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.vim/autoload/xolox/misc/list.vim

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+" List handling functions.
+"
+" Author: Peter Odding <peter@peterodding.com>
+" Last Change: June 2, 2013
+" URL: http://peterodding.com/code/vim/misc/
+
+function! xolox#misc#list#unique(list) " {{{1
+  " Remove duplicate values from the given list in-place (preserves order).
+  call reverse(a:list)
+  call filter(a:list, 'count(a:list, v:val) == 1')
+  return reverse(a:list)
+endfunction
+
+function! xolox#misc#list#binsert(list, value, ...) " {{{1
+  " Performs in-place binary insertion, which depending on your use case can
+  " be more efficient than calling Vim's [sort()] [sort] function after each
+  " insertion (in cases where a single, final sort is not an option). Expects
+  " three arguments:
+  "
+  " 1. A list
+  " 2. A value to insert
+  " 3. 1 (true) when case should be ignored, 0 (false) otherwise
+  "
+  " [sort]: http://vimdoc.sourceforge.net/htmldoc/eval.html#sort()
+  let idx = s:binsert_r(a:list, 0, len(a:list), a:value, exists('a:1') && a:1)
+  return insert(a:list, a:value, idx)
+endfunction
+
+function! s:binsert_r(list, low, high, value, ignorecase)
+  let mid = a:low + (a:high - a:low) / 2
+  if a:low == a:high
+    return a:low
+  elseif a:ignorecase ? a:value >? a:list[mid] : a:value > a:list[mid]
+    return s:binsert_r(a:list, mid + 1, a:high, a:value, a:ignorecase)
+  elseif a:ignorecase ? a:value <? a:list[mid] : a:value < a:list[mid]
+    return s:binsert_r(a:list, a:low, mid, a:value, a:ignorecase)
+  else
+    return mid
+  endif
+endfunction
+
+" vim: ts=2 sw=2 et