GNU bug report logs - #15975
24.3.50; Arithmetic error upon calling `python-indent-line` in a buffer of a single non-empty line.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: James De Ricco <jcdericco <at> optonline.net>
Subject: bug#15975: closed (Re: bug#15975: 24.3.50; Arithmetic error upon
 calling `python-indent-line` in a buffer of a single non-empty line.)
Date: Tue, 26 Nov 2013 03:17:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#15975: 24.3.50; Arithmetic error upon calling `python-indent-line` in a buffer of a single non-empty line.

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 15975 <at> debbugs.gnu.org.

-- 
15975: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15975
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Glenn Morris <rgm <at> gnu.org>
To: 15975-done <at> debbugs.gnu.org
Subject: Re: bug#15975: 24.3.50;
 Arithmetic error upon calling `python-indent-line` in a buffer of a
 single non-empty line.
Date: Mon, 25 Nov 2013 22:16:21 -0500

Version: 24.4

Thanks; fixed.

[Message part 3 (message/rfc822, inline)]

From: James De Ricco <jcdericco <at> optonline.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Arithmetic error upon calling `python-indent-line` in a
 buffer of a single non-empty line.
Date: Mon, 25 Nov 2013 15:49:58 -0500

An Arithmetic error is raised when the `python-indent-line` function is
called on a buffer consisting of one non-empty line.

cd src/emacs-bzr/install-prefix/bin/
./emacs -Q
C-x b pybuf <RET> def main(): M-x python-mode <RET> C-j

*Messages* buffer:
  For information about GNU Emacs and the GNU system, type C-h C-a.
  python-indent-line: Arithmetic error

*Backtrace* buffer:
  Debugger entered--Lisp error: (arith-error)
    python-indent-calculate-levels()
    python-indent-line()
    python-indent-line-function()
    indent-according-to-mode()
    newline-and-indent()
    call-interactively(newline-and-indent nil nil)
    command-execute(newline-and-indent)

The patch below resolves the problem by ensuring that the function
`python-indent-guess-indent-offset` does not set `python-indent-offset`
to zero, thereby violating the precondition of the function
`python-indent-calculate-levels` which expects `python-indent-offset` to
not equal zero (otherwise attempts to modulus a number and zero). It
makes sense that `python-indent-offset` would never equal zero since the
python language requires non-zero level indentation of blocks.

*** python.el.original  2013-11-25 14:48:53.118763386 -0500
--- python.el   2013-11-25 14:49:32.601625243 -0500
***************
*** 676,682 ****
                   (goto-char block-end)
                   (python-util-forward-comment)
                   (current-indentation))))
!           (if indentation
                (set (make-local-variable 'python-indent-offset)
indentation)
              (message "Can't guess python-indent-offset, using
defaults: %s"
                       python-indent-offset)))))))
--- 676,682 ----
                   (goto-char block-end)
                   (python-util-forward-comment)
                   (current-indentation))))
!           (if (> indentation 0)
                (set (make-local-variable 'python-indent-offset)
indentation)
              (message "Can't guess python-indent-offset, using
defaults: %s"
                       python-indent-offset)))))))


In GNU Emacs 24.3.50.3 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll
bars)
 of 2013-11-25 on jcdericco-MacBookPro-GNU
Bzr revision: 115235 bozhidar <at> batsov.com-20131125190450-w5yaffnkd8ti4o5z
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:    Trisquel 6.0

Configured using:
 `configure --prefix=/home/jcdericco/src/emacs-bzr/install-prefix/'

Load-path shadows:
None found.

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