Add clangcheck Linter to cpp (#686)

Add a clangcheck linter

ale_linters/cpp/clangcheck.vim

@@ -0,0 +1,37 @@
+" Author: gagbo <gagbobada@gmail.com>
+" Description: clang-check linter for cpp files
+
+" Set this option to manually set some options for clang-check.
+let g:ale_cpp_clangcheck_options = get(g:, 'ale_cpp_clangcheck_options', '')
+
+" Set this option to manually point to the build directory for clang-tidy.
+" This will disable all the other clangtidy_options, since compilation
+" flags are contained in the json
+let g:ale_c_build_dir = get(g:, 'ale_c_build_dir', '')
+
+function! ale_linters#cpp#clangcheck#GetCommand(buffer) abort
+    let l:user_options = ale#Var(a:buffer, 'cpp_clangcheck_options')
+    let l:extra_options = !empty(l:user_options)
+    \   ? l:user_options
+    \   : ''
+
+    " Try to find compilation database to link automatically
+    let l:user_build_dir = ale#Var(a:buffer, 'c_build_dir')
+    if empty(l:user_build_dir)
+        let l:user_build_dir = ale#c#FindCompileCommands(a:buffer)
+    endif
+    let l:build_options = !empty(l:user_build_dir)
+    \   ? ' -p ' . ale#Escape(l:user_build_dir)
+    \   : ''
+
+    return 'clang-check -analyze ' . '%s' . l:extra_options . l:build_options
+endfunction
+
+call ale#linter#Define('cpp', {
+\   'name': 'clangcheck',
+\   'output_stream': 'stderr',
+\   'executable': 'clang-check',
+\   'command_callback': 'ale_linters#cpp#clangcheck#GetCommand',
+\   'callback': 'ale#handlers#gcc#HandleGCCFormat',
+\   'lint_file': 1,
+\})