add vim syntax

editors/vim/ftdetect/slige.vim

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+autocmd BufNewFile,BufRead *.slg setfiletype slige
+autocmd BufNewFile,BufRead *.slgbc setfiletype json

editors/vim/ftplugin/slige.vim

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+setlocal commentstring=//%s

editors/vim/indent/slige.vim

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+setlocal indentexpr=SligeIndent()
+
+function! SligeIndent()
+  let line = getline(v:lnum)
+  let previousNum = prevnonblank(v:lnum - 1)
+  let previous = getline(previousNum)
+
+  if previous =~ "(" && previous !~ ")" && (line !~ ")" || line !~ "%)")
+    return indent(previousNum) + &shiftwidth
+  elseif (line =~ ")" || line =~ "%)") && line !~ "("
+    return indent(previousNum) - &shiftwidth
+  elif previous =~ "{" && previous !~ "}" && (line !~ "}" || line !~ "%}")
+    return indent(previousNum) + &shiftwidth
+  elseif (line =~ "}" || line =~ "%}") && line !~ "{"
+    return indent(previousNum) - &shiftwidth
+  elif previous =~ "[" && previous !~ "]" && (line !~ "]" || line !~ "%]")
+    return indent(previousNum) + &shiftwidth
+  elseif (line =~ "]" || line =~ "%]") && line !~ "["
+    return indent(previousNum) - &shiftwidth
+  else
+    return indent(previousNum)
+  endif
+endfunction

editors/vim/syntax/slige.vim

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+" Vim syntax file
+" Language: Slige
+" Maintainer: SFJ
+" Latest Revision: 1 January 1984
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn keyword Keyword break return let fn loop if else struct import or and not
+syn keyword Special null
+syn keyword Type int string
+syn keyword Boolean true false
+
+syn match Operator '+'
+syn match Operator '-'
+syn match Operator '\*'
+syn match Operator '/'
+syn match Operator '='
+syn match Operator '=='
+syn match Operator '!='
+syn match Operator '<'
+syn match Operator '>'
+syn match Operator '<='
+syn match Operator '>='
+syn match Operator '\.'
+syn match Operator ':'
+syn match Operator '->'
+
+syn match Number '0'
+syn match Number '[1-9][0-9]*'
+syn match Number '0[0-7]\+'
+syn match Number '0x[0-9a-fA-F]\+'
+syn match Number '0b[01]\+'
+
+syn region String   start=+"+  skip=+\\"+  end=+"+
+
+syn keyword Todo contained TODO FIXME XXX NOTE
+syn match Comment "/\*.*\*/" contains=Todo
+syn match Comment "//.*$" contains=Todo
+
+syn match Function '[a-zA-Z_]\w*\ze('
+
+syn region sligeBlock start="{" end="}" transparent fold
+
+let b:current_syntax = "slige"