Add %wiki_path% template variable.

[HugoNikanor]

I needed a %wiki_path% variable for a git integration script I'm writing. I also thought that up-streaming it would be a good idea.

Recreated issue to point at different branch in my fork.

[EinfachToll]

Ok, this may be useful for some users. If you would add a remark about it to the "Placeholders" section of the doc, this would be even greater.

[HugoNikanor]

I added a short piece of documentation. See the second commit.

[HugoNikanor]

Ping. Will this be merged?

[hq6]

@HugoNikanor , I am a new maintainer and I'm interested in getting this merged.

It seems that all the other placeholder variables start with a % but do not end with a %. Is there a good reason for %wiki_path% to break this convention?

[HugoNikanor]

@hq6 As far as I can see the placeholder variables use two % characters in the HTML template file (default.tpl), and only a single leading % from inside the .wiki files.

[hq6]

@HugoNikanor , Since the Placeholders section of doc/vimwiki.txt that this PR touches is providing instructions for the .wiki files, should it have only a leading %?
That is, this section tells the user how to specify placeholders in the wiki file and not in tpl files.

[hq6]

Sorry I think I just realized why I was confused. If my new understanding is correct, %wiki_path% is only meant to be used in the HTML template files and never in the .wiki files. However, everything else in the Placeholders documentation is referring to directives placed inside wiki files.

Please correct me if my new understanding is wrong.

If I have understood this correctly, I think it would be more clear to document this in the description of vimwiki-option-template_path instead, as a section of "Additional Template Variables", and leave it out of Placeholders. I realize that @EinfachToll asked you to put it in Placeholders, but I hope both of you can understand why this might cause confusion.

@HugoNikanor, what are your thoughts on this?

[HugoNikanor]

@hq6. I agree with you on the confusion. I submitted a new commit which moves the documentation.