NAME
File::Edit::Portable - Read and write files while keeping the original line-endings intact, no matter the platform.
SYNOPSIS
use File::Edit::Portable;
my $rw = File::Edit::Portable->new;
# read a file, replacing original file's line endings with
# that of the local platform's default
my $fh = $rw->read('file.txt');
# edit file in a loop, and re-write it with its original line endings
my $fh = $rw->read('file.txt');
my $wfh = $rw->tempfile;
while (<$fh>){
...
print $wfh $_;
}
$rw->write(contents => $wfh);
# get an array of the file's contents, with line endings stripped off
my @contents = $rw->read('file.txt');
# write out a file using original file's record separator, into a new file,
# preserving the original
$rw->write(contents => \@contents, copy => 'file2.txt');
# replace original file's record separator with a new (custom) one
$rw->write(recsep => "\r\n", contents => \@contents);
# rewrite all files in a directory recursively with local
# platform's default record separator
$rw->dir(dir => '/path/to/files');
# insert new data into a file after a specified line number
$rw->splice(file => 'file.txt', line => $num, insert => \@contents);
# insert new data into a file after a found search term
$rw->splice(file => 'file.txt', find => 'term', insert => \@contents);
# get a file's record separator
$rw->recsep('file.txt'); # string form
$rw->recsep('file.txt', 'hex'); # hex form
$rw->recsep('file.txt', 'type'); # line ending type (nix, win, mac, etc)DESCRIPTION
The default behaviour of perl is to read and write files using the Operating System's (OS) default record separator (line ending). If you open a file on an OS where the record separators are that of another OS, things can and do break.
This module will read in a file, keep track of the file's current record separators regardless of the OS, and save them for later writing. It can return either a file handle (in scalar context) that has had its line endings replaced with that of the local OS platform, or an array of the file's contents (in list context) with line endings stripped off. You can then modify this array and send it back in for writing to the same file or a new file, where the original file's line endings will be re-appended (or a custom ending if you so choose).
Uses are for dynamically reading/writing files while on one Operating System, but you don't know whether the record separators are platform-standard. Shared storage between multpile platforms are a good use case. This module affords you the ability to not have to check each file, and is very useful in looping over a directory where various files may have been written by different platforms.
EXPORT
None by default. See EXPORT_OK
EXPORT_OK
recsep(), platform_recsep()
METHODS
new
Returns a new File::Edit::Portable object.
read('file.txt')
In scalar context, will return a read-only file handle to a copy of the file that has had its line endings replaced with those of the local OS platform's record separator.
In list context, will return an array, where each element is a line from the file, with all line endings stripped off.
In both cases, we save the line endings that were found in the original file (which is used when write() is called, by default).
write
Writes the data back to the original file, or alternately a new file. Returns 1 on success. If you inadvertantly append newlines to the new elements of the contents array, we'll strip them off before appending the real newlines.
Parameters:
file => 'file.txt'
Not needed if you've used read() to open the file. However, if you have multiple read()s open, write() will die without the 'file' param, as it won't know which file you're wanting to write.
copy => 'file2.txt'
Set this if you want to write to an alternate (new) file, rather than the original.
contents => $filehandle or contents => \@contents
Mandatory - either an array with one line per element, or a file handle (file handle is far less memory-intensive).
recsep => "\r\n"
Optional - a double-quoted string of any characters you want to write as the line ending (record separator). This value will override what was found in the read() call. Common ones are "\r\n" for Windows, "\n" for Unix and "\r" for Mac. Use a call to platform_recsep() as the value to use the local platforms default separator.
splice
Inserts new data into a file after a specified line number or search term.
Parameters:
file => 'file.txt'
Mandatory.
insert => \@contents
Mandatory - an array reference containing the contents to merge into the file.
copy => 'file2.txt'
Optional - we'll read from file, but we'll write to this new file.
line => Integer
Optional - Merge the contents on the line following the one specified here.
find => 'search term'
Optional - Merge the contents into the file on the line following the first find of the search term. The search term is put into qr, so single quotes are recommended, and all regex patterns are honoured. Note that we also accept a pre-created qr// Regexp object directly (as opposed to a string).
limit => Integer
Optional - When splicing with the 'find' param, set this to the number of finds to insert after. Default is stop after the first find. Set to 0 will insert after all finds.
NOTE: Although both are optional, at least one of line or find must be sent in. If both are sent in, we'll warn, and operate on the line number and skip the find parameter.
Returns an array of the modified file contents.
dir
Rewrites the line endings in some or all files within a directory structure recursively. By default, rewrites all files with the current platform's default line ending. Returns an array of the names of the files found.
Parameters:
dir => '/path/to/files'
Mandatory.
types => ['*.txt', '*.dat']
Optional - Specify wildcard combinations for files to work on. We'll accept anything that File::Find::Rule::name() method does. If not supplied, we work on all files.
maxdepth => Integer
Optional - Specify how many levels of recursion to do after entering the directory. We'll do a full recurse through all sub-directories if this parameter is not set.
recsep => "\r\n"
Optional - If this parameter is not sent in, we'll replace the line endings with that of the current platform we're operating on. Otherwise, we'll use the double-quoted value sent in.
list => 1
Optional - If set to any true value, we'll return an array of the names of the files found, but won't take any editing action on them.
Default is disabled.
recsep('file.txt', $want)
Returns the record separator found within the file. If the file is empty, we'll return the local platform's default record separator.
The optional $want parameter can contain either 'hex' or 'type'. If 'hex' is sent in, the record separator will be returned in hex form (eg: "\0d\0a" for Windows). If 'type' is sent in, we'll return a short-form of the line-ending type (eg: win, nix, mac, etc).
Note that this method can be imported into your namespace on demand if you don't need the object functionality of the module.
platform_recsep($want)
Returns the the current platform's (OS) record separator in string form.
The optional $want parameter can contain either 'hex' or 'type'. If 'hex' is sent in, the record separator will be returned in hex form (eg: "\0d\0a" for Windows). If 'type' is sent in, we'll return a short-from of the line-ending type (eg: win, nix, mac, etc).
Note that this method can be imported into your namespace on demand if you don't need the object functionality of the module.
tempfile
Returns a file handle in write mode to an empty temp file.
AUTHOR
Steve Bertrand, <steveb at cpan.org>
BUGS
Please report any bugs or feature requests to https://github.com/stevieb9/file-edit-portable/issues
REPOSITORY
https://github.com/stevieb9/file-edit-portable
BUILD RESULTS (THIS VERSION)
CPAN Testers: http://matrix.cpantesters.org/?dist=File-Edit-Portable
SUPPORT
You can find documentation for this module with the perldoc command.
perldoc File::Edit::PortableLICENSE AND COPYRIGHT
Copyright 2022 Steve Bertrand.
This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.