|
package File::Slurp;
|
|
|
|
use strict;
|
|
|
|
use Carp ;
|
|
use POSIX qw( :fcntl_h ) ;
|
|
use Fcntl qw( :DEFAULT ) ;
|
|
use Symbol ;
|
|
|
|
my $is_win32 = $^O =~ /win32/i ;
|
|
|
|
# Install subs for various constants that aren't set in older perls
|
|
# (< 5.005). Fcntl on old perls uses Exporter to define subs without a
|
|
# () prototype These can't be overridden with the constant pragma or
|
|
# we get a prototype mismatch. Hence this less than aesthetically
|
|
# appealing BEGIN block:
|
|
|
|
BEGIN {
|
|
unless( eval { defined SEEK_SET() } ) {
|
|
*SEEK_SET = sub { 0 };
|
|
*SEEK_CUR = sub { 1 };
|
|
*SEEK_END = sub { 2 };
|
|
}
|
|
|
|
unless( eval { defined O_BINARY() } ) {
|
|
*O_BINARY = sub { 0 };
|
|
*O_RDONLY = sub { 0 };
|
|
*O_WRONLY = sub { 1 };
|
|
}
|
|
|
|
unless ( eval { defined O_APPEND() } ) {
|
|
|
|
if ( $^O =~ /olaris/ ) {
|
|
*O_APPEND = sub { 8 };
|
|
*O_CREAT = sub { 256 };
|
|
*O_EXCL = sub { 1024 };
|
|
}
|
|
elsif ( $^O =~ /inux/ ) {
|
|
*O_APPEND = sub { 1024 };
|
|
*O_CREAT = sub { 64 };
|
|
*O_EXCL = sub { 128 };
|
|
}
|
|
elsif ( $^O =~ /BSD/i ) {
|
|
*O_APPEND = sub { 8 };
|
|
*O_CREAT = sub { 512 };
|
|
*O_EXCL = sub { 2048 };
|
|
}
|
|
}
|
|
}
|
|
|
|
# print "OS [$^O]\n" ;
|
|
|
|
# print "O_BINARY = ", O_BINARY(), "\n" ;
|
|
# print "O_RDONLY = ", O_RDONLY(), "\n" ;
|
|
# print "O_WRONLY = ", O_WRONLY(), "\n" ;
|
|
# print "O_APPEND = ", O_APPEND(), "\n" ;
|
|
# print "O_CREAT ", O_CREAT(), "\n" ;
|
|
# print "O_EXCL ", O_EXCL(), "\n" ;
|
|
|
|
use base 'Exporter' ;
|
|
use vars qw( %EXPORT_TAGS @EXPORT_OK $VERSION @EXPORT ) ;
|
|
|
|
%EXPORT_TAGS = ( 'all' => [
|
|
qw( read_file write_file overwrite_file append_file read_dir ) ] ) ;
|
|
|
|
@EXPORT = ( @{ $EXPORT_TAGS{'all'} } );
|
|
@EXPORT_OK = qw( slurp ) ;
|
|
|
|
$VERSION = '9999.13';
|
|
|
|
*slurp = \&read_file ;
|
|
|
|
sub read_file {
|
|
|
|
my( $file_name, %args ) = @_ ;
|
|
|
|
# set the buffer to either the passed in one or ours and init it to the null
|
|
# string
|
|
|
|
my $buf ;
|
|
my $buf_ref = $args{'buf_ref'} || \$buf ;
|
|
${$buf_ref} = '' ;
|
|
|
|
my( $read_fh, $size_left, $blk_size ) ;
|
|
|
|
# check if we are reading from a handle (glob ref or IO:: object)
|
|
|
|
if ( ref $file_name ) {
|
|
|
|
# slurping a handle so use it and don't open anything.
|
|
# set the block size so we know it is a handle and read that amount
|
|
|
|
$read_fh = $file_name ;
|
|
$blk_size = $args{'blk_size'} || 1024 * 1024 ;
|
|
$size_left = $blk_size ;
|
|
|
|
# DEEP DARK MAGIC. this checks the UNTAINT IO flag of a
|
|
# glob/handle. only the DATA handle is untainted (since it is from
|
|
# trusted data in the source file). this allows us to test if this is
|
|
# the DATA handle and then to do a sysseek to make sure it gets
|
|
# slurped correctly. on some systems, the buffered i/o pointer is not
|
|
# left at the same place as the fd pointer. this sysseek makes them
|
|
# the same so slurping with sysread will work.
|
|
|
|
eval{ require B } ;
|
|
|
|
if ( $@ ) {
|
|
|
|
@_ = ( \%args, <<ERR ) ;
|
|
Can't find B.pm with this Perl: $!.
|
|
That module is needed to slurp the DATA handle.
|
|
ERR
|
|
goto &_error ;
|
|
}
|
|
|
|
if ( B::svref_2object( $read_fh )->IO->IoFLAGS & 16 ) {
|
|
|
|
# set the seek position to the current tell.
|
|
|
|
sysseek( $read_fh, tell( $read_fh ), SEEK_SET ) ||
|
|
croak "sysseek $!" ;
|
|
}
|
|
}
|
|
else {
|
|
|
|
# a regular file. set the sysopen mode
|
|
|
|
my $mode = O_RDONLY ;
|
|
|
|
#printf "RD: BINARY %x MODE %x\n", O_BINARY, $mode ;
|
|
|
|
# open the file and handle any error
|
|
|
|
$read_fh = gensym ;
|
|
unless ( sysopen( $read_fh, $file_name, $mode ) ) {
|
|
@_ = ( \%args, "read_file '$file_name' - sysopen: $!");
|
|
goto &_error ;
|
|
}
|
|
|
|
binmode($read_fh, $args{'binmode'}) if $args{'binmode'};
|
|
|
|
# get the size of the file for use in the read loop
|
|
|
|
$size_left = -s $read_fh ;
|
|
|
|
unless( $size_left ) {
|
|
|
|
$blk_size = $args{'blk_size'} || 1024 * 1024 ;
|
|
$size_left = $blk_size ;
|
|
}
|
|
}
|
|
|
|
# infinite read loop. we exit when we are done slurping
|
|
|
|
while( 1 ) {
|
|
|
|
# do the read and see how much we got
|
|
|
|
my $read_cnt = sysread( $read_fh, ${$buf_ref},
|
|
$size_left, length ${$buf_ref} ) ;
|
|
|
|
if ( defined $read_cnt ) {
|
|
|
|
# good read. see if we hit EOF (nothing left to read)
|
|
|
|
last if $read_cnt == 0 ;
|
|
|
|
# loop if we are slurping a handle. we don't track $size_left then.
|
|
|
|
next if $blk_size ;
|
|
|
|
# count down how much we read and loop if we have more to read.
|
|
$size_left -= $read_cnt ;
|
|
last if $size_left <= 0 ;
|
|
next ;
|
|
}
|
|
|
|
# handle the read error
|
|
|
|
@_ = ( \%args, "read_file '$file_name' - sysread: $!");
|
|
goto &_error ;
|
|
}
|
|
|
|
# fix up cr/lf to be a newline if this is a windows text file
|
|
|
|
${$buf_ref} =~ s/\015\012/\n/g if $is_win32 && !$args{'binmode'} ;
|
|
|
|
# this is the 5 returns in a row. each handles one possible
|
|
# combination of caller context and requested return type
|
|
|
|
my $sep = $/ ;
|
|
$sep = '\n\n+' if defined $sep && $sep eq '' ;
|
|
|
|
# caller wants to get an array ref of lines
|
|
|
|
# this split doesn't work since it tries to use variable length lookbehind
|
|
# the m// line works.
|
|
# return [ split( m|(?<=$sep)|, ${$buf_ref} ) ] if $args{'array_ref'} ;
|
|
return [ length(${$buf_ref}) ? ${$buf_ref} =~ /(.*?$sep|.+)/sg : () ]
|
|
if $args{'array_ref'} ;
|
|
|
|
# caller wants a list of lines (normal list context)
|
|
|
|
# same problem with this split as before.
|
|
# return split( m|(?<=$sep)|, ${$buf_ref} ) if wantarray ;
|
|
return length(${$buf_ref}) ? ${$buf_ref} =~ /(.*?$sep|.+)/sg : ()
|
|
if wantarray ;
|
|
|
|
# caller wants a scalar ref to the slurped text
|
|
|
|
return $buf_ref if $args{'scalar_ref'} ;
|
|
|
|
# caller wants a scalar with the slurped text (normal scalar context)
|
|
|
|
return ${$buf_ref} if defined wantarray ;
|
|
|
|
# caller passed in an i/o buffer by reference (normal void context)
|
|
|
|
return ;
|
|
}
|
|
|
|
sub write_file {
|
|
|
|
my $file_name = shift ;
|
|
|
|
# get the optional argument hash ref from @_ or an empty hash ref.
|
|
|
|
my $args = ( ref $_[0] eq 'HASH' ) ? shift : {} ;
|
|
|
|
my( $buf_ref, $write_fh, $no_truncate, $orig_file_name, $data_is_ref ) ;
|
|
|
|
# get the buffer ref - it depends on how the data is passed into write_file
|
|
# after this if/else $buf_ref will have a scalar ref to the data.
|
|
|
|
if ( ref $args->{'buf_ref'} eq 'SCALAR' ) {
|
|
|
|
# a scalar ref passed in %args has the data
|
|
# note that the data was passed by ref
|
|
|
|
$buf_ref = $args->{'buf_ref'} ;
|
|
$data_is_ref = 1 ;
|
|
}
|
|
elsif ( ref $_[0] eq 'SCALAR' ) {
|
|
|
|
# the first value in @_ is the scalar ref to the data
|
|
# note that the data was passed by ref
|
|
|
|
$buf_ref = shift ;
|
|
$data_is_ref = 1 ;
|
|
}
|
|
elsif ( ref $_[0] eq 'ARRAY' ) {
|
|
|
|
# the first value in @_ is the array ref to the data so join it.
|
|
|
|
${$buf_ref} = join '', @{$_[0]} ;
|
|
}
|
|
else {
|
|
|
|
# good old @_ has all the data so join it.
|
|
|
|
${$buf_ref} = join '', @_ ;
|
|
}
|
|
|
|
# see if we were passed a open handle to spew to.
|
|
|
|
if ( ref $file_name ) {
|
|
|
|
# we have a handle. make sure we don't call truncate on it.
|
|
|
|
$write_fh = $file_name ;
|
|
$no_truncate = 1 ;
|
|
}
|
|
else {
|
|
|
|
# spew to regular file.
|
|
|
|
if ( $args->{'atomic'} ) {
|
|
|
|
# in atomic mode, we spew to a temp file so make one and save the original
|
|
# file name.
|
|
$orig_file_name = $file_name ;
|
|
$file_name .= ".$$" ;
|
|
}
|
|
|
|
# set the mode for the sysopen
|
|
|
|
my $mode = O_WRONLY | O_CREAT ;
|
|
$mode |= O_APPEND if $args->{'append'} ;
|
|
$mode |= O_EXCL if $args->{'no_clobber'} ;
|
|
|
|
#printf "WR: BINARY %x MODE %x\n", O_BINARY, $mode ;
|
|
|
|
# open the file and handle any error.
|
|
|
|
$write_fh = gensym ;
|
|
unless ( sysopen( $write_fh, $file_name, $mode ) ) {
|
|
@_ = ( $args, "write_file '$file_name' - sysopen: $!");
|
|
goto &_error ;
|
|
}
|
|
|
|
binmode($write_fh, $args->{'binmode'}) if $args->{'binmode'};
|
|
}
|
|
|
|
sysseek( $write_fh, 0, SEEK_END ) if $args->{'append'} ;
|
|
|
|
|
|
#print 'WR before data ', unpack( 'H*', ${$buf_ref}), "\n" ;
|
|
|
|
# fix up newline to write cr/lf if this is a windows text file
|
|
|
|
if ( $is_win32 && !$args->{'binmode'} ) {
|
|
|
|
# copy the write data if it was passed by ref so we don't clobber the
|
|
# caller's data
|
|
$buf_ref = \do{ my $copy = ${$buf_ref}; } if $data_is_ref ;
|
|
${$buf_ref} =~ s/\n/\015\012/g ;
|
|
}
|
|
|
|
#print 'after data ', unpack( 'H*', ${$buf_ref}), "\n" ;
|
|
|
|
# get the size of how much we are writing and init the offset into that buffer
|
|
|
|
my $size_left = length( ${$buf_ref} ) ;
|
|
my $offset = 0 ;
|
|
|
|
# loop until we have no more data left to write
|
|
|
|
do {
|
|
|
|
# do the write and track how much we just wrote
|
|
|
|
my $write_cnt = syswrite( $write_fh, ${$buf_ref},
|
|
$size_left, $offset ) ;
|
|
|
|
unless ( defined $write_cnt ) {
|
|
|
|
# the write failed
|
|
@_ = ( $args, "write_file '$file_name' - syswrite: $!");
|
|
goto &_error ;
|
|
}
|
|
|
|
# track much left to write and where to write from in the buffer
|
|
|
|
$size_left -= $write_cnt ;
|
|
$offset += $write_cnt ;
|
|
|
|
} while( $size_left > 0 ) ;
|
|
|
|
# we truncate regular files in case we overwrite a long file with a shorter file
|
|
# so seek to the current position to get it (same as tell()).
|
|
|
|
truncate( $write_fh,
|
|
sysseek( $write_fh, 0, SEEK_CUR ) ) unless $no_truncate ;
|
|
|
|
close( $write_fh ) ;
|
|
|
|
# handle the atomic mode - move the temp file to the original filename.
|
|
|
|
rename( $file_name, $orig_file_name ) if $args->{'atomic'} ;
|
|
|
|
return 1 ;
|
|
}
|
|
|
|
# this is for backwards compatibility with the previous File::Slurp module.
|
|
# write_file always overwrites an existing file
|
|
|
|
*overwrite_file = \&write_file ;
|
|
|
|
# the current write_file has an append mode so we use that. this
|
|
# supports the same API with an optional second argument which is a
|
|
# hash ref of options.
|
|
|
|
sub append_file {
|
|
|
|
# get the optional args hash ref
|
|
my $args = $_[1] ;
|
|
if ( ref $args eq 'HASH' ) {
|
|
|
|
# we were passed an args ref so just mark the append mode
|
|
|
|
$args->{append} = 1 ;
|
|
}
|
|
else {
|
|
|
|
# no args hash so insert one with the append mode
|
|
|
|
splice( @_, 1, 0, { append => 1 } ) ;
|
|
}
|
|
|
|
# magic goto the main write_file sub. this overlays the sub without touching
|
|
# the stack or @_
|
|
|
|
goto &write_file
|
|
}
|
|
|
|
# basic wrapper around opendir/readdir
|
|
|
|
sub read_dir {
|
|
|
|
my ($dir, %args ) = @_;
|
|
|
|
# this handle will be destroyed upon return
|
|
|
|
local(*DIRH);
|
|
|
|
# open the dir and handle any errors
|
|
|
|
unless ( opendir( DIRH, $dir ) ) {
|
|
|
|
@_ = ( \%args, "read_dir '$dir' - opendir: $!" ) ;
|
|
goto &_error ;
|
|
}
|
|
|
|
my @dir_entries = readdir(DIRH) ;
|
|
|
|
@dir_entries = grep( $_ ne "." && $_ ne "..", @dir_entries )
|
|
unless $args{'keep_dot_dot'} ;
|
|
|
|
return @dir_entries if wantarray ;
|
|
return \@dir_entries ;
|
|
}
|
|
|
|
# error handling section
|
|
#
|
|
# all the error handling uses magic goto so the caller will get the
|
|
# error message as if from their code and not this module. if we just
|
|
# did a call on the error code, the carp/croak would report it from
|
|
# this module since the error sub is one level down on the call stack
|
|
# from read_file/write_file/read_dir.
|
|
|
|
|
|
my %err_func = (
|
|
'carp' => \&carp,
|
|
'croak' => \&croak,
|
|
) ;
|
|
|
|
sub _error {
|
|
|
|
my( $args, $err_msg ) = @_ ;
|
|
|
|
# get the error function to use
|
|
|
|
my $func = $err_func{ $args->{'err_mode'} || 'croak' } ;
|
|
|
|
# if we didn't find it in our error function hash, they must have set
|
|
# it to quiet and we don't do anything.
|
|
|
|
return unless $func ;
|
|
|
|
# call the carp/croak function
|
|
|
|
$func->($err_msg) ;
|
|
|
|
# return a hard undef (in list context this will be a single value of
|
|
# undef which is not a legal in-band value)
|
|
|
|
return undef ;
|
|
}
|
|
|
|
1;
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
File::Slurp - Efficient Reading/Writing of Complete Files
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use File::Slurp;
|
|
|
|
my $text = read_file( 'filename' ) ;
|
|
my @lines = read_file( 'filename' ) ;
|
|
|
|
write_file( 'filename', @lines ) ;
|
|
|
|
use File::Slurp qw( slurp ) ;
|
|
|
|
my $text = slurp( 'filename' ) ;
|
|
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This module provides subs that allow you to read or write entire files
|
|
with one simple call. They are designed to be simple to use, have
|
|
flexible ways to pass in or get the file contents and to be very
|
|
efficient. There is also a sub to read in all the files in a
|
|
directory other than C<.> and C<..>
|
|
|
|
These slurp/spew subs work for files, pipes and
|
|
sockets, and stdio, pseudo-files, and DATA.
|
|
|
|
=head2 B<read_file>
|
|
|
|
This sub reads in an entire file and returns its contents to the
|
|
caller. In list context it will return a list of lines (using the
|
|
current value of $/ as the separator including support for paragraph
|
|
mode when it is set to ''). In scalar context it returns the entire
|
|
file as a single scalar.
|
|
|
|
my $text = read_file( 'filename' ) ;
|
|
my @lines = read_file( 'filename' ) ;
|
|
|
|
The first argument to C<read_file> is the filename and the rest of the
|
|
arguments are key/value pairs which are optional and which modify the
|
|
behavior of the call. Other than binmode the options all control how
|
|
the slurped file is returned to the caller.
|
|
|
|
If the first argument is a file handle reference or I/O object (if ref
|
|
is true), then that handle is slurped in. This mode is supported so
|
|
you slurp handles such as C<DATA>, C<STDIN>. See the test handle.t
|
|
for an example that does C<open( '-|' )> and child process spews data
|
|
to the parant which slurps it in. All of the options that control how
|
|
the data is returned to the caller still work in this case.
|
|
|
|
NOTE: as of version 9999.06, read_file works correctly on the C<DATA>
|
|
handle. It used to need a sysseek workaround but that is now handled
|
|
when needed by the module itself.
|
|
|
|
You can optionally request that C<slurp()> is exported to your code. This
|
|
is an alias for read_file and is meant to be forward compatible with
|
|
Perl 6 (which will have slurp() built-in).
|
|
|
|
The options are:
|
|
|
|
=head3 binmode
|
|
|
|
If you set the binmode option, then the file will be slurped in binary
|
|
mode.
|
|
|
|
my $bin_data = read_file( $bin_file, binmode => ':raw' ) ;
|
|
# Or
|
|
my $bin_data = read_file( $bin_file, binmode => ':utf8' ) ;
|
|
|
|
=head3 array_ref
|
|
|
|
If this boolean option is set, the return value (only in scalar
|
|
context) will be an array reference which contains the lines of the
|
|
slurped file. The following two calls are equivalent:
|
|
|
|
my $lines_ref = read_file( $bin_file, array_ref => 1 ) ;
|
|
my $lines_ref = [ read_file( $bin_file ) ] ;
|
|
|
|
=head3 scalar_ref
|
|
|
|
If this boolean option is set, the return value (only in scalar
|
|
context) will be an scalar reference to a string which is the contents
|
|
of the slurped file. This will usually be faster than returning the
|
|
plain scalar.
|
|
|
|
my $text_ref = read_file( $bin_file, scalar_ref => 1 ) ;
|
|
|
|
=head3 buf_ref
|
|
|
|
You can use this option to pass in a scalar reference and the slurped
|
|
file contents will be stored in the scalar. This can be used in
|
|
conjunction with any of the other options.
|
|
|
|
my $text_ref = read_file( $bin_file, buf_ref => \$buffer,
|
|
array_ref => 1 ) ;
|
|
my @lines = read_file( $bin_file, buf_ref => \$buffer ) ;
|
|
|
|
=head3 blk_size
|
|
|
|
You can use this option to set the block size used when slurping from an already open handle (like \*STDIN). It defaults to 1MB.
|
|
|
|
my $text_ref = read_file( $bin_file, blk_size => 10_000_000,
|
|
array_ref => 1 ) ;
|
|
|
|
=head3 err_mode
|
|
|
|
You can use this option to control how read_file behaves when an error
|
|
occurs. This option defaults to 'croak'. You can set it to 'carp' or
|
|
to 'quiet to have no error handling. This code wants to carp and then
|
|
read abother file if it fails.
|
|
|
|
my $text_ref = read_file( $file, err_mode => 'carp' ) ;
|
|
unless ( $text_ref ) {
|
|
|
|
# read a different file but croak if not found
|
|
$text_ref = read_file( $another_file ) ;
|
|
}
|
|
|
|
# process ${$text_ref}
|
|
|
|
=head2 B<write_file>
|
|
|
|
This sub writes out an entire file in one call.
|
|
|
|
write_file( 'filename', @data ) ;
|
|
|
|
The first argument to C<write_file> is the filename. The next argument
|
|
is an optional hash reference and it contains key/values that can
|
|
modify the behavior of C<write_file>. The rest of the argument list is
|
|
the data to be written to the file.
|
|
|
|
write_file( 'filename', {append => 1 }, @data ) ;
|
|
write_file( 'filename', {binmode => ':raw' }, $buffer ) ;
|
|
|
|
As a shortcut if the first data argument is a scalar or array
|
|
reference, it is used as the only data to be written to the file. Any
|
|
following arguments in @_ are ignored. This is a faster way to pass in
|
|
the output to be written to the file and is equivilent to the
|
|
C<buf_ref> option. These following pairs are equivilent but the pass
|
|
by reference call will be faster in most cases (especially with larger
|
|
files).
|
|
|
|
write_file( 'filename', \$buffer ) ;
|
|
write_file( 'filename', $buffer ) ;
|
|
|
|
write_file( 'filename', \@lines ) ;
|
|
write_file( 'filename', @lines ) ;
|
|
|
|
If the first argument is a file handle reference or I/O object (if ref
|
|
is true), then that handle is slurped in. This mode is supported so
|
|
you spew to handles such as \*STDOUT. See the test handle.t for an
|
|
example that does C<open( '-|' )> and child process spews data to the
|
|
parant which slurps it in. All of the options that control how the
|
|
data is passes into C<write_file> still work in this case.
|
|
|
|
C<write_file> returns 1 upon successfully writing the file or undef if
|
|
it encountered an error.
|
|
|
|
The options are:
|
|
|
|
=head3 binmode
|
|
|
|
If you set the binmode option, then the file will be written in binary
|
|
mode.
|
|
|
|
write_file( $bin_file, {binmode => ':raw'}, @data ) ;
|
|
# Or
|
|
write_file( $bin_file, {binmode => ':utf8'}, @data ) ;
|
|
|
|
=head3 buf_ref
|
|
|
|
You can use this option to pass in a scalar reference which has the
|
|
data to be written. If this is set then any data arguments (including
|
|
the scalar reference shortcut) in @_ will be ignored. These are
|
|
equivilent:
|
|
|
|
write_file( $bin_file, { buf_ref => \$buffer } ) ;
|
|
write_file( $bin_file, \$buffer ) ;
|
|
write_file( $bin_file, $buffer ) ;
|
|
|
|
=head3 atomic
|
|
|
|
If you set this boolean option, the file will be written to in an
|
|
atomic fashion. A temporary file name is created by appending the pid
|
|
($$) to the file name argument and that file is spewed to. After the
|
|
file is closed it is renamed to the original file name (and rename is
|
|
an atomic operation on most OS's). If the program using this were to
|
|
crash in the middle of this, then the file with the pid suffix could
|
|
be left behind.
|
|
|
|
=head3 append
|
|
|
|
If you set this boolean option, the data will be written at the end of
|
|
the current file.
|
|
|
|
write_file( $file, {append => 1}, @data ) ;
|
|
|
|
C<write_file> croaks if it cannot open the file. It returns true if it
|
|
succeeded in writing out the file and undef if there was an
|
|
error. (Yes, I know if it croaks it can't return anything but that is
|
|
for when I add the options to select the error handling mode).
|
|
|
|
=head3 no_clobber
|
|
|
|
If you set this boolean option, an existing file will not be overwritten.
|
|
|
|
write_file( $file, {no_clobber => 1}, @data ) ;
|
|
|
|
=head3 err_mode
|
|
|
|
You can use this option to control how C<write_file> behaves when an
|
|
error occurs. This option defaults to 'croak'. You can set it to
|
|
'carp' or to 'quiet' to have no error handling other than the return
|
|
value. If the first call to C<write_file> fails it will carp and then
|
|
write to another file. If the second call to C<write_file> fails, it
|
|
will croak.
|
|
|
|
unless ( write_file( $file, { err_mode => 'carp', \$data ) ;
|
|
|
|
# write a different file but croak if not found
|
|
write_file( $other_file, \$data ) ;
|
|
}
|
|
|
|
=head2 overwrite_file
|
|
|
|
This sub is just a typeglob alias to write_file since write_file
|
|
always overwrites an existing file. This sub is supported for
|
|
backwards compatibility with the original version of this module. See
|
|
write_file for its API and behavior.
|
|
|
|
=head2 append_file
|
|
|
|
This sub will write its data to the end of the file. It is a wrapper
|
|
around write_file and it has the same API so see that for the full
|
|
documentation. These calls are equivilent:
|
|
|
|
append_file( $file, @data ) ;
|
|
write_file( $file, {append => 1}, @data ) ;
|
|
|
|
=head2 read_dir
|
|
|
|
This sub reads all the file names from directory and returns them to
|
|
the caller but C<.> and C<..> are removed by default.
|
|
|
|
my @files = read_dir( '/path/to/dir' ) ;
|
|
|
|
It croaks if it cannot open the directory.
|
|
|
|
In a list context C<read_dir> returns a list of the entries in the
|
|
directory. In a scalar context it returns an array reference which has
|
|
the entries.
|
|
|
|
=head3 keep_dot_dot
|
|
|
|
If this boolean option is set, C<.> and C<..> are not removed from the
|
|
list of files.
|
|
|
|
my @all_files = read_dir( '/path/to/dir', keep_dot_dot => 1 ) ;
|
|
|
|
=head2 EXPORT
|
|
|
|
read_file write_file overwrite_file append_file read_dir
|
|
|
|
=head2 SEE ALSO
|
|
|
|
An article on file slurping in extras/slurp_article.pod. There is
|
|
also a benchmarking script in extras/slurp_bench.pl.
|
|
|
|
=head2 BUGS
|
|
|
|
If run under Perl 5.004, slurping from the DATA handle will fail as
|
|
that requires B.pm which didn't get into core until 5.005.
|
|
|
|
=head1 AUTHOR
|
|
|
|
Uri Guttman, E<lt>uri@stemsystems.comE<gt>
|
|
|
|
=cut
|