ref: 112eae89312e9ce9e55806d609f55efd3bac01f0
vim/ftplugin/python/folding.vim
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" Fold routines for python code, version 3.2 " Source: http://www.vim.org/scripts/script.php?script_id=2527 " Last Change: 2009 Feb 25 " Author: Jurjen Bos " Bug fixes and helpful comments: Grissiom, David Froger, Andrew McNabb " Principles: " - a def/class starts a fold " a line with indent less than the previous def/class ends a fold " empty lines and comment lines are linked to the previous fold " comment lines outside a def/class are never folded " other lines outside a def/class are folded together as a group " for algorithm, see bottom of script " - optionally, you can get empty lines between folds, see (***) " - another option is to ignore non-python files see (**) " - you can also modify the def/class check, " allowing for multiline def and class definitions see (*) " Note for vim 7 users: " Vim 6 line numbers always take 8 columns, while vim 7 has a numberwidth variable " you can change the 8 below to &numberwidth if you have vim 7, " this is only really useful when you plan to use more than 8 columns (i.e. never) " Note for masochists trying to read this: " I wanted to keep the functions short, so I replaced occurences of " if condition " statement " by " if condition | statement " wherever I found that useful " (*) " class definitions are supposed to ontain a colon on the same line. " function definitions are *not* required to have a colon, to allow for multiline defs. " I you disagree, use instead of the pattern '^\s*\(class\s.*:\|def\s\)' " to enforce : for defs: '^\s*\(class\|def\)\s.*:' " you'll have to do this in two places. let s:defpat = '^\s*\(@\|class\s.*:\|def\s\)' " (**) Ignore non-python files " Commented out because some python files are not recognized by Vim if &filetype != 'python' finish endif setlocal foldmethod=expr setlocal foldexpr=GetPythonFold(v:lnum) setlocal foldtext=PythonFoldText() function! PythonFoldText() " ignore decorators let fs = v:foldstart while getline(fs) =~ '^\s*@' | let fs = nextnonblank(fs + 1) endwhile let line = getline(fs) let nucolwidth = &fdc + &number * &numberwidth let windowwidth = winwidth(0) - nucolwidth - 3 let foldedlinecount = v:foldend - v:foldstart " expand tabs into spaces let onetab = strpart(' ', 0, &tabstop) let line = substitute(line, '\t', onetab, 'g') let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount)) let fillcharcount = windowwidth - len(line) - len(foldedlinecount) return line . '…' . repeat(" ",fillcharcount) . foldedlinecount . '…' . ' ' endfunction function! PythonFoldTextDocstrings() " ignore decorators let fs = v:foldstart while getline(fs) =~ '^\s*@' | let fs = nextnonblank(fs + 1) endwhile " add docstrings let line = getline(fs) if getline(fs + 1) =~ '^\s*"""' " Not sure which wrapping symbols I like yet. " «»≺≻⸮⸫ let line = line . " «" . getline(fs + 1) . "»" let line = substitute(line, '\s*"""', '', 'g') let line = substitute(line, '"""', '', 'g') endif let nucolwidth = &fdc + &number * &numberwidth let windowwidth = winwidth(0) - nucolwidth - 3 let foldedlinecount = v:foldend - v:foldstart " expand tabs into spaces let onetab = strpart(' ', 0, &tabstop) let line = substitute(line, '\t', onetab, 'g') let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount)) let fillcharcount = windowwidth - len(line) - len(foldedlinecount) return line . '…' . repeat(" ",fillcharcount) . foldedlinecount . '…' . ' ' endfunction function! GetBlockIndent(lnum) " Auxiliary function; determines the indent level of the surrounding def/class " "global" lines are level 0, first def &shiftwidth, and so on " scan backwards for class/def that is shallower or equal let ind = 100 let p = a:lnum+1 while indent(p) >= 0 let p = p - 1 " skip empty and comment lines if getline(p) =~ '^$\|^\s*#' | continue " zero-level regular line elseif indent(p) == 0 | return 0 " skip deeper or equal lines elseif indent(p) >= ind || getline(p) =~ '^$\|^\s*#' | continue " indent is strictly less at this point: check for def/class elseif getline(p) =~ s:defpat && getline(p) !~ '^\s*@' " level is one more than this def/class return indent(p) + &shiftwidth endif " shallower line that is neither class nor def: continue search at new level let ind = indent(p) endwhile "beginning of file return 0 endfunction " Clever debug code, use as: call PrintIfCount(n,"Line: ".a:lnum.", value: ".x) let s:counter=0 function! PrintIfCount(n,t) "Print text the nth time this function is called let s:counter = s:counter+1 if s:counter==a:n | echo a:t endif endfunction function! GetPythonFold(lnum) " Determine folding level in Python source (see "higher foldlevel theory" below) let line = getline(a:lnum) let ind = indent(a:lnum) " Case D***: class and def start a fold " If previous line is @, it is not the first if line =~ s:defpat && getline(prevnonblank(a:lnum-1)) !~ '^\s*@' " let's see if this range of 0 or more @'s end in a class/def let n = a:lnum while getline(n) =~ '^\s*@' | let n = nextnonblank(n + 1) endwhile " yes, we have a match: this is the first of a real def/class with decorators if getline(n) =~ s:defpat return ">".(ind/&shiftwidth+1) endif " Case E***: empty lines fold with previous " (***) change '=' to -1 if you want empty lines/comment out of a fold elseif line == '' && getline(a:lnum-1) == '' | return '-1' elseif line == '' && getline(a:lnum-1) != '' | return '=' endif " now we need the indent from previous let p = prevnonblank(a:lnum-1) while p>0 && getline(p) =~ '^\s*#' | let p = prevnonblank(p-1) endwhile let pind = indent(p) " If previous was definition: count as one level deeper if getline(p) =~ s:defpat && getline(prevnonblank(a:lnum - 1)) !~ '^\s*@' let pind = pind + &shiftwidth " if begin of file: take zero elseif p==0 | let pind = 0 endif " Case S*=* and C*=*: indent equal if ind>0 && ind==pind | return '=' " Case S*>* and C*>*: indent increase elseif ind>pind | return '=' " All cases with 0 indent elseif ind==0 " Case C*=0*: separate global code blocks if pind==0 && line =~ '^#' | return 0 " Case S*<0* and S*=0*: global code elseif line !~'^#' " Case S*<0*: new global statement if/while/for/try/with if 0<pind && line!~'^else\s*:\|^except.*:\|^elif.*:\|^finally\s*:' | return '>1' " Case S*=0*, after level 0 comment elseif 0==pind && getline(prevnonblank(a:lnum-1)) =~ '^\s*#' | return '>1' " Case S*=0*, other, stay 1 else | return '=' endif endif " Case C*<0= and C*<0<: compute next indent let n = nextnonblank(a:lnum+1) while n>0 && getline(n) =~'^\s*#' | let n = nextnonblank(n+1) endwhile " Case C*<0=: split definitions if indent(n)==0 | return 0 " Case C*<0<: shallow comment else | return -1 end endif " now we really need to compute the actual fold indent " do the hard computation let blockindent = GetBlockIndent(a:lnum) " Case SG<* and CG<*: global code, level 1 if blockindent==0 | return 1 endif " now we need the indent from next let n = nextnonblank(a:lnum+1) while n>0 && getline(n) =~'^\s*#' | let n = nextnonblank(n+1) endwhile let nind = indent(n) " Case CR<= and CR<> "if line !~ '^\s*#' | call PrintIfCount(4,"Line: ".a:lnum.", blockindent: ".blockindent.", n: ".n.", nind: ".nind.", p: ".p.", pind: ".pind) endif if line =~ '^\s*#' && ind>=nind | return -1 " Case CR<<: return next indent elseif line =~ '^\s*#' | return nind / &shiftwidth " Case SR<*: return actual indent else | return blockindent / &shiftwidth endif endfunction " higher foldlevel theory " There are five kinds of statements: S (code), D (def/class), E (empty), C (comment) " Note that a decorator statement (beginning with @) counts as definition, " but that of a sequence of @,@,@,def only the first one counts " This means that a definiion only counts if not preceded by a decorator " There are two kinds of folds: R (regular), G (global statements) " There are five indent situations with respect to the previous non-emtpy non-comment line: " > (indent), < (dedent), = (same); < and = combine with 0 (indent is zero) " Note: if the previous line is class/def, its indent is interpreted as one higher " There are three indent situations with respect to the next (non-E non-C) line: " > (dedent), < (indent), = (same) " Situations (in order of the script): " stat fold prev next " SDEC RG ><=00 ><= " D * * * begin fold level if previous is not @: '>'.ind/&sw+1 " E * * * keep with previous: '=' " S * = * stays the same: '=' " C * = * combine with previous: '=' " S * > * stays the same: '=' " C * > * combine with previous: '=' " C * =0 * separate blocks: 0 " S * <0 * becomes new level 1: >1 (except except/else: 1) " S * =0 * stays 1: '=' (after level 0 comment: '>1') " C * <0 = split definitions: 0 " C * <0 < shallow comment: -1 " C * <0 > [never occurs] " S G < * global, not the first: 1 " C G < * indent isn't 0: 1 " C R < = foldlevel as computed for next line: -1 " C R < > foldlevel as computed for next line: -1 " S R < * compute foldlevel the hard way: use function " C R < < foldlevel as computed for this line: use function |