log nutils version in cli.run, choose

This patch adds the _util.log_version context that logs the nutils version and
release name, and adds it to the context list of cli.run so that the version is
shown prior to any other output.

nutils/_util.py

@@ -427,6 +427,18 @@ def in_context(*args, **kwargs):
     return in_context_wrapper
 
 
+def log_version(f):
+
+    from . import version, version_name
+
+    @functools.wraps(f)
+    def log_version(*args, **kwargs):
+        treelog.info(f'NUTILS {version} "{version_name.title()}"')
+        return f(*args, **kwargs)
+
+    return log_version
+
+
 def log_arguments(f):
     '''Decorator to log a function's arguments.
 

nutils/cli.py

@@ -23,6 +23,7 @@ def run(f, *, argv=None):
         util.in_context(util.log_traceback),
         util.in_context(util.post_mortem),
         warnings.via(treelog.warning),
+        util.log_version,
         util.log_arguments,
         util.timeit(),
     )