docs/pages/api-reference/process.md

Process

Built-in functions for the current process & child processes

Example usage

local process = require("@lune/process")

-- Getting the arguments passed to the Lune script
for index, arg in process.args do
	print("Process argument #" .. tostring(index) .. ": " .. arg)
end

-- Getting the currently available environment variables
local PORT: string? = process.env.PORT
local HOME: string? = process.env.HOME
for name, value in process.env do
	print("Environment variable " .. name .. " is set to " .. value)
end

-- Getting the current os and processor architecture
print("Running " .. process.os .. " on " .. process.arch .. "!")

-- Spawning a child process
local result = process.spawn("program", {
	"cli argument",
	"other cli argument"
})
if result.ok then
	print(result.stdout)
else
	print(result.stderr)
end

Properties

os

OS

The current operating system being used.

Possible values:

• "linux"
• "macos"
• "windows"

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arch

Arch

The architecture of the processor currently being used.

Possible values:

• "x86_64"
• "aarch64"

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args

{ string }

The arguments given when running the Lune script.

---

cwd

string

The current working directory in which the Lune script is running.

---

env

{ [string]: string? }

Current environment variables for this process.

Setting a value on this table will set the corresponding environment variable.

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Functions

exit

Exits the currently running script as soon as possible with the given exit code.

Exit code 0 is treated as a successful exit, any other value is treated as an error.

Setting the exit code using this function will override any otherwise automatic exit code.

Parameters

• code The exit code to set

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spawn

Spawns a child process that will run the program program, and returns a dictionary that describes the final status and ouput of the child process.

The second argument, params, can be passed as a list of string parameters to give to the program.

The third argument, options, can be passed as a dictionary of options to give to the child process. Refer to the documentation for SpawnOptions for specific option keys and their values.

Parameters

• program The program to spawn as a child process

• params Additional parameters to pass to the program

• options A dictionary of options for the child process

Returns

• A dictionary representing the result of the child process

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Types

SpawnOptions

A dictionary of options for process.spawn, with the following available values:

• cwd - The current working directory for the process
• env - Extra environment variables to give to the process
• shell - Whether to run in a shell or not - set to true to run using the default shell, or a string to run using a specific shell
• stdio - How to treat output and error streams from the child process - set to "inherit" to pass output and error streams to the current process

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SpawnResult

Result type for child processes in process.spawn.

This is a dictionary containing the following values:

• ok - If the child process exited successfully or not, meaning the exit code was zero or not set
• code - The exit code set by the child process, or 0 if one was not set
• stdout - The full contents written to stdout by the child process, or an empty string if nothing was written
• stderr - The full contents written to stderr by the child process, or an empty string if nothing was written

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