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author | William Carroll <wpcarro@gmail.com> | 2019-10-09T11·13+0100 |
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committer | William Carroll <wpcarro@gmail.com> | 2019-12-24T15·21+0000 |
commit | 6b456c1b7a4f6899f063a6e65355af51901d9c7a (patch) | |
tree | cfc70d74818ae9fabdbbfb0cf16cce092e4c1a09 /configs/shared/.emacs.d/wpc/sequence.el | |
parent | a7c72adb2ebec1e497fc040eaf3551d564d61a5b (diff) |
Massive configuration overhaul
Currently paying the price of months of non-diligent git usage. Here's what has changed. - Theming support in Gvcci and wpgtk - Dropping support for i3 - Supporting EXWM - Many Elisp modules - Collapsed redundant directories in ./configs
Diffstat (limited to 'configs/shared/.emacs.d/wpc/sequence.el')
-rw-r--r-- | configs/shared/.emacs.d/wpc/sequence.el | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/configs/shared/.emacs.d/wpc/sequence.el b/configs/shared/.emacs.d/wpc/sequence.el new file mode 100644 index 000000000000..a5428ef04448 --- /dev/null +++ b/configs/shared/.emacs.d/wpc/sequence.el @@ -0,0 +1,105 @@ +;;; sequence.el --- Working with the "sequence" types -*- lexical-binding: t -*- +;; Author: William Carroll <wpcarro@gmail.com> + +;;; Commentary: +;; Elisp supports a typeclass none as "sequence" which covers the following +;; types: +;; - list: '(1 2 3 4 5) +;; - vector: ["John" 27 :blue] +;; - string: "To be or not to be..." + +;; TODO: Document the difference between a "reduce" and a "fold". I.e. - reduce +;; has an initial value whereas fold uses the first element in the sequence as +;; the initial value. +;; +;; Note: This should be an approximation of Elixir's Enum protocol albeit +;; without streams. +;; +;; Elisp has done a lot of this work already and these are mostly wrapper +;; functions. +;; See the following list for reference: +;; - sequencep +;; - elt +;; - copy-sequence +;; - reverse +;; - nreverse +;; - sort +;; - seq-elt +;; - seq-length +;; - seqp +;; - seq-drop +;; - seq-take +;; - seq-take-while +;; - seq-drop-while +;; - seq-do +;; - seq-map +;; - seq-mapn +;; - seq-filter +;; - seq-remove +;; - seq-reduce +;; - seq-some +;; - seq-find +;; - seq-every-p +;; - seq-empty-p +;; - seq-count +;; - seq-sort +;; - seq-contains +;; - seq-position +;; - seq-uniq +;; - seq-subseq +;; - seq-concatenate +;; - seq-mapcat +;; - seq-partition +;; - seq-intersection +;; - seq-difference +;; - seq-group-by +;; - seq-into +;; - seq-min +;; - seq-max +;; - seq-doseq +;; - seq-let + +;;; Code: + +;; Perhaps we can provide default implementations for `filter' and `map' derived +;; from the `reduce' implementation. +;; (defprotocol sequence +;; :functions (reduce)) +;; (definstance sequence list +;; :reduce #'list/reduce +;; :filter #'list/filter +;; :map #'list/map) +;; (definstance sequence vector +;; :reduce #'vector/reduce) +;; (definstance sequence string +;; :reduce #'string) + +(defun sequence/classify (xs) + "Return the type of `XS'." + (cond + ((listp xs) 'list) + ((vectorp xs) 'vector) + ((stringp xs) 'string))) + +(defun sequence/reduce (acc f xs) + "Reduce of `XS' calling `F' on x and `ACC'." + (seq-reduce + (lambda (acc x) + (funcall f x acc)) + xs + acc)) + +;; Elixir also turned everything into a list for efficiecy reasons. + +(defun sequence/filter (p xs) + "Filter `XS' with predicate, `P'. +Returns a list regardless of the type of `XS'." + (seq-filter p xs)) + +(defun sequence/map (f xs) + "Maps `XS' calling `F' on each element. +Returns a list regardless of the type of `XS'." + (seq-map f xs)) + +(provide 'sequence) +;;; sequence.el ends here |