mirror of
https://github.com/lune-org/docs.git
synced 2024-12-12 13:00:37 +00:00
35 lines
1.1 KiB
Markdown
35 lines
1.1 KiB
Markdown
# Environment Variables
|
|
|
|
Environment variables, just like script arguments, are available using the
|
|
[process](../../api-reference/process.md) built-in library, more specifically in
|
|
[`process.env`](../../api-reference/process.md#env):
|
|
|
|
```lua copy
|
|
local process = require("@lune/process")
|
|
|
|
assert(process.env.PATH ~= nil, "Missing PATH")
|
|
assert(process.env.PWD ~= nil, "Missing PWD")
|
|
|
|
process.env.MY_VAR = "Hello, env!"
|
|
|
|
print(process.env.MY_VAR)
|
|
--> Hello, env!
|
|
```
|
|
|
|
Unlike [`process.args`](../../api-reference/process.md#args), environment variables can be read from
|
|
and written to freely, and can be done at any point during runtime.
|
|
|
|
You can also iterate over all of the known environment variables using Luau's generalized iteration.
|
|
Here is an example snippet that prints a checkmark if an environment variable has some contents and
|
|
is not empty, and a red cross otherwise:
|
|
|
|
```lua copy
|
|
local process = require("@lune/process")
|
|
|
|
for key, value in process.env do
|
|
local box = if value ~= "" then "✅" else "❌"
|
|
print(string.format("[%s] %s", box, key))
|
|
end
|
|
```
|
|
|
|
Note that using `pairs` or `ipairs` will _not_ work here, only generalized iteration.
|