CD plugin for handling rvm enabled folders

plugins/cd/cd.fish

+function cd --description "Change working directory"
+  # Source a .rvmrc file in a directory after changing to it, if it exists.
+  # To disable this feature, set rvm_project_rvmrc=0 in $HOME/.rvmrc
+
+  builtin cd "$argv"
+  if test "$rvm_project_rvmrc" != 0
+    set -l cwd $PWD
+    while true
+      if contains $cwd "" $HOME "/"
+        if test "$rvm_project_rvmrc_default" = 1
+          rvm default 1>/dev/null 2>&1
+        end
+        break
+      else
+        if test -s ".rvmrc"
+          eval "rvm reload" > /dev/null
+          break
+        else
+          set cwd (dirname "$cwd")
+        end
+      end
+    end
+
+    set -e cwd
+  end
+end