Update xdg_base to support existing configuration (#2512)

Update to use CREW_DEST_HOME constant

All content from ~/.config and ~/.local symlinks to #{CREW_PREFIX}/.config

packages/xdg_base.rb

@@ -3,25 +3,35 @@ require 'package'
 class Xdg_base < Package
   description 'XDG Base Directory Specification Configuration'
   homepage 'https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html'
-  version '0.7'
+  version '0.7-1'
   source_url 'https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html'
   source_sha256 '342289ad33b48b8f643278f74cafa182f4471d490b82dc5e442e2e720fa4080f'
 
+  def self.preinstall
+    # Save any previous configuration, if it exists.
+    if Dir.exists? "$HOME/.config"
+      system "cp -r $HOME/.config #{CREW_PREFIX} && rm -rf $HOME/.config"
+    end
+    if Dir.exists? "$HOME/.local"
+      system "mkdir -p #{CREW_PREFIX}/.config" unless Dir.exists? "#{CREW_PREFIX}/.config"
+      system "cp -r $HOME/.local/* #{CREW_PREFIX}/.config && rm -rf $HOME/.local"
+    end
+  end
+
   def self.install
     # Changes the ~/.config and ~/.local directories to use symlinks instead.
     # This is needed in cases when executables are installed in these locations.
-    system "mkdir -p #{CREW_DEST_DIR}$HOME"
+    system "mkdir -p #{CREW_DEST_HOME}"
     system "mkdir -p #{CREW_DEST_PREFIX}/.config"
-    system "mkdir -p #{CREW_DEST_PREFIX}/.local"
-    system "ln -s #{CREW_PREFIX}/.config #{CREW_DEST_DIR}$HOME/.config"
-    system "ln -s #{CREW_PREFIX}/.local #{CREW_DEST_DIR}$HOME/.local"
-    system "ln -s #{CREW_PREFIX}/.config $HOME/.config"
-    system "ln -s #{CREW_PREFIX}/.config $HOME/.local"
+    system "ln -s #{CREW_PREFIX}/.config #{CREW_DEST_HOME}/.config"
+    system "ln -s #{CREW_PREFIX}/.config #{CREW_DEST_HOME}/.local"
+    system "ln -sf #{CREW_PREFIX}/.config $HOME/.config"
+    system "ln -sf #{CREW_PREFIX}/.config $HOME/.local"
   end
 
   def self.postinstall
     puts
-    puts "The following bash environment variables should set as shown below:".lightblue
+    puts "The following bash environment variables should be set as shown below:".lightblue
     puts "echo '# XDG Base Directory Specification Environment Variables' >> ~/.bashrc".lightblue
     puts "echo '# See https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html.' >> ~/.bashrc".lightblue
     puts "echo 'export XDG_DATA_HOME=\$HOME/.local/share' >> ~/.bashrc".lightblue