From 821290599a15452d2604fc5b0a29b6b0aa1b0c07 Mon Sep 17 00:00:00 2001
From: jluehrs2 <jluehrs2@uiuc.edu>
Date: Sun, 20 Apr 2008 21:48:05 -0500
Subject: add nifty folding stuff

---
 vimrc | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/vimrc b/vimrc
index 8c3cd91..52a05e9 100644
--- a/vimrc
+++ b/vimrc
@@ -135,6 +135,9 @@ set cinoptions+=b1
 " Folding {{{
 " fold only when I ask for it damnit!
 set foldmethod=marker
+
+" use my custom fold display function (see bottom)
+set foldtext=Base_foldtext()
 "}}}
 "}}}
 
@@ -185,6 +188,9 @@ autocmd FileType perl setlocal keywordprg=perldoc\ -f
 " Latex :make converts to pdf {{{
 autocmd FileType tex setlocal makeprg=~/bin/latexpdf\ --show\ %
 " }}}
+" Set up custom folding {{{
+autocmd FileType tex set foldtext=Latex_foldtext()
+" }}}
 "}}}
 
 " Insert-mode remappings/abbreviations {{{
@@ -274,3 +280,52 @@ if file_readable(s:session_file) && expand("%:.") !~ '^/'
 endif
 " }}}
 " }}}
+
+" Folding {{{
+" Base {{{
+function Base_foldtext(...)
+    " if we're passed in a string, use that as the display, otherwise use the
+    " contents of the line at the start of the fold
+    if a:0 > 0
+        let line = a:1
+    else
+        let line = getline(v:foldstart)
+    endif
+
+    " remove the marker that caused this fold from the display
+    let foldmarkers = split(&foldmarker, ',')
+    let line = substitute(line, '\V\s\?' . foldmarkers[0] . '\s\?', ' ', '')
+
+    " remove any remaining leading or trailing whitespace
+    let line = substitute(line, '^\s*\(.\{-}\)\s*$', '\1', '')
+
+    " align everything, and pad the end of the display with -
+    let line = printf('%-' . (63 - v:foldlevel) . 's', line)
+    let line = substitute(line, '\%( \)\@<= \%( *$\)\@=', '-', 'g')
+
+    " format the line count
+    let nlines = printf('%12s',
+    \                   '(' . (v:foldend - v:foldstart + 1) . ' lines) ')
+
+    return '+-' . v:folddashes . ' ' . line . nlines
+endfunction
+" }}}
+" Latex {{{
+let s:latex_types = {'thm': 'Theorem', 'cor':  'Corollary',
+                   \ 'lem': 'Lemma',   'defn': 'Definition'}
+function Latex_foldtext()
+    let line = getline(v:foldstart)
+
+    " if we get the start of a theorem, format the display nicely
+    " XXX: allow the label to be on the following line
+    let matches = matchlist(line,
+    \                       '\\begin{\([^}]*\)}.*\\label{\([^}]*\)}')
+    if !empty(matches) && has_key(s:latex_types, matches[1])
+        return Base_foldtext(s:latex_types[matches[1]] . ": " . matches[2])
+    endif
+
+    " otherwise, just strip latex comments from the line
+    return Base_foldtext(substitute(line, '\s\?%\s\?', ' ', ''))
+endfunction
+" }}}
+" }}}
-- 
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