Emacs autoformatting in less than 100 lines of code.
Formatting is controlled via the special variable *efmt-format-alist* that maps file extensions or major modes to formatters. Here's an example of how one might configure the list:
(setq *efmt-format-alist*
'(("el" #'my-custom-elisp-formatter)
("js" ("prettier" "-w" "<TARGET>"))
(ruby-mode ("rufo" "<TARGET>"))
("go" ("gofmt" "-w" "<TARGET>"))))More formally, you'll need to create a list of lists with the following structure:
- The first element is a string that is the file extension or a symbol that is the major mode.
- The second element is either:
- A function to run.
- A list of shell command arguments to execute on the file
<TARGET>.
If you have two different formatters in the list that could apply to a file based on both its major mode and its extension, the one associated with the file extension will win.
With that set up, you can format a buffer using M-x efmt from inside Emacs. Note that the point might move somewhere unexpected. You can also hook efmt up to an autosave hook, if you like.
Install eldev and run:
eldev testFrom inside this directory.