kmckelvin · November 11, 2012 17:21 · Nov 11, 2012 · Nov 11, 2012 · Nov 11, 2012 · Nov 11, 2012
diff --git a/README.md b/README.md
@@ -1,9 +1,9 @@
 ## Usage
 
-Pretty easy to use:
+Pretty easy to use - just make sure that Ruby is installed, then run this:
 
 ```
-opensong_to_onsong.rb ./path_to_opensong_file.xml > ./export_filename.txt
+ruby opensong_to_onsong.rb ./path_to_opensong_file.xml > ./export_filename.txt
 ```
 
 It just outputs straight to STDIO.

diff --git a/opensong_to_onsong.rb b/opensong_to_onsong.rb
@@ -50,8 +50,6 @@ def to_lines(content)
   lines
 end
 
-p to_lines(content)
-
 def get_chord_positions(chord_line)
   positions = []
 

diff --git a/opensong_to_onsong.rb b/opensong_to_onsong.rb
@@ -16,6 +16,7 @@ def to_lines(content)
   file_lines.each do |line|
     if pair.any?
       pair << line[1..-1]
+      pair[1] ||= ""
       lines << pair
       pair = []
     elsif line[0] == '.' && pair.empty?
@@ -49,6 +50,8 @@ def to_lines(content)
   lines
 end
 
+p to_lines(content)
+
 def get_chord_positions(chord_line)
   positions = []
 
@@ -82,11 +85,14 @@ def interpolate_line(chord_positions, lyrics)
 
   chord_positions.each do |chord, position|
     insert_string = "[#{chord}]"
+    if output.length < (position + offset)
+      output << (" " * (position + offset - output.length))
+    end
     output.insert(position + offset, insert_string)
     offset += insert_string.length
   end
 
-  output
+  output.strip
 end
 
 lines = to_lines(content)
@@ -99,4 +105,3 @@ def interpolate_line(chord_positions, lyrics)
 onsong.each do |line|
   puts line
 end
-
diff --git a/README.md b/README.md
@@ -2,7 +2,9 @@
 
 Pretty easy to use:
 
+```
 opensong_to_onsong.rb ./path_to_opensong_file.xml > ./export_filename.txt
+```
 
 It just outputs straight to STDIO.
 

diff --git a/README.md b/README.md
@@ -0,0 +1,11 @@
+## Usage
+
+Pretty easy to use:
+
+opensong_to_onsong.rb ./path_to_opensong_file.xml > ./export_filename.txt
+
+It just outputs straight to STDIO.
+
+## Disclaimer
+
+I just put this together pretty quickly, and by no means intended to cover the entire OpenSong spec.  In my trials it seems to work pretty accurately.  If there are issues - drop me a message and I'll look into them :)
diff --git a/opensong_to_onsong.rb b/opensong_to_onsong.rb
@@ -0,0 +1,102 @@
+require 'nokogiri'
+
+file = ARGV[0]
+
+xml = Nokogiri::XML(File.read(file))
+
+title = xml.css('title').text
+content = xml.css('lyrics').text
+
+def to_lines(content)
+  file_lines = content.split("\n")
+  lines = []
+
+  pair = []
+
+  file_lines.each do |line|
+    if pair.any?
+      pair << line[1..-1]
+      lines << pair
+      pair = []
+    elsif line[0] == '.' && pair.empty?
+      pair = [line[1..-1]]
+    elsif line[0] == ' ' && pair.empty?
+      pair = []
+      lines << ["", line]
+    elsif line =~ /\[V(\d*)\]/
+      pair = []
+      lines << ["", "Verse #{$1}:"]
+    elsif line =~ /\[C(\d*)\]/
+      pair = []
+      number = $1.length != 0 ? " #{$1}" : ""
+      lines << ["", "Chorus#{number}:"]
+    elsif line =~ /\[PC(\d*)\]/
+      pair = []
+      number = $1.length != 0 ? " #{$1}" : ""
+      lines << ["", "Prechorus#{number}:"]
+    elsif line =~ /\[B(\d*)\]/
+      pair = []
+      number = $1.length != 0 ? " #{$1}" : ""
+      lines << ["", "Bridge#{number}:"]
+    elsif line.strip == ""
+      pair = []
+      lines << ["", ""]
+    else
+      pair = []
+    end
+  end
+
+  lines
+end
+
+def get_chord_positions(chord_line)
+  positions = []
+
+  chord = ""
+  start_pos = 0
+
+  (0..chord_line.length - 1).each do |i|
+    if chord_line[i] == ' ' && chord != ""
+      positions << [chord, start_pos]
+      chord = ""
+      start_pos = 0
+    end
+
+    if chord_line[i] != ' '
+      start_pos = i if chord == ""
+      chord << chord_line[i]
+    end
+  end
+
+  if chord != ""
+    positions << [chord, start_pos]
+  end
+
+  positions
+end
+
+def interpolate_line(chord_positions, lyrics)
+  output = lyrics.dup
+
+  offset = 0
+
+  chord_positions.each do |chord, position|
+    insert_string = "[#{chord}]"
+    output.insert(position + offset, insert_string)
+    offset += insert_string.length
+  end
+
+  output
+end
+
+lines = to_lines(content)
+onsong = lines.map { |chords, lyrics| [get_chord_positions(chords), lyrics] }.map{ |chord_positions, lyrics| interpolate_line(chord_positions, lyrics) }
+
+key = get_chord_positions(lines.find { |chords, lyrics| chords.length != 0 }[0])[0][0] rescue nil
+
+puts title
+puts "Key: [#{key}]" if key
+onsong.each do |line|
+  puts line
+end
+
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