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python.vim
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" Support for Python indenting, see runtime/indent/python.vim let s:keepcpo= &cpo set cpo&vim " need to inspect some old g:pyindent_* variables to be backward compatible let g:python_indent = extend(get(g:, 'python_indent', {}), #{ \ closed_paren_align_last_line: v:true, \ open_paren: get(g:, 'pyindent_open_paren', 'shiftwidth() * 2'), \ nested_paren: get(g:, 'pyindent_nested_paren', 'shiftwidth()'), \ continue: get(g:, 'pyindent_continue', 'shiftwidth() * 2'), "\ searchpair() can be slow, limit the time to 150 msec or what is put in "\ g:python_indent.searchpair_timeout \ searchpair_timeout: get(g:, 'pyindent_searchpair_timeout', 150), "\ Identing inside parentheses can be very slow, regardless of the searchpair() "\ timeout, so let the user disable this feature if he doesn't need it \ disable_parentheses_indenting: get(g:, 'pyindent_disable_parentheses_indenting', v:false), \ }, 'keep') let s:maxoff = 50 " maximum number of lines to look backwards for () function s:SearchBracket(fromlnum, flags) return searchpairpos('[[({]', '', '[])}]', a:flags, \ {-> synstack('.', col('.')) \ ->indexof({_, id -> synIDattr(id, 'name') =~ '\%(Comment\|Todo\|String\)$'}) >= 0}, \ [0, a:fromlnum - s:maxoff]->max(), g:python_indent.searchpair_timeout) endfunction " See if the specified line is already user-dedented from the expected value. function s:Dedented(lnum, expected) return indent(a:lnum) <= a:expected - shiftwidth() endfunction " Some other filetypes which embed Python have slightly different indent " rules (e.g. bitbake). Those filetypes can pass an extra funcref to this " function which is evaluated below. function python#GetIndent(lnum, ...) let ExtraFunc = a:0 > 0 ? a:1 : 0 " If this line is explicitly joined: If the previous line was also joined, " line it up with that one, otherwise add two 'shiftwidth' if getline(a:lnum - 1) =~ '\\$' if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$' return indent(a:lnum - 1) endif return indent(a:lnum - 1) + get(g:, 'pyindent_continue', g:python_indent.continue)->eval() endif " If the start of the line is in a string don't change the indent. if has('syntax_items') \ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$" return -1 endif " Search backwards for the previous non-empty line. let plnum = prevnonblank(v:lnum - 1) if plnum == 0 " This is the first non-empty line, use zero indent. return 0 endif if g:python_indent.disable_parentheses_indenting == 1 let plindent = indent(plnum) let plnumstart = plnum else " Indent inside parens. " Align with the open paren unless it is at the end of the line. " E.g. " open_paren_not_at_EOL(100, " (200, " 300), " 400) " open_paren_at_EOL( " 100, 200, 300, 400) call cursor(a:lnum, 1) let [parlnum, parcol] = s:SearchBracket(a:lnum, 'nbW') if parlnum > 0 if parcol != col([parlnum, '$']) - 1 return parcol elseif getline(a:lnum) =~ '^\s*[])}]' && !g:python_indent.closed_paren_align_last_line return indent(parlnum) endif endif call cursor(plnum, 1) " If the previous line is inside parenthesis, use the indent of the starting " line. let [parlnum, _] = s:SearchBracket(plnum, 'nbW') if parlnum > 0 if a:0 > 0 && ExtraFunc(parlnum) " We may have found the opening brace of a bitbake Python task, e.g. 'python do_task {' " If so, ignore it here - it will be handled later. let parlnum = 0 let plindent = indent(plnum) let plnumstart = plnum else let plindent = indent(parlnum) let plnumstart = parlnum endif else let plindent = indent(plnum) let plnumstart = plnum endif " When inside parenthesis: If at the first line below the parenthesis add " two 'shiftwidth', otherwise same as previous line. " i = (a " + b " + c) call cursor(a:lnum, 1) let [p, _] = s:SearchBracket(a:lnum, 'bW') if p > 0 if a:0 > 0 && ExtraFunc(p) " Currently only used by bitbake " Handle first non-empty line inside a bitbake Python task if p == plnum return shiftwidth() endif " Handle the user actually trying to close a bitbake Python task let line = getline(a:lnum) if line =~ '^\s*}' return -2 endif " Otherwise ignore the brace let p = 0 else if p == plnum " When the start is inside parenthesis, only indent one 'shiftwidth'. let [pp, _] = s:SearchBracket(a:lnum, 'bW') if pp > 0 return indent(plnum) \ + get(g:, 'pyindent_nested_paren', g:python_indent.nested_paren)->eval() endif return indent(plnum) \ + get(g:, 'pyindent_open_paren', g:python_indent.open_paren)->eval() endif if plnumstart == p return indent(plnum) endif return plindent endif endif endif " Get the line and remove a trailing comment. " Use syntax highlighting attributes when possible. let pline = getline(plnum) let pline_len = strlen(pline) if has('syntax_items') " If the last character in the line is a comment, do a binary search for " the start of the comment. synID() is slow, a linear search would take " too long on a long line. if synstack(plnum, pline_len) \ ->indexof({_, id -> synIDattr(id, 'name') =~ '\%(Comment\|Todo\)$'}) >= 0 let min = 1 let max = pline_len while min < max let col = (min + max) / 2 if synstack(plnum, col) \ ->indexof({_, id -> synIDattr(id, 'name') =~ '\%(Comment\|Todo\)$'}) >= 0 let max = col else let min = col + 1 endif endwhile let pline = strpart(pline, 0, min - 1) endif else let col = 0 while col < pline_len if pline[col] == '#' let pline = strpart(pline, 0, col) break endif let col = col + 1 endwhile endif " If the previous line ended with a colon, indent this line if pline =~ ':\s*$' return plindent + shiftwidth() endif " If the previous line was a stop-execution statement... if getline(plnum) =~ '^\s*\(break\|continue\|raise\|return\|pass\)\>' " See if the user has already dedented if s:Dedented(a:lnum, indent(plnum)) " If so, trust the user return -1 endif " If not, recommend one dedent return indent(plnum) - shiftwidth() endif " If the current line begins with a keyword that lines up with "try" if getline(a:lnum) =~ '^\s*\(except\|finally\)\>' let lnum = a:lnum - 1 while lnum >= 1 if getline(lnum) =~ '^\s*\(try\|except\)\>' let ind = indent(lnum) if ind >= indent(a:lnum) return -1 " indent is already less than this endif return ind " line up with previous try or except endif let lnum = lnum - 1 endwhile return -1 " no matching "try"! endif " If the current line begins with a header keyword, dedent if getline(a:lnum) =~ '^\s*\(elif\|else\)\>' " Unless the previous line was a one-liner if getline(plnumstart) =~ '^\s*\(for\|if\|elif\|try\)\>' return plindent endif " Or the user has already dedented if s:Dedented(a:lnum, plindent) return -1 endif return plindent - shiftwidth() endif " When after a () construct we probably want to go back to the start line. " a = (b " + c) " here if parlnum > 0 " ...unless the user has already dedented if s:Dedented(a:lnum, plindent) return -1 else return plindent endif endif return -1 endfunction let &cpo = s:keepcpo unlet s:keepcpo