app-rename

#!/bin/bash

# Verify that the user has entered an application name as a program argument
if [[ $# -eq 0 ]] || [[ $# -gt 2 ]]; then
        echo "Either none or too many arguments have been specified!"
	echo "Run as './app-rename new_app_name' or './app-rename old_app_name new_app_name'"
	echo "The first run possibility assumes that the project name is 'gost'"
        exit
fi

# Set the application names that will be used for the renaming
if [[ $# -eq 1 ]]; then
	if [[ "$1" = "--help" ]]; then
		echo "This is a script initially built to easily rename the 'gost' web server template from github.com/coddo/gost"
		echo "Use the script with the --help argument to view this usage information"
		echo "If you want to rename 'gost', then run the script with one argument, representing the new name that you want to give to the application"
		echo "If you want to rename another Golang project, then you need to run the script with 2 arguments, representing the current application's name and the new name that you want to give it"
		exit
	else
		OldAppName="gost" # Assume that the project is 'gost' and not something else
		AppName=$1
	fi
elif [[ $# -eq 2 ]]; then
	OldAppName=$1
	AppName=$2
fi

if [[ "${PWD##*/}" = $OldAppName ]]; then
        echo "The script must be run from outside the project directory!"
	echo "Cd out using 'cd..' and run the script as './$OldAppName/app-rename [arguments...]"
        exit
fi

if [[ ! -d $OldAppName ]]; then
	echo "The '$OldAppName' project is not present in the current directory!"
	echo "If the Golang app you want to rename is not '$OldAppName' then you should run the script with 2 arguments: old_app_name new_app_name"
	exit
fi

# Process a file by renaming all the $OldAppName instances in it with the new application name
processFile() {
        local File=$1
	local Content=$(cat $File)

	echo "${Content//$OldAppName/$AppName}" > $File

        echo "$File - DONE"
}

# Process all the files inside the application
processAllFiles() {
	local FilesString=$1

	IFS=' ' read -ra Files <<< $FilesString
	for File in "${Files[@]}"; do
                processFile $File
	done
}

echo

echo "Processing files:"
processAllFiles "$(find -type f | grep '\.go$')"

echo

# Rename the 'gost' folder
mv "#OldAppName/$OldAppName" "$OldAppName/$AppName"
echo "Renaming the '$OldAppName'(main) folder - DONE"

# Rename the base dir name
mv "$OldAppName" "$AppName"
echo "Renaming the project directory - DONE"

echo
echo "Finished renaming the app to $AppName"