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alice is a C++-14 command shell library that supports automatic Python bindings. It offers a simple yet feature-rich embedded DSL to create shell interfaces with user-defined commands that access and manipulate arbitrary user-defined data types. Here is a small example for a shell to manipulate `string` objects.
#include<alice/alice.hpp>
#include<algorithm>
#include<iostream>
#include<string>namespacealice
{
ALICE_ADD_STORE(std::string, "str", "s", "String", "Strings")
ALICE_PRINT_STORE(std::string, os, element)
{
os << element << std::endl;
}
ALICE_COMMAND(hello, "Generation", "adds a welcome string to the store")
{
auto& strings = store<std::string>();
strings.extend() = "hello world";
}
ALICE_COMMAND(upper, "Manipulation", "changes string to upper bound")
{
auto& str = store<std::string>().current();
std::transform( str.begin(), str.end(), str.begin(), ::toupper );
}
}
ALICE_MAIN(demo)
After compiling we obtain a shell program with commands that allow us to do the following:
demo> hello
demo> print -s
hello world
demo> hello
demo> upper
demo> print -s
HELLO WORLD
demo> current -s 0
demo> print -s
hello world
demo> quit
We can use the very same code to compile it into a Python library instead of an executable, allowing us to call the commands as Python methods. For example:
