summaryrefslogtreecommitdiffstats
path: root/player/lua/console.lua
blob: bc74b5d31370f9b2b088c7d6bb46b2bec31d0cc7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
-- Copyright (C) 2019 the mpv developers
--
-- Permission to use, copy, modify, and/or distribute this software for any
-- purpose with or without fee is hereby granted, provided that the above
-- copyright notice and this permission notice appear in all copies.
--
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

local utils = require 'mp.utils'
local options = require 'mp.options'
local assdraw = require 'mp.assdraw'

-- Default options
local opts = {
    -- All drawing is scaled by this value, including the text borders and the
    -- cursor. Change it if you have a high-DPI display.
    scale = 1,
    -- Set the font used for the REPL and the console. This probably doesn't
    -- have to be a monospaced font.
    font = "",
    -- Set the font size used for the REPL and the console. This will be
    -- multiplied by "scale."
    font_size = 16,
}

function detect_platform()
    local o = {}
    -- Kind of a dumb way of detecting the platform but whatever
    if mp.get_property_native('options/vo-mmcss-profile', o) ~= o then
        return 'windows'
    elseif mp.get_property_native('options/cocoa-force-dedicated-gpu', o) ~= o then
        return 'macos'
    end
    return 'x11'
end

-- Pick a better default font for Windows and macOS
local platform = detect_platform()
if platform == 'windows' then
    opts.font = 'Consolas'
elseif platform == 'macos' then
    opts.font = 'Menlo'
else
    opts.font = 'monospace'
end

-- Apply user-set options
options.read_options(opts)

-- Build a list of commands, properties and options for tab-completion
local option_info = {
    'name', 'type', 'set-from-commandline', 'set-locally', 'default-value',
    'min', 'max', 'choices',
}
local cmd_list = {}
for i, cmd in ipairs(mp.get_property_native('command-list')) do
    cmd_list[i] = cmd.name
end
local prop_list = mp.get_property_native('property-list')
for _, opt in ipairs(mp.get_property_native('options')) do
    prop_list[#prop_list + 1] = 'options/' .. opt
    prop_list[#prop_list + 1] = 'file-local-options/' .. opt
    prop_list[#prop_list + 1] = 'option-info/' .. opt
    for _, p in ipairs(option_info) do
        prop_list[#prop_list + 1] = 'option-info/' .. opt .. '/' .. p
    end
end

local repl_active = false
local insert_mode = false
local pending_update = false
local line = ''
local cursor = 1
local history = {}
local history_pos = 1
local log_buffer = {}
local key_bindings = {}
local global_margin_y = 0

local update_timer = nil
update_timer = mp.add_periodic_timer(0.05, function()
    if pending_update then
        update()
    else
        update_timer:kill()
    end
end)
update_timer:kill()

utils.shared_script_property_observe("osc-margins", function(_, val)
    if val then
        -- formatted as "%f,%f,%f,%f" with left, right, top, bottom, each
        -- value being the border size as ratio of the window size (0.0-1.0)
        local vals = {}
        for v in string.gmatch(val, "[^,]+") do
            vals[#vals + 1] = tonumber(v)
        end
        global_margin_y = vals[4] -- bottom
    else
        global_margin_y = 0
    end
    update()
end)

-- Add a line to the log buffer (which is limited to 100 lines)
function log_add(style, text)
    log_buffer[#log_buffer + 1] = { style = style, text = text }
    if #log_buffer > 100 then
        table.remove(log_buffer, 1)
    end

    if repl_active then
        if not update_timer:is_enabled() then
            update()
            update_timer:resume()
        else
            pending_update = true
        end
    end
end

-- Escape a string for verbatim display on the OSD
function ass_escape(str)
    -- There is no escape for '\' in ASS (I think?) but '\' is used verbatim if
    -- it isn't followed by a recognised character, so add a zero-width
    -- non-breaking space
    str = str:gsub('\\', '\\\239\187\191')
    str = str:gsub('{', '\\{')
    str = str:gsub('}', '\\}')
    -- Precede newlines with a ZWNBSP to prevent ASS's weird collapsing of
    -- consecutive newlines
    str = str:gsub('\n', '\239\187\191\\N')
    return str
end

-- Render the REPL and console as an ASS OSD
function update()
    pending_update = false

    local screenx, screeny, aspect = mp.get_osd_size()
    screenx = screenx / opts.scale
    screeny = screeny / opts.scale

    -- Clear the OSD if the REPL is not active
    if not repl_active then
        mp.set_osd_ass(screenx, screeny, '')
        return
    end

    local ass = assdraw.ass_new()
    local style = '{\\r' ..
                  '\\1a&H00&\\3a&H00&\\4a&H99&' ..
                  '\\1c&Heeeeee&\\3c&H111111&\\4c&H000000&' ..
                  '\\fn' .. opts.font .. '\\fs' .. opts.font_size ..
                  '\\bord2\\xshad0\\yshad1\\fsp0\\q1}'
    -- Create the cursor glyph as an ASS drawing. ASS will draw the cursor
    -- inline with the surrounding text, but it sets the advance to the width
    -- of the drawing. So the cursor doesn't affect layout too much, make it as
    -- thin as possible and make it appear to be 1px wide by giving it 0.5px
    -- horizontal borders.
    local cheight = opts.font_size * 8
    local cglyph = '{\\r' ..
                   '\\1a&H44&\\3a&H44&\\4a&H99&' ..
                   '\\1c&Heeeeee&\\3c&Heeeeee&\\4c&H000000&' ..
                   '\\xbord0.5\\ybord0\\xshad0\\yshad1\\p4\\pbo24}' ..
                   'm 0 0 l 1 0 l 1 ' .. cheight .. ' l 0 ' .. cheight ..
                   '{\\p0}'
    local before_cur = ass_escape(line:sub(1, cursor - 1))
    local after_cur = ass_escape(line:sub(cursor))

    -- Render log messages as ASS. This will render at most screeny / font_size
    -- messages.
    local log_ass = ''
    local log_messages = #log_buffer
    local log_max_lines = math.ceil(screeny / opts.font_size)
    if log_max_lines < log_messages then
        log_messages = log_max_lines
    end
    for i = #log_buffer - log_messages + 1, #log_buffer do
        log_ass = log_ass .. style .. log_buffer[i].style .. ass_escape(log_buffer[i].text)
    end

    ass:new_event()
    ass:an(1)
    ass:pos(2, screeny - 2 - global_margin_y * screeny)
    ass:append(log_ass .. '\\N')
    ass:append(style .. '> ' .. before_cur)
    ass:append(cglyph)
    ass:append(style .. after_cur)

    -- Redraw the cursor with the REPL text invisible. This will make the
    -- cursor appear in front of the text.
    ass:new_event()
    ass:an(1)
    ass:pos(2, screeny - 2)
    ass:append(style .. '{\\alpha&HFF&}> ' .. before_cur)
    ass:append(cglyph)
    ass:append(style .. '{\\alpha&HFF&}' .. after_cur)

    mp.set_osd_ass(screenx, screeny, ass.text)
end

-- Set the REPL visibility ("enable", Esc)
function set_active(active)
    if active == repl_active then return end
    if active then
        repl_active = true
        insert_mode = false
        mp.enable_key_bindings('console-input', 'allow-hide-cursor+allow-vo-dragging')
        mp.enable_messages('terminal-default')
        define_key_bindings()
    else
        repl_active = false
        undefine_key_bindings()
        mp.enable_messages('silent:terminal-default')
    end
    update()
end

-- Show the repl if hidden and replace its contents with 'text'
-- (script-message-to repl type)
function show_and_type(text)
    text = text or ''

    -- Save the line currently being edited, just in case
    if line ~= text and line ~= '' and history[#history] ~= line then
        history[#history + 1] = line
    end

    line = text
    cursor = line:len() + 1
    history_pos = #history + 1
    insert_mode = false
    if repl_active then
        update()
    else
        set_active(true)
    end
end

-- Naive helper function to find the next UTF-8 character in 'str' after 'pos'
-- by skipping continuation bytes. Assumes 'str' contains valid UTF-8.
function next_utf8(str, pos)
    if pos > str:len() then return pos end
    repeat
        pos = pos + 1
    until pos > str:len() or str:byte(pos) < 0x80 or str:byte(pos) > 0xbf
    return pos
end

-- As above, but finds the previous UTF-8 charcter in 'str' before 'pos'
function prev_utf8(str, pos)
    if pos <= 1 then return pos end
    repeat
        pos = pos - 1
    until pos <= 1 or str:byte(pos) < 0x80 or str:byte(pos) > 0xbf
    return pos
end

-- Insert a character at the current cursor position (any_unicode, Shift+Enter)
function handle_char_input(c)
    if insert_mode then
        line = line:sub(1, cursor - 1) .. c .. line:sub(next_utf8(line, cursor))
    else
        line = line:sub(1, cursor - 1) .. c .. line:sub(cursor)
    end
    cursor = cursor + #c
    update()
end

-- Remove the character behind the cursor (Backspace)
function handle_backspace()
    if cursor <= 1 then return end
    local prev = prev_utf8(line, cursor)
    line = line:sub(1, prev - 1) .. line:sub(cursor)
    cursor = prev
    update()
end

-- Remove the character in front of the cursor (Del)
function handle_del()
    if cursor > line:len() then return end
    line = line:sub(1, cursor - 1) .. line:sub(next_utf8(line, cursor))
    update()
end

-- Toggle insert mode (Ins)
function handle_ins()
    insert_mode = not insert_mode
end

-- Move the cursor to the next character (Right)
function next_char(amount)
    cursor = next_utf8(line, cursor)
    update()
end

-- Move the cursor to the previous character (Left)
function prev_char(amount)
    cursor = prev_utf8(line, cursor)
    update()
end

-- Clear the current line (Ctrl+C)
function clear()
    line = ''
    cursor = 1
    insert_mode = false
    history_pos = #history + 1
    update()
end

-- Close the REPL if the current line is empty, otherwise do nothing (Ctrl+D)
function maybe_exit()
    if line == '' then
        set_active(false)
    end
end

-- Run the current command and clear the line (Enter)
function handle_enter()
    if line == '' then
        return
    end
    if history[#history] ~= line then
        history[#history + 1] = line
    end

    mp.command(line)
    clear()
end

-- Go to the specified position in the command history
function go_history(new_pos)
    local old_pos = history_pos
    history_pos = new_pos

    -- Restrict the position to a legal value
    if history_pos > #history + 1 then
        history_pos = #history + 1
    elseif history_pos < 1 then
        history_pos = 1
    end

    -- Do nothing if the history position didn't actually change
    if history_pos == old_pos then
        return
    end

    -- If the user was editing a non-history line, save it as the last history
    -- entry. This makes it much less frustrating to accidentally hit Up/Down
    -- while editing a line.
    if old_pos == #history + 1 and line ~= '' and history[#history] ~= line then
        history[#history + 1] = line
    end

    -- Now show the history line (or a blank line for #history + 1)
    if history_pos <= #history then
        line = history[history_pos]
    else
        line = ''
    end
    cursor = line:len() + 1
    insert_mode = false
    update()
end

-- Go to the specified relative position in the command history (Up, Down)
function move_history(amount)
    go_history(history_pos + amount)
end

-- Go to the first command in the command history (PgUp)
function handle_pgup()
    go_history(1)
end

-- Stop browsing history and start editing a blank line (PgDown)
function handle_pgdown()
    go_history(#history + 1)
end

-- Move to the start of the current word, or if already at the start, the start
-- of the previous word. (Ctrl+Left)
function prev_word()
    -- This is basically the same as next_word() but backwards, so reverse the
    -- string in order to do a "backwards" find. This wouldn't be as annoying
    -- to do if Lua didn't insist on 1-based indexing.
    cursor = line:len() - select(2, line:reverse():find('%s*[^%s]*', line:len() - cursor + 2)) + 1
    update()
end

-- Move to the end of the current word, or if already at the end, the end of
-- the next word. (Ctrl+Right)
function next_word()
    cursor = select(2, line:find('%s*[^%s]*', cursor)) + 1
    update()
end

-- List of tab-completions:
--   pattern: A Lua pattern used in string:find. Should return the start and
--            end positions of the word to be completed in the first and second
--            capture groups (using the empty parenthesis notation "()")
--   list: A list of candidate completion values.
--   append: An extra string to be appended to the end of a successful
--           completion. It is only appended if 'list' contains exactly one
--           match.
local completers = {
    { pattern = '^%s*()[%w_-]+()$', list = cmd_list, append = ' ' },
    { pattern = '^%s*set%s+()[%w_/-]+()$', list = prop_list, append = ' ' },
    { pattern = '^%s*set%s+"()[%w_/-]+()$', list = prop_list, append = '" ' },
    { pattern = '^%s*add%s+()[%w_/-]+()$', list = prop_list, append = ' ' },
    { pattern = '^%s*add%s+"()[%w_/-]+()$', list = prop_list, append = '" ' },
    { pattern = '^%s*cycle%s+()[%w_/-]+()$', list = prop_list, append = ' ' },
    { pattern = '^%s*cycle%s+"()[%w_/-]+()$', list = prop_list, append = '" ' },
    { pattern = '^%s*multiply%s+()[%w_/-]+()$', list = prop_list, append = ' ' },
    { pattern = '^%s*multiply%s+"()[%w_/-]+()$', list = prop_list, append = '" ' },
    { pattern = '${()[%w_/-]+()$', list = prop_list, append = '}' },
}

-- Use 'list' to find possible tab-completions for 'part.' Returns the longest
-- common prefix of all the matching list items and a flag that indicates
-- whether the match was unique or not.
function complete_match(part, list)
    local completion = nil
    local full_match = false

    for _, candidate in ipairs(list) do
        if candidate:sub(1, part:len()) == part then
            if completion and completion ~= candidate then
                local prefix_len = part:len()
                while completion:sub(1, prefix_len + 1)
                       == candidate:sub(1, prefix_len + 1) do
                    prefix_len = prefix_len + 1
                end
                completion = candidate:sub(1, prefix_len)
                full_match = false
            else
                completion = candidate
                full_match = true
            end
        end
    end

    return completion, full_match
end

-- Complete the option or property at the cursor (TAB)
function complete()
    local before_cur = line:sub(1, cursor - 1)
    local after_cur = line:sub(cursor)

    -- Try the first completer that works
    for _, completer in ipairs(completers) do
        -- Completer patterns should return the start and end of the word to be
        -- completed as the first and second capture groups
        local _, _, s, e = before_cur:find(completer.pattern)
        if not s then
            -- Multiple input commands can be separated by semicolons, so all
            -- completions that are anchored at the start of the string with
            -- '^' can start from a semicolon as well. Replace ^ with ; and try
            -- to match again.
            _, _, s, e = before_cur:find(completer.pattern:gsub('^^', ';'))
        end
        if s then
            -- If the completer's pattern found a word, check the completer's
            -- list for possible completions
            local part = before_cur:sub(s, e)
            local c, full = complete_match(part, completer.list)
            if c then
                -- If there was only one full match from the list, add
                -- completer.append to the final string. This is normally a
                -- space or a quotation mark followed by a space.
                if full and completer.append then
                    c = c .. completer.append
                end

                -- Insert the completion and update
                before_cur = before_cur:sub(1, s - 1) .. c
                cursor = before_cur:len() + 1
                line = before_cur .. after_cur
                update()
                return
            end
        end
    end
end

-- Move the cursor to the beginning of the line (HOME)
function go_home()
    cursor = 1
    update()
end

-- Move the cursor to the end of the line (END)
function go_end()
    cursor = line:len() + 1
    update()
end

-- Delete from the cursor to the end of the word (Ctrl+W)
function del_word()
    local before_cur = line:sub(1, cursor - 1)
    local after_cur = line:sub(cursor)

    before_cur = before_cur:gsub('[^%s]+%s*$', '', 1)
    line = before_cur .. after_cur
    cursor = before_cur:len() + 1
    update()
end

-- Delete from the cursor to the end of the line (Ctrl+K)
function del_to_eol()
    line = line:sub(1, cursor - 1)
    update()
end

-- Delete from the cursor back to the start of the line (Ctrl+U)
function del_to_start()
    line = line:sub(cursor)
    cursor = 1
    update()
end

-- Empty the log buffer of all messages (Ctrl+L)
function clear_log_buffer()
    log_buffer = {}
    update()
end

-- Returns a string of UTF-8 text from the clipboard (or the primary selection)
function get_clipboard(clip)
    if platform == 'x11' then
        local res = utils.subprocess({
            args = { 'xclip', '-selection', clip and 'clipboard' or 'primary', '-out' },
            playback_only = false,
        })
        if not res.error then
            return res.stdout
        end
    elseif platform == 'windows' then
        local res = utils.subprocess({
            args = { 'powershell', '-NoProfile', '-Command', [[& {
                Trap {
                    Write-Error -ErrorRecord $_
                    Exit 1
                }

                $clip = ""
                if (Get-Command "Get-Clipboard" -errorAction SilentlyContinue) {
                    $clip = Get-Clipboard -Raw -Format Text -TextFormatType UnicodeText
                } else {
                    Add-Type -AssemblyName PresentationCore
                    $clip = [Windows.Clipboard]::GetText()
                }

                $clip = $clip -Replace "`r",""
                $u8clip = [System.Text.Encoding]::UTF8.GetBytes($clip)
                [Console]::OpenStandardOutput().Write($u8clip, 0, $u8clip.Length)
            }]] },
            playback_only = false,
        })
        if not res.error then
            return res.stdout
        end
    elseif platform == 'macos' then
        local res = utils.subprocess({
            args = { 'pbpaste' },
            playback_only = false,
        })
        if not res.error then
            return res.stdout
        end
    end
    return ''
end

-- Paste text from the window-system's clipboard. 'clip' determines whether the
-- clipboard or the primary selection buffer is used (on X11 only.)
function paste(clip)
    local text = get_clipboard(clip)
    local before_cur = line:sub(1, cursor - 1)
    local after_cur = line:sub(cursor)
    line = before_cur .. text .. after_cur
    cursor = cursor + text:len()
    update()
end

-- List of input bindings. This is a weird mashup between common GUI text-input
-- bindings and readline bindings.
local bindings = {
    { 'esc',         function() set_active(false) end       },
    { 'enter',       handle_enter                           },
    { 'shift+enter', function() handle_char_input('\n') end },
    { 'bs',          handle_backspace                       },
    { 'shift+bs',    handle_backspace                       },
    { 'del',         handle_del                             },
    { 'shift+del',   handle_del                             },
    { 'ins',         handle_ins                             },
    { 'shift+ins',   function() paste(false) end            },
    { 'mbtn_mid',    function() paste(false) end            },
    { 'left',        function() prev_char() end             },
    { 'right',       function() next_char() end             },
    { 'up',          function() move_history(-1) end        },
    { 'wheel_up',    function() move_history(-1) end        },
    { 'down',        function() move_history(1) end         },
    { 'wheel_down',  function() move_history(1) end         },
    { 'wheel_left',  function() end                         },
    { 'wheel_right', function() end                         },
    { 'ctrl+left',   prev_word                              },
    { 'ctrl+right',  next_word                              },
    { 'tab',         complete                               },
    { 'home',        go_home                                },
    { 'end',         go_end                                 },
    { 'pgup',        handle_pgup                            },
    { 'pgdwn',       handle_pgdown                          },
    { 'ctrl+c',      clear                                  },
    { 'ctrl+d',      maybe_exit                             },
    { 'ctrl+k',      del_to_eol                             },
    { 'ctrl+l',      clear_log_buffer                       },
    { 'ctrl+u',      del_to_start                           },
    { 'ctrl+v',      function() paste(true) end             },
    { 'meta+v',      function() paste(true) end             },
    { 'ctrl+w',      del_word                               },
}

local function text_input(info)
    if info.key_text and (info.event == "press" or info.event == "down"
                          or info.event == "repeat")
    then
        handle_char_input(info.key_text)
    end
end

function define_key_bindings()
    if #key_bindings > 0 then
        return
    end
    for _, bind in ipairs(bindings) do
        -- Generate arbitrary name for removing the bindings later.
        local name = "_console_" .. (#key_bindings + 1)
        key_bindings[#key_bindings + 1] = name
        mp.add_forced_key_binding(bind[1], name, bind[2], {repeatable = true})
    end
    mp.add_forced_key_binding("any_unicode", "_console_text", text_input,
        {repeatable = true, complex = true})
    key_bindings[#key_bindings + 1] = "_console_text"
end

function undefine_key_bindings()
    for _, name in ipairs(key_bindings) do
        mp.remove_key_binding(name)
    end
    key_bindings = {}
end

-- Add a global binding for enabling the REPL. While it's enabled, its bindings
-- will take over and it can be closed with ESC.
mp.add_key_binding(nil, 'enable', function()
    set_active(true)
end)

-- Add a script-message to show the REPL and fill it with the provided text
mp.register_script_message('type', function(text)
    show_and_type(text)
end)

-- Redraw the REPL when the OSD size changes. This is needed because the
-- PlayRes of the OSD will need to be adjusted.
mp.observe_property('osd-width', 'native', update)
mp.observe_property('osd-height', 'native', update)

-- Enable log messages. In silent mode, mpv will queue log messages in a buffer
-- until enable_messages is called again without the silent: prefix.
mp.enable_messages('silent:terminal-default')

mp.register_event('log-message', function(e)
    -- Ignore log messages from the OSD because of paranoia, since writing them
    -- to the OSD could generate more messages in an infinite loop.
    if e.prefix:sub(1, 3) == 'osd' then return end

    -- Ignore messages output by this script.
    if e.prefix == mp.get_script_name() then return end

    -- Ignore buffer overflow warning messages. Overflowed log messages would
    -- have been offscreen anyway.
    if e.prefix == 'overflow' then return end

    -- Filter out trace-level log messages, even if the terminal-default log
    -- level includes them. These aren't too useful for an on-screen display
    -- without scrollback and they include messages that are generated from the
    -- OSD display itself.
    if e.level == 'trace' then return end

    -- Use color for debug/v/warn/error/fatal messages. Colors are stolen from
    -- base16 Eighties by Chris Kempson.
    local style = ''
    if e.level == 'debug' then
        style = '{\\1c&Ha09f93&}'
    elseif e.level == 'v' then
        style = '{\\1c&H99cc99&}'
    elseif e.level == 'warn' then
        style = '{\\1c&H66ccff&}'
    elseif e.level == 'error' then
        style = '{\\1c&H7a77f2&}'
    elseif e.level == 'fatal' then
        style = '{\\1c&H5791f9&\\b1}'
    end

    log_add(style, '[' .. e.prefix .. '] ' .. e.text)
end)