Render different frontmatter for different editions

1 files changed, 55 insertions, 0 deletions

diff --git a/script/erbber.rb b/script/erbber.rb
new file mode 100644
index 0000000..bb79095
--- /dev/null
+++ b/script/erbber.rb
@@ -0,0 +1,55 @@
+#!/usr/bin/env ruby
+#
+# WilloraPDF template renderer
+# Charlotte Koch <dressupgeekout@gmail.com>
+#
+
+require 'erb'
+require 'optparse'
+
+input = nil
+defines = {}
+
+# Parse command line options.
+parser = OptionParser.new do |opts|
+  opts.on("-i", "--input FILE") { |path| input = File.expand_path(path) }
+  opts.on("-D", "--define KEY=VALUE") { |arg| d = arg.split("="); defines[d[0]] = d[1]; }
+end
+parser.parse!(ARGV)
+
+# Validate the command line options.
+if not File.file?(input)
+  $stderr.puts("FATAL: no such file: #{input}")
+  exit 1
+end
+
+defines.each do |k, v|
+  if v && !k
+    $stderr.puts("pair is missing a key: #{[k,v].inspect}")
+    exit 1
+  end
+
+  if k && !v
+    $stderr.puts("pair is missing a value: #{[k,v].inspect}")
+    exit 1
+  end
+end
+
+# Set up the variable binding sandbox which will be given to the template.
+class OurEnvironment
+  attr_reader :var
+
+  def initialize(data)
+    @var = data
+  end
+
+  def get_binding
+    return binding
+  end
+end
+
+our_env = OurEnvironment.new(defines)
+
+# Render the template to standard output.
+result = ERB.new(File.read(input)).result(our_env.get_binding)
+$stdout.puts(result)