Octostache is the variable substitution syntax for Octopus Deploy.
Octopus allows you to define variables, which can then be referenced from deployment steps and in scripts using the following syntax:
#{MyVariable}
This library contains the code for parsing and evaluating these variable expressions.
Usage is simple: install Octostache from NuGet.org, then create a VariableDictionary:
var variables = new VariableDictionary();
variables.Set("Server", "Web01");
variables.Set("Port", "10933");
variables.Set("Url", "http://#{Server | ToLower}:#{Port}");
var url = variables.Get("Url"); // http://web01:10933
var raw = variables.GetRaw("Url"); // http://#{Server | ToLower}:#{Port}
var eval = variables.Evaluate("#{Url}/foo"); // http://web01:10933/fooMore examples can be found in UsageFixture.