General.pm
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# autoconf -- create `configure' using m4 macros # Copyright (C) 2001-2004, 2006-2007, 2009-2012 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 3 of the License, 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/>. package Autom4te::General; =head1 NAME Autom4te::General - general support functions for Autoconf =head1 SYNOPSIS use Autom4te::General =head1 DESCRIPTION This perl module provides various general purpose support functions used in several executables of the Autoconf package. =cut use 5.006; use Exporter; use Autom4te::ChannelDefs; use Autom4te::Channels; use Autom4te::Getopt (); use File::Basename; use File::Path (); use File::stat; use IO::File; use Carp; use strict; use vars qw (@ISA @EXPORT); @ISA = qw (Exporter); # Variables we define and export. my @export_vars = qw ($debug $force $help $me $tmp $verbose $version); # Functions we define and export. my @export_subs = qw (&debug &getopt &shell_quote &mktmpdir &uniq); # Functions we forward (coming from modules we use). my @export_forward_subs = qw (&basename &dirname &fileparse); @EXPORT = (@export_vars, @export_subs, @export_forward_subs); # Variable we share with the main package. Be sure to have a single # copy of them: using `my' together with multiple inclusion of this # package would introduce several copies. =head2 Global Variables =over 4 =item C<$debug> Set this variable to 1 if debug messages should be enabled. Debug messages are meant for developers only, or when tracking down an incorrect execution. =cut use vars qw ($debug); $debug = 0; =item C<$force> Set this variable to 1 to recreate all the files, or to consider all the output files are obsolete. =cut use vars qw ($force); $force = undef; =item C<$help> Set to the help message associated with the option C<--help>. =cut use vars qw ($help); $help = undef; =item C<$me> The name of this application, for diagnostic messages. =cut use vars qw ($me); $me = basename ($0); =item C<$tmp> The name of the temporary directory created by C<mktmpdir>. Left C<undef> otherwise. =cut # Our tmp dir. use vars qw ($tmp); $tmp = undef; =item C<$verbose> Enable verbosity messages. These messages are meant for ordinary users, and typically make explicit the steps being performed. =cut use vars qw ($verbose); $verbose = 0; =item C<$version> Set to the version message associated to the option C<--version>. =cut use vars qw ($version); $version = undef; =back =cut ## ----- ## ## END. ## ## ----- ## =head2 Functions =over 4 =item C<END> Filter Perl's exit codes, delete any temporary directory (unless C<$debug>), and exit nonzero whenever closing C<STDOUT> fails. =cut # END # --- sub END { # $? contains the exit status we will return. # It was set using one of the following ways: # # 1) normal termination # this sets $? = 0 # 2) calling `exit (n)' # this sets $? = n # 3) calling die or friends (croak, confess...): # a) when $! is non-0 # this set $? = $! # b) when $! is 0 but $? is not # this sets $? = ($? >> 8) (i.e., the exit code of the # last program executed) # c) when both $! and $? are 0 # this sets $? = 255 # # Cases 1), 2), and 3b) are fine, but we prefer $? = 1 for 3a) and 3c). my $status = $?; $status = 1 if ($! && $! == $?) || $? == 255; # (Note that we cannot safely distinguish calls to `exit (n)' # from calls to die when `$! = n'. It's not big deal because # we only call `exit (0)' or `exit (1)'.) if (!$debug && defined $tmp && -d $tmp) { local $SIG{__WARN__} = sub { $status = 1; warn $_[0] }; File::Path::rmtree $tmp; } # This is required if the code might send any output to stdout # E.g., even --version or --help. So it's best to do it unconditionally. if (! close STDOUT) { print STDERR "$me: closing standard output: $!\n"; $? = 1; return; } $? = $status; } ## ----------- ## ## Functions. ## ## ----------- ## =item C<debug (@message)> If the debug mode is enabled (C<$debug> and C<$verbose>), report the C<@message> on C<STDERR>, signed with the name of the program. =cut # &debug(@MESSAGE) # ---------------- # Messages displayed only if $DEBUG and $VERBOSE. sub debug (@) { print STDERR "$me: ", @_, "\n" if $verbose && $debug; } =item C<getopt (%option)> Wrapper around C<Autom4te::Getopt::parse_options>. In addition to the user C<option>s, support C<-h>/C<--help>, C<-V>/C<--version>, C<-v>/C<--verbose>, C<-d>/C<--debug>, C<-f>/C<--force>. Conform to the GNU Coding Standards for error messages. =cut # getopt (%OPTION) # ---------------- # Handle the %OPTION, plus all the common options. sub getopt (%) { my (%option) = @_; %option = ("h|help" => sub { print $help; exit 0 }, "V|version" => sub { print $version; exit 0 }, "v|verbose" => sub { ++$verbose }, "d|debug" => sub { ++$debug }, 'f|force' => \$force, # User options last, so that they have precedence. %option); Autom4te::Getopt::parse_options (%option); setup_channel 'note', silent => !$verbose; setup_channel 'verb', silent => !$verbose; } =item C<shell_quote ($file_name)> Quote C<$file_name> for the shell. =cut # $FILE_NAME # shell_quote ($FILE_NAME) # ------------------------ # If the string $S is a well-behaved file name, simply return it. # If it contains white space, quotes, etc., quote it, and return # the new string. sub shell_quote($) { my ($s) = @_; if ($s =~ m![^\w+/.,-]!) { # Convert each single quote to '\'' $s =~ s/\'/\'\\\'\'/g; # Then single quote the string. $s = "'$s'"; } return $s; } =item C<mktmpdir ($signature)> Create a temporary directory which name is based on C<$signature>. Store its name in C<$tmp>. C<END> is in charge of removing it, unless C<$debug>. =cut # mktmpdir ($SIGNATURE) # --------------------- sub mktmpdir ($) { my ($signature) = @_; my $TMPDIR = $ENV{'TMPDIR'} || '/tmp'; my $quoted_tmpdir = shell_quote ($TMPDIR); # If mktemp supports dirs, use it. $tmp = `(umask 077 && mktemp -d $quoted_tmpdir/"${signature}XXXXXX") 2>/dev/null`; chomp $tmp; if (!$tmp || ! -d $tmp) { $tmp = "$TMPDIR/$signature" . int (rand 10000) . ".$$"; mkdir $tmp, 0700 or croak "$me: cannot create $tmp: $!\n"; } print STDERR "$me:$$: working in $tmp\n" if $debug; } =item C<uniq (@list)> Return C<@list> with no duplicates, keeping only the first occurrences. =cut # @RES # uniq (@LIST) # ------------ sub uniq (@) { my @res = (); my %seen = (); foreach my $item (@_) { if (! exists $seen{$item}) { $seen{$item} = 1; push (@res, $item); } } return wantarray ? @res : "@res"; } =item C<handle_exec_errors ($command)> Display an error message for C<$command>, based on the content of C<$?> and C<$!>. =cut # handle_exec_errors ($COMMAND) # ----------------------------- sub handle_exec_errors ($) { my ($command) = @_; $command = (split (' ', $command))[0]; if ($!) { error "failed to run $command: $!"; } else { use POSIX qw (WIFEXITED WEXITSTATUS WIFSIGNALED WTERMSIG); if (WIFEXITED ($?)) { my $status = WEXITSTATUS ($?); # WIFEXITED and WEXITSTATUS can alter $!, reset it so that # error() actually propagates the command's exit status, not $!. $! = 0; error "$command failed with exit status: $status"; } elsif (WIFSIGNALED ($?)) { my $signal = WTERMSIG ($?); # In this case we prefer to exit with status 1. $! = 1; error "$command terminated by signal: $signal"; } else { error "$command exited abnormally"; } } } =back =head1 SEE ALSO L<Autom4te::XFile> =head1 HISTORY Written by Alexandre Duret-Lutz E<lt>F<adl@gnu.org>E<gt> and Akim Demaille E<lt>F<akim@freefriends.org>E<gt>. =cut 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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