interesting. I just tried this in Distel and am able to step through it just
fine. I would think at some level Distel is using the Erlang debugger.
On Dec 4, 2009, at 1:48 PM, Filipe David Manana wrote:
> Hello,
> thanks for the suggestion Torbjörn, I had not yet the time to test it
> but it seems promising (I am mostly an Emacs user also). It's on my
> todo list now.
>
> I found the cause of the problem. When debugging using Erlang's
> debugger, he considers the Length variable used in the second case
> statement (attribution to #att.len) to be already bound. This is so
> because the previous case statement also uses a variable named Length
> in 2 of its branches.
>
> Just renaming the second one from Length to Length2
> (chouch_httpd_db.erl line 1045) avoids the badmatch error:
>
> [#att{
> name = FileName,
> type = case couch_httpd:header_value(Req,"Content-Type") of
> undefined ->
> % We could throw an error here or guess by the
> FileName.
> % Currently, just giving it a default.
> <<"application/octet-stream">>;
> CType ->
> list_to_binary(CType)
> end,
> data = case couch_httpd:body_length(Req) of
> undefined ->
> <<"">>;
> {unknown_transfer_encoding, Unknown} ->
> exit({unknown_transfer_encoding, Unknown});
> chunked ->
> fun(MaxChunkSize, ChunkFun, InitState) ->
> couch_httpd:recv_chunked(Req, MaxChunkSize,
> ChunkFun, InitState)
> end;
> 0 ->
> <<"">>;
> Length when is_integer(Length) ->
> fun() -> couch_httpd:recv(Req, 0) end;
> Length ->
> exit({length_not_integer, Length})
> end,
> len = case couch_httpd:header_value(Req,"Content-Length") of
> undefined ->
> undefined;
> Length2 ->
> list_to_integer(Length2)
> end
> }]
> end,
>
> I wonder why this badmatch error only occurs when interpreting the
> code with the debugger and not during normal execution.
> Anyone has a clue?
>
> cheers
>
> 2009/12/2 Torbjörn Törnkvist <[email protected]>:
>> For some more light weight debugging I can recomend redbug. It is included
>> in the eper repo at google code.
>>
>> --Tobbe
>>
>> Den 12 1, 2009 11:50 PM, "Robert Dionne" <[email protected]>
>> skrev:
>>
>> I've had great luck using Distel[1] on top of aquamacs. Bill Clementson
>> wrote a couple of nice how to pieces[2] to get you started. Works like a
>> champ
>>
>> [1] http://github.com/bdionne/distel
>> [2] http://bc.tech.coop/blog/070528.html
>>
>> On Dec 1, 2009, at 5:34 PM, Filipe David Manana wrote: > Hello, > > I am
>> having a strange sit...
>>
>
>
>
> --
> Filipe David Manana,
> [email protected]
> PGP key - http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xC569452B
>
> "Reasonable men adapt themselves to the world.
> Unreasonable men adapt the world to themselves.
> That's why all progress depends on unreasonable men."
