msinstall

#!/bin/bash
# This script's framework was created using makescript 
# version v0.15.0, dated 2019-04-11
# Makescript and its accompanying scripts are copyrighted
# by Aetesaki (c) 2018
# 
# msinstall (c) 2019 aetesaki
#
# ##################################################
# HISTORY:
# ##################################################
#
# * 2019-04-11 - v0.0.0  - First Creation
# * 2019-06-01 - v0.0.1  - continue
# * 2019-06-01 - v0.0.2  - continue
# * 2019-06-01 - v1.0.0  - INITIAL RELEASE VERSION
#
# ##################################################
# Initializing constants and variables
# ##################################################
# Setting constants
version="v1.0.0"            # Sets version variable
lastEdited="2019-06-01"     # Sets last edited variable
# Declaring variables
# Declare all variables to be used in the script 
declare destination         # Where to install the framework
declare sysop               # Super User permission required
# ##################################################
# short help function
# ##################################################
shorthelp() {
    # Edit as required
    cat << EOF
Usage: msinstall [-au]
       msinstall --help
       msinstall --version"
EOF
}
# ##################################################
# no arguments gives short help
# ##################################################
if [ "$#" == "0" ]; then
    shorthelp
    exit 1
fi 
# ##################################################
# -- help
# ##################################################
if [ "$1" == "--help" ]; then
    shorthelp
    # Write options and explanations
    cat << EOF
   --help                 Displays this text and exit.
   --version              Displays the version of the script and exit.

   -a, --all              Installs the makescript framework in
                          /usr/local/bin
                          OVERRIDDEN by the -u, --user option
   -u, --user             Installs the makescript framework in
                          $HOME/bin
                          OVERRIDES the -a, --all option
EOF
    exit 0
fi 
# ##################################################
# -- version
# ##################################################
if [ "$1" == "--version" ]; then
    cat << EOF
msinstall ${version}, dated ${lastEdited} 
Part of the makescript suite by Aetesaki. PRE-RELEASE VERSION
(c) 2019 aetesaki

Option iteration section lifted from
https://natelandau.com/boilerplate-shell-script-template
EOF
    exit 0
fi
# ##################################################
# Options
#
# Iterate over options breaking -ab into -a -b when 
# needed and --foo=bar into --foo bar. Lifted from 
# https://natelandau.com/boilerplate-shell-script-template/
# ##################################################
optstring=h
while (($#)); do
  case $1 in
    # If option is of type -ab
    -[!-]?*)
      # Loop over each character starting with the second
      for ((i=1; i < ${#1}; i++)); do
        c=${1:i:1}

        # Add current char to options
        options+=("-$c")

        # If option takes a required argument, and it's not the last char make
        # the rest of the string its argument
        if [[ $optstring = *"$c:"* && ${1:i+1} ]]; then
          options+=("+${1:i+1}")
          break
        fi
      done
      ;;

    # If option is of type --foo=bar
    --?*=*) options+=("${1%%=*}" "${1#*=}") ;;
    # add --endopts for --
    --) options+=(--endopts) ;;
    # Otherwise, nothing special
    *) options+=("$1") ;;
  esac
  shift
done
set -- "${options[@]}"
unset options
# Read the options and set stuff
while [[ $1 = -?* ]]; do
  case $1 in
    # insert cases 
    # use shift; to catch arguments in $1
    -a|--all)  destination="/opt/makescript"; sysop=1 ;;
    -u|--user) destination="$HOME/bin"; sysop=0 ;;
    *) echo "ERROR: option $1 is not valid."; exit 1;; 
  esac
  shift
done

# ##################################################
# Copy executable function
# ##################################################
# Copy file using sudo, depending on destination
copyx() {
    # Check if sudo required
    if [ $sysop ]; then
        # copy using sudo
        sudo cp -ru $1 $2
    else
        # copy normally
        cp -ru $1 $2
    fi
}


# ##################################################
# Copy function
# ##################################################
# Copies and set executable bit
copy() {
    echo "# Installing $1"
    # Check if file exist at destination
    if [ -f "$2"/"$1" ]; then
        # if file exist update if older
        echo "# - updating $1 at $2"
    else
        # else copy file to destination
        echo "# - copying $1 to $2"
    fi
    # executing copy
    copyx $1 $2
}

# ##################################################
# Main section
# ##################################################
# Initial message
cat << EOF
##################################################
# The makescript framework will be installed in
# $destination
# Support files will be installed in
# $destination/.support
# 
EOF
# Check if install directory does not exist
if [ ! -d "$destination" ]; then
    # if not check for sudo 
    if [ $sysop ]; then
        # create the directory using sudo
        sudo mkdir -p $destination/.support
    else
        # create the directory
        mkdir -p $destination/.support
    fi
fi
copy makescript $destination
copy editscript $destination
copy .support/.empty $destination/.support
copy .support/.header $destination/.support
copy .support/.help $destination/.support
copy .support/.main $destination/.support
copy .support/.options $destination/.support
copy .support/.shorthelp $destination/.support
copy .support/.version $destination/.support
copy .support/.version.noop $destination/.support
copy .support/.version.op $destination/.support
copy .support/msedit $destination/.support
# if installing for all users
if [ $sysop ]; then
    # create links for makescript and editscript in /usr/local/bin
    pushd /usr/local/bin > /dev/null
    echo "# Creating links in /usr/local/bin"
    sudo ln -s $destination/makescript
    sudo ln -s $destination/editscript
    popd > /dev/null
fi
cat << EOF
#
# The makescript framework has been installed
##################################################
EOF