v1.2.0

Author: lpil

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v1.2.0 - 2025-07-02
+
+- The `gleam/erlang/process` module gains the `subject_name` function.
+
 ## v1.1.0 - 2025-06-25
 
 - The `gleam/erlang/atom` module gains the `to_dynamic` and `decoder` functions.

gleam.toml

@@ -1,6 +1,6 @@
 name = "gleam_erlang"
 
-version = "1.1.0"
+version = "1.2.0"
 licences = ["Apache-2.0"]
 description = "Types and functions for programs running on Erlang!"
 

src/gleam/erlang/process.gleam

@@ -133,6 +133,15 @@ pub fn named_subject(name: Name(message)) -> Subject(message) {
   NamedSubject(name)
 }
 
+/// Get the name of a subject, returning an error if it doesn't have one.
+///
+pub fn subject_name(subject: Subject(message)) -> Result(Name(message), Nil) {
+  case subject {
+    NamedSubject(name:) -> Ok(name)
+    Subject(..) -> Error(Nil)
+  }
+}
+
 /// Create a new `Subject` owned by the current process.
 ///
 pub fn new_subject() -> Subject(message) {

test/gleam/erlang/process_test.gleam

@@ -42,6 +42,13 @@ pub fn new_name_test() {
     |> set.size
 }
 
+pub fn subject_name_test() {
+  let name = process.new_name("name")
+  let subject = process.named_subject(name)
+  assert process.subject_name(subject) == Ok(name)
+  assert process.subject_name(process.new_subject()) == Error(Nil)
+}
+
 pub fn subject_owner_named_test() {
   let name = process.new_name("name")
   let subject = process.named_subject(name)