# `@`...`` — a word that names a COMMAND instead of a file to open. The
# delimiters are config.cmd_open/cmd_close and nothing else in the editor knows
# how one is spelled.
#
# A backtick is not a file char, so the ordinary word expansion would stop dead
# inside one and hand a look the fragment `echo`. config.wordBounds takes the
# whole run instead, which is what makes a single CLICK the way you invoke one
# (acme does the same for its own `<`/`|`/`>` command words).
#
# EXECUTE runs it and leaves you where you were; LOOK runs it and lands you in
# the shell that answered — looking at a thing means being shown it, and a
# directory's look has always been exactly that (a shell there, ls'd).
#
# And Look and Exec are ORDINARY BUILTINS now, so their names are executable
# words like Save or Grep: `Look p.txt` run off the page is the same look a
# right click on `p.txt` is. Which is also what makes `@`Look .`` nest — Exec
# unwraps it and the contents go straight back through the one dispatcher.
file cmds.txt @`echo ZZ''E` @`echo ZZ''L` Look p.txt @`Look .`
file p.txt just text
file zzmark.txt x
start 31 120 cmds.txt
wait 8000 Newcol Joincol
wait 8000 cmds.txt
stable 700 20000
snap opened
# a single middle CLICK inside the run (col 11 is inside `echo`) expands to the
# whole `@`echo ZZ''E`` and executes it in a shell; focus stays on the file
press middle 11 4
release middle 11 4
wait 10000 ZZE
stable 700 15000
snap atexec
# LOOK on the second one (col 24, inside its `echo`) runs it too AND focuses
# the shell that answered — that is the whole difference between the two verbs
press right 24 4
release right 24 4
wait 10000 ZZL
stable 700 15000
snap atlook
# `Look p.txt` middle-dragged: the builtin by NAME, with an argument
press middle 36 4
drag middle 45 4
release middle 45 4
wait 10000 just text
stable 700 15000
snap lookword
# nesting: `@`Look .`` — Exec unwraps it, `Look .` is parsed as the ordinary
# Look builtin with an argument, and Look opens the directory (an existing
# shell there, ls'd — zzmark.txt is only ever in that listing)
press middle 49 4
release middle 49 4
wait 10000 zzmark.txt
stable 700 15000
snap nested
# the same syntax typed into a TAG — the other place the expansion has to know
# about backticks (tagChordText). The look above left the shell focused, so `:`
# opens ITS tag; `i` then End walks to the end of the tail, and the chord runs
# the word under the cursor exactly as the body's does.
key :
key i
key end
key space
text Exec
key left
key tab
stable 700 8000
# ...except that word is `Exec` ITSELF, with nothing to execute. This is the
# case that must not hang a re-entrant dispatcher: it runs out of argument
# immediately and does nothing at all.
snap execword
key end
key space
text @`echo ZZ''T`
key left
key tab
wait 10000 ZZT
stable 700 15000
snap tagcmd