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Pardes control filesystem
=========================
README this guide
index one line per pane: serial, kind (text|term|pdf|image), dirty flag, name (+New if unnamed), column serial
status pid, version and pane count
look write a line: a right click on it at the active pane; read: the serials it touched (this open's)
exec write a line: a middle click, an editor command word or a shell line; read the same (every exec file)
log events: new del rename save newcol delcol run exit send ask answer changed dump restore restored restoredcol msg err
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 (empty on a column tag); write a serial to give it the keyboard
ctl settings a line; or Newcol, Dump, Restore [f], Exit (asks once), Kill [w], Placement acme|pardes, size C R (--detach)
commands every builtin: its word, arg if it takes one, and root or pane: which ctl takes it
layout a line per column: serial index x width current|notcurrent empty|full pane-serials; active <serial>
tag the workspace tag, tagexec a word as a click in it; col/<serial>/ a column's tag, ctl (Delcol Joincol New Tty), exec; rmdir: empty only
pane/new open it to make a pane (named +New) in the active column, filling it if empty; the read answers its serial
pane/<n>/ name body tag ctl addr dot limit data xdata sel dirty mark scroll errors (write-only:
appended to its directory's +Errors pane) event look exec, pty/ on terminals; rmdir closes
os/, src/ the host filesystem; the editor's own sources
$m below: $NINE_MOUNT/pardes/<pid|NAME>; $NINE_MOUNT under 9ns --unix; PARDES_MOUNT in a Tty9p shell.
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 (> replaces it all)
echo notes.txt > $m/pane/$n/name; echo Save > $m/pane/$n/ctl rename, then save it
echo 'Msg hello' > $m/exec show text in the editor
echo 'Edit ,x/foo/c/bar/' > $m/pane/$n/ctl rename every foo, one undo step (sam's commands)
exec 3<>$m/log; echo follow >&3; cat <&3 what happened lately, then wait for more
echo Tty > $m/pane/$n/ctl; cat $m/index a terminal in that pane's directory
exec 3<>$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
echo 'sig INT' > $m/pane/$n/pty/ctl interrupt it; also winsize C R, and exec to restart
Pitfalls, one each:
Each open of pane/new makes another pane (ls, stat, find never do); rmdir closes even a dirty one.
addr: #n,#m, 12:5 or /re/ from the current address (^ $ per line), bytes snapped to runes; 0 resets; a miss refuses data.
data: > replaces the addr range, : > deletes it, a 2nd > inserts (addr moved); body: > empties all.
tag reads the path, then its own text; > replaces that text (default words too), >> appends.
A terminal's body is a history snapshot frozen per open, wrapped rows joined into lines; pty/data is the live stream.
exec: a non-builtin line (at most 1024 bytes) runs as a command pane (Shell -c), a shell's typed in; once whole.
Through a mount a malformed write is EINVAL, a failed one EIO or an errno that fits (ENOENT): log's err says why.
lock/unlock need a held ctl fd (exec 3>ctl); a held lock fails: retry. fs.md has the rest.
Repl python on a terminal's ctl: a .py body's clicks go to it (Repl - unbinds, Repl says it); tags stay commands.
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