Allow multiple attributes on one line (#1537)

src/parser.rs

@@ -854,6 +854,7 @@ impl<'tokens, 'src> Parser<'tokens, 'src> {
     let mut attributes = BTreeMap::new();
 
     while self.accepted(BracketL)? {
+      loop {
         let name = self.parse_name()?;
         let attribute = Attribute::from_name(name).ok_or_else(|| {
           name.error(CompileErrorKind::UnknownAttribute {
@@ -867,6 +868,11 @@ impl<'tokens, 'src> Parser<'tokens, 'src> {
           }));
         }
         attributes.insert(attribute, name.line);
+
+        if !self.accepted(TokenKind::Comma)? {
+          break;
+        }
+      }
       self.expect(BracketR)?;
       self.expect_eol()?;
     }

tests/attributes.rs

@@ -41,3 +41,65 @@ fn duplicate_attributes_are_disallowed() {
     .status(1)
     .run();
 }
+
+#[test]
+fn multiple_attributes_one_line() {
+  Test::new()
+    .justfile(
+      "
+      [macos, windows,linux]
+      [no-exit-message]
+      foo:
+        exit 1
+    ",
+    )
+    .stderr("exit 1\n")
+    .status(1)
+    .run();
+}
+
+#[test]
+fn multiple_attributes_one_line_error_message() {
+  Test::new()
+    .justfile(
+      "
+      [macos, windows linux]
+      [no-exit-message]
+      foo:
+        exit 1
+    ",
+    )
+    .stderr(
+      "
+        error: Expected ']' or ',', but found identifier
+          |
+        1 | [macos, windows linux]
+          |                 ^^^^^
+          ",
+    )
+    .status(1)
+    .run();
+}
+
+#[test]
+fn multiple_attributes_one_line_duplicate_check() {
+  Test::new()
+    .justfile(
+      "
+      [macos, windows, linux]
+      [linux]
+      foo:
+        exit 1
+    ",
+    )
+    .stderr(
+      "
+      error: Recipe attribute `linux` first used on line 1 is duplicated on line 2
+        |
+      2 | [linux]
+        |  ^^^^^
+        ",
+    )
+    .status(1)
+    .run();
+}