Select fzf notation for bind reload command dynamically

Depending on what characters can be found in the command fed to
fzf, select the separator character for bind that does not
exist in the provided command string.

Falls back to `#` if all possible separators are present in the
command string.

bin/jq-repl

@@ -22,6 +22,14 @@ else
   export FZF_JQ_REPL_COMMAND="jq-paths < \"$input\""
 fi
 
+fzf_notation_types="~!@#$%^&*;/|"
+skip_notation="$(echo "$FZF_JQ_REPL_COMMAND" | sed -E "s,[^$fzf_notation_types],,g")"
+fzf_notation="$(echo "$fzf_notation_types" | sed -E "s,[$skip_notation],,g" | head -c 1)"
+if [ -z "$fzf_notation" ]; then
+  # fall back to default and hope for the best
+  fzf_notation="#"
+fi
+
 eval "$FZF_JQ_REPL_COMMAND" |
   fzf \
     --preview "jq --color-output ${JQ_REPL_ARGS:-} {q} \"$input\"" \
@@ -30,4 +38,4 @@ eval "$FZF_JQ_REPL_COMMAND" |
     --query="." \
     --bind "tab:replace-query,return:print-query" \
     --bind "alt-up:preview-page-up,alt-down:preview-page-down" \
-    --bind "ctrl-r:reload#$FZF_JQ_REPL_COMMAND#+refresh-preview"
+    --bind "ctrl-r:reload${fzf_notation}${FZF_JQ_REPL_COMMAND}${fzf_notation}+refresh-preview"