1 files changed, 104 insertions, 0 deletions
diff --git a/cligen/cligen/package.py b/cligen/cligen/package.py
new file mode 100644
index 0000000..75adf14
--- /dev/null
+++ b/cligen/cligen/package.py
@@ -0,0 +1,104 @@
+# Copyright (C) 2021-2022 Daiki Ueno
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+from typing import NamedTuple, Optional, Sequence
+from cligen.types import Desc
+import datetime
+import io
+import os
+import textwrap
+
+
+try:
+    import pwd
+
+    def get_default_copyright_holder():
+        return pwd.getpwuid(os.getuid()).pw_gecos
+except ImportError:
+    def get_default_copyright_holder():
+        return 'COPYRIGHT HOLDER'
+
+
+class Info(NamedTuple):
+    name: str
+    version: str
+    license: str = 'gpl3+'
+    copyright_year: str = str(datetime.date.today().year)
+    copyright_holder: str = get_default_copyright_holder()
+    bug_email: Optional[str] = None
+    authors: Sequence[str] = list()
+
+
+BRIEF_LICENSES = {
+    'gpl3+': textwrap.dedent('''\
+        This program is released under the terms of
+        the GNU General Public License, version 3 or later
+    ''')
+}
+SHORT_LICENSES = {
+    'gpl3+': textwrap.dedent('''\
+        This is free software. It is licensed for use, modification and
+        redistribution under the terms of the GNU General Public License,
+        version 3 or later <http://gnu.org/licenses/gpl.html>
+    ''')
+}
+FULL_LICENSES = {
+    'gpl3+': textwrap.dedent('''\
+        This is free software. It is licensed for use, modification and
+        redistribution under the terms of the GNU General Public License,
+        version 3 or later <http://gnu.org/licenses/gpl.html>
+
+        @PACKAGE_NAME@ 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 3 of the License, or (at your option) any later version.
+
+        @PACKAGE_NAME@ 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, see <http://www.gnu.org/licenses/>.
+    ''')
+}
+
+
+def license(desc: Desc, info: Info, what='short') -> str:
+    if what == 'brief':
+        license_text = BRIEF_LICENSES[info.license]
+    elif what == 'short':
+        license_text = SHORT_LICENSES[info.license]
+    elif what == 'full':
+        license_text = FULL_LICENSES[info.license]
+    return license_text.replace('@PACKAGE_NAME@', info.name)
+
+
+def version(desc: Desc, info: Info, what='c') -> str:
+    out = io.StringIO()
+
+    if what == 'v':
+        out.write(f'{desc.tool.name} {info.version}')
+    elif what == 'c':
+        out.write(textwrap.dedent(f'''\
+            {desc.tool.name} {info.version}
+            Copyright (C) {info.copyright_year} {info.copyright_holder}
+        '''))
+        out.write(license(desc, info, 'short'))
+        if info.bug_email:
+            out.write(textwrap.dedent(f'''\
+
+                Please send bug reports to:  <{info.bug_email}>\
+            '''))
+    elif what == 'n':
+        out.write(textwrap.dedent(f'''\
+            {desc.tool.name} {info.version}
+            Copyright (C) {info.copyright_year} {info.copyright_holder}
+        '''))
+        out.write(license(desc, info, 'full'))
+        if info.bug_email:
+            out.write(textwrap.dedent(f'''\
+
+                Please send bug reports to:  <{info.bug_email}>\
+            '''))
+    return out.getvalue()