Re: Parsing STDERR and STDOUT at the same time

You can redirect STDERR to STDOUT using the shell.

my $cvs_cmd = "cvs rlog -r$OLD::$NEW -SN $module";
my $cvs_pid = open my $cvs_pipe, '-|', "$cvs_cmd 2>&1"
    or die "Can't read pipe: $!";
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Then read from $cvs_pipe like any other file handle. The STDERR output will be mixed in with the STDOUT output.

I hear IPC::Run is good for this kind of thing, but I've never used it.

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Re^2: Parsing STDERR and STDOUT at the same time by qazwart (Scribe) on Feb 02, 2007 at 15:49 UTC
That's true about blending <STDERR> and <STDOUT> in the CVS command itself, but I don't want to mix up STDERR and STDOUT. I process STDOUT for the names of the files and the changes. The flow is pretty straight forward on finding the comments (likes after /^date:/ begin a comment. Comments end with a /^(-\|=)+$/. If STDERR was included in the mix, it makes it much harder to separate out that information. I also depend upon the fact that when a file isn't tagged with either release, the two lines that report this information appear one after the other in <STDERR>. This makes it very easy to determine when a file has one tag, but not the other (which means it was either added or deleted from the current release). If <STDOUT> and <STDERR> were merged, I could no longer make that assumption.	[reply]

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Re^2: Parsing STDERR and STDOUT at the same time
by qazwart (Scribe) on Feb 02, 2007 at 15:49 UTC

I process STDOUT for the names of the files and the changes. The flow is pretty straight forward on finding the comments (likes after /^date:/ begin a comment. Comments end with a /^(-|=)+$/. If STDERR was included in the mix, it makes it much harder to separate out that information.

I also depend upon the fact that when a file isn't tagged with either release, the two lines that report this information appear one after the other in <STDERR>. This makes it very easy to determine when a file has one tag, but not the other (which means it was either added or deleted from the current release). If <STDOUT> and <STDERR> were merged, I could no longer make that assumption.

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