client: lib_linter: specify .clang-format location

This commit allows *custom* C++ plugins to be linted/formatted in the
same way as their repo counterparts (using the same repo rulesets).

Previously, when runing the linter, only *repo* C++ plugins would be
formatted. Since custom plugin formatting for both Bash and PHP are
already in place, this simply extends the feature to C++.

client/src/docker/lib/internal/dev-tools/lib_linter.bash

@@ -2,7 +2,7 @@
 
 # docker-finance | modern accounting for the power-user
 #
-# Copyright (C) 2021-2024 Aaron Fiore (Founder, Evergreen Crypto LLC)
+# Copyright (C) 2021-2025 Aaron Fiore (Founder, Evergreen Crypto LLC)
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -170,7 +170,12 @@ function lib_linter::__lint_cpp()
   local -r _path=("$@")
   local -r _exts=("hh" "cc" "cpp" "C")
 
-  local -r _clang_format="clang-format -i"
+  local _clang_file
+  _clang_file="$(find ${DOCKER_FINANCE_CLIENT_REPO} -name .clang-format)"
+  [ -z "$_clang_file" ] && lib_utils::die_fatal ".clang-format not found"
+  declare -r _clang_file
+
+  local -r _clang_format="clang-format -i --style=file:${_clang_file}"
   local -r _cpplint="cpplint --root=${DOCKER_FINANCE_CLIENT_REPO} --filter=-whitespace/braces,-whitespace/newline,-whitespace/line_length,-build/c++11 --headers=hh --extensions=hh,cc,cpp,C"
   local -r _cppcheck="cppcheck --enable=warning,style,performance,portability --inline-suppr --std=c++17"