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jplindstrom (594)

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Journal of jplindstrom (594)

Monday January 07, 2008
11:31 AM

Emacs: reformat parameter lists

[ #35321 ]

So, this is a line-wrappingly long line.

my $link = API::Link->new({rel => 'meta:version', href => $uri->as_string, type => 'application/xml'}),

If you think that's not a long line, imagine a really long line with a lot of parameters for the sake of argument.

One param per line is much nicer in this case.

my $link = API::Link->new({
    rel => 'meta:version',
    href => $uri->as_string,
    type => 'application/xml',

But it is a bit of a hassle to reformat by hand. Manual drudgery which easily makes me lose focus on why I just just wrote that method call. Now, why did I create that $link again?

Here is some nice elisp I wrote to reformat parameter lists either into a single line, into multiple lines, or toggle between the two.

So just put the cursor somewhere inside the parameter list and hit C-o m p (or whatever key binding strikes your fancy, but this one will work well with out-of-the-box PerlySense conventions) and it will reformat things into the other layout.

Once you have the nice multi-line layout, you can also align the parameters if that makes things look more sensible. Hit C-o m a et voila:

my $link = API::Link->new({
    rel  => 'meta:version',
    href => $uri->as_string,
    type => 'application/xml',

Well, not that much difference with those parameter names, but I can't be arsed. You get the picture.


(Now I'm just waiting for someone to tell me I reinvented the wheel. I just couldn't find any.)

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  • Perl::Tidy is your friend! :)

    I don't manually format any code any more.

    • And you can make it do this, how?

      • Well Perl::Tidy turns this:

        my $blodrfrf= $c->model('Fdsfkjsdlfkajd')->find({ id => $id, otehrs => $sdfkjsd });

        into this:

        my $blodrfrf= $c->model('Fdsfkjsdlfkajd')
                ->find({ id => $id, otehrs => $sdfkjsd });

        instead of:

        my $blodrfrf= $c->model('Fdsfkjsdlfkajd')->find({
            id => $id,
            otehrs => $sdfkjsd,

        I'd appreciate any config hints you have, I just started and am currently trying to set it up to match our current c

      • I normally hit Command-Shift-H :P

        My .perltidyrc doesn't cuddle the ( and {, } and ) but I think I recall an option that covers that.

        Here's what that code looks like for me:

        my $link = API::Link->new(
                rel  => 'meta:version',
                href => $uri->as_string,
                type => 'application/xml'

  • cperl-mode handles most of this, but its implementation is sort of broken.  I guess I will be fixing that sometime soon.

    One nit on your elisp code... the style like this:


    Looks really weird.  All the close parens should be on the same line:


    This is the "official" emacs lisp standard, and I think most other Lisps like the same sort of formatting.