#!/bin/bash

# 2020.2.16 funnychar ver 0.4
# kanata

IFS='
'

help(){
  echo 'ex) echo abcABC|'$0' -u U+1D468'
  echo 'ex) '$0' -p [pattern_number] abcABC'
  echo "    pattern_number is .."
  cat $0 |grep "^    \"[1-9]"|tr -d '"=;'|sed 's/CP/U+/g'
}

changecode(){
  declare -A funnytable
  funnytable[" "]=" "
  CP="$1"

  if [ "$CP" = "FF21" ] # Pattern 1
  then
    for WORD in `echo {A..Z}|tr -d " "|grep -o .`
    do
      funnytable["$WORD"]=$(printf "&#x$CP;"|nkf --numchar-input)
      CP=$(echo "obase=16;ibase=16; $CP+1"|bc)
    done
    CP="FF41"
    for WORD in `echo {a..z}|tr -d " "|grep -o .`
    do
      funnytable["$WORD"]=$(printf "&#x$CP;"|nkf --numchar-input)
      CP=$(echo "obase=16;ibase=16; $CP+1"|bc)
    done
  elif [ "$CP" = "1F110" ] # Pattern 15
  then
    for WORD in `echo {A..Z}|tr -d " "|grep -o .`
    do
      funnytable["$WORD"]=$(printf "&#x$CP;"|nkf --numchar-input)
      CP=$(echo "obase=16;ibase=16; $CP+1"|bc)
    done
    CP="249C"
    for WORD in `echo {a..z}|tr -d " "|grep -o .`
    do
      funnytable["$WORD"]=$(printf "&#x$CP;"|nkf --numchar-input)
      CP=$(echo "obase=16;ibase=16; $CP+1"|bc)
    done
  elif echo "$CP"|grep -e "1F130" -e "1F150" -e "1F170" -e "1F1E6" >/dev/null # Patten 17,18,19
  then
    for WORD in `echo {A..Z}|tr -d " "|grep -o .`
    do
      funnytable["$WORD"]=$(printf "&#x$CP;"|nkf --numchar-input)
      CP=$(echo "obase=16;ibase=16; $CP+1"|bc)
    done
  else
    for WORD in `echo {A..Z} {a..z}|tr -d " "|grep -o .`
    do
      funnytable["$WORD"]=$(printf "&#x$CP;"|nkf --numchar-input)
      if [ "$CP" = "1D455" ];then funnytable["$WORD"]=$(printf "ℎ"|nkf --numchar-input);fi # Pattern 3 [h]
      if [ "$CP" = "1D49D" ];then funnytable["$WORD"]=$(printf "ℬ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4A0" ];then funnytable["$WORD"]=$(printf "ℰ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4A1" ];then funnytable["$WORD"]=$(printf "ℱ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4A3" ];then funnytable["$WORD"]=$(printf "ℋ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4A4" ];then funnytable["$WORD"]=$(printf "ℐ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4A7" ];then funnytable["$WORD"]=$(printf "ℒ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4A8" ];then funnytable["$WORD"]=$(printf "ℳ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4AD" ];then funnytable["$WORD"]=$(printf "ℛ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4BA" ];then funnytable["$WORD"]=$(printf "ℯ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4BC" ];then funnytable["$WORD"]=$(printf "ℊ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D4C4" ];then funnytable["$WORD"]=$(printf "ℴ"|nkf --numchar-input);fi # Pattern 5
      if [ "$CP" = "1D506" ];then funnytable["$WORD"]=$(printf "ℭ"|nkf --numchar-input);fi # Pattern 7
      if [ "$CP" = "1D50B" ];then funnytable["$WORD"]=$(printf "ℌ"|nkf --numchar-input);fi # Pattern 7
      if [ "$CP" = "1D50C" ];then funnytable["$WORD"]=$(printf "ℑ"|nkf --numchar-input);fi # Pattern 7
      if [ "$CP" = "1D515" ];then funnytable["$WORD"]=$(printf "ℜ"|nkf --numchar-input);fi # Pattern 7
      if [ "$CP" = "1D51D" ];then funnytable["$WORD"]=$(printf "ℨ"|nkf --numchar-input);fi # Pattern 7
      if [ "$CP" = "1D53A" ];then funnytable["$WORD"]=$(printf "ℂ"|nkf --numchar-input);fi # Pattern 8
      if [ "$CP" = "1D53F" ];then funnytable["$WORD"]=$(printf "ℍ"|nkf --numchar-input);fi # Pattern 8
      if [ "$CP" = "1D545" ];then funnytable["$WORD"]=$(printf "ℕ"|nkf --numchar-input);fi # Pattern 8
      if [ "$CP" = "1D547" ];then funnytable["$WORD"]=$(printf "ℙ"|nkf --numchar-input);fi # Pattern 8
      if [ "$CP" = "1D548" ];then funnytable["$WORD"]=$(printf "ℚ"|nkf --numchar-input);fi # Pattern 8
      if [ "$CP" = "1D549" ];then funnytable["$WORD"]=$(printf "ℝ"|nkf --numchar-input);fi # Pattern 8
      if [ "$CP" = "1D551" ];then funnytable["$WORD"]=$(printf "ℤ"|nkf --numchar-input);fi # Pattern 8
      CP=$(echo "obase=16;ibase=16; $CP+1"|bc)
    done
  fi

  for WORD in `echo "$2"|grep -o .`
  do
    if [ -z "${funnytable[$WORD]}" ]
    then
     echo -n $WORD
    else
      echo -n ${funnytable["$WORD"]}
    fi
  done
  echo
}

if echo "$@" |grep -e '^-h' -e '^--help' >/dev/null
then
  help
  exit 0
fi

if [ "$#" -lt 2 ]
then
  help
  exit 0
fi

if echo "$1" |grep '^-u' >/dev/null
then
  if [ -p /dev/stdin ] ; then
    changecode $(echo $2|tr -d 'U+') "$(cat -)"
  else
    changecode $(echo $2|tr -d 'U+') "$3$4$5$6$7$8$9"
  fi
  exit 0
elif echo "$1" |grep '^-p' >/dev/null
then
  case "$2" in
    "1") CP="FF21";;  #ＡＢＣａｂｃ
    "2") CP="1D400";; #𝐀𝐁𝐂𝐚𝐛𝐜
    "3") CP="1D434";; #𝐴𝐵𝐶𝑎𝑏𝑐
    "4") CP="1D468";; #𝑨𝑩𝑪𝒂𝒃𝒄
    "5") CP="1D49C";; #𝒜ℬ𝒞𝒶𝒷𝒸
    "6") CP="1D4D0";; #𝓐𝓑𝓒𝓪𝓫𝓬
    "7") CP="1D504";; #𝔄𝔅ℭ𝔞𝔟𝔠
    "8") CP="1D538";; #𝔸𝔹ℂ𝕒𝕓𝕔
    "9") CP="1D56C";; #𝕬𝕭𝕮𝖆𝖇𝖈
    "10") CP="1D5A0";; #𝖠𝖡𝖢𝖺𝖻𝖼
    "11") CP="1D5D4";; #𝗔𝗕𝗖𝗮𝗯𝗰
    "12") CP="1D608";; #𝘈𝘉𝘊𝘢𝘣𝘤
    "13") CP="1D63C";; #𝘼𝘽𝘾𝙖𝙗𝙘
    "14") CP="1D670";; #𝙰𝙱𝙲𝚊𝚋𝚌
    "15") CP="1F110";; #🄐🄑🄒
    "16") CP="24B6";;  #ⒶⒷⒸⓐⓑⓒ
    "17") CP="1F130";; #🄰🄱🄲
    "18") CP="1F150";; #🅐🅑🅒
    "19") CP="1F170";; #🅰🅱🅲
    "20") CP="1F1E6";; #🇦🇧🇨
    * ) help;exit 1;;
  esac
  if [ -p /dev/stdin ] ; then
    changecode "$CP" "$(cat -)"
  else
    #changecode "$CP" "$3$4$5$6$7$8$9"
    GLOBIGNORE=*
    changecode "$CP"  "$3$4$5$6$7$8$9"
    unset GLOBIGNORE
  fi
  exit 0
else
  help
fi

exit 0