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" Vim indent file
" Language: Python
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Original Author: David Bustos <bustos@caltech.edu>
" Last Change: 2013 Jul 9
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
" Some preliminary settings
setlocal nolisp " Make sure lisp indenting doesn't supersede us
setlocal autoindent " indentexpr isn't much help otherwise
setlocal indentexpr=GetPythonIndent(v:lnum)
setlocal indentkeys+=<:>,=elif,=except
" Only define the function once.
if exists("*GetPythonIndent")
finish
endif
let s:keepcpo= &cpo
set cpo&vim
" Come here when loading the script the first time.
let s:maxoff = 50 " maximum number of lines to look backwards for ()
function GetPythonIndent(lnum)
" 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) + (exists("g:pyindent_continue") ? eval(g:pyindent_continue) : (shiftwidth() * 2))
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 the previous line is inside parenthesis, use the indent of the starting
" line.
" Trick: use the non-existing "dummy" variable to break out of the loop when
" going too far back.
call cursor(plnum, 1)
let parlnum = searchpair('(\|{\|\[', '', ')\|}\|\]', 'nbW',
\ "line('.') < " . (plnum - s:maxoff) . " ? dummy :"
\ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
\ . " =~ '\\(Comment\\|Todo\\|String\\)$'")
if parlnum > 0
let plindent = indent(parlnum)
let plnumstart = parlnum
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 = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
\ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
\ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
\ . " =~ '\\(Comment\\|Todo\\|String\\)$'")
if p > 0
if p == plnum
" When the start is inside parenthesis, only indent one 'shiftwidth'.
let pp = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
\ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
\ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
\ . " =~ '\\(Comment\\|Todo\\|String\\)$'")
if pp > 0
return indent(plnum) + (exists("g:pyindent_nested_paren") ? eval(g:pyindent_nested_paren) : shiftwidth())
endif
return indent(plnum) + (exists("g:pyindent_open_paren") ? eval(g:pyindent_open_paren) : (shiftwidth() * 2))
endif
if plnumstart == p
return indent(plnum)
endif
return plindent
endif
" Get the line and remove a trailing comment.
" Use syntax highlighting attributes when possible.
let pline = getline(plnum)
let pline_len = strlen(pline)
if has('syntax_items')
" If the last character in the line is a comment, do a binary search for
" the start of the comment. synID() is slow, a linear search would take
" too long on a long line.
if synIDattr(synID(plnum, pline_len, 1), "name") =~ "\\(Comment\\|Todo\\)$"
let min = 1
let max = pline_len
while min < max
let col = (min + max) / 2
if synIDattr(synID(plnum, col, 1), "name") =~ "\\(Comment\\|Todo\\)$"
let max = col
else
let min = col + 1
endif
endwhile
let pline = strpart(pline, 0, min - 1)
endif
else
let col = 0
while col < pline_len
if pline[col] == '#'
let pline = strpart(pline, 0, col)
break
endif
let col = col + 1
endwhile
endif
" If the previous line ended with a colon, indent this line
if pline =~ ':\s*$'
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 indent(a:lnum) > indent(plnum) - shiftwidth()
" If not, recommend one dedent
return indent(plnum) - shiftwidth()
endif
" Otherwise, trust the user
return -1
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*\(for\|if\|try\)\>'
return plindent
endif
" Or the user has already dedented
if indent(a:lnum) <= plindent - shiftwidth()
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
return plindent
endif
return -1
endfunction
let &cpo = s:keepcpo
unlet s:keepcpo
" vim:sw=2