#!/bin/sh

## From:
# Hi mom.how is DAD today?when he comes back HOME,tell him to cAll me; else, I will caLL him tomorrow . bye for noW.
#
#
# Hi dad . How are you ??

## to
# Hi mom. How is dad today? When he comes back home, tell him to call me; Else, I will call him tomorrow. Bye for now.
#
# Hi dad. How are you?

# PREP = Pre-processing
# POSTP = Post-processing

FILE=~/testt
# Read file, TODO: Check it exists?
VALUE=$(cat "$FILE")

# Remove duplicates of quoted characters PREP A / B
for i in "?" ";" "!" "," " "; do
   VALUE=$(echo "$VALUE" | tr -s "$i")
done

# Lowercase all letters. PREP E
VALUE=$(echo "$VALUE" | tr '[:upper:]' '[:lower:]')

# Capitalize first letter at start of line. PREP D (in a way)
VALUE=$(echo "$VALUE" | sed 's/^\s*./\U&\E/g')

# Removes all spaces before special chars
VALUE=$(echo "$VALUE" | sed 's/ \([\.!?;]\)/\1/g')

# Removes all spaces after special chars
VALUE=$(echo "$VALUE" | sed 's/\([\.!?,;]\)\s/\1/g')

# Add spaces after special chars
VALUE=$(echo "$VALUE" | sed 's/\([\.!?,;]\)/\1 /g')

# Uppercase chars after special chars (. ! ? ;) PREP D
VALUE=$(echo "$VALUE" | sed 's/[\.!?;]\s*./\U&\E/g')

# Uppercase "I"s Not a PREP, but in example output
VALUE=$(echo "$VALUE" | sed 's/\ i\ /\ I\ /g')

echo "$VALUE"