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" Vim indent file
" Language: Erlang
" Maintainer: Csaba Hoch <csaba.hoch@gmail.com>
" Contributor: Edwin Fine <efine145_nospam01 at usa dot net>
" Last Change: 2008 Mar 12
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=ErlangIndent()
setlocal indentkeys+==after,=end,=catch,=),=],=}
" Only define the functions once.
if exists("*ErlangIndent")
finish
endif
" The function go through the whole line, analyses it and sets the indentation
" (ind variable).
" l: the number of the line to be examined.
function s:ErlangIndentAtferLine(l)
let i = 0 " the index of the current character in the line
let length = strlen(a:l) " the length of the line
let ind = 0 " how much should be the difference between the indentation of
" the current line and the indentation of the next line?
" e.g. +1: the indentation of the next line should be equal to
" the indentation of the current line plus one shiftwidth
let lastFun = 0 " the last token was a 'fun'
let lastReceive = 0 " the last token was a 'receive'; needed for 'after'
let lastHashMark = 0 " the last token was a 'hashmark'
while 0<= i && i < length
" m: the next value of the i
if a:l[i] == '%'
break
elseif a:l[i] == '"'
let m = matchend(a:l,'"\%([^"\\]\|\\.\)*"',i)
let lastReceive = 0
elseif a:l[i] == "'"
let m = matchend(a:l,"'[^']*'",i)
let lastReceive = 0
elseif a:l[i] =~# "[a-z]"
let m = matchend(a:l,".[[:alnum:]_]*",i)
if lastFun
let ind = ind - 1
let lastFun = 0
let lastReceive = 0
elseif a:l[(i):(m-1)] =~# '^\%(case\|if\|try\)$'
let ind = ind + 1
elseif a:l[(i):(m-1)] =~# '^receive$'
let ind = ind + 1
let lastReceive = 1
elseif a:l[(i):(m-1)] =~# '^begin$'
let ind = ind + 2
let lastReceive = 0
elseif a:l[(i):(m-1)] =~# '^end$'
let ind = ind - 2
let lastReceive = 0
elseif a:l[(i):(m-1)] =~# '^after$'
if lastReceive == 0
let ind = ind - 1
else
let ind = ind + 0
end
let lastReceive = 0
elseif a:l[(i):(m-1)] =~# '^fun$'
let ind = ind + 1
let lastFun = 1
let lastReceive = 0
endif
elseif a:l[i] =~# "[A-Z_]"
let m = matchend(a:l,".[[:alnum:]_]*",i)
let lastReceive = 0
elseif a:l[i] == '$'
let m = i+2
let lastReceive = 0
elseif a:l[i] == "." && (i+1>=length || a:l[i+1]!~ "[0-9]")
let m = i+1
if lastHashMark
let lastHashMark = 0
else
let ind = ind - 1
end
let lastReceive = 0
elseif a:l[i] == '-' && (i+1<length && a:l[i+1]=='>')
let m = i+2
let ind = ind + 1
let lastReceive = 0
elseif a:l[i] == ';'
let m = i+1
let ind = ind - 1
let lastReceive = 0
elseif a:l[i] == '#'
let m = i+1
let lastHashMark = 1
elseif a:l[i] =~# '[({[]'
let m = i+1
let ind = ind + 1
let lastFun = 0
let lastReceive = 0
let lastHashMark = 0
elseif a:l[i] =~# '[)}\]]'
let m = i+1
let ind = ind - 1
let lastReceive = 0
else
let m = i+1
endif
let i = m
endwhile
return ind
endfunction
function s:FindPrevNonBlankNonComment(lnum)
let lnum = prevnonblank(a:lnum)
let line = getline(lnum)
" continue to search above if the current line begins with a '%'
while line =~# '^\s*%.*$'
let lnum = prevnonblank(lnum - 1)
if 0 == lnum
return 0
endif
let line = getline(lnum)
endwhile
return lnum
endfunction
function ErlangIndent()
" Find a non-blank line above the current line.
let lnum = prevnonblank(v:lnum - 1)
" Hit the start of the file, use zero indent.
if lnum == 0
return 0
endif
let prevline = getline(lnum)
let currline = getline(v:lnum)
let ind = indent(lnum) + &sw * s:ErlangIndentAtferLine(prevline)
" special cases:
if prevline =~# '^\s*\%(after\|end\)\>'
let ind = ind + 2*&sw
endif
if currline =~# '^\s*end\>'
let ind = ind - 2*&sw
endif
if currline =~# '^\s*after\>'
let plnum = s:FindPrevNonBlankNonComment(v:lnum-1)
if getline(plnum) =~# '^[^%]*\<receive\>\s*\%(%.*\)\=$'
let ind = ind - 1*&sw
" If the 'receive' is not in the same line as the 'after'
else
let ind = ind - 2*&sw
endif
endif
if prevline =~# '^\s*[)}\]]'
let ind = ind + 1*&sw
endif
if currline =~# '^\s*[)}\]]'
let ind = ind - 1*&sw
endif
if prevline =~# '^\s*\%(catch\)\s*\%(%\|$\)'
let ind = ind + 1*&sw
endif
if currline =~# '^\s*\%(catch\)\s*\%(%\|$\)'
let ind = ind - 1*&sw
endif
if ind<0
let ind = 0
endif
return ind
endfunction
" TODO:
"
" f() ->
" x("foo
" bar")
" ,
" bad_indent.
"
" fun
" init/0,
" bad_indent
"
" #rec
" .field,
" bad_indent
"
" case X of
" 1 when A; B ->
" bad_indent
|
