Re: Folding on markdown headers

On May 25, 2012, at 3:08 PM, Chris Jones wrote:

> On Tue, May 22, 2012 at 09:14:03AM EDT, Eric Weir wrote:
>
>>> On May 20, 2012, at 12:20 AM, Chris Jones wrote:
>>>
>>> What folding method are you using..?
>>
>> At first I didn't know how to answer. I didn't find anything related
>> to fold method in my .vimrc. Fortunately, I keep copies of emails
>> pertaining to problems I've encountered and solved with the help of
>> people here and at vim_mac. Thank God!
>>
>> Turns out I'm using Vlad Irnov's markdown folding script.
>> https://gist.github.com/1035030 I'd completely forgotten about it, but
>> it is what takes care of it for me.
>
> I meant the value of the 'foldmethod' Vim option. What does ':set fdm?'
> tell you?

Thanks, Chris. It depends on the filetype. If it's markdown the result is "foldmethod=expr." Otherwise "foldmethod=manual."

> The script sets the fdm option to 'expr' for the current buffer/window,
> which amounts to running user-written code for each line in the buffer.
>
> In this particular case, the user-written code is a function named
> 'Foldexpr_markdown()'. By the look of it, this function should create
> a fold automatically wherever it sees a line that starts with an equal
> sign in column one, followed by either an equal sign or white space.
> A valid markdown header would be something such as '= a header'.. or
> '=== another header'... etc.
>
> So that if you if you add a line of the form: '= this is a header' and
> hit <Enter>, the script should run automatically and create a fold
> immediately. At least that's the way I understand it.

There are two types of markdown headers, Setext and atx. Setext uses equal sign or single underline underlining. atx uses hashmarks, #, ##, etc. I use the latter and the script folds on them fine.

>> Maybe this is something Vlad overlooked? Whatever, the workaround is
>> pretty simple, so thanks again for that.
>
> I use a one-line expression to fold Vim help files that is quite similar
> to the script you referred me to and it updates the folding immediately
> when for instance I duplicate the first couple of lines of an existing
> fold by copying and pasting it - I never have to reload the file.
>
> At a glance I cannot see any particular reason why the above-mentioned
> script shouldn't work the same.

Not a programmer. Since the script controls folding on markdown files I would look to it for an explanation. My guess about what's going on when a script or plugin seems not to be working as it should is often completely wrong.

> What exactly do you mean by 'when I create a file'..? How does it 'not
> work'?

I start with an empty window, i.e., no file loaded. I type in a "#" and some text, do a <CR> and some more text, another <CR> and some more text, then write/save the file as a markdown file, i.e., with markdown extent. At that point the header is not highlighted and folding does not work. If I close the file and reopen it, highlighting and folding work.

Regards,
------------------------------------------------------------------------------------------
Eric Weir
1111 Clairemont Avenue J3 ~ Decatur, GA 30030
404-636-6142 ~ eeweir@bellsouth.net

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