Added a cmake example

Configuration-Examples-and-Snippets.md

@@ -123,3 +123,31 @@ call airline#parts#define('linenr', {'function': 'MyLineNumber', 'accents': 'bol
 
 let g:airline_section_z = airline#section#create(['%3p%%: ', 'linenr', ':%3v'])
 ```
+## Integrate with CMake build system
+This example adds CMAKE_BUILD_TYPE and a custom defined cmake variable by peeking into the CMakeCache.txt
+```viml
+function! CMakeStat()
+  let l:cmake_build_dir = get(g:, 'cmake_build_dir', 'build')
+  let l:build_dir = finddir(l:cmake_build_dir, '.;')
+
+  let l:retstr = ""
+  if l:build_dir != ""
+      if filereadable(build_dir . '/CMakeCache.txt')
+          let cmcache = readfile(build_dir . '/CMakeCache.txt')
+          for line in cmcache
+              if line =~ "CMAKE_BUILD_TYPE"
+                  let value = reverse(split(line, '='))[0]
+                  let retstr = retstr . value . " "
+              elseif line =~ "RUN_TESTS"
+                  let value = reverse(split(line, '='))[0]
+                  let retstr = retstr . "T" . value . " "
+              endif
+          endfor
+      endif
+  endif
+  return substitute(retstr, '^\s*\(.\{-}\)\s*$', '\1', '')
+endfunction
+
+call airline#parts#define('cmake', {'function': 'CMakeStat'})
+let g:airline_section_b = airline#section#create_left(['cmake'])
+```