Claudio Ortolina
7cf9b4e7f8
- spec public functions (skipping controllers, views, live views and components) - use types instead of explanations in docs - remove redundant docs - fix typos
63 lines
1.4 KiB
Elixir
63 lines
1.4 KiB
Elixir
defmodule MusicLibraryWeb.Duration do
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@moduledoc """
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Formats durations from milliseconds to human-readable strings.
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"""
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@doc """
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Formats a duration in milliseconds as a human-readable string.
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## Examples
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iex> MusicLibraryWeb.Duration.format_duration(30_000)
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"0:30"
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iex> MusicLibraryWeb.Duration.format_duration(90_000)
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"1:30"
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iex> MusicLibraryWeb.Duration.format_duration(3_723_000)
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"1:02:03"
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iex> MusicLibraryWeb.Duration.format_duration(0)
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"0:00"
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"""
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@spec format_duration(non_neg_integer()) :: String.t()
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def format_duration(milliseconds) do
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milliseconds
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|> System.convert_time_unit(:millisecond, :second)
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|> format_seconds()
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end
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defp format_seconds(seconds) when seconds <= 59 do
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"0:#{zero_pad(seconds)}"
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end
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defp format_seconds(seconds) do
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minutes = div(seconds, 60)
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remaining_seconds = rem(seconds, 60)
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format_minutes(minutes, remaining_seconds)
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end
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defp format_minutes(minutes, seconds) when minutes <= 59 do
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"#{minutes}:#{zero_pad(seconds)}"
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end
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defp format_minutes(minutes, seconds) do
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hours = div(minutes, 60)
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remaining_minutes = rem(minutes, 60)
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format_hours(hours, remaining_minutes, seconds)
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end
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defp format_hours(hours, minutes, seconds) do
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"#{hours}:#{zero_pad(minutes)}:#{zero_pad(seconds)}"
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end
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defp zero_pad(integer) do
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integer
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|> to_string()
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|> String.pad_leading(2, "0")
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end
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end
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