add .vimrc and src/.ycm_extra_conf.py

contrib/YouCompleteMe/README.md

@@ -0,0 +1,15 @@
+# YouCompleteMe
+
+## Installation
+
+### Step 1
+
+Install [YouCompleteMe](https://github.com/Valloric/YouCompleteMe).
+
+### Step 2
+
+```bash
+cp ycm_extra_conf.py ../../src/.ycm_extra_conf.py
+echo src/.ycm_extra_conf.py >> ../../.git/info/exclude
+make -C ../.. cmake
+```

contrib/YouCompleteMe/ycm_extra_conf.py

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+# .ycm_extra_conf.py for nvim source code.
+import os, ycm_core
+
+
+def DirectoryOfThisScript():
+    return os.path.dirname(os.path.abspath(__file__))
+
+
+def GetDatabase():
+    compilation_database_folder = DirectoryOfThisScript() + '/../build'
+    if os.path.exists(compilation_database_folder):
+        return ycm_core.CompilationDatabase(compilation_database_folder)
+    return None
+
+
+def IsHeaderFile(filename):
+    extension = os.path.splitext(filename)[1]
+    return extension == '.h'
+
+
+def GetCompilationInfoForFile(filename):
+    database = GetDatabase()
+    if not database:
+        return None
+    if IsHeaderFile(filename):
+        basename = os.path.splitext(filename)[0]
+        replacement_file = basename + '.c'
+        if os.path.exists(replacement_file):
+            compilation_info = database.GetCompilationInfoForFile(replacement_file)
+            if compilation_info.compiler_flags_:
+                return compilation_info
+        return None
+    return database.GetCompilationInfoForFile(filename)
+
+
+def FlagsForFile(filename):
+    compilation_info = GetCompilationInfoForFile(filename)
+    if not compilation_info:
+        return None
+    return {
+        'flags': compilation_info.compiler_flags_,
+        'do_cache': True
+    }

contrib/vim-addon-local-vimrc/README.md

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+# vim-addon-local-vimrc
+
+## Installation
+
+### Step 1
+
+Install [vim-addon-local-vimrc](https://github.com/MarcWeber/vim-addon-local-vimrc).
+For example with [Vundle](https://github.com/MarcWeber/vim-addon-local-vimrc):
+```vim
+Bundle 'MarcWeber/vim-addon-local-vimrc'
+```
+
+### Step 2
+
+```bash
+cp vimrc ../../.vimrc
+echo .vimrc >> ../../.git/info/exclude
+```

contrib/vim-addon-local-vimrc/vimrc

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+set modelines=0
+
+augroup LOCAL_SETUP
+  autocmd!
+  autocmd BufRead,BufNewFile *.h set filetype=c
+  autocmd FileType c setlocal expandtab
+  autocmd FileType c setlocal shiftwidth=2
+  autocmd FileType c setlocal softtabstop=2
+  autocmd FileType c setlocal textwidth=80
+  autocmd FileType c setlocal comments=:///,://
+augroup end