commit cdf01a39ab9def4d46f41595ac1ac9206a96d6f8
author Fabian Meumertzheim <fabian@meumertzhe.im> Wed Jul 20 08:22:48 2022 -0700
committer Copybara-Service <copybara-worker@google.com> Wed Jul 20 08:24:02 2022 -0700
tree 5fcd7e3e58cf5c48c119962db589711a3a9cb101
parent dcd85855a75789a4d7dc47254bf9163248598303

Allow string_list flags to be set via repeated flag uses

For all parts of Bazel other than option parsing, string build setting
flags with `allow_multiple = True` should behave just like `string_list`
settings, even though they are fundamentally of a different type. This
requires a lot of special casing all over the code base and also causes
confusing user-facing behavior when transitioning on such settings.

This commit deprecates the `allow_multiple` named parameter of
`config.string` and as a replacement introduces a new named parameter
`repeatable` on `config.string_list`. Settings with the latter set to True
behave exactly like `string` settings with `allow_multiple = True` with
respect to command-line option parsing and exactly like ordinary
`string_list` flags in all other situations.

Fixes #13817

Closes #14911.

PiperOrigin-RevId: 462146752
Change-Id: I91ddc4328a1b2244f4303fcda7b4228b182a5d56

src/test/java/com/google/devtools/build/lib/starlark/StarlarkOptionsParsingTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/starlark/StarlarkOptionsParsingTest.java b/src/test/java/com/google/devtools/build/lib/starlark/StarlarkOptionsParsingTest.java
index 0e93717..6579eec 100644
--- a/src/test/java/com/google/devtools/build/lib/starlark/StarlarkOptionsParsingTest.java
+++ b/src/test/java/com/google/devtools/build/lib/starlark/StarlarkOptionsParsingTest.java
@@ -478,4 +478,27 @@
     assertThat((List<String>) result.getStarlarkOptions().get("//test:cats"))
         .containsExactly("calico", "bengal");
   }
+
+  @Test
+  @SuppressWarnings("unchecked")
+  public void testRepeatedStringListFlag() throws Exception {
+    scratch.file(
+        "test/build_setting.bzl",
+        "def _build_setting_impl(ctx):",
+        "  return []",
+        "repeated_flag = rule(",
+        "  implementation = _build_setting_impl,",
+        "  build_setting = config.string_list(flag=True, repeatable=True)",
+        ")");
+    scratch.file(
+        "test/BUILD",
+        "load('//test:build_setting.bzl', 'repeated_flag')",
+        "repeated_flag(name = 'cats', build_setting_default = ['tabby'])");
+
+    OptionsParsingResult result = parseStarlarkOptions("--//test:cats=calico --//test:cats=bengal");
+
+    assertThat(result.getStarlarkOptions().keySet()).containsExactly("//test:cats");
+    assertThat((List<String>) result.getStarlarkOptions().get("//test:cats"))
+        .containsExactly("calico", "bengal");
+  }
 }