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Pardes control filesystem
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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 one line per editor event (new/del/rename/save <serial> <name>); reads wait
screen rendered screen as JSON, frozen from open to close
listeners the session's dial addresses
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/ the host filesystem
src/ the editor's own sources, only in a -Dembed-sources=true build
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; echo 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
cat $m/pane/$n/dirty; echo 0 > $m/pane/$n/dirty is it modified? say it is not
cat $m/log block until a pane is made, renamed, saved or closed
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
Pitfalls, one each:
Each open of pane/new makes another pane; two reads of one fid name the same one.
Only that open creates: ls, stat, find and every other read leave the tree alone.
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.
Writing body appends; open it with truncation to replace; writes are whole UTF-8 sequences.
Truncating tag clears the part you may edit; truncating dot or addr empties it.
A terminal's body is a history snapshot frozen per open; pty/data is the live stream.
screen is frozen per open handle as well; reopen it for a fresh frame.
A failing command is reported in the editor, not as a write error; a bad line fails the write.
pane/<n>/ctl reads acme's window status line and takes one verb, get, which reloads from disk.
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