Rewrote some sentences in the README file

[devedit.git] / modules / File / Access.pm

diff --git a/modules/File/Access.pm b/modules/File/Access.pm
index 31ad87dde4561393962b46c1008001c73f800639..af219a7d3be73f32a83d9f85d50443e6786f56d6 100644 (file)
--- a/modules/File/Access.pm
+++ b/modules/File/Access.pm
@@ -3,47 +3,153 @@ package File::Access;
 #
 # Dev-Editor - Module File::Access
 #
 #
 # Dev-Editor - Module File::Access
 #

-# Some simple routines for doing things with files
-# with only one command
+# Some simple routines for doing things with files by
+# using only one command

 #
 #

-# Author:        Patrick Canterino <patshaping@gmx.net>
-# Last modified: 2004-07-28
+# Author:        Patrick Canterino <patrick@patshaping.de>
+# Last modified: 2011-02-11
+#
+# Copyright (C) 1999-2000 Roland Bluethgen, Frank Schoenmann
+# Copyright (C) 2003-2011 Patrick Canterino
+# All Rights Reserved.
+#
+# This file can be distributed and/or modified under the terms of
+# of the Artistic License 2.0 (see also the LICENSE file found at
+# the top level of the Dev-Editor distribution).

 #
 
 use strict;
 
 #
 
 use strict;
 

-use vars qw(@EXPORT);
+use vars qw(@EXPORT
+            $has_flock
+            $has_archive_extract
+            $archive_extract_error);
+
+use Fcntl qw(:DEFAULT
+             :flock);

 
 

-use Carp qw(croak);
+use File::Copy;

 
 ### Export ###
 
 use base qw(Exporter);
 
 
 ### Export ###
 
 use base qw(Exporter);
 

-@EXPORT = qw(chgrp
+@EXPORT = qw(archive_unpack
+             dir_copy

              dir_read
              file_create
              dir_read
              file_create

+             file_lock

              file_read
              file_save
              file_read
              file_save

-             file_unlock);

 
 

-# chgrp()
+             LOCK_SH
+             LOCK_EX
+             LOCK_UN
+             LOCK_NB);
+
+# Check if flock() is available
+# I found this piece of code somewhere in the internet
+
+$has_flock = eval { local $SIG{'__DIE__'}; flock(STDOUT,0); 1 };
+
+# Check if Archive::Extract is available
+
+$has_archive_extract = eval { local $SIG{'__DIE__'}; require Archive::Extract; 1 };
+
+# Predeclaration of dir_copy()
+
+sub dir_copy($$);
+
+# archive_unpack()
+#
+# Unpack an archive
+# (archive type must be supported by Archive::Extract)
+#
+# Params: 1. Archive path
+#         2. Path to extract (optional)
+#
+# Return: - Status code (Boolean)
+#         - undef if Archive::Extract is not available
+
+sub archive_unpack($;$)
+{
+ my ($archive,$path) = @_;
+
+ return undef unless($has_archive_extract);
+
+ return unless(-f $archive);
+ return if($path && not -d $path);
+
+ my $ae = Archive::Extract->new(archive => $archive);
+ return unless($ae);
+
+ if($path)
+ {
+  if($ae->extract(to => $path))
+  {
+   return 1;
+  }
+  else
+  {
+   $archive_extract_error = $ae->error;
+   return;
+  }
+ }
+ else
+ {
+  if($ae->extract)
+  {
+   return 1;
+  }
+  else
+  {
+   $archive_extract_error = $ae->error;
+   return;
+  }
+ }
+}
+
+# dir_copy()

 #
 #

-# Change the group of files or directories
+# Copy a directory

 #
 #

-# Params: 1. Group name
-#         2. List of files
+# Params: 1. Directory to copy
+#         2. Target

 #
 #

-# Return: Number of files group successfully changed
-#         (or false)
+# Return: Status code (Boolean)

 
 

-sub chgrp($@)
+sub dir_copy($$)

 {
 {

- my ($group,@files) = @_;
- my $gid = getgrnam($group);
+ my ($dir,$target) = @_;
+
+ return unless(-d $dir);

 
 

- return unless($gid);
- return chown(-1,$gid,@files);
+ my $entries = dir_read($dir) or return;
+
+ my $dirs    = $entries->{'dirs'};
+ my $files   = $entries->{'files'};
+
+ mkdir($target,0777) unless(-d $target);
+
+ foreach my $directory(@$dirs)
+ {
+  unless(-d $target.'/'.$directory)
+  {
+   mkdir($target.'/'.$directory,0777) or next;
+  }
+
+  if(-r $target.'/'.$directory && -x $target.'/'.$directory)
+  {
+   dir_copy($dir.'/'.$directory,$target.'/'.$directory) or next;
+  }
+ }
+
+ foreach my $file(@$files)
+ {
+  copy($dir.'/'.$file,$target.'/'.$file) or next;
+ }
+
+ return 1;

 }
 
 # dir_read()
 }
 
 # dir_read()


@@ -53,7 +159,7 @@ sub chgrp($@)
 # Params: Directory
 #
 # Return: Hash reference: dirs  => directories
 # Params: Directory
 #
 # Return: Hash reference: dirs  => directories

-#                         files => files
+#                         files => files and symbolic links

 
 sub dir_read($)
 {
 
 sub dir_read($)
 {


@@ -77,9 +183,9 @@ sub dir_read($)
 
  foreach my $entry(@entries)
  {
 
  foreach my $entry(@entries)
  {

-  next if($entry eq "." || $entry eq "..");
+  next if($entry eq '.' || $entry eq '..');

 
 

-  if(-d $dir."/".$entry)
+  if(-d $dir.'/'.$entry && not -l $dir.'/'.$entry)

   {
    push(@dirs,$entry);
   }
   {
    push(@dirs,$entry);
   }


@@ -94,7 +200,11 @@ sub dir_read($)
 
 # file_create()
 #
 
 # file_create()
 #

-# Create a file
+# Create a file, but only if it doesn't already exist
+#
+# (I wanted to use O_EXCL for this, but `perldoc -f sysopen`
+# doesn't say that it is available on every system - so I
+# created this workaround using O_RDONLY and O_CREAT)

 #
 # Params: File to create
 #
 #
 # Params: File to create
 #


@@ -108,28 +218,53 @@ sub file_create($)
 
  return if(-e $file);
 
 
  return if(-e $file);
 

- open(FILE,">$file") or return;
- close(FILE)         or return;
+ sysopen(FILE,$file,O_RDONLY | O_CREAT) or return;
+ close(FILE)                            or return;

 
  return 1;
 }
 
 
  return 1;
 }
 

+# file_lock()
+#
+# System independent wrapper function for flock()
+# On systems where flock() is not available, this function
+# always returns true.
+#
+# Params: 1. Filehandle
+#         2. Locking mode
+#
+# Return: Status code (Boolean)
+
+sub file_lock(*$)
+{
+ my ($handle,$mode) = @_;
+
+ return 1 unless($has_flock);
+ return flock($handle,$mode);
+}
+

 # file_read()
 #
 # Read out a file completely
 #
 # file_read()
 #
 # Read out a file completely
 #

-# Params: File
+# Params: 1. File
+#         2. true  => open in binary mode
+#            false => open in normal mode (default)

 #
 # Return: Contents of the file (Scalar Reference)
 
 #
 # Return: Contents of the file (Scalar Reference)
 

-sub file_read($)
+sub file_read($;$)

 {
 {

- my $file = shift;
+ my ($file,$binary) = @_;

  local *FILE;
 
  local *FILE;
 

- open(FILE,"<$file") or return;
+ sysopen(FILE,$file,O_RDONLY) or return;
+ file_lock(FILE,LOCK_SH)      or do { close(FILE); return };
+ binmode(FILE) if($binary);
+

  read(FILE, my $content, -s $file);
  read(FILE, my $content, -s $file);

- close(FILE)         or return;
+
+ close(FILE)                  or return;

 
  return \$content;
 }
 
  return \$content;
 }


@@ -140,38 +275,25 @@ sub file_read($)
 #
 # Params: 1. File
 #         2. File content as Scalar Reference
 #
 # Params: 1. File
 #         2. File content as Scalar Reference

+#         3. true  => open in binary mode
+#            false => open in normal mode (default)

 #
 # Return: Status code (Boolean)
 
 #
 # Return: Status code (Boolean)
 

-sub file_save($$)
+sub file_save($$;$)

 {
 {

- my ($file,$content) = @_;
+ my ($file,$content,$binary) = @_;

  local *FILE;
 
  local *FILE;
 

- open(FILE,">$file")  or return;
- print FILE $$content or do { close(FILE); return };
- close(FILE)          or return;
+ sysopen(FILE,$file,O_WRONLY | O_CREAT | O_TRUNC) or return;
+ file_lock(FILE,LOCK_EX)                          or do { close(FILE); return };
+ binmode(FILE) if($binary);

 
 

- return 1;
-}
+ print FILE $$content                             or do { close(FILE); return };

 
 

-# file_unlock()
-#
-# Remove a file from the list of files in use
-#
-# Params: 1. File::UseList object
-#         2. File to remove
-#
-# Return: -nothing-
+ close(FILE)                                      or return;

 
 

-sub file_unlock($$)
-{
- my ($uselist,$file) = @_;
-
- $uselist->remove_file($file);
- $uselist->save;
-
- return;
+ return 1;

 }
 
 # it's true, baby ;-)
 }
 
 # it's true, baby ;-)