[plt-scheme] Parentheses and color

On Jul  4, hendrik at topoi.pooq.com wrote:
> On Tue, Jul 03, 2007 at 11:01:00PM -0400, Eli Barzilay wrote:
> > Say that you have this:
> > 
> >   (define (foo x y)
> >     (bar (blah x)
> >          y))
> > 
> > and you want to put the body in a parameterize.  IIUC, you'll stick
> > the "(parameterize ([my-param 1])" line, then the closing paren (which
> > you'll look for using colors (which will be confusing, because you
> > added a new paren so the colors don't match)), and then reindent.
> > 
> > Here's what I'll do:
> > 
> > * Put the cursor right before the "(bar ..." line
> > * `M-S-right'        (`M' is usually the `alt' key)
> > * `M-('              (that is, alt+shift+9 on a us keyboard)
> > * type "parameterize "
> > * `M-('
> > * `M-['
> > * type "my-param 1"
> > * `right' `right'    (to go to where the line should break)
> > * `enter'
> > * `M-S-right' `tab'  (to reindent the body)
> > 
> > If you follow this editing sequence, you'll see for yourself that
> > paren counting is never part of the game.  And much more better:
> > parens are there mostly to guide the editor -- in this editing
> > sequence you don't have to even look at them, you only use them to be
> > able to select the body in one key.
> 
> When I did this, I got
> 
> (define (foo x y)
>     S(bar (blah x)
>          y)(parameterize([mu-param 1])
>              S))
> 
> Is that was was desired?

A `M-' prefix is alt (usually) and a `S-' prefix is shift, so
`M-S-right' is holding alt+shift and pressing the right button.

-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                  http://www.barzilay.org/                 Maze is Life!