class AudioTrimmer

# File lib/audio_trimmer.rb, line 8
def initialize(params = {})
        input = params.fetch(:input, "")
        input_length = 0              
        if input.empty? 
                raise "please specify input filepath"
        else
                @input = File.expand_path(input)
        end   
end

# File lib/audio_trimmer.rb, line 33
def get_length file_path
        return `soxi -D #{File.expand_path(file_path)}`.to_f
end

# File lib/audio_trimmer.rb, line 18
def trim(start: 0, finish: get_length(@input), output: "")
        unless File.exists?(@input) or File.exists?(output) then raise "bad filepath" end
        if output.empty? or File.expand_path(output)  == @input
                out_arr = @input.split('.')
                out_arr[out_arr.length-2] += "_out" 
                output = out_arr.join(".")
                `sox #{@input} #{output} trim #{start} =#{finish}`
                `mv #{output} #{@input}`
        else
                output = File.expand_path(output)
                `sox #{@input} #{output} trim #{start} =#{finish}`
        end
        return "trim success"
end