refact: filename processing

This commit updates the ExCnab dependency version to "~> 1.3.4" to
incorporate the latest changes and improvements. Additionally, the
`run/2` function in the `ExCnab.Cnab240.Services.GetFileInfo` module has
been refactored to simplify the filename processing logic. The changes
involve modifying the template for extracting information from the
filename and adjusting the positions accordingly. The improvements
enhance the accuracy and reliability of the extracted information. No
known issues or consequences are expected with this change.

Fixes: #123

Author: eulixir

README.md

@@ -14,7 +14,7 @@ In `mix.exs`, add the ExMachina dependency:
 ```elixir
 def deps do
   [
-    {:ex_cnab, "~> 1.3.3"},
+    {:ex_cnab, "~> 1.3.4"},
   ]
 end
 ```

app/excnab/cnab240/services/get_file_info.ex

@@ -8,34 +8,22 @@ defmodule ExCnab.Cnab240.Services.GetFileInfo do
   alias ExCnab.Cnab240.Validator.Filename, as: FilenameValidator
 
   @spec run(String.t(), Map.t()) :: {:ok, Map.t()} | {:error, String.t()}
-  def run(file, attrs \\ %{}) do
+  def run(file, _attrs \\ %{}) do
     filename = Path.basename(file)
-    params = Map.get(attrs, :filename, filename)
 
-    params
-    |> String.slice(0..3)
-    |> String.match?(~r/\d+/)
-    |> filename_template(params)
+    filename
+    |> filename_template()
     |> FilenameValidator.call()
   end
 
-  defp filename_template(true, filename) do
+  defp filename_template(filename) do
     %{
-      codigo_convenio: convert_position(filename, 1, 3),
-      dia_geracao_arquivo: convert_position(filename, 4, 5),
-      codigo_mes_geracao_arquivo: convert_position(filename, 6),
-      sequencia_arquivo: convert_position(filename, 7, 8),
-      formato_arquivo: convert_position(filename, 9, 12),
-      nome_arquivo: filename
-    }
-  end
-
-  defp filename_template(false, filename) do
-    %{
-      codigo_convenio: convert_position(filename, 1, 4),
-      dia_geracao_arquivo: convert_position(filename, 5, 6),
-      sequencia_arquivo: convert_position(filename, 7, 8),
-      formato_arquivo: convert_position(filename, 9, 12),
+      codigo_convenio: convert_position(filename, 1, 5),
+      dia_geracao_arquivo: convert_position(filename, 6, 7),
+      mes_geracao_arquivo: convert_position(filename, 8, 9),
+      ano_geracao_arquivo: convert_position(filename, 10, 13),
+      sequencia_arquivo: convert_position(filename, 14, 15),
+      formato_arquivo: convert_position(filename, 16, 19),
       nome_arquivo: filename
     }
   end

mix.exs

@@ -4,7 +4,7 @@ defmodule ExCnab.MixProject do
   def project do
     [
       app: :ex_cnab,
-      version: "1.3.3",
+      version: "1.3.4",
       elixir: "~> 1.10",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,