Crude syntax-based prettification of CtrlPTag

[Cimbali]

Here's one attempt at making the CtrlPTag ouput palatable/readable. It's using simple syntax matching. See what it does in images:

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Probably something much more powerful could be done with a proper formatting function. Just split on tab characters, then you can unobfuscate the kind of tag, properly shorten paths, reorder the code as last element of the line, etc.
See also http://ctags.sourceforge.net/FORMAT

There is one syntax group (CtrlPTagDir) that is not really used right now but could be used to show only the basename of files.

[Cimbali]

Alright so I did some more work to improve this, parsing the tags to fix some problems and improve appearance. The downside is some processing time in the #init() function. If you want to have a look, here it is:

• without reordering: Gets the path to the source file which is relative to the tags file, and changes it to a path that is absolute, relative to home, or relative to cwd. This looks better & improves matching the selected tag in the taglist() output (about .5s for 10k C++ tags across 2 files)
• with reordering: This has all of the above but improves the overall output by ordering the fields in a meaningful order: start with the tag kind (1 char) then the actual tag, then meta data (which class etc.), then only file and line or code (about .9s for 10k C++ tags across 2 files)

I tried parsing the line (tag<tab>file<tab>command(;"(<tab>field)+)?, tag and file may not contain tabs) with:

• matchstr(),
• 2x stridx(..., "\t") + match(..., ';"\t'),
• split(..., "\t") + finding the fields with index(map(..., "v:val[-2:] == ';\"'"), 1),
• split(... "\t") + finding the fields with a loop.
  This is the current code and works the fastest afaict.