# vim: set et ts=4 sw=4:
#    Copyright 2012-2015 Angelo Naselli <anaselli@linux.it>
#    Copyright 2013-2015 Matteo Pasotti <matteo.pasotti@gmail.com>
#
#    This file is part of ManaTools
#
#    ManaTools is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 2 of the License, or
#    (at your option) any later version.
#
#    ManaTools is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with ManaTools.  If not, see <http://www.gnu.org/licenses/>.

package ManaTools::Shared;

=head1 NAME

ManaTools::Shared - ManaTools::Shared contains all the shared routines
                     needed by ManaTools and modules

=head1 SYNOPSIS



=head1 DESCRIPTION

This module collects all the routines shared between ManaTools and its modules.

=head1 EXPORT

    trim
    md5sum
    pathList2hash
    distName
    apcat
    inArray
    disable_x_screensaver
    enable_x_screensaver
    isProcessRunning
    custom_locale_dir
    devel_mode
    command_line
    help_requested

=head1 SUPPORT

You can find documentation for this module with the perldoc command:

    perldoc ManaTools::Shared

=head1 AUTHOR

Angelo Naselli <anaselli@linux.it>

=head1 COPYRIGHT and LICENSE

Copyright (C) 2013, Angelo Naselli.
Copyright (C) 2014, Matteo Pasotti.

This file is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this file.  If not, see <http://www.gnu.org/licenses/>.

=head1 FUNCTIONS

=cut

use strict;
use warnings;
use diagnostics;
use feature 'state';

use Digest::MD5;

use yui;
use base qw(Exporter);

our @EXPORT_OK = qw(
    trim
    md5sum
    pathList2hash
    distName
    apcat
    inArray
    disable_x_screensaver
    enable_x_screensaver
    isProcessRunning
    custom_locale_dir
    devel_mode
    command_line
    help_requested
);


=head1 VERSION

    Version 0.02

=cut

our $VERSION = '0.02';

# 2015-05-03 A.Naselli added locale_dir(), devel_mode() command_line()


#=============================================================

=head2 apcat

=head3 PARAMETERS

    $filename the name of the file to read

=head3 OUTPUT

    depending from the context it returns the content
    of the file as an array or a string

=head3 DESCRIPTION

    This function return the content of $filename or false/0
    if it fails

=cut

#=============================================================

sub apcat {
    my $fn = shift();
    my $fh = undef;
    my @content = ();
    open($fh, "<", $fn) || return 0;
    while(<$fh>)
    {
        push(@content, $_);
    }
    return (wantarray() ? @content : join('',@content));
}


#=============================================================

=head2 distName

=head3 OUTPUT

    $distname: name of the distributed package

=head3 DESCRIPTION

    This function return the distname, useful to retrieve data
    with File::ShareDir::dist_file and must be the same as into
    Makefile.PL (e.g. manatools)

=cut

#=============================================================

sub distName {
    return "manatools";
}


#=============================================================

=head2 trim

=head3 INPUT

    $st: String to be trimmed

=head3 OUTPUT

    $st: trimmed string

=head3 DESCRIPTION

This function trim the given string.

=cut

#=============================================================

sub trim {
    my ($st) = shift;
    $st =~s /^\s+//g;
    $st =~s /\s+$//g;
    return $st;
}

#=============================================================

=head2 inArray

=head3 INPUT

    $item: item to search
    $arr:  array container

=head3 OUTPUT

    true: if the array contains the item

=head3 DESCRIPTION

This method returns if an item is into the array container

=cut

#=============================================================
sub inArray {
    my ($item, $arr) = @_;

    return grep( /^$item$/, @{$arr} );
}


#=============================================================

=head2 md5sum

=head3 INPUT

    $filename: file for md5 calculation

=head3 OUTPUT

    md5 sum

=head3 DESCRIPTION

    compute MD5 for the given file

=cut

#=============================================================

sub md5sum {
    my @files = @_;

    my @md5 = map {
        my $sum;
        if (open(my $FILE, $_)) {
            binmode($FILE);
            $sum = Digest::MD5->new->addfile($FILE)->hexdigest;
            close($FILE);
        }
        $sum;
    } @files;
    return wantarray() ? @md5 : $md5[0];
}

#=============================================================

=head2 pathList2hash

=head3 INPUT

    $param : HASH ref containing
            paths     =>  ARRAY of string containing path like strings
            separator => item separator inside a single path
                        (default separator is /)

=head3 OUTPUT

    \%tree: HASH reference containing the same structur passed as ARRAY
            in a tree view form, leaves are undef.

=head3 DESCRIPTION

    This function return a tree representation of the given array.

=cut

#=============================================================

sub pathList2hash {
    my ($param) = @_;

    die "array of path is missing" if ! exists $param->{paths};
    my $separator = '/';
    $separator = $param->{separator} if $param->{separator};
    if ($separator eq "/" || $separator eq "|") {
        $separator = '\\' . $separator;
    }

    my %tree;
    for (@{$param->{paths}})
    {
        my $last = \\%tree;
        $last = \$$last->{$_} for split /$separator/;
    }

    return \%tree;
}

#=============================================================

=head2 disable_x_screensaver

=head3 DESCRIPTION

    if exists /usr/bin/xset disable screensaver

=cut

#=============================================================
sub disable_x_screensaver() {
    if (-e '/usr/bin/xset') {
        $ENV{PATH} = "/usr/bin:/usr/sbin";
        system ("/usr/bin/xset s off");
        system ("/usr/bin/xset -dpms");
    }
}

#=============================================================

=head2 enable_x_screensaver

=head3 DESCRIPTION

    if exists /usr/bin/xset enables screensaver

=cut

#=============================================================
sub enable_x_screensaver() {
    if (-e '/usr/bin/xset') {
        $ENV{PATH} = "/usr/bin:/usr/sbin";
        system ("/usr/bin/xset +dpms");
        system ("/usr/bin/xset s on");
        system ("/usr/bin/xset s reset");
    }
}

#=============================================================

=head2 isProcessRunning

=head3 INPUT

    $name: Process name
    $o_user: user who the process belongs to

=head3 OUTPUT

    $pid: process identifier

=head3 DESCRIPTION

    Function returns the process identifier if the given
    process is running

=cut

#=============================================================
sub isProcessRunning {
    my ($name, $o_user) = @_;
    my $user = $o_user || $ENV{USER};
    my @proc = `ps -o '%P %p %c' -u $user`;
    shift (@proc);
    foreach (@proc) {
        my ($ppid, $pid, $n) = /^\s*(\d+)\s+(\d+)\s+(.*)/;
        return $pid if $n eq $name && $ppid != 1 && $pid != $$;
    }
    return;
}

#=============================================================

=head2 command_line

=head3 OUTPUT

    $cmdline: given command line

=head3 DESCRIPTION

    returns the command line meant as yui::YCommandLine object

=cut

#=============================================================
sub command_line() {
    state $cmdline = new yui::YCommandLine;

    return $cmdline;
}

# TODO evaluate if using state also for $pos into
#      custom_locale_dir and devel_mode

#=============================================================

=head2 custom_locale_dir

=head3 OUTPUT

    locale_dir: custom locale directory or undef

=head3 DESCRIPTION

    returns the custom locale directory if given by
    command line using "--locales-dir path" or undef

=cut

#=============================================================
sub custom_locale_dir() {
    my $cmdline = ManaTools::Shared::command_line();
    my $pos     = $cmdline->find("--locales-dir");

    return ($pos > 0) ? $cmdline->arg($pos+1) : undef;
}

#=============================================================

=head2 devel_mode

=head3 OUTPUT

    boolean: 1 if --devel-mode is passed to command line, 0
               otherwhise

=head3 DESCRIPTION

    returns 1 if "--devel-mode" is passed to command line,
    modules should check this value to work in developer mode

=cut

#=============================================================
sub devel_mode() {
    my $cmdline = ManaTools::Shared::command_line();
    my $pos     = $cmdline->find("--devel-mode");

    return ($pos > 0) ? 1 : 0;
}

#=============================================================

=head2 help_requested

=head3 OUTPUT

    boolean: 1 if "--help" or "-h" is passed to command line, 0
               otherwhise

=head3 DESCRIPTION

    returns 1 if "--help" or "-h" is passed to command line,
    modules should check this value to work accordingly

=cut

#=============================================================
sub help_requested() {
    my $cmdline = ManaTools::Shared::command_line();
    my $pos     = $cmdline->find("--help");
    return 1 if $pos > 0;

    $pos        = $cmdline->find("--help");
    return 1 if $pos > 0;

    return 0;
}

1; # End of ManaTools::Shared