Test oneliner using a temporary Makefile

Fix Perl-Toolchain-Gang#355

Double escaping '$' for Makefile usage is fine, but
we should not use such a syntax while testing and trying
to run the oneliner output.

We could consider unescpaing '$$', '{{', '}}'... (for dmake)
but a cleaner solution is to test the oneliner in a Makefile
itself.

Author: atoomic

t/oneliner.t

@@ -7,55 +7,117 @@ BEGIN {
 chdir 't';
 
 use Config;
-use MakeMaker::Test::Utils;
-use Test::More tests => 16;
+use MakeMaker::Test::Utils qw(makefile_name make_run run which_perl);
+use Test::More;
+use File::Temp qw[tempdir];
 use File::Spec;
+use Cwd;
 
-my $TB = Test::More->builder;
+my $TB   = Test::More->builder;
 my $perl = which_perl;
 
 BEGIN { use_ok('ExtUtils::MM') }
 
 my $mm = bless { NAME => "Foo", MAKE => $Config{make} }, 'MM';
-isa_ok($mm, 'ExtUtils::MakeMaker');
-isa_ok($mm, 'ExtUtils::MM_Any');
+isa_ok( $mm, 'ExtUtils::MakeMaker' );
+isa_ok( $mm, 'ExtUtils::MM_Any' );
 
+my $make = make_run();
 
-sub try_oneliner {
-    my($code, $switches, $expect, $name) = @_;
-    my $cmd = $mm->oneliner($code, $switches);
-    $cmd =~ s{\$\(ABSPERLRUN\)}{$perl};
+my $tmpdir = tempdir( CLEANUP => 1 );
 
-    # VMS likes to put newlines at the end of commands if there isn't
-    # one already.
-    $expect =~ s/([^\n])\z/$1\n/ if $^O eq 'VMS';
+my $cwd = getcwd;
+END { chdir $cwd if defined $cwd }    # so File::Temp can cleanup
 
-    $TB->is_eq(scalar `$cmd`, $expect, $name) || $TB->diag("oneliner:\n$cmd");
-}
+# run all these test from a temporary directory
+chdir($tmpdir) or die "Fail to change to tmp directory: $!";
 
 # Lets see how it deals with quotes.
-try_oneliner(q{print "foo'o", ' bar"ar'}, [],  q{foo'o bar"ar},  'quotes');
+try_oneliner( q{print "foo'o", ' bar"ar'}, [], q{foo'o bar"ar}, 'quotes' );
 
 # How about dollar signs?
-try_oneliner(q{$PATH = 'foo'; print $PATH},[], q{foo},   'dollar signs' );
+try_oneliner( q{my $PATH = 'foo'; print $PATH}, [], q{foo}, 'dollar signs' );
+try_oneliner( q{my %h = (1, 2); print $h{1}},   [], q{2},   '%h and $h' );
 
 # switches?
-try_oneliner(q{print 'foo'}, ['-l'],           "foo\n",       'switches' );
+try_oneliner( q{print 'foo'}, ['-l'], "foo\n", 'switches' );
 
 # some DOS-specific things
-try_oneliner(q{print " \" "}, [],  q{ " },  'single quote' );
-try_oneliner(q{print " < \" "}, [],  q{ < " },  'bracket, then quote' );
-try_oneliner(q{print " \" < "}, [],  q{ " < },  'quote, then bracket' );
-try_oneliner(q{print " < \"\" < \" < \" < "}, [],  q{ < "" < " < " < },  'quotes and brackets mixed' );
-try_oneliner(q{print " < \" | \" < | \" < \" < "}, [],  q{ < " | " < | " < " < },  'brackets, pipes and quotes' );
+try_oneliner( q{print " \" "},   [], q{ " },   'single quote' );
+try_oneliner( q{print " < \" "}, [], q{ < " }, 'bracket, then quote' );
+try_oneliner( q{print " \" < "}, [], q{ " < }, 'quote, then bracket' );
+try_oneliner(
+    q{print " < \"\" < \" < \" < "}, [], q{ < "" < " < " < },
+    'quotes and brackets mixed'
+);
+try_oneliner(
+    q{print " < \" | \" < | \" < \" < "}, [],
+    q{ < " | " < | " < " < }, 'brackets, pipes and quotes'
+);
 
 # some examples from http://www.autohotkey.net/~deleyd/parameters/parameters.htm#CPP
-try_oneliner(q{print q[ &<>^|()@ ! ]}, [],  q{ &<>^|()@ ! },  'example 8.1' );
-try_oneliner(q{print q[ &<>^|@()!"&<>^|@()! ]}, [],  q{ &<>^|@()!"&<>^|@()! },  'example 8.2' );
-try_oneliner(q{print q[ "&<>^|@() !"&<>^|@() !" ]}, [],  q{ "&<>^|@() !"&<>^|@() !" },  'example 8.3' );
-try_oneliner(q{print q[ "C:\TEST A\" ]}, [],  q{ "C:\TEST A\" },  'example 8.4' );
-try_oneliner(q{print q[ "C:\TEST %&^ A\" ]}, [],  q{ "C:\TEST %&^ A\" },  'example 8.5' );
+try_oneliner( q{print q[ &<>^|()@ ! ]}, [], q{ &<>^|()@ ! }, 'example 8.1' );
+try_oneliner(
+    q{print q[ &<>^|@()!"&<>^|@()! ]}, [],
+    q{ &<>^|@()!"&<>^|@()! }, 'example 8.2'
+);
+try_oneliner(
+    q{print q[ "&<>^|@() !"&<>^|@() !" ]}, [],
+    q{ "&<>^|@() !"&<>^|@() !" }, 'example 8.3'
+);
+try_oneliner(
+    q{print q[ "C:\TEST A\" ]}, [], q{ "C:\TEST A\" },
+    'example 8.4'
+);
+try_oneliner(
+    q{print q[ "C:\TEST %&^ A\" ]}, [], q{ "C:\TEST %&^ A\" },
+    'example 8.5'
+);
 
 # XXX gotta rethink the newline test.  The Makefile does newline
 # escaping, then the shell.
 
+done_testing;
+exit;
+
+sub try_oneliner {
+    my ( $code, $switches, $expect, $name ) = @_;
+    my $cmd = $mm->oneliner( $code, $switches );
+    $cmd =~ s{\$\(ABSPERLRUN\)}{$perl};
+
+    # VMS likes to put newlines at the end of commands if there isn't
+    # one already.
+    $expect =~ s/([^\n])\z/$1\n/ if $^O eq 'VMS';
+
+    my $Makefile = makefile_name();
+
+    my $content = Makefile_template($cmd);
+    write_file( $Makefile, $content );
+
+    my $output = run(qq{$make -s all});
+
+    my $ok = $TB->is_eq( $output, $expect, $name )
+        || $TB->diag("$Makefile:\n$content");
+
+    return $ok;
+}
+
+sub Makefile_template {
+    my ($RUN) = @_;
+    my $NOECHO = '@';
+
+    return <<"MAKEFILE";
+all:
+	${NOECHO} ${RUN}
+MAKEFILE
+}
+
+sub write_file {
+    my ( $f, $content ) = @_;
+
+    open( my $fh, '>', $f ) or die $!;
+    print {$fh} $content or die $!;
+    close $fh;
+
+    return;
+}