Specify multiple attributes on one line

src/parser.rs

@@ -854,19 +854,25 @@ impl<'tokens, 'src> Parser<'tokens, 'src> {
     let mut attributes = BTreeMap::new();
 
     while self.accepted(BracketL)? {
-      let name = self.parse_name()?;
-      let attribute = Attribute::from_name(name).ok_or_else(|| {
-        name.error(CompileErrorKind::UnknownAttribute {
-          attribute: name.lexeme(),
-        })
-      })?;
-      if let Some(line) = attributes.get(&attribute) {
-        return Err(name.error(CompileErrorKind::DuplicateAttribute {
-          attribute: name.lexeme(),
-          first: *line,
-        }));
+      loop {
+        let name = self.parse_name()?;
+        let attribute = Attribute::from_name(name).ok_or_else(|| {
+          name.error(CompileErrorKind::UnknownAttribute {
+            attribute: name.lexeme(),
+          })
+        })?;
+        if let Some(line) = attributes.get(&attribute) {
+          return Err(name.error(CompileErrorKind::DuplicateAttribute {
+            attribute: name.lexeme(),
+            first: *line,
+          }));
+        }
+        attributes.insert(attribute, name.line);
+
+        if !self.accepted(TokenKind::Comma)? {
+          break;
+        }
       }
-      attributes.insert(attribute, name.line);
       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();
+}