Move the rules for win32_vk

Enable the rules only when `gperf` command is available.  And replace
`gperf.sed` with `extract-vk.rb` script.

Author: nobu

ext/io/console/depend

@@ -1,21 +1,3 @@
-# mkdepend: depends win32_vk.inc => $(VK_HEADER)
-
 # AUTOGENERATED DEPENDENCIES START
 console.o: console.c
 # AUTOGENERATED DEPENDENCIES END
-
-win32_vk.inc: win32_vk.list $(srcdir)/extract-vk.rb
-
-.list.inc:
-	( \
-	$(RUBY) $(srcdir)/extract-vk.rb $< && \
-	gperf --ignore-case -L ANSI-C -E -C -P -p -j1 -i 1 -g -o -t -K ofs -N console_win32_vk -k* $< \
-	| sed -f $(top_srcdir)/tool/gperf.sed \
-	) > $(@F)
-
-.SUFFIXES: .chksum .list .inc
-
-.list.chksum:
-	@$(RUBY) -I$(top_srcdir)/tool -rchecksum \
-	    -e "Checksum.update(ARGV) {|k|k.copy(k.target) rescue k.make(k.target)}" \
-	    -- --make=$(MAKE) -I$(srcdir) $(<F) $(@F:.chksum=.inc)

ext/io/console/extconf.rb

@@ -52,8 +52,22 @@
   have_const("RB_WARN_CATEGORY_DEPRECATED")
   win32 or have_func("ttyname_r") or have_func("ttyname")
   have_func("rb_prepend_module") # not exported by TruffleRuby
+  vk_tool = find_executable("gperf")
   create_makefile("io/console") {|conf|
-    conf << "\n""VK_HEADER = #{vk_header}\n"
+    if vk_header
+      conf << <<~MK
+        VK_HEADER = #{vk_header}
+        all:
+        console.#$OBJEXT: $(VK_HEADER)
+      MK
+    end
+    if vk_tool
+      unless conf.any? {|c| /^ *top_srcdir *=/.match?(c)}
+        conf << "top_srcdir = $(srcdir)/../../..\n"
+      end
+      conf.concat(depend_rules(File.read("#$srcdir/win32_vk.mk")))
+    end
+    conf
   }
 when nil
   File.write("Makefile", dummy_makefile($srcdir).join(""))

ext/io/console/extract-vk.rb

@@ -1,7 +1,18 @@
 code = [+""]
-ARGF.read.scan(/^\w+,\s*\KVK_\w+/) do |n|
+source = File.read(ARGV.shift)
+source.scan(/^\w+,\s*\KVK_\w+/) do |n|
   puts("#ifndef #{n}\n# define #{n} UNDEFINED_VK\n#endif")
   code << +"" if n.size + code.last.size > 60
   code.last << " x(#{n})z"
 end
 puts ["#define EACH_VK(x,z)", code].join(" \\\n    "), ""
+IO.popen(["gperf", *ARGV], "r+") do |f|
+  w = Thread.start {
+    f.puts source
+    f.close_write
+  }
+  puts f.read.sub(/^\w*hash .*\{(?m:.*?)\n\}/) {
+    $&.sub!(" hval = ", " hval = (unsigned int)")
+  }
+  w.join
+end

ext/io/console/win32_vk.mk

@@ -0,0 +1,13 @@
+win32_vk.inc: win32_vk.list $(srcdir)/extract-vk.rb
+
+.list.inc:
+	$(Q)$(RUBY) $(srcdir)/extract-vk.rb $< \
+	    --ignore-case -L ANSI-C -E -C -P -p -j1 -i 1 -g -o -t -K ofs -N console_win32_vk -k* \
+	    > $(@F)
+
+.SUFFIXES: .chksum .list .inc
+
+.list.chksum:
+	@$(RUBY) -I$(top_srcdir)/tool -rchecksum \
+	    -e "Checksum.update(ARGV) {|k|k.copy(k.target) rescue k.make(k.target)}" \
+	    -- --make=$(MAKE) -I$(srcdir) $(<F) $(@F:.chksum=.inc)

tool/test/test_mkdepend.rb

@@ -336,8 +336,6 @@ def test_virtual_dependencies_are_declared
       %w[eventids1.h {$(VPATH)}eventids1.c],
       ripper.dependencies['eventids1.c'],
     )
-    console = mkdepend.dependency_declarations('ext/io/console/depend')
-    assert_equal(%w[$(VK_HEADER)], console.dependencies['win32_vk.inc'])
     assert_include(
       mkdepend.dependency_targets('ext/socket/depend'),
       'constdefs.h',