Compatibility Fix for insert-mode Tab mapping

plugin/clang_complete.vim

@@ -563,6 +563,11 @@ function! g:ClangUpdateQuickFix()
   return ''
 endfunction
 
+function g:InsertModeTabHelper()
+  python insertModeTab()
+  return s:insertModeTabTmp
+endfunction
+
 function! g:ClangGotoDeclaration()
   call s:GotoDeclaration(0)
   return ''

plugin/snippets/clang_complete.py

@@ -9,8 +9,16 @@ def snippetsInit():
     vim.command("syntax match placeHolderMark contained /\$`/ conceal")
     vim.command("syntax match placeHolderMark contained /`/ conceal")
 
+  # Check if there is a mapping for <tab> in insert mode (e.g. supertab)
+  vim.command("let oldmap=maparg(\"<tab>\", \"i\")")
+  oldmap = vim.eval("oldmap")
+
+  # and only use insert mode <tab> mapping if there is none
+  if (len(oldmap) == 0):
+    vim.command("inoremap <expr> <silent> <buffer> <tab> InsertModeTabHelper()")
+
 # The two following function are performance sensitive, do _nothing_
-# more that the strict necessary.
+# more than the strict necessary.
 
 def snippetsFormatPlaceHolder(word):
   return "$`%s`" % word
@@ -44,4 +52,29 @@ def updateSnips():
   isInclusive = vim.eval("&selection") == "inclusive"
   vim.command('call feedkeys("\<ESC>v%dl\<C-G>", "n")' % (end - start - isInclusive))
 
+def insertModeTab():
+  line = vim.current.line
+  row, col = vim.current.window.cursor
+
+  # look for argument completion strings (denoted by $` `)
+  r = re.compile('\$`[^`]*`')
+  result = r.search(line)
+
+  if result is None:
+    # if none found, perform a normal tab or jump to the end of the line
+    # if the symbol under the cursor is a closing bracket
+
+    # strange, we need +1 here if called as :python insertModeTab
+    # col = col + 1
+
+    # is the symbol under the cursor a closing bracket?
+    if col < len(line) and ( line[col] == ')' or line[col] == '>'):
+      # if so, jump to the end of the line
+      vim.command('let s:insertModeTabTmp="\<ESC>A"')
+    else:
+      vim.command('let s:insertModeTabTmp="\<TAB>"') 
+  else:
+    # line contains argument completion strings, perform a normal-mode tab
+    vim.command('call feedkeys("\<ESC>\<TAB>")')
+    vim.command('let s:insertModeTabTmp=""')
 # vim: set ts=2 sts=2 sw=2 expandtab :