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#!/usr/bin/ruby
#
# See ../README.md
#
#
# Run as: ruby ch-2.rb < input-file
#
#
# We're reading a start time, the current time, and a file name
# from STDIN, separated by white space. The file contains the
# tracks played.
#
ARGF . each_line do |_|
start_time, end_time, file_name = _ . split
#
# Ruby automatically creates big integers if necessary.
#
time_diff = (end_time . to_i - start_time . to_i) * 1000
tracks = []
total_time = 0
File . open (file_name) do |f|
f . each_line do |track|
run_time, title = track . split ',', 2
run_time = run_time . to_i
total_time += run_time
tracks . push [run_time, title]
end
end
#
# We're not interested in playing full loops.
#
time_diff %= total_time
#
# Find the current track playing. If $time_diff is less than the
# play time of the track, this is the track currently playing. If
# so, print the track name (with quotes, as given in the example --
# although they don't belong there, as they're from the CSV encoding;
# for that reason, we won't deescape anything else either). Otherwise
# (track length is shorter than $time_diff), we subtrack the length
# of the track from $time_diff, and continue checking the next track.
#
tracks . each do |track|
if time_diff - track [0] < 0
time_diff = (time_diff / 1000) . to_i
hours = (time_diff / 3600) . to_i
minutes = ((time_diff % 3600) / 60) . to_i
seconds = time_diff % 60
puts (track [1])
if hours > 0
puts "%02d:%02d:%02d" % [hours, minutes, seconds]
else
puts "%02d:%02d" % [ minutes, seconds]
end
break
else
time_diff -= track [0]
end
end
end
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