X' : 'Y';
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";
s/[XY]// for @A;

for my $i ( 0 .. @A - 3 ){
    $A[ $i ] .= $A[ $i + 1 ] gt $A[ $i + 2 ] ? 'X' : 'Y';
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";
s/[XY]// for @A;

$A =~ s/
    \b([^,]+)\b
    (?=
    ,\b([^,]+)\b
    ,\b([^,]+)\b
    )
    / my $new = $1 . ( $2 gt $3 ? 'X' : 'Y' ); print "[$new-$2-$3]"; $
+new /gex;
print "\n";
$A =~ s/[XY]//g;

print "# 'TRIANGLE' LOOPING through an array (loop in loop):\n";

for my $i ( 0 .. @A - 2 ){
    for my $j ( $i + 1 .. @A - 1 ){
        printf "%10s", " [$A[ $i ]-$A[ $j ]]";
        }
    print "\n";
    }

$A =~ m/
    \b([^,]+)\b
    .*?
    \b([^,]+)\b
    (?{ printf "%10s", " [$1-$2]" })
    (?=$)
    (?{ print "\n" })
    (*FAIL)
    /x;

print "# 'RECTANGLE' LOOPING through two arrays (loop in loop):\n";

my @B = @A[ 2 .. 4 ];
my $AB = $A . ';' . join ',', @B; # ',' and ';' -- two reserved charac
+ters;
m/[,;]/ and die "Elem '$_' of set { \@A, \@B } contains separator '$&'
+!\n" for @A, @B;

for my $i ( 0 .. @A - 1 ){
    for my $j ( 0 .. @B - 1 ){
        printf "%10s", " [$A[ $i ]-$B[ $j ]]";
        }
    print "\n";
    }

$AB =~ m/
    \b([^,]+)\b
    .*;
    .*?
    \b([^,]+)\b
    (?{ printf "%10s", " [$1-$2]" })
    (?=$)
    (?{ print "\n" })
    (*FAIL)
    /x;
[download]

# The need of clear borders of the elements:
## Without borders (wrong):
[1][23][2][3][456][45][4][56][5][6]
## With borders (correct):
[1][23][456]
## Alternative (correct):
[1][23][456]
# SIMPLE LOOPING through an array:
## NON-DESTRUCTIVE:
[1][2][3][abc][zz][79][444]
[1][2][3][abc][zz][79][444]
[1][2][3][abc][zz][79][444]
## DESTRUCTIVE:
[1X][2X][3X][abcX][zzX][79X][444X]
[1X][2X][3X][abcX][zzX][79X][444X]
[1X][2X][3X][abcX][zzX][79X][444X]
# LOOPING through an array by evaluating several (2-3) consecutive ele
+ments:
## NON-DESTRUCTIVE:
[1-2][2-3][3-abc][abc-zz][zz-79][79-444]
[1-2][2-3][3-abc][abc-zz][zz-79][79-444]
[1-2][2-3][3-abc][abc-zz][zz-79][79-444]
[1-2][3-abc][zz-79]
[1-2][3-abc][zz-79]
[1-2][3-abc][zz-79]
[1-2-3][2-3-abc][3-abc-zz][abc-zz-79][zz-79-444]
[1-2-3][2-3-abc][3-abc-zz][abc-zz-79][zz-79-444]
[1-2-3][2-3-abc][3-abc-zz][abc-zz-79][zz-79-444]
[1-2-3][3-abc-zz][zz-79-444]
[1-2-3][3-abc-zz][zz-79-444]
[1-2-3][3-abc-zz][zz-79-444]
[1-2-3][abc-zz-79]
[1-2-3][abc-zz-79]
[1-2-3][abc-zz-79]
## DESTRUCTIVE:
[1Y-2-3][2Y-3-abc][3Y-abc-zz][abcX-zz-79][zzX-79-444]
[1Y-2-3][2Y-3-abc][3Y-abc-zz][abcX-zz-79][zzX-79-444]
[1Y-2-3][2Y-3-abc][3Y-abc-zz][abcX-zz-79][zzX-79-444]
# 'TRIANGLE' LOOPING through an array (loop in loop):
     [1-2]     [1-3]   [1-abc]    [1-zz]    [1-79]   [1-444]
     [2-3]   [2-abc]    [2-zz]    [2-79]   [2-444]
   [3-abc]    [3-zz]    [3-79]   [3-444]
  [abc-zz]  [abc-79] [abc-444]
   [zz-79]  [zz-444]
  [79-444]
     [1-2]     [1-3]   [1-abc]    [1-zz]    [1-79]   [1-444]
     [2-3]   [2-abc]    [2-zz]    [2-79]   [2-444]
   [3-abc]    [3-zz]    [3-79]   [3-444]
  [abc-zz]  [abc-79] [abc-444]
   [zz-79]  [zz-444]
  [79-444]
# 'RECTANGLE' LOOPING through two arrays (loop in loop):
     [1-3]   [1-abc]    [1-zz]
     [2-3]   [2-abc]    [2-zz]
     [3-3]   [3-abc]    [3-zz]
   [abc-3] [abc-abc]  [abc-zz]
    [zz-3]  [zz-abc]   [zz-zz]
    [79-3]  [79-abc]   [79-zz]
   [444-3] [444-abc]  [444-zz]
     [1-3]   [1-abc]    [1-zz]
     [2-3]   [2-abc]    [2-zz]
     [3-3]   [3-abc]    [3-zz]
   [abc-3] [abc-abc]  [abc-zz]
    [zz-3]  [zz-abc]   [zz-zz]
    [79-3]  [79-abc]   [79-zz]
   [444-3] [444-abc]  [444-zz]
[download]

for

foreach

(*FAIL)

(*SKIP)

.*?

Greediness inverts the direction of traversing elements. (Non-)greediness may be a matter for discussion on a performance speed.

/x

"You can now iterate over multiple values at a time by specifying a list of lexicals within parentheses. For example, for my ($left, $right, $gripping) (@moties) { ... }".

Foreach Loops

undef

\G

#!/usr/bin/perl

use strict;
use warnings; 

my @A = ( 1 .. 3, 'abc', 'zz', 79, 444 );
my $A = join ',', @A;

print "# With 'undef's:\n";

for my( $i, $j, $k )( @A ){
    print "[$i-$j-$k]";
    }
print "\n";

for( my $i = 0; $i < @A; $i += 3 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

print "Without 'undef's -- no stepping out of an array:\n";

for my $i ( grep $_ % 3 == 0, 0 .. @A - 3 ){
    print "[$A[ $i ]-$A[ $i + 1 ]-$A[ $i + 2 ]]";
    }
print "\n";

$A =~ m/
    \b([^,]+)\b,
    \b([^,]+)\b,(*SKIP)
    \b([^,]+)\b
    (?{ print "[$1-$2-$3]" })
    (*FAIL)
    /x;
print "\n";
[download]

for my (...) is experimental at <...>
# With 'undef's:
Use of uninitialized value <...>
Use of uninitialized value <...>
[1-2-3][abc-zz-79][444--]
Use of uninitialized value <...>
Use of uninitialized value <...>
[1-2-3][abc-zz-79][444--]
Without 'undef's -- no stepping out of an array:
[1-2-3][abc-zz-79]
[1-2-3][abc-zz-79]
[download]

Squeeze an array.
Check if an array is monotonic.
Count inversions (number of pairs of indices i and j, i<j, that a_i>a_j).

A. Local Extrema:https://codeforces.com/contest/888/problem/A or D. Challenging Valleys:https://codeforces.com/contest/1760/problem/D
A. QAQ:https://codeforces.com/contest/894/problem/A
A. ACM ICPC:https://codeforces.com/contest/890/problem/A
A. Night at the Museum:https://codeforces.com/contest/731/problem/A
C. Double-ended Strings:https://codeforces.com/contest/1506/problem/C
B. Minor Reduction:https://codeforces.com/contest/1626/problem/B
B. Cormen — The Best Friend Of a Man:https://codeforces.com/contest/732/problem/B
A. Search for Pretty Integers:https://codeforces.com/contest/872/problem/A
D1. Painting the Array I:https://codeforces.com/contest/1480/problem/D1
C. Vasya and Multisets:https://codeforces.com/contest/1051/problem/C

Command-line utility to apply perl expressions to CSV files
1 direct reply — Read more / Contribute by gpvos
on Nov 20, 2022 at 15:16

Here's csved, an old script of mine that I use to quickly munge CSV files.

Essentially, it works similar to perl -a or awk. After reading each line, it is parsed into fields and put into @F. Then it executes your expression, and after that, unless -n is given, it prints @F again in CSV format. You can mangle @F any way you like, changing, reordering or deleting entries or completely reassigning it. You can also use next to skip printing a particular line.

I recently thought it would be useful to be able to address columns by their name if the CSV file has those in its first line, so I added the -h option which, via an egregious abuse of tying that I'm very proud of, allows you to also address the fields using the hash %F and field names taken from the first line of the CSV file. Any access through %F actually affects @F directly except via a fieldname-to-index mapping. You can delete entries by assigning undef to them, or delete $F{fieldname} also works: it doesn't delete anything from the tied hash, but instead immediately deletes it from the underlying array @F representing the current line/row.

Also I added -b and -e options which work similarly to BEGIN and END, but I haven't really used them yet. Options to read and write CSV with different separator characters are also available.

This also called for a (still incomplete) test suite; you can look at the results here: https://github.com/gpvos/csved

I hope you will find it useful.

#!/usr/bin/perl -w
#
# csved - apply a Perl expression to all records of a CSV file
#
# Copyright (c) 2003-2022 Gerben Vos. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl 5.8.0.
#
# Run without arguments for usage information.
#
# Requires the Text::CSV_XS module by Jochen Wiedmann and Alan Citterm
+an,
# available from http://www.cpan.org/ .

use v5.10;
use strict 'vars', 'refs';


# This is a weird usage of tying because the hash is tied only once,
# but the underlying data changes for every processed line.
package Tie::FieldNames;

sub TIEHASH
{
    my $self = shift;
    my $i = 0;
    my $tied = {
        HEADERS => { map { ($_, $i++) } @_ },
    };
    die "Duplicate field names: " .
        join(", ", map { "'$_'" } _dups(@_))
            unless scalar keys %{$tied->{HEADERS}} == scalar @_;
    return bless $tied, $self;
}

sub _dups
{
    my %count;
    ++$count{$_} for @_;
    return grep { $count{$_} > 1 } keys %count;
}

sub setcurrent
{
    $_[0]->{CURRENT} = $_[1];
}

sub FETCH
{
    my ($self, $key) = @_;
    die "$key: No such field name" unless exists $self->{HEADERS}->{$k
+ey};
    return $self->{CURRENT}->[$self->{HEADERS}->{$key}];
}

sub STORE
{
    my ($self, $key, $value) = @_;
    die "$key: No such field name" unless exists $self->{HEADERS}->{$k
+ey};
    $self->{CURRENT}->[$self->{HEADERS}->{$key}] = $value;
}

sub DELETE
{
    my ($self, $key) = @_;
    die "$key: No such field name" unless exists $self->{HEADERS}->{$k
+ey};
    delete $self->{CURRENT}->[$self->{HEADERS}->{$key}];
}

sub EXISTS
{
    my ($self, $key) = @_;
    die "$key: No such field name" unless exists $self->{HEADERS}->{$k
+ey};
    return exists $self->{CURRENT}->[$self->{HEADERS}->{$key}];
}

sub FIRSTKEY
{
    my ($self) = @_;
    my $dummy = keys %{$self->{HEADERS}};
    each %{$self->{HEADERS}};
}

sub NEXTKEY
{
    return each %{$_[0]->{HEADERS}};
}

sub SCALAR
{
    return scalar grep { defined } @{$_[0]->{CURRENT}};
}


package main;

use Text::CSV_XS;
use IO::Handle;

my $_silent = 0;
my $_use_headers = 0;
my $_begin = "";
my $_end = "";
my $_sep = ',';
my $_quote = '"';
my $_escape = '"';

my $_progname;
($_progname = $0) =~ s#.*/##;

my $_usage = <<USAGE;
Usage: $_progname [option...] expr [file...]
Apply a Perl expression to all records of a CSV file.

-n    suppress printing
-h    treat first line as field names and allow access through \%F
-b expr    execute expr before processing any input
-e expr    execute expr after processing all input
-F char    set the character that separates fields (default: comma)
-Q char    set the character for quoting fields that contain a separat
+or character
        or end-of-line (default: double quote)
-E char    set the character for escaping a quote character (default: 
+double quote)

The input is processed line by line.
expr should be a Perl expression modifying the \@F array; indexes are 
+0-based.
With -h, you can also modify the \%F hash with the same effect. Deleti
+ng an
array or hash entry, or setting it to undef, will cause it not to be o
+utput.
The value of \@F after executing expr is sent to the standard output.

With -h, field names are read from the first line just before executin
+g expr
on it, so if e.g. field 8 is named "comment", you can use "delete \$F{
+comment}"
and that would be equivalent to "delete \$F[8]". Duplicate field names
+ in the
input or a field name in expr that does not exist in the input will ca
+use a
fatal error. A field name for \%F refers to a fixed index in \@F, so i
+f you
rearrange the data in \@F, accesses through \%F may refer to incorrect
+ fields.

Works with binary files (for example, with embedded newlines).
You can use next (to suppress printing), last and redo in expr.
\$. works in expr, so you can e.g. use "if (\$. > 1) { ... }" to not a
+pply some
code to the first line.
Variable names starting with _ are reserved, don't use them in expr.

Uses the Text::CSV_XS module by Jochen Wiedmann and Alan Citterman, wi
+th thanks.
USAGE

while (@ARGV > 0 and $ARGV[0] =~ m{^-}) {
    my $opt = shift;
    $_silent = 1, next if $opt eq '-n';
    $_use_headers = 1, next if $opt eq '-h';
    $_begin = shift, next if $opt eq '-b';
    $_end = shift, next if $opt eq '-e';
    $_sep = shift, next if $opt eq '-F';
    $_quote = shift, next if $opt eq '-Q';
    $_escape = shift, next if $opt eq '-E';
    die $_usage;
}

die $_usage unless @ARGV > 0;

my $_expr = shift;

my $_csv = Text::CSV_XS->new({ sep_char => $_sep, quote_char => $_quot
+e,
                  escape_char => $_escape, binary => 1,
                  eol => "\n" });

unshift(@ARGV, '-') unless @ARGV;

{
    no strict;
    eval $_begin;
    die $@ if $@;
}

my %F;
my $_tied;

while ($ARGV = shift) {
    open(_IN, $ARGV);
    my $_fields;
    while ($_fields = $_csv->getline(\*main::_IN) and @$_fields) {
        my(@F) = @$_fields;
        if ($_use_headers) {
            if ($. == 1) {
                $_tied = tie %F, 'Tie::FieldNames', @F;
            }
            $_tied->setcurrent(\@F);
        }
        # This means you can use next, last, and redo in expr
        # without excessive noise. Also turn off strictness.
        no warnings "exiting";
        no strict;
        eval $_expr;
        die $@ if $@;
        $_csv->print(STDOUT, [ grep { defined } @F ]) unless $_silent;
    }
}

if ($_use_headers) {
    undef $_tied;
    untie %F;
}

{
    no strict;
    eval $_end;
    die $@ if $@;
}
[download]

A word game
1 direct reply — Read more / Contribute by jwkrahn
on Nov 05, 2022 at 21:15

A word game program, similar to "Wordle".

Now with Term::ReadKey

#!/usr/bin/perl
use warnings;
use strict;

# Version 1.0

my $me = $0 =~ s|.*/||r;
my $usage = <<USAGE;
usage: $me -h -g N -w N -f WORD_FILE

    -h   This help message.
    -g   Number of guesses
         Defaults to 6
    -w   Word length
         Defaults to 5
    -f   Word file to use
         Defaults to /usr/share/dict/words

USAGE


use Getopt::Std;

getopts( 'hg:w:f:', \my %opts ) or die $usage;
die $usage if exists $opts{ h };


use Term::ReadKey;

ReadMode 4;
END { ReadMode 0; }


use Term::ANSIColor ':constants';

my $clear = `clear`;
my $reset = RESET;
my $white_on_red    = BRIGHT_WHITE . ON_RED;
my $white_on_green  = BRIGHT_WHITE . ON_GREEN;
my $white_on_yellow = BRIGHT_WHITE . ON_YELLOW;
my $white_on_gray   = BRIGHT_WHITE . ON_BRIGHT_BLACK;
my $pre  = qr/\e\[\d+m\e\[\d+m/;    # colour
my $post = qr/\e\[0m/;                # reset


# guesses allowed = number of lines displayed
my $guesses   = $opts{ g } || 6;
# length of words to use
my $word_size = $opts{ w } || 5;
# file name to use
my $file_name = $opts{ f } || '/usr/share/dict/words';


my $divider = '   ---' x $word_size . "\n";

my $kb = <<KB;
  Q  W  E  R  T  Y  U  I  O  P 

   A  S  D  F  G  H  J  K  L 

    Z  X  C  V  B  N  M 

    BS    RET    ESC to exit

KB

my @lines = map [ ( '   ' ) x $word_size ], 1 .. $guesses;

my $curr_line = 0;

my %dict;
{
    open my $FH, '<', $file_name or die "Cannot open '$file_name' beca
+use: $!";
    # exclude proper nouns and punctuation
    # words must have at least one vowel
    @dict{ map uc, grep /[aeiouy]/, map /^([a-z]{$word_size})$/, <$FH>
+ } = ();
    }
my $curr_word = ( keys %dict )[ rand keys %dict ];


my @letters;
{    local $| = 1;

    print
        $clear,
        "\n\n",
        map( { my $line = $_; $divider, ' ', map( " |$_|", @{ $lines[ 
+$line ] } ), "\n", $divider } 0 .. $#lines ),
        "\n\n",
        $kb,
        "\n";

    if ( $curr_line == @lines ) {
        print "\L$curr_word\n";
        last;
        }

    # Only accept keys we want to use
    # alphabetic, back space, return or escape
    my $key;
    1 until defined( $key = ReadLine( -1 ) ) && $key =~ /\A[a-zA-Z\177
+\n\e]\z/;

    last if $key eq "\e";

    if ( $key eq "\177" ) {
        pop @letters if @letters;
        for my $index ( 0 .. $#{ $lines[ $curr_line ] } ) {
            $lines[ $curr_line ][ $index ] = defined $letters[ $index 
+] ? " $letters[$index] " : '   ';
            }
        redo;
        }

    if ( $key =~ /\A[a-zA-Z]\z/ ) {
        push @letters, uc $key if @letters < $word_size;
        for my $index ( 0 .. $#{ $lines[ $curr_line ] } ) {
            $lines[ $curr_line ][ $index ] = defined $letters[ $index 
+] ? " $letters[$index] " : '   ';
            }
        redo;
        }

    if ( $key eq "\n" && @letters == $word_size ) {

        my $word = join '', @letters;

        # Not a valid five letter word
        unless ( exists $dict{ $word } ) {
            $lines[ $curr_line ] = [ map "$white_on_red $_ $reset", @l
+etters ];
            redo;
            }

        # The correct answer
        if ( $word eq $curr_word ) {
            $lines[ $curr_line ] = [ map "$white_on_green $_ $reset", 
+@letters ];
            for my $letter ( @letters ) {
                $kb =~ s/$pre? $letter $post?/$white_on_green $letter 
+$reset/;
                }
            $curr_line = @lines;
            redo;
            }

        # Default; all letters to white on gray
        $lines[ $curr_line ] = [ map "$white_on_gray $_ $reset", @lett
+ers ];
        for my $letter ( @letters ) {
            $kb =~ s/$pre? $letter $post?/$white_on_gray $letter $rese
+t/;
            }

        # Find exact matches
        my @found = ( 0 ) x $word_size;
        my $xor_word = $word ^ $curr_word;
        while ( $xor_word =~ /\0/g ) {
            $found[ $-[ 0 ] ] = 1;
            my $letter = $letters[ $-[ 0 ] ];
            $lines[ $curr_line ][ $-[ 0 ] ] = "$white_on_green $letter
+ $reset";
            $kb =~ s/$pre? $letter $post?/$white_on_green $letter $res
+et/;
            }

        my $curr_remains = join '', ( split //, $curr_word )[ grep !$f
+ound[ $_ ], 0 .. $#found ];

        # Find other correct letters
        while ( my ( $index, $letter ) = each @letters ) {
            next if $found[ $index ];
            if ( $curr_remains =~ s/$letter/ / ) {
                $lines[ $curr_line ][ $index ] = "$white_on_yellow $le
+tter $reset";
                $kb =~ s/$pre? $letter $post?/$white_on_yellow $letter
+ $reset/;
                }
            }

        ++$curr_line;
        @letters = ();
        }
    redo;
    }
[download]

Convert BMP to HTML
5 direct replies — Read more / Contribute by harangzsolt33
on Oct 30, 2022 at 00:57

I wrote a Perl script that reads a BMP file and converts it to pure HTML and then sends it to a file. Then I take the file and paste it here. Please don't punish me.

Improved reliability on the Windows platform with new MCE releases
1 direct reply — Read more / Contribute by marioroy
on Oct 10, 2022 at 05:02

MCE

1.880 Mon Oct 10 04:00:00 EST 2022

  * Improved reliability on the Windows platform.
  * Improved MCE::Mutex::Channel::timedwait on the Windows platform.
  * Improved MCE::Mutex::Channel performance on UNIX platforms.
  * Resolved edge case in MCE::Child reaching deadlock.
[download]

MCE::Shared

1.878 Mon Oct 10 04:00:00 EST 2022

  * Improved reliability on the Windows platform.
  * Added deeply-shared demonstration to POD.
[download]

Mutex

1.007 Mon Oct 10 04:00:00 EST 2022

  * Improved reliability on the Windows platform.
  * Improved Mutex::Channel::timedwait on the Windows platform.
  * Improved Mutex::Channel performance on UNIX platforms.
[download]

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