nobu	2013-05-15 16:51:32 +0900 (Wed, 15 May 2013)

  New Revision: 40755

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=40755

  Log:
    ifchange: --keep option
    
    * tool/ifchange (--keep=suffix): new option for debug.

  Modified files:
    trunk/tool/ifchange

Index: tool/ifchange
===================================================================
--- tool/ifchange	(revision 40754)
+++ tool/ifchange	(revision 40755)
@@ -2,6 +2,7 @@ https://github.com/ruby/ruby/blob/trunk/tool/ifchange#L2
 # usage: ifchange target temporary
 
 timestamp=
+keepsuffix=
 until [ "$0" = 0 ]; do
     case "$1" in
 	--timestamp)
@@ -10,6 +11,12 @@ until [ "$0" = 0 ]; do https://github.com/ruby/ruby/blob/trunk/tool/ifchange#L11
 	--timestamp=*)
 	    timestamp=`expr \( "$1" : '[^=]*=\(.*\)' \)`
 	    ;;
+	--keep)
+	    keepsuffix=.old
+	    ;;
+	--keep=*)
+	    keepsuffix=`expr \( "$1" : '[^=]*=\(.*\)' \)`
+	    ;;
 	*)
 	    break
 	    ;;
@@ -30,6 +37,7 @@ if cmp "$target" "$temp" >/dev/null 2>&1 https://github.com/ruby/ruby/blob/trunk/tool/ifchange#L37
     rm -f "$temp"
 else
     echo "$target updated"
+    ${keepsuffix:+ mv -f "$target" "${target}${keepsuffix}" }
     mv -f "$temp" "$target"
 fi
 

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