Spit out some single-code-point random emoji or all of them to the terminal

emojify.sh

#!/bin/zsh

# Requires bash 4.2 or Zsh 4.3
#
# Usage: $0 [count]
# 
# Dump count (or, if not given, all) single-code-point emoji to the terminal given a reference file
# in $EMOJI_REF or ~/emoji-latest.txt

# Get this reference file from https://www.unicode.org/Public/emoji/latest/emoji-test.txt
ref=${EMOJI_REF:-~/emoji-latest.txt}

if [[ $1 != "" ]] then
  nLines=$1
fi

IFS=$'\n' emojiCodes=($(cat $ref |
  grep fully-qualified | # only fully-qualified ones
  grep -v 'flag' |  # these are mostly broken
  sed -E 's/^(.*) *;.*/\1/g' |   # grab just the token
  sed -e 's/ *$//' | # kill trailing spaces
  grep -v ' '  # don't bother with multiple code point emoji, they generally don't render in the terminal
))

printEmoji() {
  local line=$1
  eval echo -n $(echo \$\'\\U$1\')
}

if [[ $nLines != "" ]]; then
    for j in $(seq 1 $nLines); do
      ss=($RANDOM % $numCodes)
      printEmoji "${emojiCodes[$RANDOM % ${#emojiCodes[@]} + 1]}"
    done

else
    while IFS= read -r line; do
      printEmoji $line
    done <<< "$emojiCodes"
fi