Re: Apache::DB with Emacs editor support

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Kim X Goldov wrote:

| Is it possible to use the Emacs GUD debugger when debugging
| handlers using Apache::DB? I've been successfully using Apache::DB
| with mod_perl1, and find the Emacs debugger useful for Perl
| scripts.

Yes you can: you need the latest version of Apache::DB. For now, you
have to run httpd -X to prevent it from forking, but I'm working on
that limitation.

You have to run a wrapper script around Apache, because Emacs insists
on fiddling with command line switches assuming that the real
/usr/bin/perl is used as the interpreter (which it won't). That
wrapper should run apache -X, after setting the following environment
variables:

~    * PERLDB_OPTS="TTY=$tty ReadLine=0 ornaments=0" where $tty is the
~      tty the wrapper script is attached to (obtained e.g. with
~      `/usr/bin/tty`)
~    * MOD_PERL_TRACE="dshg" (only relevant if mod_perl was compiled
~      with debugging on)

Here are appropriate httpd.conf snippets to honor this setup:

PerlPassEnv PERLDB_OPTS
PerlPassEnv MOD_PERL_TRACE
PerlPassEnv TERM

<Perl>
~   BEGIN { if ($ENV{PERLDB_OPTS}) {
~        require Apache::DB;
~        Apache::DB->init;
~        require 'Apache/perl5db.pl';
~        warn "Support for editor embedding (e.g. Emacs) enabled\n\n";
~        $DB::slave_editor=1;
~   }}

~    $DB::single = 1;

# Your usual <Perl> stuff goes here
</Perl>

Now launch Emacs, type M-x perldb <ret>, erase the minibuffer
contents, type in the path of your wrapper script followed by a bogus
command-line argument (e.g. "/home/dom/bin/apache-gud mod_perl"). The
debugger should stop at the "$DB::single = 1" line above.

Regards,

- --
Dominique QUATRAVAUX                           Ingénieur senior
01 44 42 00 08                                 IDEALX

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