Adding a -q option to the logstart magic to suppress output of log state. Also added a command line option

IPython/core/magics/logging.py

@@ -19,6 +19,7 b' import sys'
 # Our own packages
 from IPython.core.magic import Magics, magics_class, line_magic
 from warnings import warn
+from traitlets import Bool
 
 #-----------------------------------------------------------------------------
 # Magic implementation classes
@@ -28,11 +29,17 b' from warnings import warn'
 class LoggingMagics(Magics):
     """Magics related to all logging machinery."""
 
+    quiet = Bool(False, help=
+        """
+        Suppress output of log state when logging is enabled
+        """
+    ).tag(config=True)
+
     @line_magic
     def logstart(self, parameter_s=''):
         """Start logging anywhere in a session.
 
-        %logstart [-o|-r|-t] [log_name [log_mode]]
+        %logstart [-o|-r|-t|-q] [log_name [log_mode]]
 
         If no name is given, it defaults to a file named 'ipython_log.py' in your
         current directory, in 'rotate' mode (see below).
@@ -82,12 +89,16 b' class LoggingMagics(Magics):'
           -t
             put timestamps before each input line logged (these are put in
             comments).
+
+          -q 
+            suppress output of logstate message when logging is invoked
         """
 
-        opts,par = self.parse_options(parameter_s,'ort')
+        opts,par = self.parse_options(parameter_s,'ortq')
         log_output = 'o' in opts
         log_raw_input = 'r' in opts
         timestamp = 't' in opts
+        quiet = 'q' in opts
 
         logger = self.shell.logger
 
@@ -145,9 +156,10 b' class LoggingMagics(Magics):'
                 # re-enable timestamping
                 logger.timestamp = True
 
-            print ('Activating auto-logging. '
-                   'Current session state plus future input saved.')
-            logger.logstate()
+            if not (self.quiet or quiet):
+                print ('Activating auto-logging. '
+                       'Current session state plus future input saved.')
+                logger.logstate()
 
     @line_magic
     def logstop(self, parameter_s=''):

IPython/core/tests/test_magic.py

@@ -6,6 +6,7 b' Needs to be run by nose (to make ipython session available).'
 
 import io
 import os
+import re
 import sys
 import warnings
 from unittest import TestCase
@@ -20,7 +21,7 b' from IPython.core.error import UsageError'
 from IPython.core.magic import (Magics, magics_class, line_magic,
                                 cell_magic,
                                 register_line_magic, register_cell_magic)
-from IPython.core.magics import execution, script, code
+from IPython.core.magics import execution, script, code, logging
 from IPython.testing import decorators as dec
 from IPython.testing import tools as tt
 from IPython.utils import py3compat
@@ -977,3 +978,35 b' def test_strip_initial_indent():'
     nt.assert_equal(sii("  a = 1\nb = 2"), "a = 1\nb = 2")
     nt.assert_equal(sii("  a\n    b\nc"), "a\n  b\nc")
     nt.assert_equal(sii("a\n  b"), "a\n  b")
+
+def test_logging_magic_quiet_from_arg():
+    _ip.config.LoggingMagics.quiet = False
+    lm = logging.LoggingMagics(shell=_ip)
+    with TemporaryDirectory() as td:
+        try:
+            with tt.AssertNotPrints(re.compile("Activating.*")):
+                lm.logstart('-q {}'.format(
+                        os.path.join(td, "quiet_from_arg.log")))
+        finally:
+            _ip.logger.logstop()
+
+def test_logging_magic_quiet_from_config():
+    _ip.config.LoggingMagics.quiet = True
+    lm = logging.LoggingMagics(shell=_ip)
+    with TemporaryDirectory() as td:
+        try:
+            with tt.AssertNotPrints(re.compile("Activating.*")):
+                lm.logstart(os.path.join(td, "quiet_from_config.log"))
+        finally:
+            _ip.logger.logstop()
+    
+def test_logging_magic_not_quiet():
+    _ip.config.LoggingMagics.quiet = False
+    lm = logging.LoggingMagics(shell=_ip)
+    with TemporaryDirectory() as td:
+        try:
+            with tt.AssertPrints(re.compile("Activating.*")):
+                lm.logstart(os.path.join(td, "not_quiet.log"))
+        finally:
+            _ip.logger.logstop()
+    

IPython/terminal/ipapp.py

@@ -25,7 +25,9 b' from IPython.core.history import HistoryManager'
 from IPython.core.application import (
     ProfileDir, BaseIPythonApplication, base_flags, base_aliases
 )
-from IPython.core.magics import ScriptMagics
+from IPython.core.magics import (
+    ScriptMagics, LoggingMagics
+)
 from IPython.core.shellapp import (
     InteractiveShellApp, shell_flags, shell_aliases
 )
@@ -202,6 +204,7 b' class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):'
             PlainTextFormatter,
             IPCompleter,
             ScriptMagics,
+            LoggingMagics,
             StoreMagics,
         ]