feat(emacs-pkgs/notable): Begin implementation by adding note-taking
I'm writing a note taking system because I don't like any of the existing ones. This adds a note-taking function which prompts the user for note content and persists it in a user-configurable directory. Next steps are roughly: * listing notes * editing notes * archiving notes At which point I would consider this functional. The idea is to keep adding incremental improvements that fit my workflows after that, and if it ends up being useful for anyone else - great. Change-Id: I7ae0eb4015511ebdbaeff92d8d32502726eb57c4 Reviewed-on: https://cl.tvl.fyi/c/depot/+/1981 Tested-by: BuildkiteCI Reviewed-by: tazjin <mail@tazj.in>
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tools/emacs-pkgs/notable/OWNERS
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tools/emacs-pkgs/notable/OWNERS
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owners:
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- tazjin
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tools/emacs-pkgs/notable/default.nix
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tools/emacs-pkgs/notable/default.nix
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{ pkgs, ... }:
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pkgs.emacsPackages.trivialBuild rec {
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pname = "notable";
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version = "1.0";
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src = ./notable.el;
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packageRequires = with pkgs.emacsPackages; [
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dash f ht s
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];
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}
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tools/emacs-pkgs/notable/notable.el
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tools/emacs-pkgs/notable/notable.el
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;;; notable.el --- a simple note-taking app -*- lexical-binding: t; -*-
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;;
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;; Copyright (C) 2020 The TVL Contributors
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;;
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;; Author: Vincent Ambo <mail@tazj.in>
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;; Version: 1.0
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;; Package-Requires: (cl-lib dash f rx s subr-x)
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;;
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;;; Commentary:
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;;
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;; This package provides a simple note-taking application which can be
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;; invoked from anywhere in Emacs, with several interactive
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;; note-taking functions included.
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;;
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;; As is tradition for my software, the idea here is to reduce
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;; friction which I see even with tools like `org-capture', because
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;; `org-mode' does a ton of things I don't care about.
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;;
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;; Notable stores its notes in simple JSON files in the folder
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;; specified by `notable-note-dir'.
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(require 'cl-lib)
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(require 'dash)
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(require 'f)
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(require 'ht)
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(require 'rx)
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(require 's)
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(require 'subr-x)
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;; User-facing customisation options
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(defgroup notable nil
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"Simple note-taking application."
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:group 'applications)
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;; TODO(tazjin): Use whatever the XDG state dir thing is for these by
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;; default.
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(defcustom notable-note-dir (expand-file-name "~/.notable/")
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"File path to the directory containing notable's notes."
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:type 'string
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:group 'notable)
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;; Package internal definitions
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(cl-defstruct (notable--note (:constructor notable--make-note))
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"Structure containing the fields of a single notable note."
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time ;; UNIX timestamp at which the note was taken
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content ;; Textual content of the note
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)
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(defvar notable--note-lock (make-mutex "notable-notes")
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"Exclusive lock for note operations with shared state.")
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(defvar notable--next-note
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(let ((next 0)
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(note-regexp (rx "note-"
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(group (one-or-more (any num)))
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".json")))
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(-each (f-entries notable-note-dir)
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(lambda (file)
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(when-let* ((match (string-match note-regexp file))
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(id (string-to-number
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(match-string 1 file)))
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(larger (> id next)))
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(setq next id))))
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(+ 1 next))
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"Next ID to use for notes. Initial value is determined based on
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the existing notes files.")
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(defun notable--serialize-note (note)
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"Serialise NOTE into JSON format."
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(check-type note notable--note)
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(json-serialize (ht ("time" (notable--note-time note))
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("content" (notable--note-content note)))))
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(defun notable--deserialize-note (json)
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"Deserialise JSON into a notable note."
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(check-type json string)
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(let ((parsed (json-parse-string json)))
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(unless (and (ht-contains? parsed "time")
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(ht-contains-p parsed "content"))
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(error "Missing required keys in note structure!"))
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(notable--make-note :time (ht-get parsed "time")
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:content (ht-get parsed "content"))))
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(defun notable--next-id ()
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"Return the next note ID and increment the counter."
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(with-mutex notable--note-lock
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(let ((id notable--next-note))
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(setq notable--next-note (+ 1 id))
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id)))
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(defun notable--add-note (content)
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"Add a note with CONTENT to the note store."
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(let* ((id (notable--next-id))
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(note (notable--make-note :time (time-convert nil 'integer)
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:content content))
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(path (f-join notable-note-dir (format "note-%d.json" id))))
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(when (f-exists? path) (error "Note file '%s' already exists!" path))
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(f-write-text (notable--serialize-note note) 'utf-8 path)
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(message "Saved note %d" id)))
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;; User-facing functions
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(defun notable-take-note (content)
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"Interactively prompt the user for a note that should be stored
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in Notable."
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(interactive "sEnter note: ")
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(check-type content string)
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(notable--add-note content))
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(provide 'notable)
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