Tip #333: Syntax-based folding for c/c++/java

tip karma

Rating 19/10, Viewed by 2150

created:		September 23, 2002 18:32		complexity:		intermediate
author:		Kartik Agaram		as of Vim:		6.0

Here's a function to toggle the use of syntax-based folding for a c/c++/java file. It also handles folding markers. function! OutlineToggle() if (! exists ("b:outline_mode")) let b:outline_mode = 0 endif if (b:outline_mode == 0) syn region myFold start="{" end="}" transparent fold syn sync fromstart set foldmethod=syntax silent! exec "%s/{{{/<<</" silent! exec "%s/}}}/>>>/" let b:outline_mode = 1 else set foldmethod=marker silent! exec "%s/<<</{{{/" silent! exec "%s/>>>/}}}/" let b:outline_mode = 0 endif endfunction

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Additional Notes

[email protected], September 24, 2002 5:47

I took Kartik's implementation and played with it, then played with it some more and finally got it to work. The "syn region myFold start="{" end="}" transparent fold" method does not like to work when you have other syn groups for {,}. I found this annoying (as I like my colored Braces!) so I figured a pure marker method would work nearly (or just as) good, and it does at least for my uses. Hopefully everything works just did v0.03 and I have run out of time, enjoy! outlinetoggle.vim from my plugin dir>>> " vim:ff=unix ts=4 ss=4 " vim60:fdm=marker " \file outlinetoggle.vim " " \brief VIM-Tip #333: Syntax-based folding for c/c++/java " " \author author: Kartik Agaram as of Vim: 6.0 " \author Mangled by [email protected] " \date Tue, 24 Sep 2002 05:44 Pacific Daylight Time " \version $Id$ " Version: 0.03 " History: " [Feral:267/02@05:43] v0.03: " saves the old marker method now. " stoped trying to be clever (just do the command twice heh) " v0.02 " trys to be cleaver and start in the proper outline mode based on if it " finds a "{>>" in the file. "if exists("loaded_outlinetoggle") " finish "endif "let loaded_outlinetoggle = 1 " Tip #333: Syntax-based folding for c/c++/java " tip karma Rating 0/0, Viewed by 88 " "created: September 23, 2002 18:32 complexity: intermediate "author: Kartik Agaram as of Vim: 6.0 " "Here's a function to toggle the use of syntax-based folding for a c/c++/java file. It also handles folding markers. function! <SID>OutlineToggle() let OldLine = line(".") let OldCol = virtcol(".") if (! exists ("b:outline_mode")) let b:outline_mode = 0 let b:OldMarker = &foldmarker; " :echo confirm(b:OldMarker) " if search("{>>", 'w') == 0 " " no modifed marker found, must be normal marker mode " let b:outline_mode = 0 " else " let b:outline_mode = 1 " endif endif if (b:outline_mode == 0) let b:outline_mode = 1 " syn region myFold start="{" end="}" transparent fold " syn sync fromstart " set foldmethod=syntax " set foldmethod=indent set foldmethod=marker set foldmarker={,} silent! exec "%s/{{{/{<</" silent! exec "%s/}}}/}>>/" else let b:outline_mode = 0 set foldmethod=marker let &foldmarker;=b:OldMarker " set foldmarker={{{,}}} silent! exec "%s/{<</{{{/" silent! exec "%s/}>>/}}}/" endif execute "normal! ".OldLine."G" execute "normal! ".OldCol."|" unlet OldLine unlet OldCol execute "normal! zv" endfunction "***************************************************************** "* Commands "***************************************************************** :command! -nargs=0 OUTLINE call <SID>OutlineToggle() " "EOF <<<

Kartik Agaram, September 25, 2002 20:52

Nice. Not changing foldmethod is definitely more elegant.




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