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grep -rh '^[[:space:]]*\(class\|module\)\b' api/app api/lib --include='*.rb' | sed 's/^[[:space:]]*//' | cut -d ' ' -f 2 | while read class; do echo "`grep -rl "\b$class\b" api/app api/lib --include="*.rb" | wc -l` $class"; done | sort -n

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# see here: https://superuser.com/questions/1106674/how-to-add-blank-lines-above-the-bottom-in-terminal#_=_
# the n flag on echo eliminates new line, e flag interprets the exit codes
# echo -ne "\eD" moves down and scrolls the viewport
# echo -ne "\eM" moves up and scrolls the viewport if necessary 
# "\e[B" and "\e[A" move up and down respectively constraining within the viewport
# for those two there are multipliers: "\e[3A" will repeat "\e[A" 3 times

# tput lines returns us the current number of rows in the viewport - i.e. how tall it is.

# this just doesnt seem to work

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Square.area(%Square{side: 10})
Circle.area(%Circle{radius: 10})

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defmodule Project do
  def total_cost(shape, cost_per_square_meter) do
    # code goes here ….
  end
end

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defmodule Project do
  def total_cost(shape, cost_per_square_meter) do
    case shape do
      %Square{} -> Square.area(shape) * cost_per_square_meter
      %Circle{} -> Circle.area(shape) * cost_per_square_meter
    end
  end
end

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defmodule Project do
  def total_cost(shape = %Square{}, cost_per_square_meter) do
      Square.area(shape) * cost_per_square_meter
  end
  def total_cost(shape = %Circle{}, cost_per_square_meter) do
    Circle.area(shape) * cost_per_square_meter
  end
end

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defmodule Project do
  def total_cost(shape, cost_per_square_meter) do
      Shape.area(shape) * cost_per_square_meter
  end
end

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defprotocol Shape do
  def area(shape)
end

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defimpl Shape, for: Square do
  def area(shape) do
    shape.side * shape.side
  end
end

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defimpl Shape, for: Circle do
  def area(shape) do
    shape.radius * shape.radius * 3.14
  end
end