bug#700: hideshow.el micro improvements

[Dan Nicolaescu <dann@ics.uci.edu>]

Dmitry Bolshakov <dmitry.bolshakov@bridge-quest.com> writes:

  > -------- Original Message  --------
  > Subject: Re: hideshow.el micro improvements
  > From: Chong Yidong <cyd@stupidchicken.com>
  > To: Dmitry Bolshakov <dmitry.bolshakov@bridge-quest.com>
  > Cc: 700@emacsbugs.donarmstrong.com
  > Date: 06.07.2009 18:18
  > 
  > >> 1. show
  > >>
  > >> xxx {...} yyy {...}
  > >>
  > >> instead of
  > >>
  > >> xxx {...
  > >> }

Can you please debug your change, as it has caused problems for lisp
files, see:

http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=3896

and 

http://lists.gnu.org/archive/html/emacs-devel/2009-07/msg00874.html

Thanks!

  > > You patch did not work properly for GNU-style braces.  I've checked in a
  > > fix that works a little better for both cases.
  > >
  > >> 2. in the hs-hide-level-recursive skip parenthesis inside comments
  > >> because of they can be unbalanced
  > >
  > > Could you give a test recipe that shows this bug?
  > >
  > >
  > hi, see attachment
  > 
  > open file
  > M-x hs-minor-mode
  > M-x eval-expression
  > (hs-hide-level 1)
  > 
  > and i get:
  > 
  > Debugger entered--Lisp error: (scan-error "Unbalanced parentheses" 60 156)
  >  scan-sexps(60 1)
  >  forward-sexp(1)
  >  funcall(forward-sexp 1)
  >  (progn (set-match-data match-data) (goto-char (match-beginning hs-block-start-mdata-select)) (funcall hs-forward-sexp-func arg))
  >  (unwind-protect (progn (set-match-data match-data) (goto-char ...) (funcall hs-forward-sexp-func arg)) (set-match-data save-match-data-internal (quote evaporate)))
  >  (let ((save-match-data-internal ...)) (unwind-protect (progn ... ... ...) (set-match-data save-match-data-internal ...)))
  >  (save-match-data (set-match-data match-data) (goto-char (match-beginning hs-block-start-mdata-select)) (funcall hs-forward-sexp-func arg))
  >  hs-forward-sexp((60 61 #<buffer unbalanced-braces-test.pl>) 1)
  >  (progn (hs-forward-sexp mdata 1) (end-of-line) (point))
  >  (let* ((mdata ...) (pure-p ...) (p ...) (q ...) ov) (when (and ... ...) (cond ... ...) (hs-make-overlay p q ... ...)) (goto-char (if end q ...)))
  >  (progn (let* (... ... ... ... ov) (when ... ... ...) (goto-char ...)))
  >  (if (looking-at hs-block-start-regexp) (progn (let* ... ... ...)))
  >  (when (looking-at hs-block-start-regexp) (let* (... ... ... ... ov) (when ... ... ...) (goto-char ...)))
  >  (if comment-reg (hs-hide-comment-region (car comment-reg) (cadr comment-reg) end) (when (looking-at hs-block-start-regexp) (let* ... ... ...)))
  >  hs-hide-block-at-point(t)
  >  (if (> arg 1) (hs-hide-level-recursive (1- arg) minp maxp) (goto-char (match-beginning hs-block-start-mdata-select)) (hs-hide-block-at-point t))
  >  (while (progn (forward-comment ...) (and ... ...)) (if (> arg 1) (hs-hide-level-recursive ... minp maxp) (goto-char ...) (hs-hide-block-at-point t)))
  >  hs-hide-level-recursive(1 1 156)
  >  (save-excursion (message "Hiding blocks ...") (hs-hide-level-recursive arg (point-min) (point-max)) (message "Hiding blocks ... done"))
  >  (let ((inhibit-point-motion-hooks t) (case-fold-search t)) (save-excursion (message "Hiding blocks ...") (hs-hide-level-recursive arg ... ...) (message "Hiding blocks ... done")) (run-hooks (quote hs-hide-hook)))
  >  (progn (let (... ...) (save-excursion ... ... ...) (run-hooks ...)))
  >  (if hs-minor-mode (progn (let ... ... ...)))
  >  (when hs-minor-mode (let (... ...) (save-excursion ... ... ...) (run-hooks ...)))
  >  (hs-life-goes-on (save-excursion (message "Hiding blocks ...") (hs-hide-level-recursive arg ... ...) (message "Hiding blocks ... done")) (run-hooks (quote hs-hide-hook)))
  >  hs-hide-level(1)
  >  eval((hs-hide-level 1))
  >  eval-expression((hs-hide-level 1) nil)
  >  call-interactively(eval-expression)
  >  execute-extended-command(nil)
  >  call-interactively(execute-extended-command)
  > 
  > 
  > -- 
  > With best regards
  > Dmitry Bolshakov
  > #!/usr/bin/perl
  > 
  > use strict;
  > 
  > # left brace inside comments { cause error
  > sub blabla {
  > 	for (my $i = 0; $i < 10; $i++) {
  > 		printf("\$i is %d\n", $i);
  > 	}
  > }