├── .gitignore
├── LICENSE
├── README.org
└── tracker-mode.el


/.gitignore:
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1 | *.elc


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/LICENSE:
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  1 |                     GNU GENERAL PUBLIC LICENSE
  2 |                        Version 3, 29 June 2007
  3 | 
  4 |  Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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669 |   The GNU General Public License does not permit incorporating your program
670 | into proprietary programs.  If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library.  If this is what you want to do, use the GNU Lesser General
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674 | <http://www.gnu.org/philosophy/why-not-lgpl.html>.
675 | 


--------------------------------------------------------------------------------
/README.org:
--------------------------------------------------------------------------------
  1 | #+TITLE: tracker-mode
  2 | #+DESCRIPTION: A tracker-inspired livecodable music sequencer for Emacs.
  3 | 
  4 | A tracker-inspired livecodable music sequencer for Emacs.
  5 | 
  6 | Inspired by Chun Lee's "[[http://www.youtube.com/watch?v=9YOigs1lYRY][etracker]]", which unfortunately doesn't seem to be available online.
  7 | 
  8 | Tracker-mode is a sequencer for Emacs loosely modelled after traditional trackers. At the moment, patterns can only have a single column, and each step in the sequence must be elisp code which is run on that step. Obviously since arbitrary code can be run on each step, the sky is theoretically the limit with what you can do, however writing raw elisp is perhaps not the fastest way to compose music. In the future I'd like to address both of these deficiencies to make tracker-mode faster and more fun to use.
  9 | 
 10 | * Installation
 11 | 
 12 | To install and load tracker-mode, run the following Elisp code (optionally adding them to your init.el as well).
 13 | 
 14 | Ensure the directory containing ~tracker-mode.el~ is in your ~load-path~:
 15 | 
 16 | #+begin_src elisp
 17 |   (add-to-list 'load-path "/path/to/tracker-mode/") ; replace this with the location you downloaded tracker-mode to.
 18 | #+end_src
 19 | 
 20 | Load tracker-mode:
 21 | 
 22 | #+begin_src elisp
 23 |   (require 'tracker-mode)
 24 | #+end_src
 25 | 
 26 | (Optional) Set the port that OSC messages should be sent to:
 27 | 
 28 | #+begin_src elisp
 29 |   (setq tracker-osc-port 4444)
 30 | #+end_src
 31 | 
 32 | (Optional) Define some convenience aliases. See the [[*Suggested Aliases]] section below for a way to make this easier.
 33 | 
 34 | * Usage
 35 | 
 36 | To start a new track, use ~M-x tracker~, which will create a new buffer and activate the mode.
 37 | 
 38 | Alternatively, if tracker-mode is loaded and you've previously saved a tracker-mode project with a ~.trk~ or ~.track~ file extension, simply opening the file will automatically start tracker-mode for that buffer.
 39 | 
 40 | To use the tracker, place the point at the end of a line beginning with three digits (i.e. ~000~). The point should be two spaces after the last digit. An easy way to make sure you're at the right position is to type ~C-a~, which is redefined in tracker-mode to move to the start of the step. Type your elisp code, and then when you're finished editing the step, press ~C-c C-c~ to confirm and apply your edits to the step.
 41 | 
 42 | To begin playing the sequence, press ~C-c C-s~. Continue editing more steps, ensuring you press ~C-c C-c~ to confirm each edit. When you're done, press ~C-c C-s~ again to stop.
 43 | 
 44 | You can use ~C-c C-i~ to insert a new pattern, and ~C-c C-d~ to delete the pattern under point. ~M-up~ and ~M-down~ will increase or decrease the number under the point. This is useful, for example, if you want to gradually increase the BPM without having to manually retype the number each time.
 45 | 
 46 | To actually generate sound, it's suggested to use Open Sound Control (OSC) to send messages to another program (or hardware that supports it). Tracker-mode includes convenience functions to make this easier:
 47 | 
 48 | # FIX: list them
 49 | 
 50 | If you're using SuperCollider, these functions might be even more convenient:
 51 | 
 52 | - ~tracker-sc-synth~
 53 | 
 54 | # FIX: list them
 55 | 
 56 | Emacs itself can play sound using the built-in ~play-sound-file~ function. However, this is not recommended for the following reasons:
 57 | 
 58 | - Emacs will completely lock up until the sound finishes playing (not even ~C-g~ works).
 59 | - Only certain formats of ~wav~ and ~au~ files are supported.
 60 | - Not all platforms are supported by this function.
 61 | 
 62 | ** Note
 63 | 
 64 | I've tried to make tracker-mode as robust as possible, so errors that occur in a step won't completely halt playback. However, it's still very easy to accidentally "break" playback by removing part of the "interface" (i.e. parts of the buffer that tracker-mode expects to find, such as the step numbers, BPM field, etc).
 65 | 
 66 | I intend to fix this in the future and make tracker-mode even more robust and fail-safe, but for now it's probably best to simply refrain from making those kinds of mistakes ;^]
 67 | 
 68 | * Suggested Aliases
 69 | Tracker-mode includes various convenience functions that may be useful for writing music with code. The standard names of these functions can be quite long, so you may want to define aliases for them to make composing music faster. This is especially handy if you're composing in real time as part of a performance (i.e. livecoding).
 70 | 
 71 | If you're feeling lazy, tracker-mode includes convenience functionality to manage these aliases for you.
 72 | 
 73 | # FIX: describe the mapping of the alist (i.e. symbol to definition, or the reverse?)
 74 | First, to see an alist of the suggested aliases that can be installed, run:
 75 | : (tracker-suggested-aliases)
 76 | 
 77 | If you don't know what a function does, you can of course use the standard ~C-h f~ binding to read its documentation.
 78 | 
 79 | ~tracker-install-suggested-aliases~ can be used to install or uninstall some or all of the suggested aliases. Note that this function will not overwrite existing functions or aliases.
 80 | 
 81 | To install all of the aliases (skipping any whose symbols are already defined):
 82 | : (tracker-install-suggested-aliases t)
 83 | 
 84 | To install some of the aliases (in this case, just the aliases ~rand~ and ~retrig~):
 85 | : (tracker-install-suggested-aliases 'rand 'retrig)
 86 | 
 87 | To uninstall all defined aliases:
 88 | : (tracker-install-suggested-aliases nil)
 89 | 
 90 | Of course, to make these aliases permanent, you can simply add one of the above lines to your init.el.
 91 | 
 92 | * Keys
 93 | 
 94 | - ~M-down~ - ~tracker-decrease-number~ - decreases the number under the point.
 95 | - ~M-up~ - ~tracker-increase-number~ - increases the number under the point.
 96 | - ~C-a~ - ~tracker-back-to-indent~ - moves your cursor back to the beginning of the line.
 97 | - ~C-c C-n~ - ~tracker-next-pattern~ - moves the point to the next pattern in the song.
 98 | - ~C-c C-p~ - ~tracker-previous-pattern~ - moves the point to the previous pattern in the song.
 99 | - ~C-c C-s~ - ~tracker-play-or-stop~ - starts or stops playing the song.
100 | - ~C-c C-l~ - ~tracker-latch-toggle~ - toggles "latching" the current pattern. while latched, the current pattern will be looped instead of proceeding to the next.
101 | - ~C-c C-i~ - ~tracker-insert-pattern~ - inserts a new pattern in the song after the current.
102 | - ~C-c C-c~ - ~tracker-confirm-step~ - confirms and applies the changes you've made to the current step, the BPM, track title, etc.
103 | - ~C-c C-k~ - ~tracker-revert-step~ - reverts the current step, undoing any changes you've made.
104 | - ~M-g b~ - ~tracker-goto-bpm~ - moves the point to the BPM field.
105 | - ~M-g s~ - ~tracker-goto-step~ - moves the point to the specified step in the current pattern.
106 | - ~M-g t~ - ~tracker-goto-title~ - moves the point to the title field.
107 | - ~M-g p~ - ~tracker-goto-pattern~ - jumps the point to the specified pattern.
108 | 
109 | * Future
110 | 
111 | - Implement latency to improve timing
112 | - Run the loop in its own thread rather than using timers
113 | - Make scheduling/timing mathematically exact
114 | - Implement OSC time tags (does osc.el support this?)
115 | - Look into ~tabulated-list-mode~ to see if it would work for tracker-mode.
116 | - Prevent Emacs' built-in comment functions from breaking the interface (i.e. how ~M-;~ will comment out the step number instead of just the code in that step).
117 | - Optionally hide the non-active patterns
118 | - "Scroll mode" function (shows up as "S" in the status field); automatically moves the point to the current row when the track is playing
119 | - "Follow mode" function (shows up as "F" in the status field); automatically switches currently viewed pattern when the track is playing
120 | - Pattern clone function
121 | - Pattern resize function
122 | - Keep the point on the same step (or the closest one to it) when switching patterns
123 | - User should not be able to delete interface elements
124 | - Implement "steps per beat"
125 | - Color each Nth line's numbers (000, 004, 008, 012, 016, etc, based on the number of steps per beat)
126 | - "Init" code: elisp that is run whenever the tracker starts to initialize variables/"loads" a song (after header but before patterns)
127 | - Ensure it's possible to run tracker-mode in multiple buffers simultaneously
128 | - Implement current step overlay (highlight the step number of the current step)
129 | - Add more convenience functions
130 |   - SuperCollider convenience functions
131 |   - Pure Data convenience functions
132 |   - ~retrig~ - re-executes the code a certain number of times with a delay.
133 | - Add functions to make to modifying parts of the sequence (i.e. to allow for "self-modifying" patterns).
134 | - Preprocess steps when confirming them
135 |   - Interpret vars prefixed with ~%~ (or another character maybe?) as pattern- and/or step-local.
136 | - Make a transient map (~set-transient-map~) for changing numbers more quickly, and then rebind ~tracker-{increase,decrease}-number~ to bindings less likely to clobber others.
137 | - Optional integration with cl-patterns/thundersnow (not completely sure what this would entail? maybe export as pattern/eseq/etc?).
138 | - MIDI support/convenience functions? I don't think Emacs has support for MIDI, but perhaps it could work to use [[http://krellan.com/amidicat/][amidicat]] like midimacs does...
139 | - Fix all the bugs marked with ~FIX~ in the code.
140 | 
141 | * Similar
142 | 
143 | Other projects that are related or similar.
144 | 
145 | - [[https://github.com/defaultxr/piano-mode][piano-mode]] - My work-in-progress minor mode that turns your computer keyboard into a musical keyboard similar to what some DAWs do. Note that this is in major need of an update, as it doesn't really work very well at the moment...
146 | 
147 | - [[https://github.com/defaultxr/cl-patterns][cl-patterns]] - My Common Lisp algorithmic pattern sequencing library. Much more advanced than tracker-mode and it includes a tracker-inspired pattern of its own called ~ptrack~.
148 | 
149 | - [[https://github.com/andreasjansson/midimacs][midimacs]] - A semi-algorithmic MIDI sequencer in Emacs Lisp.
150 | 
151 | - [[https://www.youtube.com/watch?v=9YOigs1lYRY][etracker]] - Chun Lee's Emacs tracker mode for sequencing OSC messages; a major inspiration for tracker-mode.
152 | 
153 | - [[https://emacsconf.org/2020/talks/35/][zmusic]] - A simple Emacs-based sequencer.
154 | 
155 | - [[https://github.com/jnykopp/emaccordion][emaccordion]] - Control Emacs with MIDI.
156 | 


--------------------------------------------------------------------------------
/tracker-mode.el:
--------------------------------------------------------------------------------
  1 | ;;; tracker-mode.el --- Tracker-inspired sequencer -*- lexical-binding: t -*-
  2 | 
  3 | ;; Copyright (C) 2012-2022 modula t.
  4 | 
  5 | ;; Author: modula t. <defaultxr at gmail dot com>
  6 | ;; Homepage: https://github.com/defaultxr/tracker-mode
  7 | ;; Version: 0.8
  8 | ;; Keywords: multimedia
  9 | ;; Package-Requires: ((osc "0.4") (emacs "25.1"))
 10 | 
 11 | ;; This file is not part of GNU Emacs.
 12 | 
 13 | ;;; License:
 14 | 
 15 | ;; Tracker-Mode is free software: you can redistribute it and/or modify
 16 | ;; it under the terms of the GNU General Public License as published by
 17 | ;; the Free Software Foundation, either version 3 of the License, or
 18 | ;; (at your option) any later version.
 19 | 
 20 | ;; Tracker-Mode is distributed in the hope that it will be useful,
 21 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
 22 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 23 | ;; GNU General Public License for more details.
 24 | 
 25 | ;; You should have received a copy of the GNU General Public License
 26 | ;; along with Tracker-Mode.  If not, see <http://www.gnu.org/licenses/>.
 27 | 
 28 | ;;; Commentary:
 29 | ;;
 30 | ;; This package provides a major mode for Emacs designed for music
 31 | ;; composition by way of a "tracker-like" interface. It is inspired by
 32 | ;; Chun Lee's "etracker", as well as software like Renoise, Furnace,
 33 | ;; and SunVox.
 34 | ;;
 35 | ;; A tracker is a sequencer used for making music.  In a tracker,
 36 | ;; musical data is typically represented as a grid of rows and
 37 | ;; columns.  Each column usually represents a separate instrument or
 38 | ;; channel, and each row represents a step in the sequence.
 39 | ;;
 40 | ;; Tracker-Mode can not (yet) handle multiple channels (columns)
 41 | ;; simultaneously, however it does have the ability to save multiple
 42 | ;; patterns and switch between them.
 43 | ;;
 44 | ;; Note that Tracker-Mode does not produce sound on its own, as it is
 45 | ;; just a sequencer that triggers synthesizers by sending Open Sound
 46 | ;; Control (OSC) messages. Right now only SuperCollider is being
 47 | ;; tested as its sound engine, but it should be possible to send to
 48 | ;; other synths as well with some minor hacking.
 49 | 
 50 | ;;; Code:
 51 | 
 52 | ;; FIX: C-a moves to the wrong location, it should jump to the start of the step under point but it goes to the previous step instead...
 53 | ;; FIX: reindent this for emacs' new indentation style (i.e. for "if"s)
 54 | 
 55 | ;;; load stuff
 56 | 
 57 | (require 'osc)
 58 | (require 'cl-lib)
 59 | 
 60 | ;;; custom
 61 | 
 62 | (defgroup tracker nil
 63 |   "Tracker-Mode."
 64 |   :group 'external
 65 |   :prefix "tracker-")
 66 | 
 67 | (defcustom tracker-osc-host "127.0.0.1"
 68 |   "The host that the synth process is running on."
 69 |   :type '(string)
 70 |   :group 'tracker)
 71 | 
 72 | (defcustom tracker-osc-port 57110
 73 |   "The port to send Tracker-Mode's OSC messages to."
 74 |   :type '(integer)
 75 |   :group 'tracker)
 76 | 
 77 | ;;; global variables
 78 | 
 79 | (defvar tracker-mode-hook nil
 80 |   "Hook to run when tracker mode starts.")
 81 | 
 82 | ;;; internal tracker variables + functions
 83 | 
 84 | (defvar tracker-title-regexp "^;+ T[Rr][Aa][Cc][Kk]: \\(.*\\)$"
 85 |   "The regexp used to match against the track's title line.")
 86 | 
 87 | (defvar tracker-bpm-regexp "^;+ BPM: \\([0-9]+\\)$"
 88 |   "The regexp used to match against the track's BPM line.")
 89 | 
 90 | (defvar tracker-pattern-regexp "^;+ Pattern \\([0-9]+\\):"
 91 |   "The regexp used to match against pattern headers.")
 92 | 
 93 | (defvar tracker-step-regexp "^\\([0-9][0-9][0-9]\\)\\(.\\) "
 94 |   "The regexp used to match against pattern steps.")
 95 | 
 96 | ;; there might be a better way to do this. it's only used when creating a new tracker-mode buffer
 97 | (defmacro tracker-without-undo (&rest body)
 98 |   "Perform BODY without modifying the buffer's undo list."
 99 |   `(progn
100 |      (buffer-disable-undo)
101 |      ,@body
102 |      (buffer-enable-undo)))
103 | 
104 | ;;; utility functions
105 | 
106 | (defun tracker-symbol-to-string (symbol)
107 |   "Convert SYMBOL to a string."
108 |   (downcase (string-trim-left (symbol-name symbol) ":")))
109 | 
110 | ;;; functions to move the point around
111 | 
112 | (defun tracker-goto-title ()
113 |   "Place the point at the end of the title field."
114 |   (interactive)
115 |   (goto-char (point-min))
116 |   (search-forward-regexp tracker-title-regexp)
117 |   (end-of-line))
118 | 
119 | (defun tracker-goto-step (step &optional pattern)
120 |   "Place the point at the start of STEP in PATTERN (or the current
121 | if none specified)."
122 |   (interactive "NStep: ")
123 |   (tracker-goto-pattern (or pattern (tracker-pattern-at-point)))
124 |   (search-forward-regexp (format "^%03d. " step)))
125 | 
126 | (defun tracker-goto-bpm ()
127 |   "Place the point at the end of the BPM field."
128 |   (interactive)
129 |   (goto-char (point-min))
130 |   (search-forward-regexp tracker-bpm-regexp))
131 | 
132 | (defun tracker-goto-currently-viewed-pattern ()
133 |   "Place the point at the beginning of the current pattern field."
134 |   (interactive)
135 |   (tracker-goto-pattern (tracker-pattern-at-point)))
136 | 
137 | (defun tracker-goto-currently-playing-pattern ()
138 |   "Place the point at the beginning of the currently-playing pattern."
139 |   (interactive)
140 |   (tracker-goto-pattern (tracker-playing-pattern)))
141 | 
142 | (defun tracker-goto-scratch () ; FIX: reimplement scratch
143 |   "Place the point at the beginning of the scratch field."
144 |   (interactive)
145 |   (goto-char (point-min))
146 |   (search-forward-regexp "^;; Scratch:")
147 |   (forward-char))
148 | 
149 | (defun tracker-goto-end-of-pattern (&optional pattern)
150 |   "Place the point at the end of PATTERN."
151 |   (goto-char (second (tracker-step-bounds (1- (tracker-steps-count)) pattern))))
152 | 
153 | (defun tracker-goto-playing-step ()
154 |   "Place the point at the beginning of the currently-playing step."
155 |   (interactive)
156 |   (tracker-goto-step tracker-current-playing-step tracker-current-playing-pattern))
157 | 
158 | (defun tracker-goto-pattern (&optional pattern)
159 |   "Place the point at the end of PATTERN's header line, or return
160 | nil if PATTERN could not be found."
161 |   (interactive "NPattern: ")
162 |   (goto-char (point-min))
163 |   (let ((pattern (or pattern (tracker-pattern-at-point))))
164 |     (and (search-forward (concat ";; Pattern " (number-to-string pattern) ":\n") nil t)
165 |          (backward-char))))
166 | 
167 | (defun tracker-goto-next-pattern (&optional num wrap)
168 |   "Move point to the next pattern."
169 |   (interactive "p")
170 |   (let* ((num (or num 1))
171 |          (desired (+ num (or (tracker-pattern-at-point) 0))))
172 |     (if wrap
173 |         (tracker-goto-pattern (mod desired (tracker-patterns-count)))
174 |         (cond ((>= desired (tracker-patterns-count))
175 |                (goto-char (point-max)))
176 |               ((< desired 0)
177 |                (goto-char (point-min)))
178 |               (t
179 |                (tracker-goto-pattern desired))))))
180 | 
181 | (defun tracker-goto-previous-pattern (&optional num wrap)
182 |   "Move point to the previous pattern."
183 |   (interactive "p")
184 |   (when wrap
185 |     (warn "The WRAP argument is not yet implemented.")) ; FIX: implement
186 |   (let ((num (or num 1)))
187 |     (tracker-goto-next-pattern (- num))))
188 | 
189 | ;;; functions to get data
190 | 
191 | (defun tracker-patterns ()
192 |   "Get a list of the pattern numbers in the current buffer."
193 |   (let (res)
194 |     (save-excursion
195 |       (goto-char (point-min))
196 |       (while (search-forward-regexp tracker-pattern-regexp nil t)
197 |         (push (string-to-number (match-string-no-properties 1)) res)))
198 |     (nreverse res)))
199 | 
200 | (defun tracker-patterns-count ()
201 |   "Get the total number of patterns in the buffer."
202 |   (save-excursion
203 |     (goto-char (point-min))
204 |     (count-matches tracker-pattern-regexp)))
205 | 
206 | (defun tracker-pattern-at-point ()
207 |   "Get the number of the pattern that the point is in, or nil if none."
208 |   (save-excursion
209 |     (when (search-backward-regexp tracker-pattern-regexp nil t)
210 |       (string-to-number (match-string 1)))))
211 | 
212 | (defun tracker-pattern-steps (&optional pattern)
213 |   "Get a list of the step numbers in PATTERN."
214 |   (let ((pattern (or pattern
215 |                      (tracker-pattern-at-point)
216 |                      0))
217 |         res)
218 |     (save-excursion
219 |       (let ((pattern-end (progn
220 |                            (tracker-goto-end-of-pattern)
221 |                            (point))))
222 |         (tracker-goto-pattern pattern)
223 |         (while (search-forward-regexp tracker-step-regexp pattern-end t)
224 |           (push (string-to-number (match-string-no-properties 1)) res))))
225 |     (nreverse res)))
226 | 
227 | (defun tracker-steps-count (&optional pattern)
228 |   "Get the number of steps in PATTERN."
229 |   (when-let ((pattern (or pattern (tracker-pattern-at-point))))
230 |     (save-excursion
231 |       (tracker-goto-pattern pattern)
232 |       (count-matches tracker-step-regexp
233 |                      (point)
234 |                      (save-excursion
235 |                        (or (when (search-forward-regexp tracker-pattern-regexp nil t)
236 |                              (beginning-of-line)
237 |                              (point))
238 |                            (point-max)))))))
239 | 
240 | (defun tracker-step-at-point ()
241 |   "Get the step number that the point is on, or nil if the point is
242 | not located on a step."
243 |   (when-let ((pattern (tracker-pattern-at-point)))
244 |     (when (save-excursion
245 |             (search-backward (concat ";; Pattern " (number-to-string pattern) ":\n") nil t))
246 |       (save-excursion
247 |         (when (search-backward-regexp tracker-step-regexp nil t)
248 |           (string-to-number (buffer-substring (point) (+ 3 (point)))))))))
249 | 
250 | (defvar tracker-playing-p nil
251 |   "True if the tracker is currently playing, or nil if it is stopped.")
252 | 
253 | (make-variable-buffer-local 'tracker-playing-p)
254 | (set-default 'tracker-playing-p nil)
255 | 
256 | (defun tracker-playing-pattern ()
257 |   "Get the number of the currently-playing pattern."
258 |   tracker-current-playing-pattern)
259 | 
260 | (defvar tracker-latched-p nil
261 |   "True if the tracker should loop only its current pattern when playing.")
262 | 
263 | (make-variable-buffer-local 'tracker-latched-p)
264 | (set-default 'tracker-latched-p nil)
265 | 
266 | (make-variable-buffer-local 'tracker-bpm)
267 | (set-default 'tracker-bpm 120)
268 | 
269 | (defun tracker-bpm ()
270 |   "Get the confirmed BPM of the track."
271 |   tracker-bpm)
272 | 
273 | (defun tracker-listed-bpm ()
274 |   "Get the BPM listed in the track."
275 |   (save-excursion
276 |     (string-to-number (buffer-substring-no-properties
277 |                        (tracker-goto-bpm)
278 |                        (1- (search-forward " "))))))
279 | 
280 | (defun tracker-tempo ()
281 |   "Get the tracker tempo as beats per second."
282 |   (/ (tracker-bpm) 60))
283 | 
284 | (make-variable-buffer-local 'tracker-track-name)
285 | (set-default 'tracker-track-name "")
286 | 
287 | (defun tracker-track-name ()
288 |   "Get the confirmed track name of the track."
289 |   tracker-track-name)
290 | 
291 | ;;; interface code
292 | 
293 | (defun tracker-buffer-p (&optional buffer)
294 |   "True if BUFFER looks like a `tracker-mode' buffer."
295 |   (save-excursion
296 |     (with-current-buffer (or buffer (current-buffer))
297 |       (goto-char (point-min))
298 |       (and (looking-at tracker-title-regexp)
299 |            (progn
300 |              (forward-line 1)
301 |              (looking-at tracker-bpm-regexp))))))
302 | 
303 | (defvar tracker-modifying-buffer-p nil
304 |   "True if tracker-mode is modifying the buffer and
305 | `tracker-after-change-function' should ignore changes.")
306 | 
307 | (make-variable-buffer-local 'tracker-modifying-buffer-p)
308 | (set-default 'tracker-modifying-buffer-p nil)
309 | 
310 | (defmacro tracker-modifying-buffer (&rest body)
311 |   "Run BODY with variables set to allow modifications to the
312 | tracker-mode template/UI elements."
313 |   `(let ((tracker-modifying-buffer-p t)
314 |          (inhibit-read-only t))
315 |      ,@body))
316 | 
317 | (defun tracker-ui-element (start end &optional ro-message additional-properties)
318 |   "Write a tracker interface element to the current buffer, at point."
319 |   (let ((intangible (cl-getf additional-properties additional-properties (gensym)))
320 |         (props `(read-only ,(or ro-message "Cannot edit tracker-mode template") ,@additional-properties)))
321 |     (set-text-properties start (+ start 1) (cl-list* 'cursor-intangible intangible props))
322 |     (set-text-properties (+ start 1) (- end 1) (cl-list* 'cursor-intangible intangible props))
323 |     (set-text-properties (- end 1) end (cl-list* 'rear-nonsticky t props))))
324 | 
325 | (defun tracker-add-ui-element (text &optional ro-message additional-properties)
326 |   "Search for TEXT, and if it exists, propertize it as a UI
327 | element. If it does not exist, insert it as a UI element. Returns
328 | t if the text was inserted, or nil if it was already there."
329 |   (let* ((inserted nil)
330 |          (end (save-excursion (if (search-forward text nil t)
331 |                                   (point)
332 |                                   (progn
333 |                                     (insert text)
334 |                                     (setq inserted t)
335 |                                     (point))))))
336 |     (tracker-ui-element (- end (length text)) end ro-message additional-properties)
337 |     (goto-char end)
338 |     inserted))
339 | 
340 | (defun tracker-propertize-patterns ()
341 |   "Find all patterns in the buffer and ensure their UI elements are
342 | correctly propertized.
343 | 
344 | See also: `tracker-insert-pattern', `tracker-write-template'"
345 |   (save-excursion
346 |     (goto-char (point-min))
347 |     (while (search-forward-regexp "^;; Pattern [0-9]+:$" nil t)
348 |       (tracker-ui-element (save-excursion
349 |                             (beginning-of-line)
350 |                             (1- (point)))
351 |                           (point)
352 |                           "Cannot edit tracker-mode template; use `tracker-delete-pattern' to delete patterns")
353 |       (let ((pattern-end (save-excursion
354 |                            (tracker-goto-end-of-pattern)
355 |                            (point))))
356 |         (while (search-forward-regexp "^[0-9][0-9][0-9].." pattern-end t)
357 |           (tracker-ui-element (save-excursion
358 |                                 (beginning-of-line)
359 |                                 (1- (point)))
360 |                               (point)
361 |                               "Cannot edit step markers; use `tracker-resize-pattern' to change the number of steps in a pattern"))))))
362 | 
363 | (defun tracker-write-template ()
364 |   "Write the default template for the tracker, or propertize it if
365 | it already exists."
366 |   (tracker-modifying-buffer
367 |    (tracker-without-undo
368 |     (save-excursion
369 |       (goto-char (point-min))
370 |       (when (and (/= (point-min) (point-max))
371 |                  (not (tracker-buffer-p)))
372 |         (error "This does not appear to be a tracker-mode-formatted buffer. Try M-x tracker to create and initialize a new tracker-mode buffer"))
373 |       (when (tracker-add-ui-element ";; Track: ")
374 |         (insert "Untitled"))
375 |       (when (tracker-add-ui-element "\n;; BPM: ")
376 |         (insert "120\n\n"))
377 |       (goto-char (point-min))
378 |       (if (search-forward-regexp tracker-pattern-regexp nil t)
379 |           (tracker-propertize-patterns)
380 |           (tracker-insert-pattern 16))))))
381 | 
382 | (defface tracker-header-heading-face
383 |   '((t :inherit font-lock-keyword-face))
384 |   "Face used to highlight header headings."
385 |   :group 'tracker)
386 | 
387 | (defun tracker-update-header ()
388 |   "Update the header line of the tracker buffer."
389 |   (cl-flet ((heading (string &optional help-echo)
390 |               (apply 'propertize string
391 |                      'face 'tracker-header-heading-face
392 |                      (when help-echo
393 |                        (list 'help-echo help-echo)))))
394 |     (setf header-line-format (concat (heading "Track:" "The name of the track.")
395 |                                      " "
396 |                                      (tracker-track-name)
397 |                                      " "
398 |                                      (heading "BPM:" "Current tempo in beats per minute.")
399 |                                      " "
400 |                                      (number-to-string (tracker-bpm))
401 |                                      " "
402 |                                      (heading (if tracker-playing-p "▶" "⏹")
403 |                                               (concat "Transport status: "
404 |                                                       (if tracker-playing-p "playing" "stopped")
405 |                                                       "."))
406 |                                      (heading (if tracker-latched-p "L" " ")
407 |                                               (if tracker-latched-p
408 |                                                   "Latch on."
409 |                                                   "Latch off."))
410 |                                      " "
411 |                                      (heading "Pattern:" "Currently-playing pattern.")
412 |                                      " "
413 |                                      (when tracker-current-playing-pattern
414 |                                        (number-to-string tracker-current-playing-pattern))
415 |                                      " "
416 |                                      (heading "Step:" "Currently-playing step.")
417 |                                      " "
418 |                                      (when tracker-current-playing-step
419 |                                        (number-to-string tracker-current-playing-step)))))
420 |   (force-mode-line-update))
421 | 
422 | (defun tracker-point-in-step-field-p ()
423 |   "True when point is inside a step field."
424 |   (and (tracker-step-at-point)
425 |        (>= (current-column) 5)))
426 | 
427 | (defun tracker-after-change-function (start end length)
428 |   "Mark the associated step as modified after the buffer is modified."
429 |   (ignore end length)
430 |   (unless tracker-modifying-buffer-p
431 |     (save-excursion
432 |       (goto-char start)
433 |       (when (tracker-point-in-step-field-p)
434 |         (when-let ((pattern (tracker-pattern-at-point))
435 |                    (step (tracker-step-at-point)))
436 |           (tracker-mark-step step pattern 'modified))))))
437 | 
438 | (defun tracker-mark-step (step pattern type)
439 |   "Mark STEP in PATTERN as modified (M), erroring (E), or
440 | confirmed (blank). TYPE should be either \\='error, \\='modified,
441 | or \\='confirmed."
442 |   (unless (eql type 'modified)
443 |     (buffer-disable-undo))
444 |   (tracker-modifying-buffer
445 |    (save-excursion
446 |      (when (tracker-goto-step step pattern)
447 |        (beginning-of-line)
448 |        (forward-char 3)
449 |        (delete-char 1)
450 |        (insert (cl-case type
451 |                  (error "E")
452 |                  (modified "M")
453 |                  (confirmed " "))))))
454 |   (unless (eql type 'modified)
455 |     (buffer-enable-undo)))
456 | 
457 | (defvar tracker-confirmed-steps nil
458 |   "The hash table mapping pattern and step numbers to the code for that step.")
459 | 
460 | (make-variable-buffer-local 'tracker-confirmed-steps)
461 | (set-default 'tracker-confirmed-steps nil)
462 | 
463 | (defun tracker-make-confirmed-steps-hash ()
464 |   "Create the `tracker-confirmed-steps' hash table."
465 |   (setf tracker-confirmed-steps (make-hash-table :test 'equal)))
466 | 
467 | (defun tracker-step-id (step pattern &optional key)
468 |   "Get a key for the `tracker-confirmed-steps' hash to access STEP
469 | in PATTERN. KEY, if provided, specifies a different datum about
470 | the step, for example \\='string is the step as an unparsed
471 | string."
472 |   (list pattern step key))
473 | 
474 | (defun tracker-confirmed-step (step pattern &optional key)
475 |   "Get the confirmed step STEP in PATTERN from the
476 | `tracker-confirmed-steps' hash. KEY, if provided, specifies a
477 | different datum about the step, for example \\='string is the
478 | step as an unparsed string."
479 |   (gethash (tracker-step-id step pattern key) tracker-confirmed-steps))
480 | 
481 | (defun tracker-confirmed-step-set (code step pattern &optional key)
482 |   (when key
483 |     (error "KEY is not supported when setting `tracker-confirmed-step'"))
484 |   (let ((code (if (string= "" code)
485 |                   "nil"
486 |                   code)))
487 |     (puthash (tracker-step-id step pattern)
488 |              (eval `(lambda () ,(read code)))
489 |              tracker-confirmed-steps)
490 |     (puthash (tracker-step-id step pattern 'string)
491 |              code
492 |              tracker-confirmed-steps)))
493 | 
494 | (gv-define-setter tracker-confirmed-step (code step pattern &optional key)
495 |   `(tracker-confirmed-step-set ,code ,step ,pattern ,key))
496 | 
497 | ;;; main loop and associated stuff
498 | 
499 | (defun tracker-next-step-delay (bpm)
500 |   "Convert a BPM into the interval between each 16th note."
501 |   (/ (/ 60 (float bpm)) 4))
502 | 
503 | (defvar tracker-current-playing-pattern nil
504 |   "The currently-playing pattern number.")
505 | 
506 | (make-variable-buffer-local 'tracker-current-playing-pattern)
507 | (set-default 'tracker-current-playing-pattern nil)
508 | 
509 | (defvar tracker-current-playing-step nil
510 |   "The currently-playing step number.")
511 | 
512 | (make-variable-buffer-local 'tracker-current-playing-step)
513 | (set-default 'tracker-current-playing-step nil)
514 | 
515 | (defun tracker-step (step pattern &optional buffer)
516 |   "Play STEP of PATTERN in BUFFER."
517 |   (let ((buffer (or buffer (current-buffer))))
518 |     (with-current-buffer buffer
519 |       (setf tracker-current-playing-step step
520 |             tracker-current-playing-pattern pattern)
521 |       (when-let ((c-step (tracker-confirmed-step step pattern)))
522 |         (condition-case err (funcall c-step)
523 |           (error
524 |            (message "Tracker got a %s when attempting to run step %d in pattern %d." ; FIX: improve error reporting
525 |                     (car err) step pattern)
526 |            (tracker-mark-step step pattern 'error))))
527 |       (tracker-update-header))))
528 | 
529 | (defun tracker-loop (step pattern buffer)
530 |   "The main loop of the tracker; play STEP in PATTERN in BUFFER with
531 | `tracker-step', then queue the next iteration of the loop.
532 | 
533 | Note that this is an \"internal\" function; users should
534 | start/stop the tracker with `tracker-play-or-stop' (bound to C-c
535 | C-s by default) instead."
536 |   (when (buffer-live-p buffer)
537 |     (with-current-buffer buffer
538 |       (when tracker-playing-p
539 |         (save-excursion
540 |           (tracker-step step pattern buffer)
541 |           (let* ((delay (tracker-next-step-delay (tracker-bpm)))
542 |                  (next-step (or (cadr (member step (tracker-pattern-steps)))
543 |                                 0))
544 |                  (next-pattern (if (or tracker-latched-p
545 |                                        (not (eql next-step 0)))
546 |                                    pattern
547 |                                    (mod (1+ pattern) (tracker-patterns-count)))))
548 |             (run-with-timer delay nil 'tracker-loop next-step next-pattern buffer)))))))
549 | 
550 | ;;; pattern editing
551 | 
552 | (defun tracker-insert-steps (steps &optional start)
553 |   "Insert STEPS additional steps at point, numbered starting at START."
554 |   (let ((start (or start 0)))
555 |     (dotimes (step steps)
556 |       (insert (format "%03d  \n" (+ start step)))
557 |       (tracker-ui-element (- (point) 7) (1- (point)) "Cannot edit step markers; use `tracker-resize-pattern' to change the number of steps in a pattern"))))
558 | 
559 | (defun tracker-insert-pattern (&optional size) ; FIX: this inserts after the current pattern, but the pattern number is wrong if it's not the last pattern in the buffer
560 |   "Insert a new pattern after the current one containing SIZE steps."
561 |   (interactive
562 |    (if (and current-prefix-arg (not (consp current-prefix-arg)))
563 |        (list (prefix-numeric-value current-prefix-arg))
564 |        (list (read-number "Number of steps: " 16))))
565 |   (let ((inhibit-read-only t)
566 |         (number (tracker-patterns-count)))
567 |     (save-excursion
568 |       (if (= 0 (tracker-patterns-count))
569 |           (goto-char (point-max))
570 |           (tracker-goto-end-of-pattern))
571 |       (or (search-forward "\n\n" nil t)
572 |           (progn
573 |             (ignore-errors (forward-char 2))
574 |             (unless (bolp)
575 |               (insert "\n\n"))))
576 |       (let ((start (point)))
577 |         (insert (concat ";; Pattern " (number-to-string number) ":\n"))
578 |         (tracker-ui-element (- start 1) (point) "Cannot edit tracker-mode template; use `tracker-delete-pattern' to delete patterns"))
579 |       (tracker-insert-steps size)
580 |       (insert "\n"))))
581 | 
582 | (defun tracker-delete-pattern ()
583 |   "Delete the pattern under point."
584 |   (interactive)
585 |   (if-let ((pattern (tracker-pattern-at-point)))
586 |       (progn
587 |         (dolist (step (tracker-pattern-steps pattern))
588 |           (remhash (tracker-step-id step pattern) tracker-confirmed-steps))
589 |         (save-excursion
590 |           (delete-region (save-excursion
591 |                            (search-backward-regexp tracker-pattern-regexp nil t)
592 |                            (point))
593 |                          (save-excursion
594 |                            (search-forward-regexp tracker-pattern-regexp nil t)
595 |                            (beginning-of-line)
596 |                            (point)))))
597 |     (message "The point does not appear to be in a pattern.")))
598 | 
599 | (defun tracker-resize-pattern (steps)
600 |   "Add or remove steps to the pattern under point to make it STEPS steps in length."
601 |   (interactive "NSteps? ")
602 |   (let ((current-num-steps (tracker-steps-count)))
603 |     (tracker-modifying-buffer
604 |      (if (> steps current-num-steps)
605 |          (progn
606 |            (tracker-goto-end-of-pattern)
607 |            (search-forward "\n" nil t)
608 |            (unless (bolp)
609 |              (end-of-line)
610 |              (insert "\n"))
611 |            (tracker-insert-steps (- steps current-num-steps) current-num-steps))
612 |          (delete-region (save-excursion
613 |                           (tracker-goto-step steps)
614 |                           (beginning-of-line)
615 |                           (1- (point)))
616 |                         (save-excursion
617 |                           (tracker-goto-end-of-pattern)
618 |                           (point)))))))
619 | 
620 | (defun tracker-latch (&optional enable)
621 |   "Turn on or off latching of the currently-playing pattern. ENABLE
622 | should be t or a positive number to turn on, or nil or a
623 | non-positive number to turn off.
624 | 
625 | See also: `tracker-latch-toggle'"
626 |   (interactive "p")
627 |   (setf tracker-latched-p (if (booleanp enable)
628 |                               enable
629 |                               (> enable 0)))
630 |   (tracker-update-header)
631 |   (message (if tracker-latched-p
632 |                (concat "Latched pattern " (number-to-string tracker-current-playing-pattern) ".")
633 |                "Tracker unlatched.")))
634 | 
635 | (defun tracker-latch-toggle ()
636 |   "Toggle whether to loop the current pattern."
637 |   (interactive)
638 |   (tracker-latch (not tracker-latched-p)))
639 | 
640 | ;;; steps
641 | 
642 | (defun tracker-step-bounds (&optional step pattern)
643 |   "Get the bounds of the current text in STEP of PATTERN."
644 |   (save-excursion
645 |     (let ((start (progn
646 |                    (tracker-goto-step (or step (tracker-step-at-point)) (or pattern (tracker-pattern-at-point)))
647 |                    (point))))
648 |       (list
649 |        start
650 |        (let ((next-pat-pos (save-excursion
651 |                              (if (search-forward-regexp tracker-pattern-regexp nil t)
652 |                                  (progn
653 |                                    (beginning-of-line)
654 |                                    (point))
655 |                                  (point-max)))))
656 |          (max start
657 |               (or (when (search-forward-regexp tracker-step-regexp next-pat-pos t)
658 |                     (backward-sexp 2)
659 |                     (forward-sexp)
660 |                     (point))
661 |                   (save-excursion
662 |                     (goto-char next-pat-pos)
663 |                     (backward-sexp)
664 |                     (forward-sexp)
665 |                     (point)))))))))
666 | 
667 | (defun tracker-step-string (&optional step pattern)
668 |   "Get the code from STEP in PATTERN as a string."
669 |   (apply #'buffer-substring-no-properties (tracker-step-bounds step pattern)))
670 | 
671 | (defun tracker-confirm-step ()
672 |   "Confirm edits to the current step."
673 |   (interactive)
674 |   (save-excursion
675 |     (if-let ((step (tracker-step-at-point)))
676 |         (let* ((pattern (tracker-pattern-at-point))
677 |                (elisp (tracker-step-string step pattern)))
678 |           (setf (tracker-confirmed-step step pattern) elisp)
679 |           (tracker-mark-step step pattern 'confirmed))
680 |       (progn
681 |         (beginning-of-line)
682 |         (cond ((looking-at tracker-title-regexp)
683 |                (setf tracker-track-name (match-string-no-properties 1))
684 |                (tracker-update-header))
685 |               ((looking-at tracker-bpm-regexp)
686 |                (setf tracker-bpm (string-to-number (match-string-no-properties 1)))
687 |                (tracker-update-header))
688 |               (t
689 |                (message "The point does not appear to be on a step.")))))))
690 | 
691 | (defun tracker-revert-step (&optional step pattern)
692 |   "Undo edits to STEP in PATTERN, reverting back to its last confirmed code."
693 |   (interactive)
694 |   (let ((step (or step (tracker-step-at-point)))
695 |         (pattern (or pattern (tracker-pattern-at-point))))
696 |     (apply #'delete-region (tracker-step-bounds step pattern))
697 |     (tracker-goto-step step pattern)
698 |     (insert (or (tracker-confirmed-step step pattern 'string) ""))
699 |     (tracker-mark-step step pattern 'confirmed)))
700 | 
701 | ;;; transport
702 | 
703 | (defun tracker-play ()
704 |   "Start playing the tracker."
705 |   (interactive)
706 |   (setf tracker-playing-p t)
707 |   (tracker-loop 0 (or (tracker-pattern-at-point) 0) (current-buffer))
708 |   (message "Tracker started."))
709 | 
710 | (defun tracker-stop ()
711 |   "Stop playing the tracker."
712 |   (interactive)
713 |   (setf tracker-playing-p nil)
714 |   (message "Tracker stopped.")
715 |   (tracker-update-header))
716 | 
717 | (defun tracker-play-or-stop ()
718 |   "Play the tracker if it is stopped, or stop it if it is playing."
719 |   (interactive)
720 |   (if tracker-playing-p
721 |       (tracker-stop)
722 |       (tracker-play)))
723 | 
724 | ;;; change numbers
725 | 
726 | ;; FIX: should this function automatically re-confirm the step after being run?
727 | (defun tracker-change-number (change)
728 |   "Increase or decrease a number under the point by CHANGE."
729 |   (interactive "p")
730 |   (save-excursion
731 |     (search-backward-regexp "[^0-9-]")
732 |     (forward-char)
733 |     (let* ((start (point))
734 |            (end (1- (save-excursion (search-forward-regexp "[^0-9-]"))))
735 |            (string (buffer-substring-no-properties start end)))
736 |       (unless (eql 0 (- end start))
737 |         (delete-char (- end start))
738 |         (insert (number-to-string (+ (or change 1) (string-to-number string))))))))
739 | 
740 | (defun tracker-increase-number (&optional increase)
741 |   "Increase the number under the point by INCREASE."
742 |   (interactive "p")
743 |   (tracker-change-number (or increase 1)))
744 | 
745 | (defun tracker-decrease-number (&optional decrease)
746 |   "Decrease the number under the point by DECREASE."
747 |   (interactive "p")
748 |   (tracker-change-number (- (or decrease 1))))
749 | 
750 | (defun tracker-back-to-indent ()
751 |   "Move point back to the beginning of the line, skipping forward to
752 | the start of the step input if on a step."
753 |   (interactive)
754 |   (beginning-of-line)
755 |   (when (looking-at tracker-step-regexp)
756 |     (forward-char 5)))
757 | 
758 | 
759 | ;;; keymap
760 | 
761 | (defvar tracker-mode-map
762 |   (let ((map (make-sparse-keymap "Tracker-Mode")))
763 |     (define-key map (kbd "<M-down>") 'tracker-decrease-number)
764 |     (define-key map (kbd "<M-up>") 'tracker-increase-number)
765 |     (define-key map (kbd "C-c C-n") 'tracker-goto-next-pattern)
766 |     (define-key map (kbd "C-c C-p") 'tracker-goto-previous-pattern)
767 |     ;; (define-key map (kbd "M-n") 'tracker-next-field) ; goes to next step in the pattern, etc
768 |     ;; (define-key map (kbd "M-p") 'tracker-previous-field)
769 |     (define-key map (kbd "C-c C-s") 'tracker-play-or-stop)
770 |     (define-key map (kbd "C-c C-l") 'tracker-latch-toggle)
771 |     (define-key map (kbd "C-c C-i") 'tracker-insert-pattern)
772 |     (define-key map (kbd "C-c C-d") 'tracker-delete-pattern)
773 |     (define-key map (kbd "C-c C-c") 'tracker-confirm-step)
774 |     (define-key map (kbd "C-c C-k") 'tracker-revert-step)
775 |     (define-key map (kbd "M-g t") 'tracker-goto-title)
776 |     (define-key map (kbd "M-g b") 'tracker-goto-bpm)
777 |     (define-key map (kbd "M-g S") 'tracker-goto-scratch)
778 |     (define-key map (kbd "M-g p") 'tracker-goto-pattern) ; this overrides the original M-g p action, but i don't think you'll use it in tracker mode anyway... (?)
779 |     (define-key map (kbd "M-g s") 'tracker-goto-step)
780 |     map)
781 |   "Keymap for `tracker-mode'.")
782 | 
783 | ;;; main functions/initialization
784 | 
785 | (defun tracker ()
786 |   "Initialize a new buffer for `tracker-mode'."
787 |   (interactive)
788 |   (unless (tracker-buffer-p)
789 |     (get-buffer-create "*Tracker*")
790 |     (switch-to-buffer "*Tracker*"))
791 |   (tracker-mode))
792 | 
793 | ;;;###autoload
794 | (define-derived-mode tracker-mode emacs-lisp-mode "Tracker"
795 |   "Tracker-inspired livecodable sequencer mode for Emacs."
796 |   (use-local-map tracker-mode-map)
797 |   (tracker-write-template)
798 |   (cursor-intangible-mode 1)
799 |   (tracker-make-confirmed-steps-hash)
800 |   (tracker-update-header)
801 |   (add-to-list 'after-change-functions 'tracker-after-change-function)
802 |   (run-hooks 'tracker-mode-hook))
803 | 
804 | ;;;###autoload
805 | (add-to-list 'auto-mode-alist '("\\.trk\\'" . tracker-mode))
806 | (add-to-list 'auto-mode-alist '("\\.track\\'" . tracker-mode))
807 | 
808 | (provide 'tracker-mode)
809 | 
810 | ;;; tracker-mode.el ends here
811 | 
812 | ;;; NOTES / scratch:
813 | ;; https://stackoverflow.com/questions/9775201/emacs-font-lock-explanation
814 | ;; https://www.reddit.com/r/emacs/comments/tzwk9o/how_do_i_make_rainbowblocks_not_override_default/
815 | ;; https://emacs.stackexchange.com/questions/5400/fontify-a-region-of-a-buffer-with-another-major-mode
816 | ;; https://emacs.stackexchange.com/questions/7568/use-font-lock-mode-on-only-part-of-buffer
817 | ;; https://stackoverflow.com/questions/60622878/is-it-possible-to-inhibit-font-locking-for-a-specific-buffer-region
818 | ;; http://blog.josephwilk.net/art/emacs-as-a-musical-instrument.html
819 | 


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