fixed exception namespace

[scpubgit/System-Introspector.git] / lib / System / Introspector / Util.pm

diff --git a/lib/System/Introspector/Util.pm b/lib/System/Introspector/Util.pm
index f9c9d85..d699799 100644 (file)
--- a/lib/System/Introspector/Util.pm
+++ b/lib/System/Introspector/Util.pm
@@ -2,26 +2,93 @@ use strictures 1;
 
 package System::Introspector::Util;
 use Exporter 'import';
+use IPC::Run qw( run );
 
 our @EXPORT_OK = qw(
     handle_from_command
+    handle_from_file
+    output_from_command
+    output_from_file
+    lines_from_command
+    files_from_dir
     transform_exceptions
 );
 
+do {
+    package System::Introspector::_Exception;
+    use Moo;
+    has message => (is => 'ro');
+};
+
+sub fail { die System::Introspector::_Exception->new(message => shift) }
+sub is_report_exception { ref(shift) eq 'System::Introspector::_Exception' }
+
+sub files_from_dir {
+    my ($dir) = @_;
+    my $dh;
+    opendir $dh, $dir
+        or fail "Unable to read directory $dir: $!";
+    my @files;
+    while (defined( my $item = readdir $dh )) {
+        next if -d "$dir/$item";
+        push @files, $item;
+    }
+    return @files;
+}
+
 sub transform_exceptions (&) {
     my ($code) = @_;
-    local $@;
     my $result = eval { $code->() };
-    return { error => "$@" }
-        if $@;
+    if (my $error = $@) {
+        return { error => $error->message }
+            if is_report_exception $error;
+        die $@;
+    }
     return $result;
 }
 
+sub output_from_command {
+    my ($command, $in) = @_;
+    $in = ''
+        unless defined $in;
+    my ($out, $err) = ('', '');
+    my $ok = run($command, \$in, \$out, \$err);
+    return $out, $err, $ok
+        if wantarray;
+    $command = join ' ', @$command
+        if ref $command;
+    fail "Error running command ($command): $err"
+        unless $ok;
+    return $out;
+}
+
+sub lines_from_command {
+    my ($command) = @_;
+    my $output = output_from_command $command;
+    chomp $output;
+    return split m{\n}, $output;
+}
+
 sub handle_from_command {
     my ($command) = @_;
     open my $pipe, '-|', $command
-        or die "Unable to read from command '$command': $!\n";
+        or fail "Unable to read from command '$command': $!";
     return $pipe;
 }
 
+sub handle_from_file {
+    my ($file) = @_;
+    open my $fh, '<', $file
+        or fail "Unable to read $file: $!";
+    return $fh;
+}
+
+sub output_from_file {
+    my ($file) = @_;
+    my $fh = handle_from_file $file;
+    return <$fh>
+        if wantarray;
+    return do { local $/; <$fh> };
+}
+
 1;