From 0961c1331693a25056e9b236d8a0ccefd323fb5c Mon Sep 17 00:00:00 2001
From: "Kenneth Benzie (Benie)" <benie@infektor.net>
Date: Wed, 14 Jul 2021 11:38:21 +0100
Subject: [PATCH] Use compdb to post-process compile_commands.json

When selecting a `:BuildDir` for the `clangd` LSP use `compdb` to
post-process the `compile_commands.json` to also include flags for
stand alone header files.
---
 .conduit.yaml      |  1 +
 autoload/build.vim | 20 +++++++++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/.conduit.yaml b/.conduit.yaml
index aa6bf1a..8504548 100644
--- a/.conduit.yaml
+++ b/.conduit.yaml
@@ -4,6 +4,7 @@
     - vim-vint
     - yamllint
     - cmakelint
+    - compdb
 - repo:
     - remote: https://github.com/k-takata/minpac.git
       location: ~/.vim/pack/minpac/opt/minpac
diff --git a/autoload/build.vim b/autoload/build.vim
index 10f5e20..769f1ea 100644
--- a/autoload/build.vim
+++ b/autoload/build.vim
@@ -28,6 +28,7 @@ function! build#dir(...) abort
         endfor
         let l:index = inputlist(l:choices)
         let l:dir = s:dirs[l:index - 1]
+        echomsg ' '.l:dir
       endif
     endif
   else
@@ -48,17 +49,30 @@ function! build#dir(...) abort
     endif
   endif
   if exists('l:dir')
-    " Set build directory and restart YouCompleteMe.
-    let $BUILD_DIR = getcwd().'/'.substitute(l:dir, '\/$', '', '')
+    " Set build directory.
+    let l:cwd = substitute(getcwd(), '\\', '\/', 'g')
+    let $BUILD_DIR = l:cwd.'/'.substitute(l:dir, '\/$', '', '')
+    if executable('compdb')
+      " Post-process compile_commands.json with compdb, adds header files to
+      " missing compile_commands.json for more accurate diagnostics.
+      let l:database_dir = l:cwd.'/.vim'
+      let l:compile_commands = l:database_dir.'/compile_commands.json'
+      call systemlist('compdb -p '.$BUILD_DIR.' list > '.l:compile_commands)
+    else
+      let l:database_dir = $BUILD_DIR
+    endif
+    " Read/create .vim/coc-settings.json
     let l:coc_settings = {}
     if isdirectory('.vim')
       let l:coc_settings = json_decode(join(readfile('.vim/coc-settings.json'), ''))
     else
       call mkdir('.vim')
     endif
-    let l:coc_settings['clangd.compilationDatabasePath'] = $BUILD_DIR
+    " Update .vim/coc-settings.json with new build directory.
+    let l:coc_settings['clangd.compilationDatabasePath'] = l:database_dir
     let l:coc_settings['cmake.lsp.buildDirectory'] = $BUILD_DIR
     call writefile([json_encode(l:coc_settings)], '.vim/coc-settings.json')
+    " Finally restart coc.nvim with new config.
     CocRestart
   endif
 endfunction