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#! perl

########################################################################

# Copyright (C) 2007 ERG Limited, All rights reserved

#

# Module name   : jats.sh

# Module type   : Makefile system

# Compiler(s)   : n/a

# Environment(s): jats

#

# Description   : A class to Locate Files

#                 Supportes:

#                   Wilcards

#                   Exclusions

#                   Recursion

#

# Usage:

#               my $search = JatsLocateFiles::new('JatsLocateFiles');

#               my $search = JatsLocateFiles->new();

#                  $search->recurse ( );

#                  $search->filter_in ( );

#                  $search->filter_in_re ( );

#                  $search->filter_out ( );

#                  $search->filter_out_re ( );

#                  $search->base_dir ()

#                  $search->has_filter ( );

#                  $search->full_path ( );

#                  $search->dirs_only ( );

#                  $search->dirs_too();             # Dirs have '/' appended

#                  $search->search ( );

#                  $search->results ( );

#

#......................................................................#

require 5.006_001;

use strict;

use warnings;

package JatsLocateFiles;

use JatsError;

use File::Find;

use ArrayHashUtils;

#-------------------------------------------------------------------------------

# Function        : new

#

# Description     : Create a new instance of a searcher

#

# Inputs          : class           - Class Name

#                   options

#                   Hash of user options

#                   Useful keys are:

#                       'recurse'

#                       'base_dir'

#                       'full_path'

#                       'dirs_only'

#

# Returns         : A reference to the new object of the specified class

#

sub new {

    my $class = shift;

    my $self  = {};

    $self->{full_path} = 0;

    $self->{recurse}  = 0;

    $self->{dirs_only}  = 0;

    $self->{dirs_too} = 0;

    $self->{exclude}  = [];

    $self->{include}  = [];

    $self->{base_dir} = undef;

    $self->{results}  = [];

    bless ($self, $class);

    #

    #   Process user arguments.

    #   These are treated as options. Leading '--' is optional

    #

    foreach ( @_ )

    {

        my $opt = '--' . $_;

        $opt =~ s~^----~--~;

        $self->option ($opt) || Error( "JatsLocateFiles:new. Unknown initialiser: $_");

    }

    return $self;

}

#-------------------------------------------------------------------------------

# Function        : recurse

#                   filter_in

#                   filter_in_re

#                   filter_out

#                   filter_out_re

#                   base_dir

#                   has_filter

#                   results

#                   full_path

#                   dirs_only

#                   dirs_too                    - Include dirs in the search

#

# Description     : Accessor functions

#

# Inputs          : class

#                   One argument (optional)

#

# Returns         : Current value of the data item

#

sub recurse

{

    my $self = shift;

    if (@_) { $self->{recurse} = shift }

    return $self->{recurse};

}

sub full_path

{

    my $self = shift;

    if (@_) { $self->{full_path} = shift }

    return $self->{full_path};

}

sub dirs_only

{

    my $self = shift;

    if (@_) { $self->{dirs_only} = shift }

    return $self->{dirs_only};

}

sub dirs_too

{

    my $self = shift;

    if (@_) { $self->{dirs_too} = shift }

    return $self->{dirs_too};

}

sub filter_in

{

    my $self = shift;

    if (@_) { push @{$self->{include}}, glob2pat( shift ) }

    return $self->{include};

}

sub filter_in_re

{

    my $self = shift;

    if (@_) { push @{$self->{include}}, shift }

    return $self->{include};

}

sub filter_out

{

    my $self = shift;

    if (@_) { push @{$self->{exclude}}, glob2pat( shift ) }

    return $self->{exclude};

}

sub filter_out_re

{

    my $self = shift;

    if (@_) { push @{$self->{exclude}}, shift }

    return $self->{exclude};

}

sub base_dir

{

    my $self = shift;

    if (@_) { $self->{base_dir} = shift }

    return $self->{base_dir};

}

sub has_filter

{

    my $self = shift;

    return ( ( @{$self->{include}} || @{$self->{exclude}} ) );

}

sub results

{

    my $self = shift;

    $self->{results} = \() unless ( exists $self->{results} );

    return wantarray ? @{$self->{results}} : 1 + $#{$self->{results}};

}

#-------------------------------------------------------------------------------

# Function        : option

#

# Description     : Function to simplify the processing of search arguments

#                   Given an argument this function will act on it or

#                   return false

#

# Inputs          : option          - One possible standard search option

#

# Returns         : True            - Option is a search option and its been

#                                     processed

#

sub option

{

    my ($self, $opt) = @_;

    my $result = 1;

    if ( $opt =~ m/^--Dir=(.+)/ ) {

        $self->base_dir ($1);

    } elsif ( $opt =~ m/^--Recurse/ ) {

        $self->recurse(1);

    } elsif ( $opt =~ m/^--NoRecurse/ ) {

        $self->recurse(0);

    } elsif ( $opt =~ m/^--NoFullPath/ ) {

        $self->full_path(0);

    } elsif ( $opt =~ m/^--FullPath/ ) {

        $self->full_path(1);

    } elsif ( $opt =~ m/^--FileListOnly/ ) {

        $self->full_path(0);

        $self->dirs_only(0);

    } elsif ( $opt =~ m/^--DirListOnly/ ) {

        $self->dirs_only(1);

    } elsif ( $opt =~ m/^--DirsToo/ ) {

        $self->dirs_too(1);

    } elsif ( $opt =~ m/^--FilterIn=(.+)/ ) {

        $self->filter_in ( $1 );

    } elsif ( $opt =~ m/^--FilterInRe=(.+)/ ) {

        $self->filter_in_re ( $1 );

    } elsif ( $opt =~ m/^--FilterOut=(.+)/ ) {

        $self->filter_out ( $1 );

    } elsif ( $opt =~ m/^--FilterOutRe=(.+)/ ) {

        $self->filter_out_re ( $1 );

    } else {

        $result = 0;

    }

    return $result;

}

#-------------------------------------------------------------------------------

# Function        : search

#

# Description     : This function performs the search for files as specified

#                   by the arguments already provided

#

# Inputs          : base_dir (Optional)

#

# Returns         : List of files that match the search criteria

#                   The base directory is not prepended

#                   The list is a simple list of file names

#

my @search_list;             # Must be global to avoid closure problems

my $search_len;

my $search_base_dir;

my $search_dirs_too;

sub search

{

    my $self = shift;

    $self->{base_dir} = $_[0] if (defined $_[0] );

    $self->{results} = ();

    #

    #   Ensure user has provided enough info

    #

    Error ("JatsLocateFiles: No base directory provided") unless ( $self->{base_dir} );

    #

    #   Clean up the user dir. Remove any trailing / as we will be adding it back

    #

    $self->{base_dir} =~ s~/*$~~g;

    #

    #   Init recursion information

    #   Needed to avoid closure interactions

    #

    @search_list = ();

    $search_len = 1 + length( $self->{base_dir} );

    #

    #   Create a list of candidate files

    #   If we are recursing the subtree, then this is a little harder

    #   If we are not recursing then we can't simply glob the directory as

    #   not all files are processed.

    #

    #   Will end up with a list of files that don't include $dir

    #

    if ( -d $self->{base_dir} )

    {

        if ( $self->{recurse} )

        {

            $search_dirs_too = $self->{dirs_too};

            $search_base_dir = $self->{base_dir};

            sub find_file_wanted

            {

                return if ( !$search_dirs_too && -d $_ );               # skip if current is dir and we are not including dirs

                return if ( $search_base_dir eq $File::Find::name );    # skip if current is base_dir as we dont include it

                my $file = $File::Find::name;

                $file .= '/' if ( -d $_ );

                push @search_list, substr($file, $search_len );

            }

            #

            #       Under Unix we need to follow symbolic links, but Perl's

            #       Find:find does not work with -follow under windows if the source

            #       path contains a drive letter.

            #

            #       Solution. Only use follow under non-windows systems.

            #                 Works as Windows does not have symlinks (yet).

            #

            my $follow_opt =  ($ENV{GBE_UNIX}  > 0);

            File::Find::find( {wanted => \&find_file_wanted, follow_fast => $follow_opt, follow_skip => 2 }, $self->{base_dir} );

        }

        else

        {

            local *DIR ;

            opendir DIR, $self->{base_dir} || die ("Cannot open $self->{base_dir}");

            foreach ( readdir( DIR ) )

            {

                next if /^\Q.\E$/;

                next if /^\Q..\E$/;

                next if ( !$self->{dirs_too} && -d "$self->{base_dir}/$_" );

                push @search_list, $_;

            }

            closedir DIR;

        }

    }

    my @result;

    if ( @{$self->{include}} || @{$self->{exclude}} )

    {

        #

        #   Filtering is present

        #   Apply the filterin rules and then the filter out rules

        #   If no filter-in rules, then assume that all files are allowed in and

        #   simply apply the filter-out rules.

        #

        my @patsin  = map { qr/$_/ } @{$self->{include}};

        my @patsout = map { qr/$_/ } @{$self->{exclude}};

    #    map { print "Include:$_\n"; } @{$self->{include}};

    #    map { print "Exclude:$_\n"; } @{$self->{exclude}};

        file:

        foreach my $rfile ( @search_list )

        {

            my $file = '/' . $rfile;

            if ( @{$self->{include}} )

            {

                my $in = 0;

                for my $pat (@patsin)

                {

                    if ( $file =~ /$pat/ )

                    {

                        $in = 1;

                        last;

                    }

                }

    #print "------- Not included $file\n" unless $in;

                next unless ( $in );

            }

            for my $pat (@patsout)

            {

    #print "------- REJECT $file :: $pat \n" if ( $file =~ /$pat/ );

                next file if ( $file =~ /$pat/ );

            }

            push @result, $rfile;

        }

    }

    else

    {

        @result = @search_list ;

    }

    @search_list = ();

    $self->{results} = [];;

    #

    #   Reattach the base directory, if required

    #       full_path  : Prepend full path

    #       dirs_only  : return list of dirs that have files

    #   Extract dirs only

    #

    foreach  ( @result )

    {

        my $path;

        if ( $self->{full_path} )

        {

            $path = $self->{base_dir} . '/' . $_;

        }

        else

        {

            $path = $_;

        }

        if ( $self->{dirs_only} )

        {

            $path =~ s~/[^/]*$~~;

        }

        UniquePush( $self->{results}, $path);

    }

#DebugDumpData ("Search", $self);

    return @{$self->{results}};

}

#-------------------------------------------------------------------------------

# Function        : glob2pat

#

# Description     : Convert four shell wildcard characters into their equivalent

#                   regular expression; all other characters are quoted to

#                   render them literals.

#

# Inputs          : Shell style wildcard pattern

#

# Returns         : Perl RE

#

sub glob2pat

{

    my $globstr = shift;

    $globstr =~ s~^/~~;

    my %patmap = (

        '*' => '[^/]*',

        '?' => '[^/]',

        '[' => '[',

        ']' => ']',

        '-' => '-',

    );

    $globstr =~ s{(.)} { $patmap{$1} || "\Q$1" }ge;

    return '/' . $globstr . '$';

}

#------------------------------------------------------------------------------

1;