vim: add cmd to generate compiledb from AOSP logs

.vim/plugin/cscope_plus.vim

@@ -72,6 +72,15 @@ if has("cscope")
 		call GetCscopeDb(path)
 	endfunction
 	command! GenerateCscopeDb :call GenerateCscopeDb()
+	" Open out/verbose.log.gz then run this cmd. It should produce a compile_commands.json. This is for case when SOONG variable
+	" Does not work (see
+	" https://android.googlesource.com/platform/build/soong/+/HEAD/docs/compdb.md)
+	function! GenerateCompileDbFromAOSP()
+		let @a=""
+		%s/\[\d*\/\d*\] \/bin\/bash -c "\(.*\)"/\=setreg('A', submatch(1), 'V')/gn
+		call system("compiledb ", @a)
+	endfunction
+	command! GenerateCompileDbFromAOSP :call GenerateCompileDbFromAOSP()
 endif
 " Let autotags find all cscodepeDb
 "	LoadLocalCscopeDb