added file structure. First specs pass

spec/nacha/file_header_spec.cr

@@ -0,0 +1,23 @@
+require "../spec_helper"
+
+describe Nacha::FileHeader do
+  describe "build" do
+    it "formats the data correctly" do
+      example = "101 021406766 8723856712212071417A094101Bank of Specialty      JSTV Enterprises               "
+
+      current_time = Time.utc(2022, 12, 7, 14, 17, 0)
+
+      io = IO::Memory.new
+      file_header = Nacha::FileHeader.new(
+        immediate_destination: "021406766",
+        immediate_origin: "872385671",
+        immediate_destination_name: "Bank of Specialty",
+        immediate_origin_name: "JSTV Enterprises",
+        file_creation_date: current_time,
+        file_creation_time: current_time,
+      )
+      file_header.build(io)
+      io.to_s.should eq(example)
+    end
+  end
+end

spec/nacha_spec.cr

@@ -1,9 +1,5 @@
 require "./spec_helper"
 
 describe Nacha do
-  # TODO: Write tests
 
-  it "works" do
-    false.should eq(true)
-  end
 end

src/nacha.cr

@@ -1,3 +1,4 @@
+require "./nacha/mixins/*"
 require "./nacha/**"
 
 module Nacha

src/nacha/batch_control.cr

@@ -1,5 +1,7 @@
 module Nacha
   class BatchControl
+    TYPE_CODE = 8
+
     def initialize
     end
   end

src/nacha/batch_header.cr

@@ -1,5 +1,7 @@
 module Nacha
   class BatchHeader
+    TYPE_CODE = 5
+
     def initialize
     end
   end

src/nacha/entry_detail.cr

@@ -1,5 +1,7 @@
 module Nacha
   class EntryDetail
+    TYPE_CODE = 6
+
     def initialize
     end
   end

src/nacha/entry_detail_addenda.cr

@@ -0,0 +1,8 @@
+module Nacha
+  class EntryDetailAddenda
+    TYPE_CODE = 7
+
+    def initialize
+    end
+  end
+end

src/nacha/file_control.cr

@@ -1,5 +1,7 @@
 module Nacha
   class FileControl
+    TYPE_CODE = 9
+
     def initialize
     end
   end

src/nacha/file_header.cr

@@ -1,6 +1,43 @@
 module Nacha
+  # This record includes your company name and
+  # company number. It also designates the immediate destination (LaSalle Bank
+  # N.A. or Standard Federal Bank) of the entries contained within the file.
   class FileHeader
-    def initialize
+    include BuildableRecord
+
+    TYPE_CODE = 1 # Identifies this is the FileHeader
+    PRIORITY_CODE = 1 # lower number is higher priority (but only 01 is used)
+
+    def initialize(
+      @immediate_destination : String, # The Primary bank Routing number
+      @immediate_origin : String, # The Primary company EIN or ABN AMRO number
+      @immediate_destination_name : String, # The Primary bank name
+      @immediate_origin_name : String, # The Primary company's name
+      @file_creation_date : Time = Time.utc, # File creation date Formatted as YYMMDD
+      @file_creation_time : Time = Time.utc, # File creation time Formatted as HHMM
+      @file_id_modifier : Char = 'A', # Each file submitted in the same day must update this to the next consecutive letter, then 0-9
+      @record_size : Int32 = 94, # The number of bytes per record row
+      @blocking_factor : String = "10", # wat
+      @format_code : String = "1", # Placeholder for future other formats
+      @reference_code : String? = nil # Used for your own internal accounting
+    )
+    end
+
+    def build(io : IO) : IO
+      io << TYPE_CODE.to_s
+      io << PRIORITY_CODE.to_s.rjust(2, '0')
+      io << @immediate_destination.rjust(10, ' ')
+      io << @immediate_origin.rjust(10, ' ')
+      io << @file_creation_date.to_s("%y%m%d")
+      io << @file_creation_time.to_s("%H%M")
+      io << @file_id_modifier.to_s
+      io << @record_size.to_s.rjust(3, '0')
+      io << @blocking_factor
+      io << @format_code
+      io << @immediate_destination_name[0..22].ljust(23, ' ')
+      io << @immediate_origin_name[0..22].ljust(23, ' ')
+      io << @reference_code.to_s.ljust(8, ' ')
+      io
     end
   end
 end

src/nacha/mixins/buildable_record.cr

@@ -0,0 +1,4 @@
+module BuildableRecord
+  # This turns the record in to it's data line
+  abstract def build(io : IO) : IO
+end