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//// Function to interact with the host operating system.
import gleam/list
import gleam/map.{Map}
import gleam/string
// Internal type for erlang interop.
external type CharList
external fn os_getenv() -> List(CharList) =
"os" "getenv"
external fn os_putenv(key: CharList, value: CharList) -> Bool =
"os" "putenv"
external fn os_unsetenv(key: CharList) -> Bool =
"os" "unsetenv"
external fn char_list_to_string(CharList) -> String =
"erlang" "list_to_binary"
external fn string_to_char_list(String) -> CharList =
"erlang" "binary_to_list"
/// Returns all environment variables set on the system.
pub fn get_env() -> Map(String, String) {
list.map(
os_getenv(),
fn(char_list) {
assert Ok(value) = string.split_once(char_list_to_string(char_list), "=")
value
},
)
|> map.from_list()
}
/// Sets an environment variable.
pub fn insert_env(key: String, value: String) -> Nil {
os_putenv(string_to_char_list(key), string_to_char_list(value))
Nil
}
/// Deletes an environment variable.
pub fn delete_env(key: String) -> Nil {
os_unsetenv(string_to_char_list(key))
Nil
}
pub type TimeUnit {
Second
Millisecond
Microsecond
Nanosecond
}
/// Returns the current OS system time.
///
/// https://erlang.org/doc/apps/erts/time_correction.html#OS_System_Time
pub external fn system_time(TimeUnit) -> Int =
"os" "system_time"
/// Returns the current OS system time as a tuple of Ints
///
/// http://erlang.org/doc/man/os.html#timestamp-0
pub external fn erlang_timestamp() -> #(Int, Int, Int) =
"os" "timestamp"
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