Improve git diffs for various code files

https://tekin.co.uk/2020/10/better-git-diff-output-for-ruby-python-elixir-and-more

.gitattributes_global

@@ -0,0 +1,13 @@
+*.css diff=css
+
+*.html diff=html
+*.xhtml diff=html
+
+*.md diff=markdown
+
+*.py diff=python
+
+*.rb diff=ruby
+*.rake diff=ruby
+*.gemspec diff=ruby
+*_spec.rb diff=rspec

.gitconfig

@@ -18,12 +18,15 @@
 [core]
 	autocrlf = false
 	excludesfile = ~/.gitignore_global
+	attributesfile = ~/.gitattributes_global
 [color]
 	branch = auto
 	diff = auto
 	grep = auto
 	interactive = auto
 	ui = auto
+[diff "rspec"]
+	xfuncname = "^[ \t]*((RSpec|describe|context|it|before|after|around|feature|scenario)[ \t].*)$"
 [github]
 	user = meineerde
 [fetch]

Rakefile

@@ -30,8 +30,12 @@ namespace :install do
   files :ruby, ".irbrc", ".config/irb/*.rb", ".config/solargraph/*.yml"
 
   dot_files = %w[bin]
-  dot_files += %w[.bash_profile .bashrc .gemrc .gitignore_global .ackrc .rvmrc.dotfile]
-  dot_files += %w[.gitconfig .gitconfig_holgerjust.de .gitconfig_plan.io]
+  dot_files += %w[.bash_profile .bashrc .gemrc .ackrc .rvmrc.dotfile]
+  dot_files += %w[
+    .gitconfig .gitconfig_holgerjust.de .gitconfig_plan.io
+    .gitignore_global
+    .gitattributes_global
+  ]
   files :dot, *dot_files
 
   files :vim, *%w[.vim .vimrc]