Recently I began working on a personal python-based project. Having worked with python in the past, it was a welcoming experience. I wasn't really used to a indent-sensitive language. And I figured I could use some visual aids to quickly tell class and method definitions apart when scanning source files.
In my Emacs set-up I use the leuven theme. It's quite a minimal theme, which seems especially geared towards the use of org-mode. For non-emacs converts, one of the benefits of the Emacs display system is that you can have different font faces in a single document. For instance, the leuven theme uses a bigger font size for level 1 headings, and gives each level a different background color.
I figured I wanted something like that for class and method definitions. After some fiddeling around, I'm satisfied with the following snippet:
(font-lock-add-keywords 'python-mode
'(("^\s*\\(def\s*\\)\\(.*\\)\\((.*):.*\xa\\)" ; Highlight "def my_func(param):"
(1 '(:inherit font-lock-keyword-face :background "#F3F3F3"))
(2 '(:inherit font-lock-function-name-face :background "#F3F3F3" :weight bold))
(3 '(:background "#F3F3F3"))
)
("^\s*\\(class\s*\\)\\(.*\\)\\((.*):.*\xa\\)" ; Highlight "class MyClass(Base):"
(1 '(:inherit font-lock-keyword-face :background "#EEEEEE" :height 1.4))
(2 '(:inherit font-lock-function-name-face :background "#EEEEEE" :height 1.4 :weight bold))
(3 '(:background "#EEEEEE" :height 1.4))
)
("^\s*\\(class\s*\\)\\(.*\\)\\(:.*\xa\\)" ; Highlight "class MyClass:"
(1 '(:inherit font-lock-keyword-face :background "#EEEEEE" :height 1.4))
(2 '(:inherit font-lock-function-name-face :background "#EEEEEE" :height 1.4 :weight bold))
(3 '(:background "#EEEEEE" :height 1.4))
)
))
With some more work I could probably reduce this to a single regex. Oh well. Anyway, here's a screenshot with the result:
I opened an issue on the Leuven Theme github repo, to see if others like this as well.