" GAP indent file
" Language: GAP (https://www.gap-system.org)
" Maintainer: Frank Lübeck (Frank.Luebeck@Math.RWTH-Aachen.De)
" Comments:
" -- started from Matlab indent file in vim 6.0
" -- Many people like a 4 blank indentation, I prefer 2 blanks: this can
" be adjusted by setting `GAPIndentShift' to 4, 2 (default) or whatever
" you like
" TODO: nice handling of `continuation' lines
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
" Some preliminary setting
setlocal nolisp " Make sure lisp indenting doesn't supersede us
setlocal autoindent
setlocal indentexpr=GetGAPIndent(v:lnum)
setlocal indentkeys=o,O=end,=fi,=else,=elif,=od,=\)
let GAPIndentShift = 2
" Only define the function once.
if exists("*GetGAPIndent")
finish
endif
" this function computes for line lnum of the current buffer the number of
" blanks for the indentation
function! GetGAPIndent(lnum)
" Give up if this line is explicitly joined.
if getline(a:lnum - 1) =~ '\\$'
return -1
endif
" Search backwards for the first non-empty line.
let plnum = a:lnum - 1
while plnum > 0 && getline(plnum) =~ '^\s*$'
let plnum = plnum - 1
endwhile
if plnum == 0
" This is the first non-empty line, use zero indent.
return 0
endif
let curind = indent(plnum)
" If the current line is a stop-block statement...
if getline(v:lnum) =~ '^\s*\(end\|else\|elif\|fi\|od\|until\)\>'
" See if this line does not follow the line right after an openblock
if getline(plnum) =~ '^\s*\(for\|if\|then\|else\|elif\|while\|repeat\)\>'
" See if the user has already dedented
elseif indent(v:lnum) > curind - g:GAPIndentShift
" If not, recommend one dedent
let curind = curind - g:GAPIndentShift
else
" Otherwise, trust the user
return -1
endif
" If the previous line opened a block
elseif (getline(plnum) =~ '^\s*\(for\|if\|then\|else\|elif\|while\|repeat\)\>' || getline(plnum) =~ '\<function\> *(')
" See if the user has already indented, or if block is also finished
" im plnum
if (indent(v:lnum) < curind + g:GAPIndentShift && getline(plnum) !~ '\<\(end\|fi\|od\)\>')
"If not, recommend indent
let curind = curind + g:GAPIndentShift
else
" Otherwise, trust the user
return -1
endif
" Handle assignments over several lines
elseif (getline(plnum) =~ '^\s*[a-zA-Z0-9]*\s*:=[^;]*$')
let curind = match(getline(plnum), ':=') + 3
" Handle continuing function calls over several lines
elseif (getline(plnum) =~ '^\s*[a-zA-Z0-9]*\s*([^;]*$')
let curind = indent(plnum) + 2*GAPIndentShift;
endif
" If we got to here, it means that the user takes the standard version,
" so we return it
return curind
endfunction
" vim:sw=2
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