Allow printing UserOptions in the summary

docs/markdown/Reference-manual.md

@@ -1356,6 +1356,7 @@ dictionaries does not guarantee ordering. `key` must be string,
 
 - an integer, boolean or string
 - *since 0.57.0* an external program or a dependency
+- *since 0.58.0* a feature option
 - a list of those.
 
 `summary()` can be called multiple times as long as the same

docs/markdown/snippets/summary-accepts-features.md

@@ -0,0 +1,3 @@
+## `summary()` accepts features
+
+Build feature options can be passed to `summary()` as the value to be printed.

mesonbuild/interpreter.py

@@ -1878,6 +1878,9 @@ class Summary:
                 elif isinstance(i, (ExternalProgram, Dependency)):
                     FeatureNew.single_use('dependency or external program in summary', '0.57.0', subproject)
                     formatted_values.append(i.summary_value())
+                elif isinstance(i, coredata.UserOption):
+                    FeatureNew.single_use('feature option in summary', '0.58.0', subproject)
+                    formatted_values.append(i.printable_value())
                 else:
                     m = 'Summary value in section {!r}, key {!r}, must be string, integer, boolean, dependency or external program'
                     raise InterpreterException(m.format(section, k))

run_unittests.py

@@ -4996,6 +4996,7 @@ class AllPlatformTests(BasePlatformTests):
                                  1
                                  True
                 empty list     :
+                enabled_opt    : enabled
                 A number       : 1
                 yes            : YES
                 no             : NO

test cases/unit/73 summary/meson.build

@@ -8,6 +8,7 @@ summary({'Some boolean': false,
          'Some string': 'Hello World',
          'A list': ['string', 1, true],
          'empty list': [],
+         'enabled_opt': get_option('enabled_opt'),
         }, section: 'Configuration')
 summary({'missing prog': find_program('xyzzy', required: false),
          'existing prog': import('python').find_installation(),

test cases/unit/73 summary/meson_options.txt

@@ -0,0 +1 @@
+option('enabled_opt', type: 'feature', value: 'enabled')