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require 'optparse'
require 'open-uri'
require 'nokogiri'
require 'yaml'
require 'json'
@output = []
@line = nil
@from_station = nil
@to_station = nil
@weight = 'peak_time'
@change_time = 5
@colour = false
debug = false
help = false
ops = nil
VERSION = 'v1.3.0'
INFINITY = 1 << 64
WEIGHTS = ['distance','peak_time','off_peak_time','unimpeded_time']
STDIN.gets.split(' ').each{|arg| ARGV << arg} if ARGV == []
args = ARGV.dup
options = OptionParser.new do |opts|
opts.banner = "Usage: #{File.basename($0)} -h"
opts.on( '-s', '--status [LINE]', 'Get the current status of a tube line.' ) {|l| @line = l || 'SUMMARY' }
opts.on( '-f', '--from-station STATION', 'Find route from this station.' ) {|f| @from_station = f }
opts.on( '-t', '--to-station STATION', 'Find route to this station.' ) {|t| @to_station = t }
opts.on( '-w', '--weight WEIGHT', 'Shortest route using either distance, peak_time, off_peak_time or unimpeded_time.' ) {|w| @weight = WEIGHTS.include?(w) ? w : 'peak_time' }
opts.on( '-c', '--change-time TIME', 'Your expected average change time in minutes.' ) {|c| @change_time = c.to_f.round(2) }
opts.on( '-C', '--colour', 'Enable line colours in the output.' ) { @colour = true }
opts.on( '-d', '--debug', 'Display debug info.' ) { debug = true }
opts.on( '-v', '--version', 'blatube version number.' ) { puts VERSION; exit }
opts.on( '-h', '--help', 'Display this screen.' ) { help = true; ops = opts }
end;options.parse!
@output << "args: #{args.inspect}" if debug
if args == []
@output << "Usage: #{File.basename($0)} -h"
puts @output.join ' '
exit -1
end
class Array
def pairs
pairs = []
self.each_with_index do |element, index|
pairs << [element,self[index+1]]
end
pairs.pop
pairs
end
end
#TODO: add via_station
def calculate_shortest_route
return unless interpret_user_input
@shortest_route = []
add_terminals
calculate_routes
traverse_route @to_station.upcase
build_route_output
end
def interpret_user_input
stations = @graph.keys.map {|station| station.split('_')[0]}.uniq.sort
found_from_station, @from_station = interpret stations, @from_station
found_to_station, @to_station = interpret stations, @to_station
return found_from_station && found_to_station
end
def interpret options, input
found_station = false
if options.include?(input.upcase)
found_input = true
elsif (most_likely = options.map {|option| option.match("^#{input.upcase}.*") ? option : nil}.compact) != []
if most_likely.size == 1
input = most_likely.first
found_input = true
else
@output << "Did you mean: #{most_likely.map {|option| option.split(' ').map {|word| word.capitalize}.join(' ')}.join(', ')}?"
end
elsif (less_likely = options.map {|option| option.match(".*#{input.upcase}.*") ? option : nil}.compact) != []
if less_likely.size == 1
input = less_likely.first
found_input = true
else
@output << "Did you mean: #{less_likely.map {|option| option.split(' ').map {|word| word.capitalize}.join(' ')}.join(', ')}?"
end
else
@output << "Could not find a match for '#{input}'."
end
return found_input, input
end
def add_terminals
@graph.find_all {|station, data| station.match /^#{@to_station.upcase}_|^#{@from_station.upcase}_/}.each do |station, data|
if station.match @from_station.upcase
@graph[station][@from_station.upcase] = {'line' => station.split('_')[1], 'direction' => nil, 'distance' => 0, 'unimpeded_time' => 0, 'peak_time' => 0, 'off_peak_time' => 0}
@graph[@from_station.upcase] ||= {}
@graph[@from_station.upcase][station] = {'line' => station.split('_')[1], 'direction' => nil, 'distance' => 0, 'unimpeded_time' => 0, 'peak_time' => 0, 'off_peak_time' => 0}
elsif station.match @to_station.upcase
@graph[station][@to_station.upcase] = {'line' => station.split('_')[1], 'direction' => nil, 'distance' => 0, 'unimpeded_time' => 0, 'peak_time' => 0, 'off_peak_time' => 0}
@graph[@to_station.upcase] ||= {}
@graph[@to_station.upcase][station] = {'line' => station.split('_')[1], 'direction' => nil, 'distance' => 0, 'unimpeded_time' => 0, 'peak_time' => 0, 'off_peak_time' => 0}
end
end
end
def calculate_routes
add_change_time unless @weight == 'distance'
run_algorithm @graph, @graph.keys, @from_station.upcase
end
#TODO: changes on the same line (eg. 'CAMDEN TOWN')
def add_change_time
@graph.each do |from_station,to_stations|
next unless current_line = from_station.split('_')[1]
to_stations.each do |to_station,data|
data[@weight] += @change_time unless data['line'] == current_line
end
end
end
def run_algorithm graph, nodes, start_node
@distances = Hash.new INFINITY
@routes = Hash.new -1
@distances[start_node] = 0
nodes_size = nodes.size
while nodes_size > 0
current_node = nodes.first
nodes.each {|node| current_node = node if @distances[node] < @distances[current_node]}
break if @distances[current_node] == INFINITY
nodes.delete current_node
nodes_size -= 1
graph[current_node].keys.each do |next_node|
new_distance = @distances[current_node] + graph[current_node][next_node][@weight]
if new_distance < @distances[next_node]
@distances[next_node] = new_distance
@routes[next_node] = current_node
end
end
end
@distances.delete_if {|node, distance| distance == INFINITY}
end
def traverse_route to_station
if @routes[to_station] != -1
traverse_route @routes[to_station]
end
@shortest_route << to_station
end
#TODO: a nicer way of doing this
def build_route_output
line_colours = @colour ? YAML::load(File.open('line_colours.yaml')) : Hash.new('')
verbose_route = ''
pairs = @shortest_route[1..-2].pairs
from,to = pairs.first
current_line = @graph[from][to]['line']
verbose_route << "#{line_colours[current_line]}#{from.split('_')[0]} - #{current_line} (#{@graph[from][to]['direction']})"
pairs[1..-2].each do |from,to|
next if (new_line = @graph[from][to]['line']) == current_line || @graph[from][to]['direction'] == nil
current_line = new_line
from_s = from.split('_')[0]
from_1 = from_s[0..(from_s.length/2.0 - 1)]
from_2 = from_s[(from_s.length/2.0)..-1]
verbose_route << " - #{from_1}#{line_colours['reset_colour']}#{line_colours[new_line]}#{from_2} - #{new_line} (#{@graph[from][to]['direction']})"
end
from,to = pairs.last
new_line = @graph[from][to]['line']
from_s = from.split('_')[0]
from_1 = from_s[0..(from_s.length/2.0 - 1)]
from_2 = from_s[(from_s.length/2.0)..-1]
verbose_route << " - #{from_1}#{line_colours['reset_colour']}#{line_colours[new_line]}#{from_2} - #{new_line} (#{@graph[from][to]['direction']})" unless new_line == current_line
verbose_route << " - #{to.split('_')[0]}#{line_colours['reset_colour']}"
@output << verbose_route
if @weight == 'distance'
@output << "Distance: #{@distances[@to_station.upcase].round(2)} km"
else
minutes = @distances[@to_station.upcase].round(2)
seconds = (minutes - minutes.to_i) * 60
@output << "Travel Time: #{minutes.to_i}:#{seconds.round}"
end
end
def get_line_status
xml = Nokogiri::HTML(open('http://cloud.tfl.gov.uk/TrackerNet/LineStatus')).remove_namespaces!
sorted_lines = xml.xpath('//linestatus').sort_by {|xml| xml.xpath('.//line/@name').text}
found_line, line = interpret sorted_lines.map{|xml| xml.xpath('.//line/@name').text.upcase} << 'SUMMARY', @line.upcase
return unless found_line
if @line == 'SUMMARY'
line_summary = ''
sorted_lines.each {|xml| line_summary << "#{xml.xpath('.//line/@name').text}: #{xml.xpath('./@statusdetails').text} " unless xml.xpath('./@statusdetails').text == ''}
@output << (line_summary == '' ? 'Good Serice on all lines.' : "#{line_summary}Good Service on all other lines.")
else
l_s_xml = sorted_lines.find {|xml| xml.xpath('.//line/@name').text.upcase.match line}
@output << ("#{l_s_xml.xpath('.//line/@name').text}: #{l_s_xml.xpath('.//status/@description').text}. #{l_s_xml.xpath('./@statusdetails').text}")
end
end
#TODO: store graph as yaml in a way that works with add_change_time
begin
if help
ops.to_s.split(/\n\s*|\s{2,}/).each{|opt| @output << opt}
elsif @line
get_line_status
elsif @from_station && @to_station
#@graph = YAML::load(File.open('graph.yaml'))
@graph = JSON.parse(File.open('graph.json').read)
calculate_shortest_route
elsif @from_station || @to_station
@output << 'Please specify the station you are travelling from (-f) and the station you are travelling to (-t).'
elsif ARGV.size == 2
#@graph = YAML::load(File.open('graph.yaml'))
@graph = JSON.parse(File.open('graph.json').read)
@from_station = ARGV[0]
@to_station = ARGV[1]
calculate_shortest_route
elsif ARGV.size == 1
@line = ARGV[0]
get_line_status
else
get_line_status
end
rescue StandardError => e
@output << e.message
puts e.message
puts e.backtrace
ensure
puts @output.join ' '
end
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