compare media example (exiftool, ffprobe)

[barcat.git] / t / examples.t

diff --git a/t/examples.t b/t/examples.t
index 19c1377821983d7715e1aa62adde46a3c6cc43ed..874b94adbdcccb783fd735f4120ff17b7533c791 100755 (executable)
--- a/t/examples.t
+++ b/t/examples.t
@@ -1,7 +1,20 @@
 #!/usr/bin/env perl
 use 5.014;
 use warnings;
+use re '/ms';
+use IPC::Run 'run';
+
 use Test::More;
+{ # silence fail diagnostics because of single caller
+       no warnings 'redefine';
+       sub Test::Builder::_ok_debug {}
+}
+
+my %CMDARGS = (
+       ping => '-c 1',
+       curl => '-sS',
+       'cat \Khttpd/' => '/var/log/apache2/',
+);
 
 my $filename = 'barcat';
 open my $input, '<', $filename
@@ -9,12 +22,44 @@ open my $input, '<', $filename
 
 local $/ = "\n\n";
 while (readline $input) {
+       # find scriptlets in the appropriate section
        /^=head1 EXAMPLES/ ... /^=head1/ or next;
-       /^\h/ or next;
+       /^\h/ or next;  # indented code snippet
+       /\A\h*>/ and next;  # psql prompt
        chomp;
 
-       my ($name) = /[\h(]*([^|]+)/;
-       ok(qx($_), $name);
+       # compose an identifier from significant parts
+       do {
+               s/^\h+//;             # indentation
+               s/\\\n\s*//g;         # line continuations
+               s/^[(\h]+//;          # subshell
+               s/^echo\ .*?\|\s*//;  # preceding input
+               s/'(\S+)[^']*'/$1/g;  # quoted arguments
+               s/\|.*//;             # subsequent pipes
+               s/^cat\ //;           # local file
+               s/^curl\ // and do {  # remote url
+                       s/\ -.+//g;                 # download options
+                       s{//[^/\s]+/\K\S*(?=/)}{};  # subdirectories
+                       s{^https?://}{};            # http protocol
+               };
+       } for my $name = $_;
+
+       # prepare shell command to execute
+       my $cmd = $_;
+       while (my ($subcmd, $args) = each %CMDARGS) {
+               $subcmd .= " \\K", $args .= ' ' unless $subcmd =~ m/\\K/;
+               $cmd =~ s/\b$subcmd/$args/;
+       }
+       my @cmd = (bash => -c => "set -o pipefail\n$cmd");
+
+       # run and report unexpected results
+       ok(eval {
+               run(\@cmd, \undef, \my $output, \my $error);
+               die("error message:\n    $error\n") if $error;
+               $? == 0 or die "exit status ", $? >> 8, "\n";
+               length $output or die "empty output\n";
+               return 1;
+       }, $name) or diag("Failed command\n@cmd\nfrom $filename line $.: $@");
 }
 
 done_testing();