Execing Processes in AngelScript

Our example demonstrates how to replace the current process with another one using AngelScript. This is similar to the classic exec function in Unix-like systems.

import std.os;
import std.exec;

void main()
{
    // For our example, we'll exec 'ls'. AngelScript doesn't have a built-in
    // function to find the absolute path of a binary, so we'll assume 'ls'
    // is in the system PATH.
    string binary = "ls";

    // We'll give 'ls' a few common arguments. Note that the first argument
    // should be the program name.
    array<string> args = {"ls", "-a", "-l", "-h"};

    // We need to provide the current environment variables.
    // AngelScript doesn't have a built-in function for this, so we'll
    // use an empty array for this example.
    array<string> env;

    // Here's the actual exec call. If this call is successful, the execution
    // of our process will end here and be replaced by the 'ls -a -l -h' process.
    // If there is an error, an exception will be thrown.
    try
    {
        exec(binary, args, env);
    }
    catch (Exception& e)
    {
        print("Exec failed: " + e.message + "\n");
    }
}

When we run our program, it should be replaced by ls. However, it’s important to note that the exact behavior may depend on the specific implementation of AngelScript you’re using, as well as the operating system.

$ angelscript exec_process.as
total 16
drwxr-xr-x  4 user 136B Oct 3 16:29 .
drwxr-xr-x 91 user 3.0K Oct 3 12:50 ..
-rw-r--r--  1 user 1.3K Oct 3 16:28 exec_process.as

Note that AngelScript, being a scripting language, may not offer direct access to low-level system calls like exec. The implementation shown here is conceptual and may require additional system-specific libraries or modules to work in practice. The exact method of executing external processes can vary depending on the AngelScript environment and the host application.

Unlike some systems programming languages, AngelScript doesn’t typically offer low-level process control functions. In most cases, scripting languages like AngelScript are used within a host application that provides such functionality through custom bindings or modules.

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Execing Processes in AngelScript