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sigma_kit

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An Appplication kit for Phoenix based applications. SigmaKit Provides UI components, helpers, and opinionated frameowrk extensions for quickly devloping rich Phoenix LiveView based applications.

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sigma_kit lib util string.ex
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lib/util/string.ex 

defmodule SigmaKit.Util.String do

  def truncate(text, options \\ []) do

    len = options[:length] || 30

    omi = options[:omission] || "..."



    cond do

      !String.valid?(text) ->

        text



      String.length(text) < len ->

        text



      true ->

        len_with_omi = len - String.length(omi)



        stop =

          if options[:separator] do

            rindex(text, options[:separator], len_with_omi) || len_with_omi

          else

            len_with_omi

          end



        "#{String.slice(text, 0, stop)}#{omi}"

    end

  end



  defp rindex(text, str, offset) do

    text = String.slice(text, 0, offset)

    reversed = String.reverse(text)

    matchword = String.reverse(str)



    case :binary.match(reversed, matchword) do

      {at, strlen} ->

        String.length(text) - at - strlen



      :nomatch ->

        nil

    end

  end

end