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Pardes control filesystem
=========================
README this guide
index one line per pane: serial, kind (text|term|pdf|image), dirty flag, name
status pid, version and pane count
look write a line: a right click on it at the active pane; read: the serials it touched
exec write a line: a middle click, an editor command word or a shell line; read the same
log recent events: new/del/rename/save <serial> <name>, msg <serial|-> <text>; write follow to wait
screen rendered screen as JSON, frozen from open to close
listeners the session's dial addresses
focus the serial of the pane with the keyboard; write a serial to give it the keyboard
ctl the settings, one a line as a write takes them; write one, or Newcol, Dump; Kill QUITS
commands every builtin: its word, arg if it takes one, and root or pane: which ctl takes it
pane/new open it to make a pane; the read answers that pane's serial
pane/<n>/ name body tag ctl addr dot limit data xdata sel dirty mark scroll
errors event look exec, and pty/ for terminals; rmdir closes it
os/, src/ the host filesystem; the editor's own sources (-Dembed-sources=true builds only)
Below, $m is the mount point (PARDES_MOUNT in a Tty9p shell; 9ns and 9p work too):
cat $m/index which panes exist
n=$(cat $m/pane/new) make a pane, take its serial
echo /etc/hosts:3 > $m/look; cat $m/look open a file, see the pane it went to
printf 'text\n' > $m/pane/$n/body append to a pane (>| truncates first)
cat $m/pane/$n/name; echo notes.txt > $m/pane/$n/name read, then rename
echo Save > $m/pane/$n/exec save it; rmdir $m/pane/$n closes it
echo 'Msg hello' > $m/exec show text in the editor
echo '#0,#5' > $m/pane/$n/addr; printf NEW >> $m/pane/$n/data replace bytes 0..5
cp $m/pane/$n/addr $m/pane/$n/dot; cat $m/pane/$n/sel select the range, read it
exec 3<>$m/log; echo follow >&3; cat <&3 what happened lately, then wait for more
cat $m/pane/$n/event hold it open to own that pane's clicks
echo exec > $m/pane/$n/pty/ctl restart a shell; also winsize C R, sig INT
exec 3<>$m/pane/$n/pty/run; echo make >&3; cat <&3 exit N then its output; or busy, or error
printf 'ls\r' > $m/pane/$n/pty/data type into a terminal; pty/status: cols rows busy
Pitfalls, one each:
Each open of pane/new makes another pane (ls, stat, find never do); a reread names the same.
rmdir closes a pane even when it is dirty; index and pane/<n>/dirty show the flag.
addr, dot and limit read the same pair of offsets they take, so cp between them works.
dirty, mark and scroll read "0" or "1" and take "0" or "1"; truncating limit lifts it.
body: >> appends, > replaces it all. data: > replaces (and : > deletes) just the addr range.
tag reads path++text; writes append to the text (newlines too); truncating clears it, and dot or addr.
A terminal's body is a history snapshot frozen per open; pty/data is the live stream.
A failing command is reported in the editor and in log, not as a write error; a bad line fails the write.
pane/<n>/ctl: acme's status line + current; takes get, lock/unlock (on a held fd) and pane builtins (Del).
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