build: drop std::filesystem checks

The `<experimental/filesystem>` and `-lc++experimental` aren't needed
since LLVM 9.0. And since we now require C++20, checking for the
`<filesystem>` support shouldn't be necessary either.

include/factory.hpp

@@ -33,7 +33,7 @@
 #include "modules/hyprland/window.hpp"
 #include "modules/hyprland/workspaces.hpp"
 #endif
-#if defined(__FreeBSD__) || (defined(__linux__) && !defined(NO_FILESYSTEM))
+#if defined(__FreeBSD__) || defined(__linux__)
 #include "modules/battery.hpp"
 #endif
 #if defined(HAVE_CPU_LINUX) || defined(HAVE_CPU_BSD)

include/modules/battery.hpp

@@ -1,11 +1,8 @@
 #pragma once
 
-#ifdef FILESYSTEM_EXPERIMENTAL
-#include <experimental/filesystem>
-#else
-#include <filesystem>
-#endif
 #include <fmt/format.h>
+
+#include <filesystem>
 #if defined(__linux__)
 #include <sys/inotify.h>
 #endif
@@ -21,11 +18,7 @@
 
 namespace waybar::modules {
 
-#ifdef FILESYSTEM_EXPERIMENTAL
-namespace fs = std::experimental::filesystem;
-#else
 namespace fs = std::filesystem;
-#endif
 
 class Battery : public ALabel {
  public:

meson.build

@@ -22,8 +22,6 @@ endif
 
 if compiler.has_link_argument('-lc++fs')
     cpp_link_args += ['-lc++fs']
-elif compiler.has_link_argument('-lc++experimental')
-    cpp_link_args += ['-lc++experimental']
 elif compiler.has_link_argument('-lstdc++fs')
     cpp_link_args += ['-lstdc++fs']
 endif
@@ -44,15 +42,6 @@ else
     endif
 endif
 
-if not compiler.has_header('filesystem')
-    if compiler.has_header('experimental/filesystem')
-        add_project_arguments('-DFILESYSTEM_EXPERIMENTAL', language: 'cpp')
-    else
-        add_project_arguments('-DNO_FILESYSTEM', language: 'cpp')
-        warning('No filesystem header found, some modules may not work')
-    endif
-endif
-
 code = '''
 #include <langinfo.h>
 #include <locale.h>

src/factory.cpp

@@ -16,7 +16,7 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name,
     auto hash_pos = name.find('#');
     auto ref = name.substr(0, hash_pos);
     auto id = hash_pos != std::string::npos ? name.substr(hash_pos + 1) : "";
-#if defined(__FreeBSD__) || (defined(__linux__) && !defined(NO_FILESYSTEM))
+#if defined(__FreeBSD__) || defined(__linux__)
     if (ref == "battery") {
       return new waybar::modules::Battery(id, bar_, config_[name]);
     }