v4 v5: rake create build & install sisu gemspec; bin/sisugem (add .gitignore)

* rake gemcbi #(create build install sisu gem)
* rake gemspecscreate && \
  rake gembuild && \
  sudo rake geminstall
* rake gemspecscreate && \
  gem build sisu5.gemspec && \
  sudo gem install --no-rdoc --no-ri \
  sisu-5.1.0.gem
* bin/sisu updated (modified to take account of gems)
* bin/sisugem added
* .gitignore sisu-*.gem sisu*.gemspec
  consider inclusion (& tracking) of rake created sisu4.gemspec sisu5.gemspec
  (as this makes their availability more obvious)
* once gem is installed: "sisu _5.1.0_ -vM" (to see version, commands otherwise
  as usual) if paths are such that sisu is not available "sisugem _5.1.0_ -vM"
  should work (as it is installed by gemspec, but not other sisu installers)

2 files changed, 17 insertions, 9 deletions

diff --git a/bin/sisu b/bin/sisu
index 7dcb09bb..0786500f 100644
--- a/bin/sisu
+++ b/bin/sisu
@@ -54,31 +54,35 @@ WOK
   $KCODE='u' if RUBY_VERSION < '1.9'
   argv=$*
   SiSU_called_from_directory=Dir.pwd
-  if $0 !~/\bsisu[45]$/
+  require 'rubygems'
+  check_sisu_stable_ruby_version?
+  if __FILE__ =~/gem/ \
+  and  __FILE__ =~/sisu-[45]\.\d+\.\d+/
+    SiSU_version_dir=(__FILE__ =~/sisu-5\.\d+\.\d+/) \
+    ? 'v5'
+    : 'v4'
+  elsif $0 !~/\b(?:sisu[45]|sisugem)$/
     SiSU_version_dir=case argv.inspect
     when /"(?:--v4)"/
-      check_sisu_stable_ruby_version?
       'v4'
     when /"(?:--v5)"/
-      check_sisu_stable_ruby_version?
       'v5'
-    when /"(?:--dev)"/
-      check_sisu_dev_ruby_version?
+    when /"--dev"/
       'v5'
     else
-      check_sisu_stable_ruby_version?
       'v4'
     end
   else
     SiSU_version_dir=case $0
     when /\bsisu4$/
-      check_sisu_stable_ruby_version?
       'v4'
     when /\bsisu5$/
-      check_sisu_stable_ruby_version?
       'v5'
+    when /sisugem$/  # should have been caught earlier, unused, debug check
+      SiSU_version_dir=(__FILE__ =~/sisu-5\.\d+\.\d+/) \
+      ? 'v5'
+      : 'v4'
     else
-      check_sisu_stable_ruby_version?
       'v4'
     end
   end
@@ -158,6 +162,7 @@ rescue
   STDERR.puts $!
   STDERR.puts $@
   require 'rbconfig'
+  require 'rubygems'
   e=Config::CONFIG
   puts %{
                    #{%x{ruby -v}.strip.to_s}
@@ -166,6 +171,8 @@ rescue
     ruby named:    #{e['ruby_version']}
     rubylib:       #{e['rubylibdir']}
     rubylib local: #{e['sitelibdir']}
+    gem dir:       #{Gem.dir}
+    gem path:      #{Gem.path}
   }
   system(%{echo "
     system RUBYPATH: ${RUBYPATH}
diff --git a/bin/sisugem b/bin/sisugem
new file mode 120000
index 00000000..b4999d51
--- /dev/null
+++ b/bin/sisugem
@@ -0,0 +1 @@
+sisu
\ No newline at end of file