initial version

Gemfile

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+source 'https://rubygems.org'
+gem 'zip'
+gem 'css_parser'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    css_parser (1.6.0)
+      addressable
+    public_suffix (3.0.0)
+    zip (2.0.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  css_parser
+  zip
+
+BUNDLED WITH
+   1.10.6

README.md

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+Script to fix epub where the line spacings are set to a fixed value.

src/epub-spacing-fixer.rb

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+#!/usr/bin/env ruby
+
+require "rubygems"
+require 'getoptlong'
+require "zip/zip"
+require "css_parser"
+require "fileutils"
+
+def open_zip(zip_file_name, nowrite=false)
+	Zip::ZipFile.open(zip_file_name) do |zipfile|
+		files = zipfile.select(&:file?)
+		files.each do |zip_entry|
+			#puts zip_entry.name
+			contents = zipfile.read(zip_entry.name)
+			css = ""
+			if zip_entry.name.match(/\.css$/)
+				# modify css here
+				contents = fix_css(contents)
+				# write back css file
+				zipfile.get_output_stream(zip_entry.name){ |f| f.puts contents } unless nowrite
+			else
+				# write back non-css file
+				zipfile.get_output_stream(zip_entry.name){ |f| f.puts contents } unless nowrite
+			end
+		end
+		zipfile.commit unless nowrite
+	end
+end
+
+def fix_css(contents)
+	parser = CssParser::Parser.new
+	parser.load_string!(contents)
+
+	parser.each_rule_set{ |rule_set|
+		rule_set.each_declaration{ |decl|
+			if decl.match(/line-height/)
+				rule_set.remove_declaration!(decl)
+			end
+		}
+		if rule_set.selectors == ["body"]
+			rule_set.add_declaration!("line-height", "1.2")
+		elsif rule_set.selectors == ["body *"]
+			rule_set.add_declaration!("line-height", "inherit")
+		end
+	}
+
+	# If there is no 'body' selector, add one
+	if parser.find_by_selector('body').length == 0
+		css = <<-EOT.gsub(/^\t*/, '')
+		body {
+		  line-height: 1.2;
+		}
+		EOT
+		parser.add_block!(css)
+	end
+	# If there is no 'body *' selector, add one
+	if parser.find_by_selector('body *').length == 0
+		css = <<-EOT.gsub(/^\t*/, '')
+		body * {
+		  line-height: inherit;
+		}
+		EOT
+		parser.add_block!(css)
+	end
+	return parser.to_s
+end
+
+def usage
+	puts <<EOT
+Tool to change epub css to fix common annoyances.
+
+Usage: #{$0.sub(/.*\//, "")} [options] <file>
+
+-h, --help			show this message
+-n				do nothing
+-o <file>			output to file
+EOT
+	exit
+end
+
+def cmdline
+	options = Hash.new
+	begin
+		opts = GetoptLong.new(
+			[ "-h", "--help",		GetoptLong::NO_ARGUMENT ],
+			[ "-n",				GetoptLong::NO_ARGUMENT ],
+			[ "-o",				GetoptLong::REQUIRED_ARGUMENT ]
+		)
+		opts.quiet=true
+
+		opts.each do |opt, arg|
+			options[opt] = arg
+		end
+
+	rescue
+		print "#{$!}\n"
+		usage
+	end
+	if options["-h"]
+		usage
+	end
+	return options
+end
+
+options = cmdline
+infile = ARGV[0]
+
+if options["-o"]
+	FileUtils.cp(infile, options["-o"])
+	infile = options["-o"]
+end
+
+open_zip(infile, options["-n"])
+
+
+# the following seems to be completely evil in css:
+# display: block