15c9ff4902
Originally I set-out to package `al.el`, but as I started traversing the dependencies, I needed to package increasingly more packages. I refactored some of these to prune their dependencies to slay this hydra before it turned into a never-ending project. I have mixed feelings about this. I also introduced `ert` and unit tests into my Elisp packaging, so it'll be nice to have build-time tests that run when Emacs updates land in depot. Change-Id: I2756dc60888b80255a495e08ae61bd547e6b3db2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/5998 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Tested-by: BuildkiteCI
68 lines
2.1 KiB
EmacsLisp
68 lines
2.1 KiB
EmacsLisp
;;; struct.el --- Helpers for working with structs -*- lexical-binding: t -*-
|
|
|
|
;; Author: William Carroll <wpcarro@gmail.com>
|
|
;; Version: 0.0.1
|
|
;; Package-Requires: ((emacs "24.3"))
|
|
|
|
;;; Commentary:
|
|
;; Provides new macros for working with structs. Also provides adapter
|
|
;; interfaces to existing struct macros, that should have more intuitive
|
|
;; interfaces.
|
|
;;
|
|
;; Sometimes `setf' just isn't enough.
|
|
|
|
;;; Code:
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; Dependencies
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(require 's)
|
|
(require 'dash)
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; Library
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(defmacro struct-update (type field f xs)
|
|
"Apply F to FIELD in XS, which is a struct of TYPE.
|
|
This is immutable."
|
|
(let ((copier (->> type
|
|
symbol-name
|
|
(s-prepend "copy-")
|
|
intern))
|
|
(accessor (->> field
|
|
symbol-name
|
|
(s-prepend (s-concat (symbol-name type) "-"))
|
|
intern)))
|
|
`(let ((copy (,copier ,xs)))
|
|
(setf (,accessor copy) (funcall ,f (,accessor copy)))
|
|
copy)))
|
|
|
|
(defmacro struct-set (type field x xs)
|
|
"Immutably set FIELD in XS (struct TYPE) to X."
|
|
(let ((copier (->> type
|
|
symbol-name
|
|
(s-prepend "copy-")
|
|
intern))
|
|
(accessor (->> field
|
|
symbol-name
|
|
(s-prepend (s-concat (symbol-name type) "-"))
|
|
intern)))
|
|
`(let ((copy (,copier ,xs)))
|
|
(setf (,accessor copy) ,x)
|
|
copy)))
|
|
|
|
(defmacro struct-set! (type field x xs)
|
|
"Set FIELD in XS (struct TYPE) to X mutably.
|
|
This is an adapter interface to `setf'."
|
|
(let ((accessor (->> field
|
|
symbol-name
|
|
(s-prepend (s-concat (symbol-name type) "-"))
|
|
intern)))
|
|
`(progn
|
|
(setf (,accessor ,xs) ,x)
|
|
,xs)))
|
|
|
|
(provide 'struct)
|
|
;;; struct.el ends here
|