134 lines
5.3 KiB
Org Mode
134 lines
5.3 KiB
Org Mode
#+title: Personal Password Generator
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#+author: Howard X. Abrams
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#+date: 2021-01-11
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#+tags: emacs
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A literate programming version for Emacs code to generate and store passwords.
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#+begin_src emacs-lisp :exports none
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;;; ha-passwords --- Emacs code to generate and store passwords. -*- lexical-binding: t; -*-
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;;
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;; © 2021-2023 Howard X. Abrams
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;; Licensed under a Creative Commons Attribution 4.0 International License.
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;; See http://creativecommons.org/licenses/by/4.0/
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;;
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;; Author: Howard X. Abrams <http://gitlab.com/howardabrams>
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;; Maintainer: Howard X. Abrams
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;; Created: January 11, 2021
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;;
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;; This file is not part of GNU Emacs.
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;;
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;; *NB:* Do not edit this file. Instead, edit the original literate file at:
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;; ~/other/hamacs/ha-passwords.org
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;; And tangle the file to recreate this one.
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;;
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;;; Code:
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#+end_src
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* Overlay Redaction
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Love [[https://xenodium.com/redact-that-buffer/][this idea]] for using a regular expression to /redact/ (or at least, obscure) sensitive information before screen sharing.
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#+begin_src emacs-lisp
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(defun toggle-redact-buffer (regexp)
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"Redact buffer content matching regexp. A space redacts all."
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(interactive (list (read-regexp "Text to Redact (Regexp)" 'regexp-history-last)))
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(let* ((redacted)
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(matches (let ((results '()))
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(when (string-empty-p regexp)
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(setq regexp "[[:graph:]]")
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(setq regexp-history-last regexp)
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(add-to-history 'regexp-history regexp))
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(save-excursion
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(goto-char (point-min))
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(while (re-search-forward regexp nil t)
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(push (cons (match-beginning 0) (match-end 0)) results)))
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(nreverse results))))
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(mapc (lambda (match)
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(dolist (overlay (overlays-in (car match) (cdr match)))
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(setq redacted t)
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(delete-overlay overlay))
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(unless redacted
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(overlay-put (make-overlay (car match) (cdr match))
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'display (make-string (- (cdr match) (car match)) ?x))))
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matches)))
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#+end_src
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I’m not sure how often I will use this, so I’m not putting it on a keybinding, also so, I will also not put a name-spacing prefix on the function.
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* Password Generation
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Let's assume that I store a bunch of words in data files:
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#+begin_src emacs-lisp
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(defvar ha-passwords-data-files (list (expand-file-name "adjectives.txt"
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(expand-file-name "data" hamacs-source-dir))
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(expand-file-name "colors.txt"
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(expand-file-name "data" hamacs-source-dir))
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(expand-file-name "nouns.txt"
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(expand-file-name "data" hamacs-source-dir)))
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"List of file name containing a data lines for our password generator. Order of these files matter.")
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(defvar ha-passwords-data nil
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"Contains a list of lists of words that we can choose.")
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#+end_src
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You can see where I'm going with this, can't you? Let's read them into list variables.
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#+begin_src emacs-lisp
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(defun ha-passwords--read-data-file (filename)
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(with-temp-buffer
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(insert-file-contents filename)
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(split-string (buffer-string) "\n" t)))
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#+end_src
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Now we get three or so words from our list of lists:
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#+begin_src emacs-lisp
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(defun ha-passwords-words ()
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(unless ha-passwords-data
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(setq ha-passwords-data
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(--map (ha-passwords--read-data-file it) ha-passwords-data-files)))
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(--map (nth (random (length it)) it) ha-passwords-data))
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#+end_src
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Let's make a password:
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#+begin_src emacs-lisp
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(defun ha-passwords-generate (&optional separator)
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(unless separator
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(setq separator "-"))
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(let* ((choices '("!" "@" "#" "$" "%" "^" "&" "*"))
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(choice (random (length choices)))
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(number (1+ choice)))
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(->> (ha-passwords-words)
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(s-join separator)
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(s-capitalize)
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(s-append (nth choice choices))
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(s-append (number-to-string number)))))
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#+end_src
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#+begin_src emacs-lisp
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(defun generate-password (&optional separator)
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(interactive)
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(let ((passphrase (ha-passwords-generate separator)))
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(kill-new passphrase)
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(message "Random password: %s" passphrase)))
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#+end_src
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* Keybindings
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Got make it easy to call:
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#+begin_src emacs-lisp
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(ha-leader "a g" '("generate passwd" . generate-password))
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#+end_src
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* Technical Artifacts :noexport:
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This will =provide= a code name, so that we can =require= this.
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#+begin_src emacs-lisp :exports none
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(provide 'ha-passwords)
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;;; ha-passwords.el ends here
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#+end_src
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#+description: A literate programming version for Emacs code to generate and store passwords.
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#+property: header-args:sh :tangle no
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#+property: header-args:emacs-lisp :tangle yes
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#+property: header-args :results none :eval no-export :comments no mkdirp yes
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#+options: num:nil toc:t todo:nil tasks:nil tags:nil date:nil
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#+options: skip:nil author:nil email:nil creator:nil timestamp:nil
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#+infojs_opt: view:nil toc:t ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
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