helper-scripts: add helper scripts used in release process

helper-scripts/README.md

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+These scripts automate some tasks related to release process.
+
+* __`relicence.py`__ rewrites licence headers in all non-empty Python files
+* __`linkify-changelog.py`__ generates Markdown links to github issues/PRs in changelog

helper-scripts/linkify-changelog.py

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+#!/usr/bin/env python3
+
+import os
+import re
+
+LINK_RE = re.compile(r"\[#(\d+)\]")
+ISSUE_URL = "https://github.com/trezor/python-trezor/issues/"
+
+CHANGELOG = os.path.dirname(__file__) + "/../CHANGELOG.md"
+
+changelog_entries = set()
+result_lines = []
+
+with open(CHANGELOG, "r+") as changelog:
+    for line in changelog:
+        if ISSUE_URL in line:
+            break
+        for n in LINK_RE.findall(line):
+            changelog_entries.add(int(n))
+        result_lines.append(line)
+
+    changelog.seek(0)
+    changelog.truncate(0)
+    for line in result_lines:
+        changelog.write(line)
+    for issue in sorted(changelog_entries):
+        changelog.write(f"[#{issue}]: {ISSUE_URL}{issue}\n")

helper-scripts/relicence.py

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+#!/usr/bin/env python3
+
+LICENSE_NOTICE = """\
+# This file is part of the Trezor project.
+#
+# Copyright (C) 2012-2018 SatoshiLabs and contributors
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# This library 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the License along with this library.
+# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
+
+"""
+
+EXCLUDE_FILES = ["trezorlib/__init__.py", "trezorlib/_ed25519.py"]
+
+
+def one_file(fp):
+    lines = list(fp)
+    new = lines[:]
+    while new and new[0][0] == "#":
+        new.pop(0)
+
+    while new and new[0].strip() == "":
+        new.pop(0)
+
+    data = "".join([LICENSE_NOTICE] + new)
+
+    fp.seek(0)
+    fp.write(data)
+    fp.truncate()
+
+
+import glob
+import os
+
+for fn in glob.glob("trezorlib/**/*.py", recursive=True):
+    if fn in EXCLUDE_FILES:
+        continue
+    statinfo = os.stat(fn)
+    if statinfo.st_size == 0:
+        continue
+    with open(fn, "r+") as fp:
+        one_file(fp)