Rakefile: add notes target

hardware/Rakefile

@@ -7,6 +7,7 @@ uses Lepton EDA for schematic and pcb-rnd for board layouts.
 Rakefile instead of Makefile for better text file parsing capabilities.
 =end
 require 'rake/clean'
+require 'csv' # to export BOM and costs
 
 # =================
 # project variables
@@ -90,6 +91,11 @@ net = [ "#{name}.tdx" ]
 task :netlist => net
 CLOBBER.include(net)
 
+desc "export notes from schematic"
+notes = [ "#{name}.notes.txt" ]
+task :notes => notes
+CLOBBER.include(notes)
+
 # ===============
 # file generation
 # ===============
@@ -134,3 +140,49 @@ rule ".tdx" => ".sch" do |t|
   sh "lepton-netlist -g tEDAx -o #{t.name} #{t.source} 2> /dev/null"
 end
 
+desc "generate note file from schematic, listing the 'note' attributes from elements"
+rule ".notes.txt" => ".sch" do |t|
+  notes_data = bom2(t.prerequisites[0], ["note", "value"])
+  File.open(t.name,"w") do |notes_file|
+    notes_data.each do |note|
+      next unless note['note']
+      note['note'] = note['note'].gsub('. ',".\n").gsub(/\n+$/,'')
+      notes_file.puts "#{note['value']} (#{note['refdes']}):\n#{note['note']}\n\n"
+    end
+  end
+end
+
+# ================
+# helper functions
+# ================
+
+# generate gnetlist bom2 and parse them
+# arguments: schematic=schematic to use, attributes=attributes to use for generating bom2
+# returns an array of hash. key is the attribute name, value is the attribute value
+def bom2(schematic, attributes)
+  to_return = []
+  # force attributes to be an array
+  attributes = case attributes
+  when String
+   [attributes]
+  when Array
+    attributes
+  else
+    [attributes.to_s]
+  end
+  # generate bom2
+  list = `lepton-netlist --backend bom2 --backend-option attribs=#{attributes*','} --quiet --output - #{schematic} 2> /dev/null`
+  list.gsub!(/(\d[Mkmµ]?)\?/, '\1Ω') # UTF-8 characters like Ω are replaced with ? by gnetlist
+  list.gsub!(/(https?:\/\/[^:]*):/, '"\1":') # ':' (like in links) are not protected
+  # parse bom2
+  csv = CSV.parse(list,{:col_sep => ":"})
+  csv[1..-1].each do |row|
+    line = {}
+    row.each_index do |col|
+      line[csv[0][col]] = row[col] unless row[col] == "unknown"
+    end
+    to_return << line
+  end
+  return to_return
+end
+