How to write plug-ins quickly with elisp

I've been giving cider Contribute a new feature[1], But before, it was just a patchwork configuration , It doesn't work ELisp I have carefully written a complete function , Still a little frustrated .

The main source of frustration is right ELisp Unfamiliar with relevant concepts in , such as xref In order to open symbol Documents of definition , Need to provide a xref-location object , By default, there are two implementations ,xref-buffer-location And xref-file-location.

file This is more intuitive , Pass in file/line/column that will do , But I buffer This one needs to be passed in position, But I didn't position How to construct , I guess position It's a (line . column) Of cons？ Later, I tested it, but it didn't work , Then go and see buffer location The definition of ,position The type is fixnum, Since it's a number , It should mean offset, Then another question , yes 0 At first it was 1 To start? ？

The story is almost finished here , In the end, I I found the answer on Li Sha's website , Call directly (point) You can get the current position position.

We can see from the example here ,ELisp Although the documents are complete , But a very important link is missing , namely demo. Need to know Lisp An important tool to improve production efficiency is REPL, No, demo Let me copy , Why am I REPL Li test ？

And programmers are lazy 、 Very busy , Go and look carefully manual Not reality , and Emacs Of manual I feel a little “ heavy ” 了 , There are too many words , Tired of watching , All I need is a very copy An example of , Then change it according to my needs , Just go clojuredocs like that , such as reduce[2] page ：

Fortunately Emacs China TG Group communication “ Experience ” after , Found out elisp-demos[3] plug-in unit , Can be in helpful The usage of the function is shown in the page ：

Last , Recommend another tutorial , For others Lisp Experienced programmers use it quickly ELisp.

• https://github.com/chrisdone/elisp-guide

Reference link

[1] feature: https://github.com/clojure-emacs/cider/pull/3026[2] reduce: https://clojuredocs.org/clojure.core/reduce[3] elisp-demos: https://github.com/xuchunyang/elisp-demos