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sva_cli/
help.rs

1// Concern: the `--help` page, each flag's default printed from its own constant | Non-concern: parsing those flags (args/), the JSON a subcommand answers (output.rs) | IO: () -> the page
2
3use sva_core::DEFAULT_STORE_BYTES;
4use sva_engine::{
5    DEFAULT_BUFFER_SECS, DEFAULT_CELL_SECS, DEFAULT_FLOOR_DB, DEFAULT_FRAME_SECS,
6    DEFAULT_LEDGER_DEPTH, DEFAULT_MAX_PAIRS, DEFAULT_MAX_PEAKS, DEFAULT_MODULATION_WINDOW_SECS,
7    DEFAULT_NOVELTY_WINDOW_SECS, DEFAULT_OVERSAMPLE, DEFAULT_PERIODICITY_WINDOW_SECS,
8    DEFAULT_SAMPLE_RATE, DEFAULT_SMOOTH_SECS, PSYCHOACOUSTIC_V1, READINGS, Reads,
9    self_similarity::MAX_CELLS,
10};
11
12/// Read off the constants the parser itself defaults to, so a printed default cannot drift
13/// from the one a render actually uses.
14pub fn help_text() -> String {
15    let bits = PSYCHOACOUSTIC_V1.precision_bits;
16    let store_gb = DEFAULT_STORE_BYTES >> 30;
17    let representations = representations();
18    format!(
19        r#"USAGE:
20  sva-cli (render | analyze | lint | trace | builtins | outline | new) [arguments]
21
22DESCRIPTION:
23  A composition is a directory of node files, each one closed-form expression in
24  `t` or `f` on one line, or a score placing notes in time. sva-cli reads that
25  composition and prints what it is and what it sounds like, as JSON on stdout.
26  `render`, `lint` and `trace` read the current directory; `new` writes beside it
27  and `analyze` reads a file.
28
29SCORES:
30  A score is a `.jsonl` file: JSON Lines, one object per line, sorted by `at`;
31  `@score/drop` reads `score/drop.jsonl`, and a ref never writes `.jsonl`. A
32  file with no extension opening with `{{` refuses with the rename. Line 1 is
33  its annotation, the doc comment's four fields, which `lint` holds it to:
34    {{"annotation": "Models: ... | Neglects: ... | IO: (t) -> amplitude | Tags: ..."}}
35  Every other line is one kind, told by its keys, and may add `"comment"`:
36    event    "at", "node", "deg", "len" and the node's parameters: plays it
37    mark     "at", "mark": a point `mark(name)` reads in this file's times
38    comment  "at", "comment": a note to the reader at a time
39    move     "at", "lane", "to", and "node", "len", "shape" where written
40  A score lowers to equations, the sum of its events in written order, each
41  its node shifted to its `at`; marks, comments and moves sound nothing.
42    at     a time string, "0.25b" or "0.5s", or arithmetic over times, "2b +
43           1b/3" for a triplet; a bare number has no unit and refuses. A file
44           counts every time in bars or every one in seconds. "mark(verse) -
45           2b" is a position, "mark(drop) - mark(build)" a duration.
46    node   an `@ref` from the score's own directory: a sound, an equation or
47           another score. On a line placing a score `len` crops it there and
48           nothing else binds; a `node` list mixing scores and sounds refuses
49           `len`.
50    deg    a whole scale degree counted from 1, the tonic: sugar for "f0":
51           "deg(n)". In a seven-row scale 8 is the tonic an octave up, 0 the
52           seventh below and -6 the tonic an octave down. A chromatic note
53           binds "f0": "deg(7)*1st"; a line writing both refuses.
54    len    a time as `at` takes, bound as the node's `len`.
55    other  binds the node's parameter of that name: a number, or a constant in
56           a string, "0.03s", "-6db", "900hz", "A1", "0.8*0.9", "deg(5)/2".
57  Any field but `comment` may be a list. A line listing N items is N events,
58  moves or marks, item i of every list going to the i-th and a single value to
59  all; lists of different lengths refuse. A chord is a `deg` list on one `at`:
60    {{"at": "0b", "node": "@../instruments/keys", "deg": [1, 3, 5],
61      "vel": [0.8, 0.5, 0.6]}}
62  `deg(n)` is the tonic in `variables/key` times degree n's ratio in the scale
63  `variables/scale` names, read where the line sits, in a score or in any
64  equation. A scale is one the language names, as `minor` or `dorian` (`sva-cli
65  builtins` lists each with its cents), or a file of one row per degree in cents
66  above the tonic, ascending, the last the period, named by a ref: a file
67  `scales/custom` holding 200 400 500 700 900 1100 1200 is the major scale. A
68  value reading `t` or a `@ref`, a field the node does not read, a parameter it
69  reads that nothing binds, and a `deg` with no scale refuse before any audio,
70  each naming the score's file, line and column.
71
72  A lane is one value moving through the song: a node's parameter, a move
73  naming "node" and "lane": "cutoff", or a variable under `variables/`, a move
74  naming "lane" alone: "energy", "key", "scale", "bpm" (never "meter"). A move
75  with no `len` sets the lane at `at`; with "len" and "shape", `lin` or `exp`,
76  it ramps there from the value it holds:
77    {{"at": "24b", "node": "@../instruments/saw", "lane": "cutoff",
78      "to": "9khz", "len": "8b", "shape": "exp"}}
79    {{"at": "72b", "lane": "key", "to": "key*2st", "comment": "a tone up"}}
80    {{"at": "92b", "lane": "bpm", "to": "bpm*8/9", "len": "4b", "shape": "lin"}}
81  A `to` naming the lane means its home value, the node's default or the
82  variable's file, so it follows `--set`. A lane reaches every instance of its
83  node, from a score or an equation, inside a wrapper too, unless the line or
84  an invoking equation passes that parameter, which wins. Where it holds one
85  value over an instance's span it binds that number; where it moves there the
86  instance reads it at its song time, and where the engine refuses a moving
87  value, such as `sat`'s `drive`, the move refuses as `bad-lane`: pass a
88  constant, move the lane between notes, or close the sound's tail with a crop.
89  A score's times ride the tempo curve the `bpm` lane draws; `b` in an equation
90  stays a bar of `variables/bpm`. A song places its sections at marks:
91    {{"at": "0b", "mark": "intro"}}
92    {{"at": "mark(intro)", "node": "@intro"}}
93    {{"at": "mark(intro) + 8b", "mark": "verse"}}
94    {{"at": "mark(verse)", "node": "@verse"}}
95  `concat` and `repeat` place parts on the curve too: `repeat(@score/riff-1b, 4)`.
96  An equation reading a score at `t - d`, an echo or a send, hears the song as
97  it was d earlier: its lines keep their song time, and a move however many
98  reads reach it is one move.
99  A control score is one no sounding score places, read by an equation as a
100  signal: `@score/song(t) * (1 - @score/pump(t))` ducks the song under it.
101  `sva-cli outline @score/song` prints a song's marks, tempo, lanes, events and
102  size. Lint and render warn of a line passing a parameter whose lane ramps
103  under it (`line-overrides-lane`), and of a lane no instance reads
104  (`lane-reaches-nothing`).
105
106RESERVED VARIABLES:
107  Four nodes under `variables/` are reserved: a ref reads one like any node,
108  and a bar or a degree reads one by name:
109    variables/bpm     a number, the beats per minute: 120
110    variables/meter   beats per bar over the note: 4/4
111    variables/key     the tonic `deg` counts from, a note or hertz: C3
112    variables/scale   the scale `deg` counts in, a built-in's name: major, or a
113                      ref to a scale file: @../scales/custom
114  A `b` literal or a file's `-2b` span reads bpm and meter; a `deg(n)` reads key
115  and scale. Before anything renders, each read is replaced by its value, by one
116  pass for all four: a bar becomes `n*(beats*60/bpm)` seconds and `deg(n)`
117  becomes `@variables/key` times degree n's ratio, the tonic still a ref. A
118  read with no value to replace it refuses as `bad-tempo` or `bad-scale`, as
119  does a variable holding no such value, such as bpm without meter, or a
120  scale name no built-in has, which refuses listing every built-in. A stream's
121  edit to a variable, or to the scale file it names, replaces every read of it
122  again. A node elsewhere named `bpm` is an ordinary node. Any other file under
123  `variables/`, as `variables/energy` holding 0.5, is a variable of the
124  composition's own: a ref reads it, `--set` sets it, and a score's moves move
125  it, as they move the reserved ones but `meter` (SCORES).
126
127RENDER:
128  sva-cli render '<expression>' --representation <list> [--until '<condition>']
129                 [--bits <n>] [--rate <hz>] [--threads <n>] [--cache <path|none>]
130                 [--set <name>=<text>]... [--confirm]
131
132  Renders one expression, in the grammar a node file's body uses, and prints one
133  reading per representation under `data.representations`. `@path` reads a node
134  from the current directory and `@/abs/path` one anywhere; there is no default
135  target. Every reading states its `source` (exact or measured), the
136  conformance profile it ran under, and its rate.
137
138  The target's own ref may read an interval: `@piano4([0, 2b], f0=C4,
139  vel=0.5, release=1s)`, where `release` is the instrument's own parameter. Its ends are the language's literals (`s`, `ms`, `b`,
140  `sp`, or a bare `0`); `[a, inf)` and `[a,)` leave the end open; the other
141  arguments are the node's own named ones. The start trims the output alone:
142  history before it is still computed, so a loop or a filter carries the state
143  it had there. With no interval the render starts at 0, earlier only where a
144  crop reaches before it, and its end is open. Inside an expression a window is
145  a `crop`. A target that samples its one ref read, `sample(@piano4([0, 2b],
146  f0=C4))`, reads that ref's interval and binds and the same node values.
147
148  Every node is computed over its support met with what reads it, and nowhere
149  else: outside its support a node is exactly zero. A closed interval renders
150  exactly its length, nothing cut. An open one ends where the root's support
151  does: a crop's end, the exact underflow of an `exp`, a clamp holding a factor
152  at zero; or earlier, where a proven upper bound on the root's magnitude stays
153  under the profile's silence threshold (-120 dBFS) from a sample on. A root
154  with no such bound (a held sine, a loop) is never cut. The label's `pruned`
155  states the threshold as `db` and the root's cut, `from` the sample the render
156  is treated as silent from. A stream's term leaves `@notes` where its support
157  ends. An open interval over a root whose support never ends and is never cut
158  (a held sine, a physical solver) refuses as `render.no_end`. A short-time
159  transform reads its input whole, and refuses one with no end as
160  `engine.unbounded_extent`. A form in `f` with no dual in `t` has no samples
161  and refuses as its dual does, `cast.left_algebra`.
162
163  A render is a stream pulled to its end: a closed form, a short-time
164  transform and what either reads are computed over their whole extent first,
165  and every other node block by block. `--until '<condition>'` stops the render
166  at the first sample the condition holds at, or at the interval's end,
167  whichever is first. It is checked as each block is pulled, so no node driven
168  block by block runs past the block it holds in. A condition compares (`<`,
169  `<=`, `>`, `>=`) `t`, `envelope(t)` (the RMS over every channel of the
170  `envelope` representation's frame holding `t`, framed by its own `frame`
171  where one is asked) and literals, joined by `and`/`or`.
172
173  `--representation <list>` takes a comma list of readings and may repeat. Each
174  is a call in the language's own syntax, its options its named arguments:
175  `spectrum(peaks=8, frame=50ms)`, `ledger(depth=3, brief=1)`. A `frame`,
176  `window`, `cell` or `smooth` is a time as a score writes one, in seconds,
177  `50ms`, or in bars, `1b/8` (`1/8b` is one over eight bars), a bar lasting
178  what the render's tempo says; where none is known, as in `analyze`, bars
179  refuse as `tempo.invalid_bpm_meter`. An entry
180  followed by `=<path>` writes a file instead, listed under `written`:
181  `samples=<path>.wav` writes audio, encoded as `--bits` says; any other path
182  takes the reading's JSON, uncapped. A path that already holds a file refuses
183  unless `--confirm` is written. `samples=alsa:<device>` plays the samples on
184  that ALSA device (`alsa:default`, `alsa:hw:1`, `alsa:plughw:1,0`) as each
185  block is pulled, in real time, through `aplay` from alsa-utils; Linux only,
186  anywhere else it refuses as `destination.unsupported_platform`. It sends
187  32-bit floats, or integer PCM where `--bits` is 16 or under. A device that
188  cannot take the format refuses with aplay's reason, and one aplay says plays
189  another rate than the render's stops there as `destination.rate_inexact`.
190  `samples(buffer=<t>)` is how much the device holds ahead of what it plays.
191  Once it has played out, `data.played` states the device, its seconds, rate,
192  channels, format, the buffer asked and the one granted, and every underrun
193  aplay reported, with what it cannot see.
194  `lines`, `atoms`, `derivative`, `bindings`, `arguments`, and a closed form's
195  `spectrum`, `envelope` and `pitch`, read the expression and ignore the range.
196
197  A closed form's `spectrum` and `pitch` are its exact lines, so a term under a
198  crop or an envelope, which has a width and is no line, refuses them; so do
199  `spectrum(frame=)` and `envelope(frame=)`, as a closed form has no frames. To
200  measure any of them frame by frame, a reader samples the target's ref,
201  `sample(@x([0, 1s]))`, and an author writes `sample(...)` inside the node.
202  A closed form with no exact envelope, such as a crop of a decay, refuses
203  `envelope` with the reason rather than measuring it unasked; `sample(...)`
204  asks for the measured one. A measured `spectrum` is one spectrum: every
205  `frame`-long window across the range, averaged. `pitch` is framed, one entry
206  per `frame`; for the spectrum at one instant, read a range one frame long.
207  A measured `envelope` is framed too, and reads every channel: a frame's
208  `rms` is the root mean square of all its channels' samples together, its
209  `peak` the largest magnitude in any channel. `onsets` reads every channel
210  as well: a frame's flux is the sum of each channel's, and a strike's energy
211  that of all channels' samples together, so opposite phases cancel nothing.
212  Every other measured reading but `stereo` reads every channel in power, as
213  `envelope` reads a level: a spectrum's power per bin (`spectrum`, `pitch`,
214  the partials `dissonance`, `voice_leading`, `tonal_distance`,
215  `inharmonicity` and `self_similarity` pick), a formant frame's
216  autocorrelation and each auditory band's energy (`bands`, `periodicity`,
217  `modulation`, `self_similarity`) are each channel's averaged, so a channel
218  copied to two reads as itself; `crest` sets any channel's peak against the
219  RMS of all of them together. A closed form's exact partials are its first
220  component's.
221
222  `--bits <n>` is the precision every sample is written to, from 2 to 52: the
223  point where a series is truncated, and the encoding of a `.wav`, integer PCM
224  at n bits up to 16 and 32-bit float above. `--rate <hz>` (default
225  {DEFAULT_SAMPLE_RATE}) is the one rate a render samples at: the target is read
226  at its instants, and every node at the instants its reader asks for. A
227  closed form is exact at any instant, and so is a continuous loop, one
228  constant delay at a gain under 1 over a closed form such as
229  `x + 0.5*self(t - 17ms)`, which is its series. A filter, a discrete loop, a
230  solver and `rand` step at the rate asked for, where `1sp` is one step, so an
231  `sp` count or `self[idx(t) - 1]` means one sample at whatever rate is asked.
232  `rand` draws once per step, keyed by that step's index; a key between steps
233  reads the step nearest it, ties to even.
234
235  `--set <name>=<text>` renders as if the variable `variables/<name>` held
236  `<text>`, and writes no file: `--set key=G3` transposes every degree to G3,
237  `--set scale=dorian` changes mode (a scale file is a ref written from
238  `variables/`, as the file holds it: `--set scale=@../scales/custom`), `--set
239  bpm=140` moves every bar, `--set meter=3/4` regroups them and `--set
240  energy=0.8` sets a variable of the composition's own. It sets a lane's home
241  value: a move whose `to` names it follows. It may repeat, once per variable: a
242  variable set twice refuses as `render.set_twice`, a name with no file under
243  `variables/` that is no reserved one as `render.set_unreserved`, listing the
244  variables there, and the file's path, `variables/key=G3`, as
245  `render.set_path`, naming the short form.
246
247  `--threads <n>` (default: every core the machine reports) is the most
248  threads a render computes on; `1` computes every value in turn on one.
249  Values none of the others reads, and the blocks of a value that holds no
250  state, compute apart, to the same bits on any number of threads.
251
252  A discrete loop reads its own past only by index; `self(t - d)` in one
253  refuses as `type.discrete_self_at_time`, naming what made it discrete. A
254  read `@x(k*t - d)` steps `x` at `k` times the step, every input it reads,
255  `sp` and `idx` with it, and rounds `d` to the nearest sample of that step,
256  ties to even: shifts are rounded to the nearest sample so placements share
257  one cached value; timing is exact to half a sample, and the label's
258  `moved_s` states the most any read moved. A node is computed once
259  per step however many reads ask for it. A node that holds state read at a
260  time that moves refuses as `type.stateful_warp`, naming what
261  holds its state; `@x[idx(...)]` reads its nearest step instead, as `p[idx(...)]`
262  does a signal passed in as parameter `p`, and any `idx`, as
263  `idx(t - 5ms - 2ms*sin(2*pi*t))`, is read sample by sample. An edit to a
264  stream plays from the next sample on.
265
266  A render keeps in a store on disk its target and, under it, each node of
267  samples that holds state (a filter, a discrete loop or a solver in it) or
268  that two or more nodes read. Nothing else is kept. A closed form, `sample`
269  of one and `rand` have a value at any instant and are computed where read.
270  A node without state that one node alone reads, however many times, is
271  computed again by that reader from what the node itself reads: no other
272  reader could ask for it, and without state it restarts at any sample, where
273  a filter or a loop must run from its start. So a stage worth keeping is a
274  node of its own that ends in a filter or a loop, or one two nodes read. A
275  kept value is named by what it computes: never its file's name, directory,
276  comments, spacing, or the order its named arguments are written in, so a
277  renamed or moved copy, a constant lifted into a default, an expression split
278  into a file of its own or written back inline, and two addends swapped all
279  read one entry. The next render of anything that reads the same value reads
280  it back, bit for bit, and computes nothing under it. The store is on by
281  default, at `$XDG_CACHE_HOME/sva`, else `~/.cache/sva`; `--cache <path>`
282  moves it (a `/dev/shm` path keeps it in memory) and `--cache none` turns it
283  off. It holds at most {store_gb} GB, the least recently used values going
284  first, and a store another build of sva-cli wrote is emptied when opened. A
285  render stages what it computes beside the store as it goes, and the store
286  itself is written once, when the render ends, fails, or is stopped by SIGINT
287  or SIGTERM.
288
289  `ledger` prints one row per node under the target. A row's `share` is the
290  part of its reader's own energy that row accounts for, so one reader's refs
291  sum to 1; a ref no addend isolates, such as one factor of a product, prints
292  `null`. Each ref carrying a share is collapsed once on its own, so a ledger
293  costs one collapse per attributed ref beyond the render, and `depth` bounds
294  how many, counted in refs from one file to another. Every row is computed
295  whole over the range, however late a reader reads it. `brief=1` keeps only
296  the rows that clipped, `skim=1` drops the wider fields.
297
298  `arguments` renders nothing: for every instance under the target it prints
299  each builtin call's named arguments as the numbers the call was lowered
300  with, a solver's whole parameter set with `written: false` on each default
301  it filled in, and the operand each `min`/`max` `chosen` where a call folds
302  one to a number: in named arguments and a solver's, modal bank's or
303  `noise`'s positionals. One inside a filter's or cast's positional or
304  `rand`'s key or seed is not listed. `at` spans are bytes of the instance's
305  own body, as `sva-cli outline` counts them.
306
307REPRESENTATIONS:
308  Each one a `--representation` call, its arguments in parentheses, every
309  default under DEFAULTS. `exact` is read off the written math, `measured` off
310  samples.
311
312{representations}
313
314ANALYZE:
315  sva-cli analyze <file.wav> --representation <list> [--confirm]
316
317  Runs the same readings over a whole external `.wav` at its own rate, never
318  resampled. Only the readings a buffer answers alone apply, each listed under
319  REPRESENTATIONS as `measured` or `exact off a closed form, measured off
320  samples`; the rest need the graph behind it.
321
322LINT:
323  sva-cli lint ['<expression>'] [--format <json|text>]
324
325  Checks the current directory without rendering a sample. With no target it
326  checks every file under its own rules, and types every entry point, which
327  types every file it reaches. With a target, in render's grammar, it checks
328  the files that target reaches, and prints the interval a render of it reads.
329  Either refuses a type error as `render` does.
330
331  A score's annotation is its doc comment, under the same codes, and its lines
332  no body, so the length checks pass it by; a file of two or more lines that is
333  neither a score nor a scale refuses as `multiline-body` before any check
334  runs. Each song lint types prints its warnings beside the findings.
335
336  Every check prints one `data.diagnostics` item. `warning` exits 0, `error`
337  exits non-zero, so branch on the verdict and never on whether the array is
338  empty. No flag downgrades an error.
339
340  error    missing-comment       no `;` comment line
341           multiline-comment     more than one
342           malformed-comment     not four ` | ` fields, `Models:` `Neglects:`
343                                 `IO: <in> -> <out>` `Tags: <tag>[, <tag>...]`
344           long-comment-block    a `;` block over 1000 characters, the line-1
345                                 doc comment's own run exempted
346           long-expression-body  a body over 10000 characters, a backstop rather
347                                 than a complexity budget
348           literal-sample-rate   a written rate where `sp` belongs
349           arity                 a builtin called without an argument it reads,
350                                 or with one it does not, as `rand(seed=k)`
351  warning  key-is-not-a-pitch    `variables/key` holds neither a note name nor
352                                 a number of hertz
353           parameter-has-no-default
354                                 a node reads a parameter no `name = value` line
355                                 binds, so a bare `@node` cannot play
356           support-never-ends    a node's support, cut where its bound falls
357                                 under the silence threshold, has no end for a
358                                 bare render to stop at
359
360TRACE:
361  sva-cli trace <node|expression>
362
363  Prints one node's position without rendering audio: what it reads (`down`, one
364  hop), everything that reads it (`up`, transitively to an entry point), each
365  beside the expression doing the reading, the node that made it discrete, and
366  the feedback loop it sits in, if any. A score is shown as its line count, its
367  first and last `at` and the nodes it plays, never the sum it lowers to; every
368  entry point's song is lowered first, each at song time 0. An interval the
369  target reads is ignored.
370
371BUILTINS:
372  sva-cli builtins
373
374  Prints the whole callable and syntactic vocabulary: every builtin with its
375  arity and named arguments, each argument's `meaning`, `unit`, the model
376  `part` it sets and whether it `moves` with `t` (a filter's cutoff, q and gain;
377  every other named argument is one number, refused when it names none), each
378  positional's meaning where the model states one, unit suffixes, the note-name
379  grammar, the scales `variables/scale` may name with their cents, reserved
380  identifiers, special call shapes, and what has no operator at all.
381
382OUTLINE:
383  sva-cli outline <expression>
384
385  Prints the parse tree the engine builds from one expression, each node with
386  the byte `span` it was written in: calls by `name` with positional and named
387  `args`, operators by `op`, refs by `path` with their `binds`, refs and `self`
388  by how they `read`, `time` or `index`, literals by `value` and `unit`, names
389  by `name`. A node the parser supplies itself, the `0` of a prefix minus or the
390  `t` of a bare `@ref`, has `written: false`. Reads no composition. Score text,
391  JSON opening with `{{`, prints `score` instead of `outline`: one item per item
392  a line lists, with its `kind`, `line`, `span`, `at` with marks resolved, and
393  its `node`, `deg`, `args`, `mark` or `lane`, `to`, `len` and `shape`.
394
395  sva-cli outline @score/song
396
397  Run in a composition, outlines that score as the song a render of it is:
398  `marks` in bars and seconds, the `tempo` curve's pieces, each lane with its
399  home and every move resolved with its placement chain, how many instances it
400  reaches and how many see it move, and each placed event once, however many
401  reads reach it: its song time `at` (where it reads lanes, key and scale), when
402  it first `sounds` (later by the least, over the reads reaching it, of the
403  delays of the `t - d` reads of a score above it), its `len` in song time where
404  its line writes one, node, pitch in hertz and where each parameter comes from
405  (`line`, `lane` or `default`), and the `size`: placed events and the engine's
406  instances beside its limit.
407
408NEW:
409  sva-cli new <name> [--idempotency-key <key>]
410
411  Writes a starter composition at ./<name>, and refuses if that directory
412  exists. `--idempotency-key <key>` records the key beside the composition, so a
413  retry under the same key succeeds identically while the tree still holds what
414  was written. Any other key, or an edited tree, refuses.
415
416EXAMPLES:
417  sva-cli new song1 && cd song1
418  sva-cli render '@master' --representation samples=/tmp/song1.wav
419  sva-cli render '@master([0, 8b])' --representation 'ledger(depth=2),loudness'
420  sva-cli render '@voice/note([0, inf), f0=C4, len=2s)' \
421    --until 'envelope(t) < -60db and t > 1s' --representation samples=/tmp/note.wav
422  sva-cli render 'sample(@chord/home)' --representation 'spectrum(peaks=8)' --rate 48000
423  sva-cli render 'sample(@voice/note([0, 2s], f0=C4))' --representation pitch
424  sva-cli render '@master' --set key=G3 --set bpm=140 --set scale=dorian \
425    --representation samples=/tmp/song1-g.wav
426  sva-cli render '@master' \
427    --representation 'samples(buffer=100ms)=alsa:default,loudness'
428  sva-cli lint
429  sva-cli lint '@master'
430  sva-cli trace score/phrase
431  sva-cli outline @score/phrase
432  sva-cli builtins
433
434OUTPUT:
435  {{"status": "success", "data": {{"target": "@master([0, 8b])", "sample_rate":
436  {DEFAULT_SAMPLE_RATE}, "bits": {bits}, "profile": "psychoacoustic-v1",
437  "interval": {{"start_secs":
438  0, "end_secs": 16}}, "label": {{...}}, "written": {{"items": [...]}},
439  "representations": {{"ledger": {{...}}}}, "diagnostics": {{"items": []}}}},
440  "meta": {{"request_id": "req_...", "timestamp": 1700000000}}}}
441
442  `interval` is null where no reading read samples. An error adds "error":
443  {{"code", "message", "details": {{"count", "codes"}}}}. Success or error,
444  every response carries every finding in full at "data": {{"diagnostics":
445  {{"items": [{{"code", "severity", "message", "location", "help"}}],
446  "pagination": {{"count", "has_more", "next_cursor"}}}}}}, empty where it found
447  none.
448
449  Every collection carries that same {{items, pagination}} pair. `count` is the
450  whole reading's, `has_more` says `items` holds less than that, and
451  `next_cursor` is the interval start, as `0.5s`, the rest is read from. A
452  reading written to a file is written whole, uncapped. This page is an
453  envelope of its own, at "data": {{"help"}}.
454
455DEFAULTS:
456  --rate <hz>          the one rate a render samples at, and `1sp`.
457                       Default {DEFAULT_SAMPLE_RATE}.
458  --bits <n>           the precision every sample is written to. Default {bits},
459                       the `psychoacoustic-v1` profile's own.
460  ledger(depth=<n>)    how deep below its target a `ledger` walks.
461                       Default {DEFAULT_LEDGER_DEPTH}.
462  (peaks=<n>)          peaks a `spectrum` keeps, notes a `pitch`, formants a
463                       `formants`, stripes and novelty peaks a `self_similarity`
464                       lists per view. Default {DEFAULT_MAX_PEAKS}.
465  alias(oversample=<n>) the multiple `alias` re-renders at to hear what folded.
466                       Default {DEFAULT_OVERSAMPLE}.
467  (frame=<t>)          the step a framed reading advances by, in seconds.
468                       Default {DEFAULT_FRAME_SECS}, except `spectrum`, which sizes
469                       its own transform to the range unless it is set.
470  (floor=<db>)         the amplitude, as `-40db`, under which a harmonic reading
471                       or `self_similarity` drops a partial, and under which
472                       `self_similarity` counts a band level as zero.
473                       Default {DEFAULT_FLOOR_DB}db.
474  voice_leading(norm=<l1|l2>) how a voice leading's moves add up. Default l1.
475  dissonance(pairs=<n>) the most partial pairs one frame sums before it refuses.
476                       Default {DEFAULT_MAX_PAIRS}.
477  periodicity(window=<t>) the span of onset strength one window autocorrelates,
478                       in seconds, at least twice the longest period it reads.
479                       Default {DEFAULT_PERIODICITY_WINDOW_SECS}.
480  periodicity(curve=<0|1>) `1` adds every window's height at every lag.
481                       Default 0.
482  modulation(window=<t>) the span of band envelope one window transforms, in
483                       seconds, at least twice the slowest period it reads.
484                       Default {DEFAULT_MODULATION_WINDOW_SECS}.
485  modulation(bpm=<n>)  a tempo, as `140`, adding each rate's period in beats.
486                       Default none.
487  self_similarity(cell=<t>) the side of one matrix cell, in seconds, a whole
488                       number of frames; the target may span at most
489                       {MAX_CELLS} cells. Default {DEFAULT_CELL_SECS}.
490  self_similarity(smooth=<t>) the length each diagonal is averaged over
491                       before stripes are picked, in seconds.
492                       Default {DEFAULT_SMOOTH_SECS}.
493  self_similarity(window=<t>) the whole width of the novelty kernel, in
494                       seconds. Default {DEFAULT_NOVELTY_WINDOW_SECS}.
495  self_similarity(curve=<0|1>) `1` adds every cell's chroma and band levels and
496                       each view's matrix. Default 0.
497  bindings(node=@<path>) the instance whose bindings are read; required.
498  samples(buffer=<t>)  how much an `alsa:` device holds ahead of what it plays,
499                       in seconds. Default {DEFAULT_BUFFER_SECS}; only a device
500                       has one.
501  ledger(brief, skim)  `0` unless set `1`.
502  --format <json|text> how `lint` prints its findings: the envelope, or one
503                       terminal line each, colored where stdout is a terminal.
504                       The same objects either way. Default json.
505  --cache <path|none>  where the store lives. Default `$XDG_CACHE_HOME/sva`, else
506                       `~/.cache/sva`, holding at most {store_gb} GB; `none` keeps
507                       no store. A store that fails fails no render: it answers
508                       as without one, warned why in `diagnostics`.
509  --set <name>=<text>  a variable read as `<text>` for this render.
510                       Default none: each is read off its file.
511  --confirm            replaces a destination that already holds a file. Without
512                       it a path already taken refuses as `conflict` and nothing
513                       is written.
514
515ENVIRONMENT:
516  SVA_LOG=debug        `render` logs, once it ends, what it asked of each value
517                       to stderr; stdout and the samples are unchanged. Any
518                       other value, or none, logs nothing. One line per second
519                       of output, then one per node and a total:
520                         sva-cache pass hit=0 miss=190 ... reused=0 cum-hit=0.0%
521                         sva-cache t=1.022s hit=1 miss=2 ... cum-hit=0.5%
522                         sva-cache node hit=1 miss=0 ... reused=3 <node>
523                         sva-cache total hit=1 miss=198 ... hit-rate=0.5% ...
524                       `pass` is what was looked up before the first block.
525                       Each value is looked up once: a `hit` was answered by
526                       the store, `prefix` found a stored run up to a switch,
527                       `miss` computed it, `new` held it in memory, where the
528                       store takes what it keeps from. Each read of a value
529                       past its first is `reused`.
530
531EXIT CODES:
532  0  success (error.code absent)
533  1  internal_error (a destination could not be written)
534  3  validation_error (bad arguments, a composition that failed to parse, or a
535     render the engine refused)
536  4  conflict (a name `new` would overwrite, or a destination already holding a
537     file, without `--confirm`)
538  24 not_found (a `.wav` file, or a node this composition does not define)
539
540VERB ALIASES:
541  validate = lint, list = builtins, create = new, show = trace, from the `cli`
542  standard's own verb list. `render` and `analyze` take a reading, which that
543  list has no word for, so they keep their own names.
544
545SEE ALSO:
546  sva-cli --version    Show version information"#
547    )
548}
549
550/// One entry per reading, off the one table: its call, what it answers off, and its line.
551fn representations() -> String {
552    READINGS
553        .iter()
554        .map(|row| {
555            let keys: Vec<&str> = row.takes.iter().map(|arg| arg.key()).collect();
556            let call = match keys[..] {
557                [] => row.name.to_string(),
558                _ => format!("{}({})", row.name, keys.join(", ")),
559            };
560            let source = match row.reads {
561                Reads::ClosedForm | Reads::Structure => "exact",
562                Reads::Either => "exact off a closed form, measured off samples",
563                Reads::Samples => "measured",
564                Reads::Graph => "measured, and the graph behind the samples",
565            };
566            format!("  {call:<27}{source}\n      {}", row.help)
567        })
568        .collect::<Vec<_>>()
569        .join("\n")
570}