#!/usr/bin/ruby
#
#scvim [the executable]
#
#Copyright 2008 Alex Norman
#
#This file is part of SCVIM.
#
#SCVIM is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#
#SCVIM is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with SCVIM.  If not, see <http://www.gnu.org/licenses/>.

require 'optparse'

vim = "vim"
homercfile = File.join(ENV["HOME"], ".scvimrc")
localrcfile = "/usr/local/share/scvim/scvimrc"
usrrcfile = "/usr/share/scvim/scvimrc"

#do we use graphical mode
graphical = false
#the location of the rc file to source
rcloc = nil

# debian-based systems do not activate vim plugins automatically, we must check
#if %x[which vim-addons]!="" && %x[vim-addons -q status supercollider | grep installed]==""
#  puts "scvim has detected that you haven't activated the vim supercollider plugin."
#  puts "to enable scvim to work, please execute either "
#  puts "    vim-addons install supercollider"
#  puts "to enable it for the current user, or "
#  puts "    sudo vim-addons -w install supercollider"
#  puts "to enable it system-wide."
#  puts ""
#  puts "Would you like me to run \"vim-addons install supercollider\" for you?"
#  puts "Press 'y' and then Enter if so.  Otherwise just press Enter to exit."
#  userreply = gets.chomp
#  if userreply == 'y'
#    %x[vim-addons install supercollider]
#  else
#    exit
#  end
#end

opts = OptionParser.new do |opts|
  #the usage banner
  opts.banner = "Usage: #{$0} [OPTION]... [FILE]..."

  #the options
  opts.on("-g", "--graphical", "Use vim -g") do
    graphical = true
  end
  opts.on("-r", "--rcfile rcfile", "Use the file indicated as the scvim configuration file") do |f|
    if File.exists?(f)
      rcloc = f
    else
      STDERR.puts "rcfile #{f} does not exists, aborting"; exit
    end
  end
  opts.on_tail("-h", "--help", "Show this message") do
    puts opts; exit
  end
end

#parse the command line options
begin
  opts.parse!(ARGV)
rescue => e
  STDERR.puts e.to_s
  STDERR.puts opts.to_s
  exit
end

unless rcloc
  #find the rc file
  if File.exists?(homercfile)
    rcloc = homercfile
  elsif File.exists?(localrcfile)
    rcloc = localrcfile
  elsif File.exists?(usrrcfile)
    rcloc = usrrcfile
  else
    #no rc file found, no user customizations
    #hopefully ftplugin/supercollider.vim is in the vimruntime
    STDERR.puts "scvimrc file not found"
    unless graphical
      exec(vim, "-c", "set filetype=supercollider | runtime ftplugin/supercollider.vim | SClangStart", *ARGV)
    else
      exec(vim, "-g", "-c", "set filetype=supercollider | runtime ftplugin/supercollider.vim | SClangStart", *ARGV)
    end
  end
end

puts "scvim: sourcing #{rcloc}"

vimops = ["--cmd", "source #{rcloc}", 
	  "-c", "set filetype=supercollider | runtime ftplugin/supercollider.vim | SClangStart", 
	  *ARGV]

#add -g if we're going graphical
vimops = ["-g"] + vimops if graphical

#see if the vim install supports servers
if IO.popen("vim --version") {|f| f.readlines.flatten.join(" ").include?("+clientserver")}
	vimops = ["--servername", "scvim"] + vimops
end

#actually execute
exec(vim, *vimops)