From 5bc7b704f53130aa9c06f1d664f32940f7312956 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Thu, 31 Oct 2024 22:24:09 -0400
Subject: [PATCH] src/sage/features/info.py: new feature for GNU Info

Before we can replace our hand-rolled parser for Singular's info file,
we need to be able to detect the "info" program from the GNU Info
package. The goal is to politely disable access to Singular's info if
GNU Info is unavailable. This avoids a hard dependency on GNU Info in
the sage library.
---
 src/sage/features/info.py | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 src/sage/features/info.py

diff --git a/src/sage/features/info.py b/src/sage/features/info.py
new file mode 100644
index 00000000000..fd3ad17e22a
--- /dev/null
+++ b/src/sage/features/info.py
@@ -0,0 +1,31 @@
+# sage_setup: distribution = sagemath-environment
+r"""
+Feature for testing the presence of ``info``, from GNU Info
+"""
+
+from . import Executable
+
+class Info(Executable):
+    r"""
+    A :class:`~sage.features.Feature` describing the presence of :ref:`info <spkg_info>`.
+
+    EXAMPLES::
+
+        sage: from sage.features.info import Info
+        sage: Info().is_present()  # needs info
+        FeatureTestResult('info', True)
+
+    """
+    def __init__(self):
+        r"""
+        TESTS::
+
+            sage: from sage.features.info import Info
+            sage: isinstance(Info(), Info)
+            True
+        """
+        Executable.__init__(self, 'info', executable='info',
+                            spkg='info', type='standard')
+
+def all_features():
+    return [Info()]