color annotate hexdumps

Thanks to the legend @Learath2

lib/bytes.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative 'array'
+require_relative 'string'
 
 # turn byte array into hex string
 def str_hex(data)
@@ -15,17 +16,61 @@ def data_to_ascii(data)
   ascii
 end
 
-def hexdump_lines(data, width = 2)
+def hexdump_lines(data, width = 2, notes = [], opts = {})
   byte_groups = data.unpack1('H*').scan(/../).groups_of(4)
   lines = []
   hex = ''
   ascii = ''
   w = 0
+  byte = 0
+  legend = []
+  notes.each do |info|
+    color = info.first
+    raise "Invalid color '#{color}' valid ones: #{AVAILABLE_COLORS}" unless AVAILABLE_COLORS.include? color
+
+    legend.push([color, info.last.send(color)])
+  end
+  unless legend.empty?
+    if opts[:long_legend]
+      legend.each do |leg|
+        lines.push("#{leg.first}: #{leg.last}".send(leg.first))
+      end
+    else
+      lines.push(legend.map(&:last).join(' '))
+    end
+  end
   byte_groups.each do |byte_group|
     hex += '  ' unless hex.empty?
-    hex += byte_group.join(' ')
     ascii += data_to_ascii(str_bytes(byte_group.join).pack('C*'))
     w += 1
+    notes.each do |info|
+      color = info.first
+      # p color
+      # p info
+      from = info[1]
+      to = info[1] + (info[2] - 1)
+
+      if from > byte + 3
+        # puts "a"
+        next
+      end
+      if to < byte
+        # puts "to: #{to} < byte: #{byte}"
+        next
+      end
+
+      from -= byte
+      to -= byte
+      from = 0 if from.negative?
+      to = 3 if to > 3
+
+      # puts "from: #{from} to: #{to}"
+      (from..to).each do |i|
+        byte_group[i] = byte_group[i].send(color)
+      end
+    end
+    byte += 4
+    hex += byte_group.join(' ')
     next unless w >= width
 
     w = 0
@@ -50,3 +95,22 @@ end
 def get_byte(data, start = 0, num = 1)
   data[start...(start + num)].unpack('H*').join.upcase
 end
+
+def todo_make_this_a_unit_test
+  notes = [
+    [:red, 0, 1, 'foo'],
+    [:green, 1, 1, 'bar'],
+    [:yellow, 2, 1, 'baz'],
+    [:pink, 3, 1, 'bang'],
+    [:green, 4, 1, 'bär'],
+    [:yellow, 6, 6, 'yee']
+  ]
+
+  hexdump_lines("\x01\x41\x02\x03\x03\x03\x03\x03\x03\x03\x03\x03\x03\xef", 40, notes).each do |l|
+    puts l
+  end
+
+  hexdump_lines("\x01\x41\x02\x03\x03\x03\x03\x03\x03\x03\x03\x03\x03\xef", 40, notes, long_legend: true).each do |l|
+    puts l
+  end
+end

lib/game_client.rb

@@ -182,7 +182,10 @@ class GameClient
     # TODO: add get_raw(size)
     data = u.get_raw
     puts 'snap:'
-    hexdump_lines(data.pack('C*')).each do |hex|
+    notes = [
+      [:green, 0, 4, 'who dis?']
+    ]
+    hexdump_lines(data.pack('C*'), 2, notes, long_legend: true).each do |hex|
       puts hex
     end
 

lib/string.rb

@@ -1,5 +1,9 @@
 # frozen_string_literal: true
 
+AVAILABLE_COLORS = %i[
+  red green yellow pink
+].freeze
+
 # String color
 class String
   def colorize(color_code)