From 7410928b5bddc12b488b102315260129565ed7ef Mon Sep 17 00:00:00 2001 From: William Carroll Date: Fri, 29 Jul 2022 18:26:43 -0700 Subject: feat(wpcarro/emacs): Package bag.el More Elisp packaging :) Change-Id: I4cf5695fd97ed922b8dfe698a168061042208c73 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6001 Reviewed-by: wpcarro Autosubmit: wpcarro Tested-by: BuildkiteCI --- users/wpcarro/emacs/pkgs/bag/bag.el | 78 ++++++++++++++++++++++++++++++++ users/wpcarro/emacs/pkgs/bag/default.nix | 26 +++++++++++ users/wpcarro/emacs/pkgs/bag/tests.el | 36 +++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 users/wpcarro/emacs/pkgs/bag/bag.el create mode 100644 users/wpcarro/emacs/pkgs/bag/default.nix create mode 100644 users/wpcarro/emacs/pkgs/bag/tests.el (limited to 'users/wpcarro/emacs/pkgs/bag') diff --git a/users/wpcarro/emacs/pkgs/bag/bag.el b/users/wpcarro/emacs/pkgs/bag/bag.el new file mode 100644 index 000000000000..502f5672536e --- /dev/null +++ b/users/wpcarro/emacs/pkgs/bag/bag.el @@ -0,0 +1,78 @@ +;;; bag.el --- Working with bags (aka multi-sets) -*- lexical-binding: t -*- + +;; Author: William Carroll +;; Version: 0.0.1 +;; Package-Requires: ((emacs "24.3")) + +;;; Commentary: +;; What is a bag? A bag should be thought of as a frequency table. It's a way +;; to convert a list of something into a set that allows duplicates. Isn't +;; allowing duplicates the whole thing with Sets? Kind of. But the interface +;; of Sets is something that bags resemble, so multi-set isn't as bad of a name +;; as it may first seem. +;; +;; If you've used Python's collections.Counter, the concept of a bag should be +;; familiar already. +;; +;; Interface: +;; - add :: x -> Bag(x) -> Bag(x) +;; - remove :: x -> Bag(x) -> Bag(x) +;; - union :: Bag(x) -> Bag(x) -> Bag(x) +;; - difference :: Bag(x) -> Bag(x) -> Bag(x) + +;;; Code: + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Dependencies +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(require 'al) +(require 'list) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Library +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(cl-defstruct bag xs) + +(defun bag-new () + "Create an empty bag." + (make-bag :xs (al-new))) + +(defun bag-from-list (xs) + "Map a list of `XS' into a bag." + (->> xs + (list-reduce (bag-new) #'bag-add))) + +(defun bag-add (x xs) + "Add X to XS." + (if (bag-contains? x xs) + (struct-update + bag xs (lambda (xs) (al-update x (lambda (x) (+ 1 x)) xs)) xs) + (struct-update bag xs (lambda (xs) (al-set x 1 xs)) xs))) + +(defun bag-remove (x xs) + "Remove X from XS. +This is a no-op is X doesn't exist in XS." + (when (bag-contains? x xs) + (struct-update bag xs (lambda (xs) (al-delete x xs)) xs))) + +(defun bag-count (x xs) + "Return the number of occurrences of X in XS." + (al-get x (bag-xs xs) 0)) + +(defun bag-total (xs) + "Return the total number of elements in XS." + (->> (bag-xs xs) + (al-reduce 0 (lambda (_key v acc) (+ acc v))))) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Predicates +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(defun bag-contains? (x xs) + "Return t if XS has X." + (al-has-key? x (bag-xs xs))) + +(provide 'bag) +;;; bag.el ends here diff --git a/users/wpcarro/emacs/pkgs/bag/default.nix b/users/wpcarro/emacs/pkgs/bag/default.nix new file mode 100644 index 000000000000..3dedc27286d1 --- /dev/null +++ b/users/wpcarro/emacs/pkgs/bag/default.nix @@ -0,0 +1,26 @@ +{ pkgs, depot, ... }: + +let + bag = pkgs.callPackage + ({ emacsPackages }: + emacsPackages.trivialBuild { + pname = "bag"; + version = "1.0.0"; + src = ./bag.el; + packageRequires = + (with depot.users.wpcarro.emacs.pkgs; [ + al + list + ]); + }) + { }; + + emacs = (pkgs.emacsPackagesFor pkgs.emacs28).emacsWithPackages (epkgs: [ bag ]); +in +bag.overrideAttrs (_old: { + doCheck = true; + checkPhase = '' + ${emacs}/bin/emacs -batch \ + -l ert -l ${./tests.el} -f ert-run-tests-batch-and-exit + ''; +}) diff --git a/users/wpcarro/emacs/pkgs/bag/tests.el b/users/wpcarro/emacs/pkgs/bag/tests.el new file mode 100644 index 000000000000..0cc2a6029e3c --- /dev/null +++ b/users/wpcarro/emacs/pkgs/bag/tests.el @@ -0,0 +1,36 @@ +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Dependencies +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(require 'ert) +(require 'bag) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Tests +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(setq fixture (bag-from-list '(1 1 1 2 2 3))) + +(ert-deftest bag-add () + (and + (not (bag-contains? 4 fixture)) + (bag-contains? 4 (bag-add 4 fixture)))) + +(ert-deftest bag-remove () + (and + (bag-contains? 1 fixture) + (not (bag-contains? 3 (bag-remove 3 fixture))))) + +(ert-deftest bag-count () + (and + (= 3 (bag-count 1 fixture)) + (= 2 (bag-count 2 fixture)) + (= 1 (bag-count 3 fixture)))) + +(ert-deftest bag-total () + (= 6 (bag-total fixture))) + +(ert-deftest bag-contains? () + (and + (bag-contains? 1 fixture) + (not (bag-contains? 4 fixture)))) -- cgit 1.4.1