cli: A bit clearner array and iter prompt

pkg/interp/interp.jq

@@ -231,7 +231,7 @@ def _prompt:
       , if length > 0 then (.[0] | _type_name_error) else empty end
       , if length > 1 then ", ..." else empty end
       , "]"
-      , "[\(length)]"
+      , if length > 1 then "[\(length)]" else empty end
       )
     end;
   ( [ (_options_stack | length | if . > 2 then ((.-2) * ">") + " " else empty end)
@@ -243,7 +243,7 @@ def _prompt:
         , _preview
         )
       end
-    , if length > 1 then ", ..." else empty end
+    , if length > 1 then ", [\(length)]" else empty end
     , "> "
     ]
   ) | join("");

pkg/interp/testdata/inputs.fqtest

@@ -78,11 +78,11 @@ exitcode: 4
 stderr:
 error: /a: failed to decode (probe), try -d FORMAT to force
 $ fq -i -d raw . /a /b /c
-raw, ...> ._format
+raw, [3]> ._format
 "raw"
 "raw"
 "raw"
-raw, ...> ^D
+raw, [3]> ^D
 $ fq -i -s -d raw . /a /b /c
 [raw, ...][3]> .[]._format
 "raw"

pkg/interp/testdata/repl.fqtest

@@ -12,11 +12,25 @@ null> 1 | repl
 2
 > number> ^D
 null> [1,2,3] | repl({}; .[])
-> number, ...> .
+> number, [3]> .
 1
 2
 3
-> number, ...> ^D
+> number, [3]> ^D
+null> [[1,2,3]] | repl({}; .[])
+> [number, ...][3]> .
+[
+  1,
+  2,
+  3
+]
+> [number, ...][3]> ^D
+null> [[1]] | repl({}; .[])
+> [number]> .
+[
+  1
+]
+> [number]> ^D
 null> [] | repl({}; .[])
 > empty> 1
 > empty> ^D