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Editing: FileUtils.pm
# Copyright (C) 2003-2012 Free Software Foundation, Inc. # This program 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, or (at your option) # any later version. # This program 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 program. If not, see <http://www.gnu.org/licenses/>. ############################################################### # The main copy of this file is in Automake's git repository. # # Updates should be sent to automake-patches@gnu.org. # ############################################################### package Autom4te::FileUtils; =head1 NAME Autom4te::FileUtils - handling files =head1 SYNOPSIS use Autom4te::FileUtils =head1 DESCRIPTION This perl module provides various general purpose file handling functions. =cut use 5.006; use strict; use Exporter; use File::stat; use IO::File; use Autom4te::Channels; use Autom4te::ChannelDefs; use vars qw (@ISA @EXPORT); @ISA = qw (Exporter); @EXPORT = qw (&open_quote &contents &find_file &mtime &update_file &up_to_date_p &xsystem &xsystem_hint &xqx &dir_has_case_matching_file &reset_dir_cache &set_dir_cache_file); =item C<open_quote ($file_name)> Quote C<$file_name> for open. =cut # $FILE_NAME # open_quote ($FILE_NAME) # ----------------------- # If the string $S is a well-behaved file name, simply return it. # If it starts with white space, prepend './', if it ends with # white space, add '\0'. Return the new string. sub open_quote($) { my ($s) = @_; if ($s =~ m/^\s/) { $s = "./$s"; } if ($s =~ m/\s$/) { $s = "$s\0"; } return $s; } =item C<find_file ($file_name, @include)> Return the first path for a C<$file_name> in the C<include>s. We match exactly the behavior of GNU M4: first look in the current directory (which includes the case of absolute file names), and then, if the file name is not absolute, look in C<@include>. If the file is flagged as optional (ends with C<?>), then return undef if absent, otherwise exit with error. =cut # $FILE_NAME # find_file ($FILE_NAME, @INCLUDE) # -------------------------------- sub find_file ($@) { use File::Spec; my ($file_name, @include) = @_; my $optional = 0; $optional = 1 if $file_name =~ s/\?$//; return File::Spec->canonpath ($file_name) if -e $file_name; if (!File::Spec->file_name_is_absolute ($file_name)) { foreach my $path (@include) { return File::Spec->canonpath (File::Spec->catfile ($path, $file_name)) if -e File::Spec->catfile ($path, $file_name) } } fatal "$file_name: no such file or directory" unless $optional; return undef; } =item C<mtime ($file)> Return the mtime of C<$file>. Missing files, or C<-> standing for C<STDIN> or C<STDOUT> are "obsolete", i.e., as old as possible. =cut # $MTIME # MTIME ($FILE) # ------------- sub mtime ($) { my ($file) = @_; return 0 if $file eq '-' || ! -f $file; my $stat = stat ($file) or fatal "cannot stat $file: $!"; return $stat->mtime; } =item C<update_file ($from, $to, [$force])> Rename C<$from> as C<$to>, preserving C<$to> timestamp if it has not changed, unless C<$force> is true (defaults to false). Recognize C<$to> = C<-> standing for C<STDIN>. C<$from> is always removed/renamed. =cut # &update_file ($FROM, $TO; $FORCE) # --------------------------------- sub update_file ($$;$) { my ($from, $to, $force) = @_; $force = 0 unless defined $force; my $SIMPLE_BACKUP_SUFFIX = $ENV{'SIMPLE_BACKUP_SUFFIX'} || '~'; use File::Compare; use File::Copy; if ($to eq '-') { my $in = new IO::File ("< " . open_quote ($from)); my $out = new IO::File (">-"); while ($_ = $in->getline) { print $out $_; } $in->close; unlink ($from) || fatal "cannot remove $from: $!"; return; } if (!$force && -f "$to" && compare ("$from", "$to") == 0) { # File didn't change, so don't update its mod time. msg 'note', "'$to' is unchanged"; unlink ($from) or fatal "cannot remove $from: $!"; return } if (-f "$to") { # Back up and install the new one. move ("$to", "$to$SIMPLE_BACKUP_SUFFIX") or fatal "cannot backup $to: $!"; move ("$from", "$to") or fatal "cannot rename $from as $to: $!"; msg 'note', "'$to' is updated"; } else { move ("$from", "$to") or fatal "cannot rename $from as $to: $!"; msg 'note', "'$to' is created"; } } =item C<up_to_date_p ($file, @dep)> Is C<$file> more recent than C<@dep>? =cut # $BOOLEAN # &up_to_date_p ($FILE, @DEP) # --------------------------- sub up_to_date_p ($@) { my ($file, @dep) = @_; my $mtime = mtime ($file); foreach my $dep (@dep) { if ($mtime < mtime ($dep)) { verb "up_to_date ($file): outdated: $dep"; return 0; } } verb "up_to_date ($file): up to date"; return 1; } =item C<handle_exec_errors ($command, [$expected_exit_code = 0], [$hint])> Display an error message for C<$command>, based on the content of C<$?> and C<$!>. Be quiet if the command exited normally with C<$expected_exit_code>. If C<$hint> is given, display that as well if the command failed to run at all. =cut sub handle_exec_errors ($;$$) { my ($command, $expected, $hint) = @_; $expected = 0 unless defined $expected; if (defined $hint) { $hint = "\n" . $hint; } else { $hint = ''; } $command = (split (' ', $command))[0]; if ($!) { fatal "failed to run $command: $!" . $hint; } else { use POSIX qw (WIFEXITED WEXITSTATUS WIFSIGNALED WTERMSIG); if (WIFEXITED ($?)) { my $status = WEXITSTATUS ($?); # Propagate exit codes. fatal ('', "$command failed with exit status: $status", exit_code => $status) unless $status == $expected; } elsif (WIFSIGNALED ($?)) { my $signal = WTERMSIG ($?); fatal "$command terminated by signal: $signal"; } else { fatal "$command exited abnormally"; } } } =item C<xqx ($command)> Same as C<qx> (but in scalar context), but fails on errors. =cut # xqx ($COMMAND) # -------------- sub xqx ($) { my ($command) = @_; verb "running: $command"; $! = 0; my $res = `$command`; handle_exec_errors $command if $?; return $res; } =item C<xsystem (@argv)> Same as C<system>, but fails on errors, and reports the C<@argv> in verbose mode. =cut sub xsystem (@) { my (@command) = @_; verb "running: @command"; $! = 0; handle_exec_errors "@command" if system @command; } =item C<xsystem_hint ($msg, @argv)> Same as C<xsystem>, but allows to pass a hint that will be displayed in case the command failed to run at all. =cut sub xsystem_hint (@) { my ($hint, @command) = @_; verb "running: @command"; $! = 0; handle_exec_errors "@command", 0, $hint if system @command; } =item C<contents ($file_name)> Return the contents of C<$file_name>. =cut # contents ($FILE_NAME) # --------------------- sub contents ($) { my ($file) = @_; verb "reading $file"; local $/; # Turn on slurp-mode. my $f = new Autom4te::XFile "< " . open_quote ($file); my $contents = $f->getline; $f->close; return $contents; } =item C<dir_has_case_matching_file ($DIRNAME, $FILE_NAME)> Return true iff $DIR contains a file name that matches $FILE_NAME case insensitively. We need to be cautious on case-insensitive case-preserving file systems (e.g. Mac OS X's HFS+). On such systems C<-f 'Foo'> and C<-f 'foO'> answer the same thing. Hence if a package distributes its own F<CHANGELOG> file, but has no F<ChangeLog> file, automake would still try to distribute F<ChangeLog> (because it thinks it exists) in addition to F<CHANGELOG>, although it is impossible for these two files to be in the same directory (the two file names designate the same file). =cut use vars '%_directory_cache'; sub dir_has_case_matching_file ($$) { # Note that print File::Spec->case_tolerant returns 0 even on MacOS # X (with Perl v5.8.1-RC3 at least), so do not try to shortcut this # function using that. my ($dirname, $file_name) = @_; return 0 unless -f "$dirname/$file_name"; # The file appears to exist, however it might be a mirage if the # system is case insensitive. Let's browse the directory and check # whether the file is really in. We maintain a cache of directories # so Automake doesn't spend all its time reading the same directory # again and again. if (!exists $_directory_cache{$dirname}) { error "failed to open directory '$dirname'" unless opendir (DIR, $dirname); $_directory_cache{$dirname} = { map { $_ => 1 } readdir (DIR) }; closedir (DIR); } return exists $_directory_cache{$dirname}{$file_name}; } =item C<reset_dir_cache ($dirname)> Clear C<dir_has_case_matching_file>'s cache for C<$dirname>. =cut sub reset_dir_cache ($) { delete $_directory_cache{$_[0]}; } =item C<set_dir_cache_file ($dirname, $file_name)> State that C<$dirname> contains C<$file_name> now. =cut sub set_dir_cache_file ($$) { my ($dirname, $file_name) = @_; $_directory_cache{$dirname}{$file_name} = 1 if exists $_directory_cache{$dirname}; } 1; # for require ### Setup "GNU" style for perl-mode and cperl-mode. ## Local Variables: ## perl-indent-level: 2 ## perl-continued-statement-offset: 2 ## perl-continued-brace-offset: 0 ## perl-brace-offset: 0 ## perl-brace-imaginary-offset: 0 ## perl-label-offset: -2 ## cperl-indent-level: 2 ## cperl-brace-offset: 0 ## cperl-continued-brace-offset: 0 ## cperl-label-offset: -2 ## cperl-extra-newline-before-brace: t ## cperl-merge-trailing-else: nil ## cperl-continued-statement-offset: 2 ## End:
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