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Re: An instructive example of trace-function and some example of debugg
From: |
Icarus Sparry |
Subject: |
Re: An instructive example of trace-function and some example of debugging |
Date: |
Wed, 08 Dec 2010 15:13:37 -0000 |
On Sat, 12 Jun 2010 10:43:46 -0700, bolega wrote:
> On Jun 10, 1:27 pm, bolega <gnuist...@gmail.com> wrote:
>> An instructive example of trace-function and some example of debugging,
>> for example, some of the error that pops up in lower window of emacs
>> and how to read/interpret it. Alternatively, a link to some page or
>> elisp manual but I am sure an expert here would have a superior
>> instruction as many replies here have shown.
>>
>> Thanks
>> Bolega
>>
>> trace-function is an interactive autoloaded Lisp function in `trace'.
>> [Arg list not available until function definition is loaded.]
>>
>> Traces FUNCTION with trace output going to BUFFER. For every call of
>> FUNCTION Lisp-style trace messages that display argument
>> and return values will be inserted into BUFFER. This function generates
>> the
>> trace advice for FUNCTION and activates it together with any other
>> advice
>> there might be!! The trace BUFFER will popup whenever FUNCTION is
>> called.
>> Do not use this to trace functions that switch buffers or do any other
>> display oriented stuff, use `trace-function-background' instead.
>
> let me widen the newsgroups as there was no reply to this one in the
> first one.
>
> Sometimes, in emacs, error takes places and the mode gets nested inside
> many brackets.
>
> [(((.lisp...)))]
>
> above line recalling from memory
>
> what does it mean ? C-g does not get out of it.
>
> What to do ?
If you are seeing [[[lisp]]] then you are in a "recursive edit".
This is not an error, it is a feature! The most common way to get into it
is if you are doing a query-replace (M-% with standard bindings), and
type control-r. This allows you to make some edits and then continue the
query-replace.
The standard key binding to abort out of recursive edit is C-] (the [..]
in the mode line is supposed to help you remember this key sequence).