Add new "Script Logger" plugin

plugins/script_logger/__init__.py

@@ -0,0 +1,96 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2023 Bob Swift (rdswift)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# pylint: disable=missing-module-docstring, wrong-import-position, line-too-long
+
+PLUGIN_NAME = 'Script Logger'
+PLUGIN_AUTHOR = 'Bob Swift (rdswift)'
+PLUGIN_DESCRIPTION = '''
+This plugin provides a new script function `$logline()` to write entries
+to Picard's system log.  By default, the log level is set at `Info`, but
+any level can be used by providing the level as an optional second
+parameter to the function.
+
+The function is used as:
+
+`$logline(text[,level])`
+
+where `text` is the text to write to the log.  The entry will be written
+at log level `Info` by default, but this can be changed by specifying a
+different level as an optional second parameter.  Allowable log levels are:
+
+- E (Error)
+- W (Warning)
+- I (Info)
+- D (Debug)
+
+If an unknown level is entered, the function will use the default `Info`
+level.
+'''
+PLUGIN_VERSION = '0.1'
+PLUGIN_API_VERSIONS = ['2.0', '2.1', '2.2', '2.3', '2.6', '2.9']
+PLUGIN_LICENSE = "GPL-2.0"
+PLUGIN_LICENSE_URL = "https://www.gnu.org/licenses/gpl-2.0.txt"
+
+PLUGIN_USER_GUIDE_URL = "https://github.com/rdswift/picard-plugins/blob/2.0_RDS_Plugins/plugins/script_logger/docs/README.md"
+
+DOCUMENTATION = """\
+`$logline(text[,level])`
+
+where `text` is the text to write to the log.  The entry will be written
+at log level `Info` by default, but this can be changed by specifying a
+different level as an optional second parameter.  Allowable log levels are:
+
+- E (Error)
+- W (Warning)
+- I (Info)
+- D (Debug)
+
+If an unknown level is entered, the function will use the default `Info`
+level.
+"""
+
+from picard import log
+from picard.script import register_script_function
+
+LEVELS = {
+    'E': log.error,
+    'W': log.warning,
+    'I': log.info,
+    'D': log.debug,
+}
+
+def logline(_parser, text: str, level=None):
+    """Logs text to the Picard log.
+
+    Args:
+        _parser (parser): Script parser
+        text (str): Text message to log
+        level (str, optional): Level to use for logging ('E', 'W', 'I' or 'D'). Defaults to 'I'.
+    """
+    if level:
+        _level = (str(level).strip().upper() + 'I')[0]
+    else:
+        _level = 'I'
+    if _level not in LEVELS:
+        _level = 'I'
+    LEVELS[_level](text.strip())
+    return ''
+
+register_script_function(logline, documentation=DOCUMENTATION)