--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/runtime/indent/erlang.vim	Wed Aug 13 17:36:09 2008 +0900
@@ -0,0 +1,206 @@
+" 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
+