ENH: add more ruby paths: sitearch, sitelib, vendorarch, vendorlib (#5531)

-make these variables cached and ADVANCED
-remove unused QUIETLY code
-document RUBY_LIBRARY

Alex

Modules/FindRuby.cmake

@@ -5,16 +5,12 @@
 #
 #  RUBY_INCLUDE_PATH = path to where ruby.h can be found
 #  RUBY_EXECUTABLE   = full path to the ruby binary
+#  RUBY_LIBRARY      = full path to the ruby library
 
 # Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
 # See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
 
 
-if(RUBY_LIBRARY AND RUBY_INCLUDE_PATH)
-   # Already in cache, be silent
-   set(RUBY_FIND_QUIETLY TRUE)
-endif (RUBY_LIBRARY AND RUBY_INCLUDE_PATH)
-
 #   RUBY_ARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"archdir"@:>@)'`
 #   RUBY_SITEARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitearchdir"@:>@)'`
 #   RUBY_SITEDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitelibdir"@:>@)'`
@@ -23,20 +19,51 @@ endif (RUBY_LIBRARY AND RUBY_INCLUDE_PATH)
 
 FIND_PROGRAM(RUBY_EXECUTABLE NAMES ruby ruby1.8 ruby18 ruby1.9 ruby19)
 
-EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['archdir']"
-   OUTPUT_VARIABLE RUBY_ARCH_DIR)
 
+IF(RUBY_EXECUTABLE  AND NOT  RUBY_ARCH_DIR)
+   EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['archdir']"
+      OUTPUT_VARIABLE RUBY_ARCH_DIR)
+
+   EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['libdir']"
+      OUTPUT_VARIABLE RUBY_POSSIBLE_LIB_DIR)
+
+   EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['rubylibdir']"
+      OUTPUT_VARIABLE RUBY_RUBY_LIB_DIR)
+
+   # site_ruby
+   EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['sitearchdir']"
+      OUTPUT_VARIABLE RUBY_SITEARCH_DIR)
+
+   EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['sitelibdir']"
+      OUTPUT_VARIABLE RUBY_SITELIB_DIR)
+
+   # vendor_ruby available ?
+   EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r vendor-specific -e "print 'true'"
+      OUTPUT_VARIABLE RUBY_HAS_VENDOR_RUBY  ERROR_QUIET)
+
+   IF(RUBY_HAS_VENDOR_RUBY)
+      EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['vendorlibdir']"
+         OUTPUT_VARIABLE RUBY_VENDORLIB_DIR)
+
+      EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['vendorarchdir']"
+         OUTPUT_VARIABLE RUBY_VENDORARCH_DIR)
+   ENDIF(RUBY_HAS_VENDOR_RUBY)
 
-EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['libdir']"
-   OUTPUT_VARIABLE RUBY_POSSIBLE_LIB_PATH)
+   # save the results in the cache so we don't have to run ruby the next time again
+   SET(RUBY_ARCH_DIR         ${RUBY_ARCH_DIR}         CACHE PATH "The Ruby arch dir")
+   SET(RUBY_POSSIBLE_LIB_DIR ${RUBY_POSSIBLE_LIB_DIR} CACHE PATH "The Ruby lib dir")
+   SET(RUBY_RUBY_LIB_DIR     ${RUBY_RUBY_LIB_DIR}     CACHE PATH "The Ruby ruby-lib dir")
+   SET(RUBY_SITEARCH_DIR     ${RUBY_SITEARCH_DIR}     CACHE PATH "The Ruby site arch dir")
+   SET(RUBY_SITELIB_DIR      ${RUBY_SITELIB_DIR}      CACHE PATH "The Ruby site lib dir")
+   SET(RUBY_HAS_VENDOR_RUBY  ${RUBY_HAS_VENDOR_RUBY}  CACHE BOOL "Vendor Ruby is available")
+   SET(RUBY_VENDORARCH_DIR   ${RUBY_VENDORARCH_DIR}   CACHE PATH "The Ruby vendor arch dir")
+   SET(RUBY_VENDORLIB_DIR    ${RUBY_VENDORLIB_DIR}    CACHE PATH "The Ruby vendor lib dir")
 
-EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "puts Config::CONFIG['rubylibdir']"
-   OUTPUT_VARIABLE RUBY_RUBY_LIB_PATH)
+ENDIF(RUBY_EXECUTABLE  AND NOT  RUBY_ARCH_DIR)
 
-# remove the new lines from the output by replacing them with empty strings
-STRING(REPLACE "\n" "" RUBY_ARCH_DIR "${RUBY_ARCH_DIR}")
-STRING(REPLACE "\n" "" RUBY_POSSIBLE_LIB_PATH "${RUBY_POSSIBLE_LIB_PATH}")
-STRING(REPLACE "\n" "" RUBY_RUBY_LIB_PATH "${RUBY_RUBY_LIB_PATH}")
+# for compatibility
+SET(RUBY_POSSIBLE_LIB_PATH ${RUBY_POSSIBLE_LIB_DIR})
+SET(RUBY_RUBY_LIB_PATH ${RUBY_RUBY_LIB_DIR})
 
 
 FIND_PATH(RUBY_INCLUDE_PATH
@@ -49,11 +76,19 @@ FIND_PATH(RUBY_INCLUDE_PATH
 FIND_LIBRARY(RUBY_LIBRARY
   NAMES ruby ruby1.8 ruby1.9
         msvcrt-ruby18 msvcrt-ruby19 msvcrt-ruby18-static msvcrt-ruby19-static
-  PATHS ${RUBY_POSSIBLE_LIB_PATH}
+  PATHS ${RUBY_POSSIBLE_LIB_DIR}
   )
 
 MARK_AS_ADVANCED(
   RUBY_EXECUTABLE
   RUBY_LIBRARY
   RUBY_INCLUDE_PATH
+  RUBY_ARCH_DIR
+  RUBY_POSSIBLE_LIB_DIR
+  RUBY_RUBY_LIB_DIR
+  RUBY_SITEARCH_DIR
+  RUBY_SITELIB_DIR
+  RUBY_HAS_VENDOR_RUBY
+  RUBY_VENDORARCH_DIR
+  RUBY_VENDORLIB_DIR
   )