#!/bin/bash

function replace_apos() {
    # Desc: Replace ' with ʼ in text
    # Usage: source bkt-replace_apos; replace_apos [FILE]
    # Note: In UTF-8 text file, replaces U+0027
    #   APOSTROPHE with U+02BC MODIFIER LETTER APOSTROPHE
    # Input: stdin
    #        arg1   file path
    # Output: stdout
    # Version: 1.3.0 (BK-2020-03)
    # Depends: GNU sed 4.8

    # Check input
    if [[ "$#" -gt 1 ]]; then
        echo "FATAL:Incorrect argument count:$#" 1>&2;
        return 1;
    fi;

    if [[ -f "$1" ]]; then
        # Use specified file
        input="$1";
    else
        # Use standard input
        input="-";
    fi;

    # Perform substitutions
    ## Note: See https://en.wiktionary.org/wiki/Category:English_contractions
    ## Note: Order of replacements sorted most-specific first.
    sed -E \
        -e "s/(you|You|YOU)['’](ren|REN|ven|VEN)['’](t|T)/\1ʼ\2ʼ\3/g" \
        -e "s/(you|You|YOU)['’](dn|DN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3ʼ\4/g" \
        -e "s/(you|You|YOU)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(you|You|YOU)['’](d|D|ll|LL|re|RE|ve|VE)/\1ʼ\2/g" \
        -e "s/(y|Y)['’](all|ALL)['’](dn|DN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3ʼ\4ʼ\5/g" \
        -e "s/(y|Y)['’](all|ALL)['’](d|D)['’](nt|NT)['’](ve|VE)/\1ʼ\2ʼ\3ʼ\4ʼ\5/g" \
        -e "s/(y|Y)['’](all|ALL)['’](d|D)['’](ve|VE)/\1ʼ\2ʼ\3ʼ\4/g" \
        -e "s/(y|Y)['’](all|ALL)['’](d|D|ll|LL|re|RE|ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(y|Y)['’](all|ALL)/\1ʼ\2/g" \
        -e "s/(y|Y)['’](ain|AIN)['’](t|T)/\1ʼ\2ʼ\3/g" \
        -e "s/(wouldn|Wouldn|WOULDN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(wouldn|Wouldn|WOULDN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(won|Won|WON)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(won|Won|WON)['’](t|T)/\1ʼ\2/g" \
        -e "s/(who|Who|WHO)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(who|Who|WHO)['’](d|D|ll|LL|re|RE|s|S|ve|VE)/\1ʼ\2/g" \
        -e "s/(where|Where|WHERE)['’](d|D|s|S)/\1ʼ\2/g" \
        -e "s/(what|What|WHAT)['’](ll|LL|re|RE|s|S|ve|VE)/\1ʼ\2/g" \
        -e "s/(weren|Weren|WEREN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(we|We|WE)['’](ven|VEN)['’](t|T)/\1ʼ\2ʼ\3/g" \
        -e "s/(we|We|WE)['’](ren|REN)['’](t|T)/\1ʼ\2ʼ\3/g" \
        -e "s/(we|We|WE)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(we|We|WE)['’](d|D|ll|LL|re|RE|ve|VE)/\1ʼ\2/g" \
        -e "s/(wasn|Wasn|WASN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(they|They|THEY)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(they|They|THEY)['’](d|D|ll|LL|re|RE|ve|VE)/\1ʼ\2/g" \
        -e "s/(there|There|THERE)['’](ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(there|There|THERE)['’](s|S|ve|VE)/\1ʼ\2/g" \
        -e "s/(that|That|THAT)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(that|That|THAT)['’](d|D|ll|LL|s|S)/\1ʼ\2/g" \
        -e "s/(shouldn|Shouldn|SHOULDN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(shouldn|Shouldn|SHOULDN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(she|She|SHE)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(she|She|SHE)['’](d|D|ll|LL|s|S)/\1ʼ\2/g" \
        -e "s/(shan|Shan|SHAN)['’](t|T)/\1ʼ\2/g" \
        -e "s/['’](s|S)\b/ʼ\1/g" \
        -e "s/(s|S)['’]( |,|.|$)/\1ʼ\2/g" \
        -e "s/(oughtn|Oughtn|OUGHTN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(oughtn|Oughtn|OUGHTN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(o|O)['’](clock|CLOCK)/\1ʼ\2/g" \
        -e "s/(mustn|Mustn|MUSTN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(mustn|Mustn|MUSTN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(mustn|Mustn|MUSTN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(mightn|Mightn|MIGHTN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(mightn|Mightn|MIGHTN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(might|Might|MIGHT)['’](ve|VE)/\1ʼ\2/g" \
        -e "s/(let|Let|LET)['’](s|S)/\1ʼ\2/g" \
        -e "s/(it|It|IT)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(it|It|IT)['’](d|D|ll|LL|s|S)/\1ʼ\2/g" \
        -e "s/(isn|Isn|ISN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(I|i)['’](dn|DN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3ʼ\4/g" \
        -e "s/(I|i)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(I|i)['’](d|D|ll|LL|m|M|ve|VE)/\1ʼ\2/g" \
        -e "s/(how|How|HOW)['’](d|D)/\1ʼ\2/g" \
        -e "s/(he|He|HE)['’](d|D|ll|LL)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(he|He|HE)['’](d|D|ll|LL|s|S)/\1ʼ\2/g" \
        -e "s/(haven|Haven|HAVEN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(hasn|Hasn|HASN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(hadn|Hadn|HADN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(hadn|Hadn|HADN)['’](t|T)/\1ʼ\2/g" \
        -e "s/['’](em\b)/ʼ\1/g" \
        -e "s/(d|D)['’](ya|YA|you|YOU)/\1ʼ\2/g" \
        -e "s/([[:alnum:]])['’](d|D)/\1ʼ\2/g" \
        -e "s/(don|Don|DON)['’](t|T)/\1ʼ\2/g" \
        -e "s/(doesn|Doesn|DOESN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(didn|Didn|DIDN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(could|Could|COULD)['’](ve|VE)/\1ʼ\2/g" \
        -e "s/(couldn|Couldn|COULDN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(couldn|Couldn|COULDN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(c|C)['’](mere|MERE)/\1ʼ\2/g" \
        -e "s/(can|Can|CAN)['’](t|T)['’](ve|VE)/\1ʼ\2ʼ\3/g" \
        -e "s/(can|Can|CAN)['’](t|T)/\1ʼ\2/g" \
        -e "s/['’](cause|Cause|CAUSE)/ʼ\1/g" \
        -e "s/['’](bout|Bout|BOUT)/ʼ\1/g" \
        -e "s/(aren|Aren|AREN)['’](t|T)/\1ʼ\2/g" \
        -e "s/(ate|Ate|ATE)['’](nt|NT)/\1ʼ\2/g" \
        -e "s/(ain|Ain|AIN)['’](t|T)/\1ʼ\2/g" \
        -e "s/([[:alpha:]])['’]([[:alpha:]])/\1ʼ\2/g" \
        "$input"
}; # replace ' with ʼ

# Author: Steven Baltakatei Sandoval
# License: GPLv3+