bandsaunter/packaging/make-browse-man.py

#!/usr/bin/env python3
"""Generate the saunterbrowse manual page.

Hand-written rather than generated from a table: unlike the scanner, the
browser's surface is a dozen keys and five flags, and describing those is
prose, not a listing.  The version and date still come from the program, so
the page cannot claim to document a release that was never built.
"""
import sys
from datetime import date
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

import bandsaunter                              # noqa: E402
from bandsaunter.browse import PLAYERS, SORTS   # noqa: E402


PAGE = r'''.\" Generated by packaging/make-browse-man.py -- do not edit by hand.
.TH SAUNTERBROWSE 1 "{date}" "bandsaunter {version}" "User Commands"
.SH NAME
saunterbrowse \- read and listen to what a bandsaunter scan collected
.SH SYNOPSIS
.B saunterbrowse
.RI [ DIRECTORY ]
.RB [ \-\-sort
.IR ORDER ]
.RB [ \-\-filter
.IR TEXT ]
.RB [ \-\-player
.IR CMD ]
.RB [ \-\-list ]
.RB [ \-\-callsigns ]
.RB [ \-\-no\-lookup ]
.SH DESCRIPTION
A scan leaves a directory of recordings. Beside each one is a JSON file
holding what the classifier made of it, and for speech a transcript of what
was said. Reading that by hand means opening files one at a time and guessing
which are worth playing.
.PP
.B saunterbrowse
shows them as a list you move through with the arrow keys. The transcript of
whichever recording is highlighted fills the top of the screen, because that
is the part you actually want to read; underneath it are the identification,
the bands the frequency falls in, and the list itself. Pressing Enter plays
the recording.
.PP
With no
.I DIRECTORY
it opens the one the scanner writes to, taken from your saved settings, so it
normally needs no arguments at all.
.PP
It only ever reads. Nothing in the recordings directory is renamed, moved or
deleted.
.SH KEYS
.TP
.B "Up Down k j"
Move through the recordings.
.TP
.B "PgUp PgDn"
A screenful at a time.
.TP
.B "Home End"
The first and the last.
.TP
.B Enter
Play the highlighted recording. Playing a second one stops the first: two
players talking over each other is worse than either alone.
.TP
.B Space
Stop playing. With nothing playing, it starts, like Enter.
.TP
.B t
Read the whole transcript full screen, scrolling with the arrow keys. Useful
for a long net, where the panel at the top can only show the first few lines
\[em] it says so when there is more.
.TP
.B /
Filter. What you type is matched against the frequency, the filename, the
identification and
.I everything that was said,
so "was the repeater mentioned" is a question you can ask directly. Enter
accepts, Escape clears.
.TP
.B s
Cycle the order: {sorts}.
.TP
.B r
Re-read the directory. A scan running in another window is still writing to
it, and this picks up what has arrived since.
.TP
.B o
Print the highlighted recording's path and quit, for piping into something
else.
.TP
.B "? h"
The list of keys, and which audio player was found.
.TP
.B q
Quit. With a filter in force, Escape clears the filter first.
.SH OPTIONS
.TP
.BI DIRECTORY
Where the recordings are. Defaults to the scanner's output directory, or to
.B $BANDSAUNTER_OUTPUT
when that is set.
.TP
.BI \-\-sort " ORDER"
Start in this order: {sorts}. Time is newest first; duration is longest
first.
.TP
.BI \-\-filter " TEXT"
Start with only the recordings matching this, exactly as if it had been typed
at the
.B /
prompt.
.TP
.BI \-\-player " CMD"
The command used to play a recording. The path is appended as its last
argument. By default the first of these that is installed is used:
{players}.
.TP
.B \-\-callsigns
Print every callsign heard in the directory, with the licence it belongs to
and where and when it was heard, then exit.
.TP
.B \-\-no\-lookup
Do not contact the licence database. Callsigns are still found and still
described from their prefix; only the name and address are missing.
.TP
.B \-\-list
Print one line per recording and exit, without drawing anything. This is what
to use over a pipe, in a script, or anywhere there is no terminal.
.TP
.B \-V ", " \-\-version
Print the version and exit.
.SH SOUND
Playback is handed to whichever player is installed rather than done in the
program: the recordings are ordinary WAV files, every desktop already has
something that plays them, and a browser that cannot start is worse than one
that cannot play. If none is found, everything else still works and the
message says which packages would fix it.
.PP
Over ssh there is usually no sound server at the far end. The browser and its
transcripts work regardless; only Enter has nothing to do.
.SH DETECTED CALLSIGNS
Under the transcript, headed
.BR "DETECTED CALLSIGNS:" ,
is every callsign heard in it, with the name and location on the licence.
.PP
Finding them is not a matter of one regular expression over the text as
written. A speech recogniser is poor at callsigns \[em] they are not words,
they are said one character at a time \[em] so it breaks them wherever the
speaker paused and writes the phonetic alphabet down verbatim. "KU 0W",
"K7 RA" and "kilo uniform zero whiskey" are all one callsign each, and all
three are read back correctly.
.PP
False positives are the thing to avoid: a browser that invents callsigns is
worse than one that finds none. So a run of words is only accepted when none
of its parts is an ordinary English word \[em] "or 3. Can you open 4" fits the
shape once the punctuation is gone, and is not a callsign \[em] while a single
token said in one breath is trusted, because W1BOY is a perfectly good
callsign.
.PP
The lookup uses the FCC's own licence data, published at callook.info, which
needs no account and no key. The callsign is the only thing sent, results are
cached under
.I ~/.cache/bandsaunter/
so the same net is looked up once however many nights it is recorded, and a
lookup never delays the display: the entry says "looking up" and fills itself
in.
.PP
.B \-\-no\-lookup
contacts nothing at all. Callsigns are still found, and still described from
their own structure \[em] the prefix is allocated by the ITU and the digit is
the US licensing district, so a callsign says which country and which region
it belongs to without any database. Outside the United States that is all
there is; callook.info holds US licences only.
.PP
.B \-\-callsigns
prints every callsign in the directory, who it belongs to, and each frequency
and time it was heard on, then exits.
.PP
US amateur licence records are public by law, and include the licensee's
address. That is what is shown.
.SH TRANSCRIPTS
A transcript appears only where a recogniser produced one, which means the
capture was judged to be speech and
.B bandsaunter\-transcribe
was installed at the time. Where there is none, the panel says which of the
several reasons applies \[em] Morse, data, a bare carrier, or speech that was
never offered to a recogniser \[em] because those want different things done
about them.
.PP
Two places can hold the text: the JSON sidecar records what was recognised
during the scan, and the
.I _transcription.txt
beside the recording is what a later re\-run wrote. The file wins, being the
more recent of the two.
.SH FILES
.TP
.I ~/bandsaunter/
Where recordings are written, unless the saved settings say otherwise.
.TP
.IR frequency \-\- date _ time \- modulation .wav
A recording.
.TP
.IR ... .json
Its measurements and identification.
.TP
.IR ... _transcription.txt
What was said, where a recogniser heard speech.
.SH ENVIRONMENT
.TP
.B BANDSAUNTER_OUTPUT
The directory to open, overriding the saved settings.
.SH EXAMPLES
.PP
.RS
.EX
saunterbrowse
.EE
.RE
.PP
Open the scanner's output directory.
.PP
.RS
.EX
saunterbrowse /mnt/recordings \-\-sort frequency
.EE
.RE
.PP
Browse somewhere else, grouped by channel rather than by time.
.PP
.RS
.EX
saunterbrowse \-\-list | grep \-i "mile marker"
.EE
.RE
.PP
Search the transcripts from a script.
.PP
.RS
.EX
saunterbrowse \-\-callsigns
.EE
.RE
.PP
Everyone who identified themselves, and where they were heard.
.SH EXIT STATUS
0 on a clean exit, 1 when the directory holds no recordings, 2 when it does
not exist or there is no terminal to draw on.
.SH SEE ALSO
.BR bandsaunter (1)
.SH BUGS
The list is read when the browser opens.  Press
.B r
to pick up recordings a running scan has written since.
'''


def main() -> int:
    text = PAGE.format(
        date=date.today().isoformat(),
        version=bandsaunter.__version__,
        sorts=", ".join(SORTS),
        players=", ".join(name for name, _ in PLAYERS))
    text = text.replace("\n\n", "\n")          # troff dislikes blank lines
    target = Path(sys.argv[1] if len(sys.argv) > 1
                  else Path(__file__).parent / "saunterbrowse.1")
    target.write_text(text)
    print(target)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())