generic_erb.rb: --vpath option

* tool/generic_erb.rb (vpath.open): move --vpath option from
  template/id.h.tmpl.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36822 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -855,8 +855,8 @@ insns: $(INSNS)
 $(ID_H_INCLUDES) $(ID_H_TARGET): {$(VPATH)}parse.h $(srcdir)/tool/generic_erb.rb $(srcdir)/template/id.h.tmpl
 	$(ECHO) generating id.h
 	$(Q) $(BASERUBY) $(srcdir)/tool/generic_erb.rb --if-change --output=id.h \
-		--timestamp=$@ \
-		$(srcdir)/template/id.h.tmpl --vpath=$(VPATH) parse.h
+		--vpath=$(VPATH) --timestamp \
+		$(srcdir)/template/id.h.tmpl parse.h
 
 node_name.inc: {$(VPATH)}node.h
 	$(ECHO) generating $@

template/id.h.tmpl

@@ -12,24 +12,13 @@
 **********************************************************************/
 <%
 require 'optparse'
-vpath = ["."]
-input = nil
 
-opt = OptionParser.new do |o|
-  o.on('-v', '--vpath=DIR') {|dirs| vpath.concat dirs.split(File::PATH_SEPARATOR)}
-  input, = o.order!(ARGV)
-end or abort opt.opt_s
+input = ARGV.shift or abort opt.opt_s
 
 tokens = nil
-vpath.find do |dir|
-  begin
-    if line = File.read(File.join(dir, input))[/^\s*enum\s+yytokentype\s*\{([^{}]*)\s*\};/m, 1]
-      tokens = line.scan(/\b(t(?:LAST_TOKEN|U(?:PLUS|MINUS)|POW|CMP|EQQ?|[NGL]EQ|(?:AND|OR)OP|N?MATCH|DOT\d|AREF|ASET|[LR]SHFT|LAMBDA)|id\w+)\s*=\s*(\d+),?/m)
-    end
-  rescue Errno::ENOENT
-    nil
-  else
-    true
+vpath.open(input) do |f|
+  if line = f.read[/^\s*enum\s+yytokentype\s*\{([^{}]*)\s*\};/m, 1]
+    tokens = line.scan(/\b(t(?:LAST_TOKEN|U(?:PLUS|MINUS)|POW|CMP|EQQ?|[NGL]EQ|(?:AND|OR)OP|N?MATCH|DOT\d|AREF|ASET|[LR]SHFT|LAMBDA)|id\w+)\s*=\s*(\d+),?/m)
   end
 end
 

tool/generic_erb.rb

@@ -2,13 +2,27 @@ require 'erb'
 require 'optparse'
 require 'fileutils'
 
+vpath = ["."]
+def vpath.open(file, *rest)
+  find do |dir|
+    begin
+      path = File.join(dir, file)
+      return File.open(path, *rest) {|f| yield(f)}
+    rescue Errno::ENOENT
+      nil
+    end
+  end or raise(Errno::ENOENT, file)
+end
+
 timestamp = nil
 output = nil
 ifchange = nil
+
 opt = OptionParser.new do |o|
   o.on('-t', '--timestamp[=PATH]') {|v| timestamp = v || true}
   o.on('-o', '--output=PATH') {|v| output = v}
   o.on('-c', '--[no-]if-change') {|v| ifchange = v}
+  o.on('-v', '--vpath=DIR') {|dirs| vpath.concat dirs.split(File::PATH_SEPARATOR)}
   o.order!(ARGV)
 end
 template = ARGV.shift or abort opt.to_s
@@ -16,7 +30,7 @@ erb = ERB.new(File.read(template), nil, '%')
 erb.filename = template
 result = erb.result
 if output
-  if ifchange and (IO.read(output) rescue nil) == result
+  if ifchange and (vpath.open(output) {|f| f.read} rescue nil) == result
     puts "#{output} unchanged"
   else
     open(output, "wb") {|f| f.print result}