Package uses f.el without declaring the dependency, I think

[fiddlemath]

I haven't looked deeply into the code, but I just did a fresh install of obsidian.el from MELPA. Following a wikilink to an not-yet-existing file (one of the first things I tried) failed because it couldn't find f-mkdir-full-path, a function from f.el.

I did not have f.el installed; after installing it from MELPA things worked fine.

[jayemar]

f is the first thing required by obsidian.el. Interesting that it wasn't installed for you after a fresh install.

obsidian.el/obsidian.el

Line 39 in 24ff6ef

(require 'f)