Range pattern

Range pattern for pcase.

Requirenments

• emacs 27.1 higher

Features

• Function to check whether number is in a specific range
• in and not-in operators for pcase

Installation

Copy-paste plugin script contents to ~/.emacs while enabling lexical-binding

Example ~/.emacs config:

;;; -*- lexical-binding: t; -*-
(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
(package-initialize)

;; The extension file content with all comments removed can be placed here.

(custom-set-variables
;; custom-set-variables was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
'(package-selected-packages '(markdown-mode)))
(custom-set-faces
;; custom-set-faces was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
)

Functionality

To use open started or ended ranges replace from or to with infinity symbol. By convention all parameters are ordered as follows:

• number, from, to, exclude-from, and exclude-from (for function)
• from, and to (for pattern in pcase)

Below square brackets are used to represent optional parameters and not arrays.

• Function: range-pattern-check number from to [exclude-from exclude-to] Description: Check whether a number in a specific range.

Examples

Check whether 20 in a [10..50] range:

(range-pattern-check 20 10 50)

Check whether 20 in a [10..50] range via pattern matching:

(pcase 20
  ((in 10 50) "in range")
  (_ "anything else"))

Check whether 20 in a [10..infinity] range via pattern matching:

(pcase 20
  ((in 10 'infinity) "in range")
  (_ "anything else"))