morsh/morsh

#!/bin/sh
# -. --- - .. -.-. . / -- . / -- . . .--. . .-.
# shellcheck disable=SC2086,SC1083,SC2154
# SC2086 - required for IFS replacement
# SC1083 - required for eval
# SC2154 - eval sets $cur
IFS=""; LANG=C
# index's
index="A:B:C:D:E:F:G:H:I:J:K:L:M:N:O:P:Q:R:S:T:U:V:W:X:Y:Z:1:2:3:4:5:6:7:8:9:0: " # 36 items
indexl="a:b:c:d:e:f:g:h:i:j:k:l:m:n:o:p:q:r:s:t:u:v:w:x:y:z:1:2:3:4:5:6:7:8:9:0: " # lowercase index for ascii
exb=".-:-...:-.-.:-..:.:..-.:--.:....:..:.---:-.-:.-..:--:-.:---:.--.:--.-:.-.:...:-:..-:...-:.--:-..-:-.--:--..:.----:..---:...--:....-:.....:-....:--...:---..:----.:-----:/"

ma() {
  eval letter=\${$#}
  eval cur=\${$letter}; [ "$cur" = 37 ] && cur=" " # IFS=": " causes #37 in $index to be lost
  printf '%s' "${cur}"
}

am() {
  IFS=""
  eval letter=\${$#};
  [ $letter -gt 37 ] && : $((letter-=37))
  eval cur=\${$letter}; printf '%s ' "$cur"
}

unset bang; line=1; while read -r p || [ -n "$p" ]; do
  p=${p# }; p=${p% }
  [ "$line" -eq 1 -o "$bang" ] 2>/dev/null && { # start comment check # this is basically a shitpost lol
    case "$p" in
      '#'!*) bang=" ";;
      '#'?-*|'#'?.*) p="${p#\#}"; printf '%sl: %s\n# ' "${bang# }" "${line}"
      bang='
'     # big hack to add newlines to start if >1
      n1="0"; IFS=": "; for i in ${p}; do
        for ii in $exb; do
          : $((n1+=1));
          case "$ii" in
            "$i") ma ${index} "$n1"
          esac
        done
        n1=0
      done ;;
    esac # this only converts morse
    [ "$bang" ] && p="?"
  }
  case "$p" in
    "") echo ;; # skip empty lines
    -*|.*)
      # for morse to ascii
      n1="0"; IFS=": "; for i in ${p}; do
        for ii in $exb; do 
          : $((n1+=1));
          case "$ii" in 
            "$i") ma ${index} "$n1"
          esac
        done
        n1=0
      done ;;
    *)
      # ascii to morse
      while [ "$p" ]; do
        next="${p#?}"; # ${p%$next} is the current letter
        IFS=":"; na="0"; for ai in ${index} ${indexl}; do
          # echo $ai
          : $((na+=1))
          case "${p%$next}" in
            "$ai") am $exb $na; break;;
          esac
        done
        na=0
        p="$next"
      done
    ;;
  esac
  : $((line+=1))
done # stdin read; fuck you
echo