Use Rake DSL instead of commands of `FileUtils`

- Respect `--verbose(-v)` and `--dry-run(-n)` options.
- Silence warnings to keyword arguments on Ruby 2.7.

3 files changed, 5 insertions, 5 deletions

diff --git a/tasks/doc.rake b/tasks/doc.rake
index 4aec2d0a1..11b76bb3f 100644
--- a/tasks/doc.rake
+++ b/tasks/doc.rake
@@ -25,12 +25,12 @@ end
 
 desc 'clean all built docs'
 task :clean_api_doc do
-  FileUtils.rm_rf 'doc/api'
+  rm_rf 'doc/api'
 end
 
 desc 'clean all built docs'
 task :clean_capi_doc do
-  FileUtils.rm_rf 'doc/capi'
+  rm_rf 'doc/capi'
 end
 
 desc 'clean all built docs'
diff --git a/tasks/libmruby.rake b/tasks/libmruby.rake
index ab5a15b4a..17f8534e2 100644
--- a/tasks/libmruby.rake
+++ b/tasks/libmruby.rake
@@ -4,7 +4,7 @@ MRuby.each_target do
   end
 
   file "#{build_dir}/lib/libmruby.flags.mak" => [__FILE__, libmruby_static] do |t|
-    FileUtils.mkdir_p File.dirname t.name
+    mkdir_p File.dirname t.name
     open(t.name, 'w') do |f|
       f.puts "MRUBY_CFLAGS = #{cc.all_flags}"
 
diff --git a/tasks/mrbgems.rake b/tasks/mrbgems.rake
index fb76856e5..8168e4fab 100644
--- a/tasks/mrbgems.rake
+++ b/tasks/mrbgems.rake
@@ -8,7 +8,7 @@ MRuby.each_target do
     self.libmruby_objs << objfile("#{build_dir}/mrbgems/gem_init")
     file objfile("#{build_dir}/mrbgems/gem_init") => ["#{build_dir}/mrbgems/gem_init.c", "#{build_dir}/LEGAL"]
     file "#{build_dir}/mrbgems/gem_init.c" => [MRUBY_CONFIG, __FILE__] do |t|
-      FileUtils.mkdir_p "#{build_dir}/mrbgems"
+      mkdir_p "#{build_dir}/mrbgems"
       open(t.name, 'w') do |f|
         gem_func_gems = gems.select { |g| g.generate_functions }
         gem_func_decls = gem_func_gems.each_with_object('') do |g, s|
@@ -53,7 +53,7 @@ MRuby.each_target do
 
   # legal documents
   file "#{build_dir}/LEGAL" => [MRUBY_CONFIG, __FILE__] do |t|
-    FileUtils.mkdir_p File.dirname t.name
+    mkdir_p File.dirname t.name
     open(t.name, 'w+') do |f|
      f.puts <<LEGAL
 Copyright (c) #{Time.now.year} mruby developers