Here we look at a way to get tool tips on text in Emacs. This would be helpful for giving hints, or definitions, or reminders about something. Tool tips are created by setting the help-echo text property for the string of interest. We will write a function that adds the tool tip to every instance of a string in the current buffer. We will also change the color of the string slightly to give the reader a hint there might be something there.
Here is the code. We use save-excursion so that the cursor stays where it starts. Then we search for the string we want a tool tip on, and set the appropriate properties.
What is a foobar?
; add a tooltip to every instance of foobar (save-excursion ;return cursor to current-point (goto-char 1) (while (search-forward "foobar" (point-max) t) (set-text-properties (match-beginning 0) (match-end 0) `(help-echo "You know... a bar for foos!" font-lock-face (:foreground "dark slate gray")) )))
After you run the function above, the next sentence should have a grayed word in it, and when you hold your mouse over the grayed word a tool tip should appear.
There is a foobar in the woods.
You can see the effect here:
This could be an interesting way to increase the depth and richness of text. To use it you would have to define a function that runs when a file is opened, or call the function after opening a file.
Copyright (C) 2013 by John Kitchin. See the License for information about copying.