#!/usr/bin/env ruby

# This is a simple shell. Part of KitOS
# Made by Sakireth
#
# This is licensed under the GNU GPL, available in COPYING

# Initialization
# Includes
require 'readline'
include Readline

conf = {}
conf['dirs'] = {}
conf['files'] = {}
conf['vars'] = {}

# Configuration
# Directories
#conf['dirs']['home'] = ENV['HOME']
conf['dirs']['home'] = '/home/robin/programmas/ruby/projects/kitos/shell'
conf['dirs']['kitdir'] = conf['dirs']['home'] + '/.kit'
# Files
conf['files']['rc'] = conf['dirs']['kitdir'] + '/kitshellrc'

# Default configuration
conf['vars']['prompt'] = '>> '
conf['vars']['debug'] = true

# Check if the kit main directory exists. If not, create it.
if File::directory?(conf['dirs']['kitdir']) == false
  Dir::mkdir(conf['dirs']['kitdir'])
end

# Now, load the RC file, containing handy user settings. (If it exists. If not, create it.)
if File::file?(conf['files']['rc'])
  eval(File::read(conf['files']['rc']))
else
  File::open(conf['files']['rc'], 'w').close
end

# Start the main loop, asking for the input.
while true
  input = readline(conf['vars']['prompt'], TRUE).strip

  # To get arguments, we may want to split the input.
  input_splitted = input.split
  if input_splitted.length > 1
    args = input_splitted[1..-1].join(' ')
  end

  # If debugging is on, print the arguments.
  p args if conf['vars']['debug']

  # The commands which don't need arguments
  case input_splitted[0]
    when 'exit'
      exit
    when 'kitosrc'
      puts eval(File::read(conf['files']['rc']))
    else
      system(input)
  end

  # Here begin all the commands which need arguments.
  if input_splitted.length > 1
    case input_splitted[0]
      when 'cd'
        if args != ''
          if File::directory?(args)
            Dir::chdir(args)
          else
            puts 'Directory doesn\'t exist.'
          end
        else
          puts 'Switching to home directory' if conf['vars']['debug']
          Dir::chdir(conf['dirs']['home'])
        end
      when 'set'
        eval("#{input_splitted[1]} = #{input_splitted[2]}")
      when 'eval'
        eval(args)
    end
  end

  input = nil
  input_splitted = nil
end