diff mercurial/debugcommands.py @ 44463:295417387769

debuginstall: print if Rust extensions are installed

This should make it easier to use the Rust extensions.

Another patch on will be exposing a version and more useful information, but
it can only be done on top of this very patch, since it is targeting the stable
branch and the API has already changed on the default branch.

Differential Revision: https://phab.mercurial-scm.org/D8248

--- a/mercurial/debugcommands.py	Fri Mar 06 13:54:35 2020 -0500
+++ b/mercurial/debugcommands.py	Fri Mar 06 12:44:51 2020 +0100
@@ -1508,6 +1508,13 @@
         pythonlib or _(b"unknown"),
     )
 
+    try:
+        from . import rustext
+
+        rustext.__doc__  # trigger lazy import
+    except ImportError:
+        rustext = None
+
     security = set(sslutil.supportedprotocols)
     if sslutil.hassni:
         security.add(b'sni')
@@ -1535,6 +1542,13 @@
             )
         )
 
+    fm.plain(
+        _(
+            b"checking Rust extensions (%s)\n"
+            % (b'missing' if rustext is None else b'installed')
+        ),
+    )
+
     # TODO print CA cert info
 
     # hg version