Highlight Multiple Lines in Emacs

Question

I wonder if there is any package which lets me do this:

• Hightlight entire line where point is currently located
• If you move point away, it keeps the that line highlighted
• Multiple lines can be highlighted in similar way
• Clear all highlights with another command

I think this is very useful and I wonder someone would have done it already.

-- A newby EMACS lover.

Edit: Adding more explanation Let's say I have a file with 10 lines, I want to highlight 3rd, 5th and 7th line. What I would like to do is, move point to those lines one by one and execute some command (let's say highlight-this-line), it should keep the past highlighted lines as highlighted until let's say clear-highlight-command is executed which should clear all highlights

Answer 1

Use library Highlight (highlight.el).

(defun highlight-this-line ()
  "Highlight the current line."
  (interactive)
  (hlt-highlight-region (line-beginning-position) (line-end-position)))

You can also pass the FACE to use as an arg to hlt-highlight-region.