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@@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. 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But first, please read +<https://www.gnu.org/licenses/why-not-lgpl.html>. diff --git a/thogai.el b/thogai.el new file mode 100644 index 0000000..7933ed1 --- /dev/null +++ b/thogai.el @@ -0,0 +1,425 @@ +;;; thogai.el --- Stenotyping software -*- lexical-binding: t -*- + +;; Stenotyping software for Emacs +;; Copyright (C) 2022 Arun Isaac +;; +;; Author: Arun Isaac <arunisaac@systemreboot.net> +;; Version: 0.1.0 +;; Keywords: abbrev, convenience, hardware +;; Homepage: https://git.systemreboot.net/thogai +;; Package-Requires: ((emacs "27.1")) + +;; This file is part of thogai. + +;; thogai is free software: you can redistribute it and/or modify it +;; under the terms of the GNU General Public License as published by +;; the Free Software Foundation, either version 3 of the License, or +;; (at your option) any later version. + +;; thogai is distributed in the hope that it will be useful, but +;; WITHOUT ANY WARRANTY; without even the implied warranty of +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;; General Public License for more details. + +;; You should have received a copy of the GNU General Public License +;; along with thogai. If not, see <http://www.gnu.org/licenses/>. + +;;; Commentary: +;; +;; thogai is stenotyping software. It interfaces with steno machines +;; using the Gemini protocol, and translates strokes using a steno +;; dictionary in the Plover dictionary format. +;; +;; Usage: +;; +;; Connect to your steno machine using the Gemini protocol with +;; +;; M-x thogai-connect +;; +;; Chord away! + +;;; Code: + +(require 'map) +(require 'pcase) +(require 'seq) +(require 'subr-x) +(require 'term) + +(defvar thogai-dictionary-files + (list "~/.config/plover/main.json" + "~/.config/plover/commands.json") + "List of dictionary files in order of increasing precedence. + +All files should be in the Plover dictionary format, and are read +and loaded into memory when `thogai-load-dictionaries' is run.") + +(defvar thogai-user-dictionary-alist + nil + "Additional dictionary entries. + +This is an association list specifying additional translations +not present in `thogai-dictionary-files'. For example, + +(setq thogai-user-dictionary-alist + '((\"PER\" . \"perfect\") + (\"THO/TKPWAOEU\" . \"thogai\")))") + +(defvar thogai-dictionary + (make-hash-table :test 'equal) + "Hash table used as the steno dictionary by thogai. + +This variable is loaded from files listed in +`thogai-dictionary-files' on running `thogai-load-dictionaries'.") + +(defvar thogai-stroke-ring-size + 1000 + "Size of `thogai-stroke-ring'. + +This is the number of past strokes thogai keeps track of. Among +other things, it affects the number of strokes one can undo back +to.") + +(defvar thogai-stroke-ring + (make-ring thogai-stroke-ring-size) + "Ring tracking all past strokes.") + +(defvar thogai-attach-next + nil + "Flag indicating whether to attach the next translation. + +If non-nil, the next part of the translation is attached without +a space, and the variable is reset to nil.") + +(defvar thogai-capitalize-next-word + nil + "Flag indicating whether to capitalize the next word. + +If non-nil, the first letter of the next word is capitalized and +the variable is reset to nil.") + +(defvar thogai-uncapitalize-next-word + nil + "Flag indicating whether to uncapitalize the next word. + +If non-nil, the first letter of the next word is uncapitalized +and the variable is reset to nil.") + +(defun thogai-load-dictionaries () + "Load dictionary files in THOGAI-DICTIONARY-FILES." + (interactive) + ;; Reset hash table. + (clrhash thogai-dictionary) + (let ((thogai-dictionary-longest-key 0)) + (dolist (dictionary-file thogai-dictionary-files) + (maphash (lambda (key value) + ;; Load key, value pair into hash table. + (puthash key value thogai-dictionary) + ;; Update length of longest key. + (setq thogai-dictionary-longest-key + (max thogai-dictionary-longest-key + (length (split-string key "/"))))) + ;; Parse JSON dictionary file. + (with-temp-buffer + (insert-file-contents dictionary-file) + (json-parse-buffer)))) + ;; Enlarge `thogai-stroke-ring' if it is too small. + (when (< (ring-size thogai-stroke-ring) + thogai-dictionary-longest-key) + (ring-resize thogai-stroke-ring thogai-dictionary-longest-key))) + (message "Loaded %d dictionary entries" + (hash-table-count thogai-dictionary))) + +(defun thogai-lookup (stroke) + "Lookup STROKE in dictionary. + +STROKE is looked up in `thogai-user-dictionary-alist' and +`thogai-dictionary' with `thogai-user-dictionary-alist' having +higher precedence. If STROKE is in neither, nil is returned." + (or (map-elt thogai-user-dictionary-alist stroke) + (map-elt thogai-dictionary stroke))) + +(defun thogai-longest-match (state) + "Return the longest sublist of STATE that maps to a stroke. + +STATE is a list of strokes, oldest first. STATE should typically +be the list of elements in `thogai-stroke-ring', or a subset +thereof." + (if (thogai-lookup (string-join state "/")) + state + (pcase state + (`(,_ . ,tail) + (thogai-longest-match tail))))) + +(defun thogai-delete (string) + "Delete STRING before point, if it is present. + +If STRING is not present before point, do nothing." + (let ((start (- (point) (length string))) + (end (point))) + (when (and (>= start (point-min)) + (string= (buffer-substring start end) + string)) + (delete-region start end)))) + +(defun thogai-compose (&rest functions) + "Return a composition of FUNCTIONS. + +The last function in FUNCTIONS is applied first." + (lambda (arg) + (seq-reduce (lambda (result function) + (funcall function result)) + functions + arg))) + +(defun thogai-insert-translation (translation &optional subtranslation) + "Insert TRANSLATION at point. + +TRANSLATION is a string mapped to in a steno dictionary. If +SUBTRANSLATION is non-nil, this is a recursive call. External +callers should never pass non-nil SUBTRANSLATION." + (pcase (save-match-data + (string-match (rx string-start (or (one-or-more (not ?{)) + (sequence ?{ (one-or-more (not ?{)) ?}))) + translation) + (list (match-string 0 translation) + (substring translation (match-end 0)))) + (`(,translation ,rest-of-translation) + (pcase translation + ;; Attach operator + ("{^}" + (setq thogai-attach-next t)) + ;; Prefix + ((pred (lambda (str) + (string-suffix-p "^}" str))) + (insert (string-remove-prefix "{" (string-remove-suffix "^}" translation))) + (setq thogai-attach-next t)) + ;; Capitalize next word. + ("{-|}" + (setq thogai-capitalize-next-word t)) + ;; Capitalize previous word. + ("{*-|}" + (save-excursion + (left-word) + (upcase-region (point) (1+ (point))))) + ;; Uncapitalize next word. + ("{>}" + (setq thogai-uncapitalize-next-word t)) + ;; Uncapitalize previous word. + ("{*>}" + (save-excursion + (left-word) + (downcase-region (point) (1+ (point))))) + ;; Retroactively delete space. + ("{*!}" + (save-excursion + (left-word) + (delete-char -1))) + ;; Simple literal translation + (_ + ;; Insert a space unless at the beginning of line. + (unless (or subtranslation + (= (line-beginning-position) + (point)) + thogai-attach-next) + (insert " ")) + ;; Reset `thogai-attach-next'. + (setq thogai-attach-next nil) + (insert (funcall (thogai-compose + ;; Capitalize first letter. + (if thogai-capitalize-next-word + (lambda (str) + (setq thogai-capitalize-next-word nil) + (concat (upcase (substring str 0 1)) + (substring str 1))) + 'identity) + ;; Uncapitalize first letter. + (if thogai-uncapitalize-next-word + (lambda (str) + (setq thogai-uncapitalize-next-word nil) + (concat (downcase (substring str 0 1)) + (substring str 1))) + 'identity)) + translation)))) + ;; Recurse for rest of translation. + (unless (string= rest-of-translation "") + (thogai-insert-translation rest-of-translation t))))) + +(defun thogai-reverse-strokes (strokes) + "Reverse the effects of STROKES. + +STROKES is a list of strokes, oldest first. `thogai-stroke-ring' +is unaltered." + (thogai-delete + (with-temp-buffer + (thogai-inject-strokes strokes (make-ring (length strokes))) + (buffer-string)))) + +(defun thogai-inject-strokes (strokes &optional stroke-ring) + "Inject STROKES into STROKE-RING. + +Inject STROKES, a list of strokes, into STROKE-RING as though +they were really stroked on the steno machine. If unspecified, +STROKE-RING is `thogai-stroke-ring'. The first element of +STROKES is injected first." + (let ((stroke-ring (or stroke-ring + thogai-stroke-ring))) + ;; Inject strokes one by one. + (dolist (stroke strokes) + (ring-insert stroke-ring stroke) + (thogai-insert-stroke stroke-ring)))) + +(defun thogai-insert-stroke (stroke-ring) + "Translate the most recent stroke and insert it at point. + +STROKE-RING is the ring representing the current state, and +should typically be `thogai-stroke-ring'." + (if (string= (ring-ref stroke-ring 0) "*") + ;; Special case to handle the undo operation + (progn + ;; Drop the "*" stroke from the state ring. + (ring-remove stroke-ring 0) + (let ((matched-strokes + (or (thogai-longest-match (reverse (ring-elements stroke-ring))) + (list (ring-ref stroke-ring 0))))) + ;; Reverse the previous group of strokes. + (thogai-reverse-strokes matched-strokes) + ;; Delete space before strokes unless we are at the + ;; beginning of the line. + (unless (= (line-beginning-position) + (point)) + (delete-char -1)) + ;; Re-insert the previous group of strokes except for the + ;; newest stroke. + (pcase (reverse matched-strokes) + (`(,_ . ,other-strokes) + (thogai-inject-strokes (reverse other-strokes) + (make-ring (length other-strokes)))))) + ;; Remove the newest stroke from the state ring. + (ring-remove stroke-ring 0)) + (let ((matched-strokes + (thogai-longest-match (reverse (ring-elements stroke-ring))))) + ;; Delete translation for earlier strokes that are captured by + ;; this translation. If no strokes were matched, skip this step. + (unless (null matched-strokes) + (thogai-reverse-strokes (butlast matched-strokes))) + ;; Insert literal stroke if it is not in the dictionary. Else, + ;; insert the actual translation. + (if (null matched-strokes) + (thogai-insert-translation (ring-ref stroke-ring 0)) + (thogai-insert-translation (thogai-lookup (string-join matched-strokes "/"))))))) + +(defun thogai-byte-to-bits (byte) + "Convert BYTE to a list of 8 bits. + +Each element of the returned list is a boolean, and the first +element is the most significant bit." + (seq-map (lambda (i) + (not (zerop (logand byte (lsh 1 i))))) + (number-sequence 7 0 -1))) + +(defun thogai-filter-mapn (function &rest sequences) + "Map FUNCTION over SEQUENCES and return only non-nil results. + +Map FUNCTION over all SEQUENCES using `seq-mapn', but return a +list of only the non-nil results." + (seq-filter 'identity + (apply 'seq-mapn function sequences))) + +(defun thogai-mapcatn (function &rest sequences) + "Map FUNCTION over SEQUENCES and concatenate the results. + +Map FUNCTION over all SEQUENCES using `seq-mapn', and concatenate +the results into a list." + (apply 'seq-concatenate 'list + (apply 'seq-mapn function sequences))) + +;; See +;; https://github.com/openstenoproject/plover/blob/master/plover/machine/geminipr.py +;; for protocol documentation. +(defun thogai-gemini-decode-stroke (bytes) + "Decode stroke represented by BYTES from the Gemini protocol. + +BYTES is a list of 6 bytes in the Gemini protocol." + (let* ((keys '(("Fn" "#1" "#2" "#3" "#4" "#5" "#6") + ("S1-" "S2-" "T-" "K-" "P-" "W-" "H-") + ("R-" "A-" "O-" "*1" "*2" "res1" "res2") + ("pwr" "*3" "*4" "-E" "-U" "-F" "-R") + ("-P" "-B" "-L" "-G" "-T" "-S" "-D") + ("#7" "#8" "#9" "#A" "#B" "#C" "-Z"))) + (pressed-keys + (thogai-mapcatn (lambda (byte keys) + (thogai-filter-mapn (lambda (selectp key) + (and selectp key)) + (seq-drop (thogai-byte-to-bits byte) + 1) + keys)) + bytes + keys))) + ;; NOTE: We recognize only a subset of keys supported by the + ;; Gemini protocol. For example, we recognize only a single S, not + ;; S1 and S2. + (let ((left (seq-mapcat (lambda (key) + (string-trim-right key (rx (one-or-more (or ?1 ?2 ?-))))) + (seq-filter (lambda (key) + (or (string= key "#1") + (and (not (member key (list "A-" "O-"))) + (string-suffix-p "-" key)))) + pressed-keys) + 'string)) + (vowel-or-star (seq-mapcat (lambda (key) + (string-trim key "-" (rx (or ?- ?1)))) + (seq-filter (lambda (key) + (member key (list "A-" "O-" "*1" "-E" "-U"))) + pressed-keys) + 'string)) + (right (seq-mapcat (lambda (key) + (string-remove-prefix "-" key)) + (seq-filter (lambda (key) + (and (not (member key (list "-E" "-U"))) + (string-prefix-p "-" key))) + pressed-keys) + 'string))) + (concat left + vowel-or-star + ;; Add hyphen if there is no vowel but there are + ;; right-side keys. + (if (and (string= vowel-or-star "") + (not (string= right ""))) + "-" + "") + right)))) + +(let ((bytes nil)) + (defun thogai-gemini-protocol-filter (process output) + "Process filter for the Gemini serial protocol." + (let ((bytes-per-stroke 6)) + (dolist (byte (string-to-list output)) + (push byte bytes) + ;; The Gemini protocol represents each stroke by 6 + ;; bytes. Decode stroke once 6 bytes are received. + (when (= (length bytes) bytes-per-stroke) + (let ((stroke (thogai-gemini-decode-stroke (reverse bytes)))) + ;; Log to paper tape. + (with-current-buffer (process-buffer process) + (insert stroke) + (insert "\n")) + ;; Insert into stroke ring, and process translation. + (ring-insert thogai-stroke-ring stroke) + (thogai-insert-stroke thogai-stroke-ring)) + (setq bytes nil)))))) + +(defun thogai-connect (port speed) + "Connect to steno machine at serial PORT with SPEED." + (interactive (list (serial-read-name) + (serial-read-speed))) + (make-serial-process :port port + :buffer "*thogai-paper-tape*" + :speed speed + :filter 'thogai-gemini-protocol-filter) + (message "Connected to steno machine at %s via the Gemini protocol" + port)) + +(provide 'thogai) + +;;; thogai.el ends here |