Merge pull request #1751 from melentye/master

Add Clangd language server support for C

ale_linters/c/clangd.vim

@@ -0,0 +1,29 @@
+" Author: Andrey Melentyev <andrey.melentyev@protonmail.com>
+" Description: Clangd language server
+
+call ale#Set('c_clangd_executable', 'clangd')
+call ale#Set('c_clangd_options', '')
+
+function! ale_linters#c#clangd#GetProjectRoot(buffer) abort
+    let l:project_root = ale#path#FindNearestFile(a:buffer, 'compile_commands.json')
+    return !empty(l:project_root) ? fnamemodify(l:project_root, ':h') : ''
+endfunction
+
+function! ale_linters#c#clangd#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'c_clangd_executable')
+endfunction
+
+function! ale_linters#c#clangd#GetCommand(buffer) abort
+    let l:executable = ale_linters#c#clangd#GetExecutable(a:buffer)
+    let l:options = ale#Var(a:buffer, 'c_clangd_options')
+
+    return ale#Escape(l:executable) . (!empty(l:options) ? ' ' . l:options : '')
+endfunction
+
+call ale#linter#Define('c', {
+\   'name': 'clangd',
+\   'lsp': 'stdio',
+\   'executable_callback': 'ale_linters#c#clangd#GetExecutable',
+\   'command_callback': 'ale_linters#c#clangd#GetCommand',
+\   'project_root_callback': 'ale_linters#c#clangd#GetProjectRoot',
+\})