git

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#!/usr/bin/perl
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# Test t0000..t9999.sh for non portable shell scripts
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# This script can be called with one or more filenames as parameters
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use strict;
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use warnings;
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my $exit_code=0;
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my %func;
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sub err {
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	my $msg = shift;
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	s/^\s+//;
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	s/\s+$//;
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	s/\s+/ /g;
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	print "$ARGV:$.: error: $msg: $_\n";
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	$exit_code = 1;
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}
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# glean names of shell functions
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for my $i (@ARGV) {
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	open(my $f, '<', $i) or die "$0: $i: $!\n";
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	while (<$f>) {
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		$func{$1} = 1 if /^\s*(\w+)\s*\(\)\s*{\s*$/;
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	}
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	close $f;
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}
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my $line = '';
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while (<>) {
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	chomp;
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	$line .= $_;
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	# stitch together incomplete lines (those ending with "\")
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	next if $line =~ s/\\$//;
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	$_ = $line;
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	/\bcp\s+-a/ and err 'cp -a is not portable';
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	/\bsed\s+-[^efn]\s+/ and err 'sed option not portable (use only -n, -e, -f)';
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	/\becho\s+-[neE]/ and err 'echo with option is not portable (use printf)';
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	/^\s*declare\s+/ and err 'arrays/declare not portable';
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	/^\s*[^#]\s*which\s/ and err 'which is not portable (use type)';
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	/\btest\s+[^=]*==/ and err '"test a == b" is not portable (use =)';
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	/\bwc -l.*"\s*=/ and err '`"$(wc -l)"` is not portable (use test_line_count)';
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	/\bhead\s+-c\b/ and err 'head -c is not portable (use test_copy_bytes BYTES <file >out)';
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	/(?:\$\(seq|^\s*seq\b)/ and err 'seq is not portable (use test_seq)';
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	/\bgrep\b.*--file\b/ and err 'grep --file FILE is not portable (use grep -f FILE)';
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	/\b[ef]grep\b/ and err 'egrep/fgrep obsolescent (use grep -E/-F)';
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	/\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (use FOO=bar && export FOO)';
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	/\blocal\s+[A-Za-z0-9_]*=\$([A-Za-z0-9_{]|[(][^(])/ and
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		err q(quote "$val" in 'local var=$val');
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	/\b([A-Z0-9_]+=(\w*|(["']).*?\3)\s+)+(\w+)/ and !/test_env.+=/ and exists($func{$4}) and
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		err '"FOO=bar shell_func" is not portable (use test_env FOO=bar shell_func)';
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	$line = '';
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	# this resets our $. for each file
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	close ARGV if eof;
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}
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exit $exit_code;
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