A fish shell function that opens the default editor with a date prepended filename and the specified title for jekyll posts.

jp.fish

function jp -d "Open default editor with date prepended filename and specified title for jekyll posts."

  set title (date +"%Y-%m-%d")
  
  switch (count $argv) 
    case 0
      echo "No post title was specified."
      return 1
    case 1
      set lower_arg (echo $argv[1] | tr A-Z a-z)
      set title $title-$lower_arg.md
    case \*
      for arg in $argv
        set lower_arg (echo $arg | tr A-Z a-z)
        set title $title-$lower_arg
      end
      set title $title.md
  end
  
  EDITOR $title
end

Put this file in your ~/.config/fish/functions directory. If you haven't already defined an EDITOR function, add an editor.fish file to the same directory, with the following code:

function EDITOR
        vim $argv
end

Finally, create a blog post about your adventures:

$ jp My wonderful new blog post

*Note: quotes around the post title are optional.

All text will be converted to lowercase when using the latest revision.