evaluate j syntax directly in zsh prompt

j-eval.zsh

# Reset color after command execution
preexec() {
  echo -ne "\e[0m"
}


# J language interceptor using ZLE
j-line-intercept() {
  local cmd="$BUFFER"
  if [[ "$cmd" = "j "* ]]; then
    local j_code="${cmd#j }"
    BUFFER=""
    zle accept-line
    print -s "j $j_code"
    preexec # <- defined earlier to reset color
    echo "\n\n   $j_code"
    echo "$j_code" | /Applications/j9.4/bin/jconsole
  else
    zle .accept-line
  fi
}

# Create the ZLE widget
zle -N accept-line j-line-intercept

# Plain function for when j is called directly
j() {
  if [ $# -eq 0 ]; then
    # If no arguments, just run interactive jconsole
    /Applications/j9.4/bin/jconsole
  else
    echo -ne "\e[0m"
    echo "\n\n   $*"
    echo "$*" | /Applications/j9.4/bin/jconsole
  fi
}