replace "then" with "do" in if-statements

[TeamDman]

https://discordapp.com/channels/967118679370264627/1510670827958567112/1510687465864953946

if redstone > 0 do

end

every 20 ticks do

end

simplify the memorization rules from

each then needs an end 
each do needs an end

to

each do needs an end

[TeamDman]

if bool-expr expr perhaps, with do .. end being a block expression?

input from chest
if redstone > 0 output to chest2

input from chest
if (redstone > 0) (do
  input from chest2
  output to chest3
end)
output to chest4

(parens for clarity)

no "statements", only "expressions" all the way down?

[TeamDman]

a postfix expr if bool-expr would become ambiguous with expr expr if bool-expr expr being bindable as

expr expr (if bool-expr expr)
-- or
expr (expr if bool-expr) expr

so we could have unless be a negative-if only used for postfix

expr expr unless bool-expr expr

could also just introduce a statement terminator like ; or ., letting us use unless as if not not just as a postfix

input from store output bread to chest if store has egg output 12 bread to chest

-- underspecified
input from store output bread to chest if store has egg output 12 bread to chest
-- vs
input from store. output bread to chest. if store has egg output 12 bread to chest.
-- vs
input from store. output bread to chest if store has egg. output 12 bread to chest.

-- underspecified
input from store output bread to chest unless store has egg output 12 bread to chest.
-- vs
input from store. output bread to chest unless store has egg. output 12 bread to chest.
-- vs
input from store. output bread to chest. unless store has egg output 12 bread to chest.

[TeamDman]

could replace do {} end with , {} . ?

every 20 ticks, input from chest, output to chest2, if redstone > 0, output to chest3.

that feels less gucci than

every 20 ticks do input from chest, output to chest2, if redstone > 0, output to chest3. end

but requiring the comma doesn't feel good compared to what works already

every 20 ticks do input from chest output to chest2 if redstone > 0 then output to chest3 end end

double . to close a do if would be ugly too

[TeamDman]

dank: then as a go/; operator

every 20 ticks do input from chest output to chest2 then if redstone > 0 output to chest3 end
-- the above binds as
every 20 ticks do input from chest output to chest2 then (if redstone > 0 output to chest3) end
-- vs
every 20 ticks do input from chest output to chest2 if redstone > 0 output to chest3 end
-- the above binds as
every 20 ticks do input from chest (output to chest2 if redstone > 0) output to chest3 end