Script to install my other scripts

install.sh

#!/usr/bin/env bash
# shellcheck disable=SC2016,SC2012

Script=Script_Name

bin=bin
config=bin/config


# TODO
# What if the user does not have a home folder ???
# Can't create bin and profile in home!
# Install in /usr/local/bin with chmod 755 ???


Cyan='\e[0;36m'
Off=$'\e[0m'

# If shell is BusyBox and not bash then advise how to install bash on Asustor NAS
Shell=$(/proc/self/exe --version 2>/dev/null | grep "GNU bash" | cut -d "," -f1)
if [ "$Shell" != "GNU bash" ]; then
    echo -e "\nYou need to install bash to be able to run this script.\n"
    echo "1. Install Entware from App Central"
    echo "2. Run the following commands in a shell:"
    echo "opkg update && opkg upgrade"
    echo -e "opkg install bash\n"
    exit 1
fi

if [[ -d "$HOME" ]]; then
    echo -e "${Cyan}Do you want to install for:${Off}"
    echo -e "${Cyan}1)${Off} All users"
    echo -e "${Cyan}2)${Off} Just $(whoami)"
    read -r answer
    if [[ ${answer,,} == "1" ]]; then
        path=/usr/local
        perms=755
    else
        path="$HOME"
        perms=700
    fi
else
    path=/usr/local
    perms=755
fi

echo -e "${Cyan}Remove .sh extension?${Off} [y/n]"
read -r answer
if [[ ${answer,,} == "y" ]]; then remove_ext=yes; fi


function makedir() {
    if [[ -n "$1" ]] && [[ ! -d "$1" ]]; then
        mkdir "$1" || { echo "Failed to create $1"; exit 1; }
        echo "Created $1"
    fi
    return
}

makedir "$path/$bin"

# Is it okay to create a config folder inside the bin folder?
makedir "$path/$config"


# Should I only change the home/bin permissions if I created the bin folder?
if [[ -d "$path/$bin" ]]; then
    # Check current permissions
    chmod "$perms" "$path/$bin" ||\
        { echo "Failed to set permissions on $path/$bin"; exit 1; }
fi

# Should I only change the config permissions if I created the config folder?
if [[ -d "$path/$config" ]]; then
    # Check current permissions
    chmod "$perms" "$path/$config" ||\
        { echo "Failed to set permissions on $path/$config"; exit 1; }
fi


cd "$(dirname "$0")" || { echo "cd $(dirname "$0") failed!"; exit 1; }

# Add script's files to array
shopt -s lastpipe
filelist=()
find . -maxdepth 1 \( -iname "*.sh" -o -iname "*.config" -o -iname "*.txt" \) -print0 |\
    while IFS=  read -r -d $'\0'; do filelist+=("$REPLY"); done; declare -p filelist >/dev/null

# Remove install.sh and upgrade.sh from the array
num="0"
while [[ $num -lt "${#filelist[@]}" ]]; do
    if [[ ${filelist[num]} == "./install.sh" ]] ||\
        [[ ${filelist[num]} == "./upgrade.sh" ]]; then
        unset "filelist[num]"
    fi
    num=$((num +1))
done
# Contract array to remove indexes with no elements left after we unset elements 
filelist=( "${filelist[@]}" )

# Check filelist array isn't empty
if [[ ${#filelist[@]} -gt "0" ]]; then
    echo "Installing $Script files:"
else
    echo "No $Script files to copy!"
    exit 1
fi


# Copy script's files to bin and set permissions
num="0"
while [[ $num -lt "${#filelist[@]}" ]]; do
    f="${filelist[num]}"
    filename=$(basename "$f")
    echo -e "${Cyan}$((num +1)))${Off} $filename"  # debug
    if [[ ${f##*.} == "sh" ]] && [[ $filename != "$(basename -- "$0")" ]]; then
        if [[ $remove_ext == "yes" ]]; then
            file="$path/$bin/${f%.*}"  # remove .sh
        else
            file="$path/$bin/$f"
        fi
        if cp -pu "$f" "$file"; then
            chmod "$perms" "$file" || echo "Failed to set permissions on $file"
        else
            echo "Failed to copy $file"
        fi
    fi
    if [[ ${f##*.} == "txt" ]]; then
        # Ask before overwriting .txt files in /bin/config
        if [[ ! -f "$path/$config/$f" ]]; then
            if cp -ipu "$f" "$path/$config/$f"; then
                chmod "$perms" "$path/$config/$f" ||\
                    echo "Failed to set permissions on $path/$config/$f"
            else
                echo "Failed to copy $f"
            fi
        fi
    fi
    if [[ ${f##*.} == "config" ]]; then
        if [[ -f "$path/$config/$f" ]]; then
            # Edit existing file to include new settings
            # We copy existing non-default values to new file
            # then overwrite existing file with edited new file
            while read -r line; do
                if [[ "$line" =~ ^[a-zA-Z0-9_]+=.* ]]; then
                    name=$(printf %s "$line" | cut -d'=' -f 1)
                    line="${line//\//\\/}"  # Replace / with \/ in variable for sed
                    line="${line/ /\\ }"    # Replace spaces with '\ ' in variable for sed
                    sed -i -e 's/^'"$name"'=.*/'"$line"'/g' "$f"
                fi
            done <"$path/$config/$f"
        fi
        # Copy .config files to /bin/config
        if [[ ! -f "$path/$config/$f" ]]; then
            if cp -pu "$f" "$path/$config/$f"; then
                chmod "$perms" "$path/$config/$f" ||\
                    echo "Failed to set permissions on $path/$config/$f"
            else
                echo "Failed to copy $f"
            fi
        fi
    fi
    num=$((num +1))
done


# Add "export PATH=$PATH:$HOME/bin" if needed
if [[ $path == "$HOME" ]]; then
    cd "$HOME" || { echo "cd $path failed!"; exit 1; }

    # Find highest precedence "profile" file
    if [[ -f ".bash_profile" ]]; then
        profile=".bash_profile"
    elif [[ -f ".bash_login" ]]; then
        profile=".bash_login"
    elif [[ -f ".profile" ]]; then
        profile=".profile"
    else
        touch ".bash_profile"
        profile=".bash_profile"
    fi

    # Check if "export PATH=$PATH:$HOME/bin" in profile
    if [[ -f "$HOME/$profile" ]]; then
        while read -r line; do
            if [[ $line == 'export PATH=$PATH:$HOME/'$bin ]]; then
                echo -e "\nPath already exists in $profile"
                addpath=no
            break
            else
                addpath=yes
            fi
        done <"$HOME/$profile"
        if [[ ! -s "$HOME/$profile" ]]; then
            # File is empty
            addpath=yes
        fi
    else
        echo -e "\n$HOME/$profile not found!" 
    fi

    # Add "export PATH=$PATH:$HOME/bin" if needed
    if [[ $addpath == "yes" ]]; then
        echo 'export PATH=$PATH:$HOME/'$bin >> "$profile"
        # Check we successfully added path
        while read -r line; do
            if [[ $line == 'export PATH=$PATH:$HOME/'$bin ]]; then
                echo -e "\nAdded path to $profile"
                break
            fi
        done <"$HOME/$profile"
    fi
fi


echo -e "\nFinished installing. You can run the script with:"
if [[ $remove_ext == "yes" ]]; then
    echo -e "${Cyan}sudo i $Script${Off}\n"
else
    echo -e "${Cyan}sudo i $Script.sh${Off}\n"
fi

exit