rootrails [-h] <model_name || table_name> [<search_string>]

This program sets the application root in a Ruby-on-Rails 'config/routes.rb' file.

    The first compulsory argument is the table or model name. If the Model name is
    given, it will be converted to lowercase and pluralized. <table_name> format is
    to be preferred.

    The second argument is the search string, which defaults to 'welcome#index'

    You will be given a chance to revise the input before any changes are made

      -h: get help

    REQUIREMENTS
       Execute from the root directory of the rails app

    EXAMPLE USAGE
      rootrails Product
      rootrails products
      rootrails commodities 'products#index'

    NOTE
       Pluralization is not very clever. An 's' is added to a word that does not
       end in 's'.  'Product' is converted to 'products'
END

#!/bin/bash
declare search_string=${2-'welcome#index'}
usage () {
cat <<END

    rootrails [-h] <model_name || table_name> [<search_string>]

This program sets the application root in a Ruby-on-Rails 'config/routes.rb' file.

    The first compulsory argument is the table or model name. If the Model name is
    given, it will be converted to lowercase and pluralized. <table_name> format is
    to be preferred.

    The second argument is the search string, which defaults to 'welcome#index'

    You will be given a chance to revise the input before any changes are made

      -h: get help

    REQUIREMENTS
       Execute from the root directory of the rails app

    EXAMPLE USAGE
      rootrails Product
      rootrails products
      rootrails commodities 'products#index'

    NOTE
       Pluralization is not very clever. An 's' is added to a word that does not
       end in 's'.  'Product' is converted to 'products'
END
}

## Set options
while getopts ":h" opt; do
 case $opt in
    h)
     usage
     exit 1
      ;;
  esac
done

check_rails_directory() {

    declare count_key_rails_files=$(ls | grep -c '^app$\|^config$')

    if [[ ${count_key_rails_files} -ne 2 ]]; then
        echo "You do not appear to be in the root directory of a Rails app"
        exit 1
    fi
}

check_string_presence () {

    declare string_count="$(grep -c $1 $2)"

    if [[ string_count -eq 1 ]]; then
        echo "String ${1} found OK ..."
    else
        echo "String ${1} NOT found in ${2}"
        sed -n '/#\{0,2\}[[:space:]]\{0,10\} root.*#/p' config/routes.rb
        exit 1
    fi
}

checkargs () {

    if [[ $1 -eq 0 ]]; then
        echo "Argument required"
        exit 1
    fi
}

to_lowercase_and_pluralize () {

    declare lower_case_input="${1,,}"
    declare last_letter_input="${lower_case_input: -1}"

    if [[ ${last_letter_input} != "s" ]]; then
        echo "${lower_case_input}s"
    else
        echo "${lower_case_input}"
    fi
}

declare proposed_change_to="$(to_lowercase_and_pluralize $1)#index"

make_change () {

        sed -i "s/${search_string}/${proposed_change_to}/" config/routes.rb
        sed -i 's/#\{1,2\}[[:space:]]\{0,10\}root/\ root/' config/routes.rb
        echo "Requested changes made in 'config/routes.rb'"
        exit 0
}

user_choice () {

    read -p  " '${search_string}'  will be changed to '${proposed_change_to}'. Do you wish to make this change? [Y/n]?" userchoice

    if [[ $userchoice == "Y" ||  $userchoice == "Yes" ]]; then
        make_change
    else
        user_input_choice
    fi
  }

user_input_choice () {

    read -p  "Change '${proposed_change_to}' to <YOUR_CHOICE> [E to Exit]" userchoice
    if [[ $userchoice == "E" ||  $userchoice == "Exit" ]]; then
        echo "Exit by user choice"
        exit 1
    else
        proposed_change_to=${userchoice}
        user_choice
    fi
  }

check_rails_directory
checkargs ${#}
check_string_presence ${search_string} 'config/routes.rb'
user_choice