From 3ba17777da88b7b315f9f47db5a05903509297cb Mon Sep 17 00:00:00 2001
From: Dmitrii Orlov <dmitry-orlov@hotmail.com>
Date: Fri, 25 Mar 2022 19:31:39 +0100
Subject: [PATCH] chore(release-candidate-from-github-actions): add github
 action for release management (#417)

---
 .github/workflows/rc.yml |  55 +++++++++++++++++++
 .gitignore               |   2 +
 bin/update_changelog.sh  | 115 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 172 insertions(+)
 create mode 100644 .github/workflows/rc.yml
 create mode 100755 bin/update_changelog.sh

diff --git a/.github/workflows/rc.yml b/.github/workflows/rc.yml
new file mode 100644
index 0000000..dbd6e7d
--- /dev/null
+++ b/.github/workflows/rc.yml
@@ -0,0 +1,55 @@
+# Release Candidate GitHub Action
+
+name: release_candidate
+
+# TODO(actions):
+# - [x] create a new AUTO-RC-<DATE> branch
+# - [x] update CHANGES.rst
+# - [x] create changes commit
+# - [x] push to GH
+# - [ ] update README.rst
+# - [ ] create readme commit
+# - [ ] push to GH
+# - [ ] open a PR to `master`
+
+# TODO(general):
+# - [ ] setup the action
+# - [ ] cleanup the action
+
+on:
+  schedule:
+    - cron:  '0 0 1 * *'  # each 1st day of the month
+  workflow_dispatch:      # on manual trigger
+
+
+jobs:
+  new-rc:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          # Flag to fetch all history.
+          #   @see https://github.com/marketplace/actions/checkout#Fetch-all-history-for-all-tags-and-branches
+          fetch-depth: 0
+      - run: |
+          RC_DATE=$(date +'%m-%d-%Y')
+          git config user.name github-actions
+          git config user.email github-actions@github.com
+          git checkout -b auto-release-candidate-${RC_DATE}
+          git push -u origin auto-release-candidate-${RC_DATE}
+
+          git status
+          git fetch
+
+          ./bin/update_changelog.sh
+
+          git add CHANGES.rst
+          git commit -m "chore(rc-changes): update Changes.rst"
+          git push
+
+          gh pr create  --title "chore(auto-release-candidate-${RC_DATE})" \
+                        --body "Automated release candidate for ${RC_DATE}." \
+                        --base master \
+                        --draft
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index af31ba3..8fc1802 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,3 +47,5 @@ __pycache__/
 .venv/
 venv/
 
+# Release Candidate Artifacts
+rc/
\ No newline at end of file
diff --git a/bin/update_changelog.sh b/bin/update_changelog.sh
new file mode 100755
index 0000000..5ff5ce4
--- /dev/null
+++ b/bin/update_changelog.sh
@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+
+# Script to create a new RC entry
+#
+# Actions:
+# 1. find latest published version
+# 2. find the TBD planned big version
+# 3. create new RC version entry
+# 4. add change log entries
+
+set -e # exit on errors
+
+# TODO: provide that as parameters?
+
+CHANGE_FILE='CHANGES.rst'
+RC_DATE=$(date +'%m-%d-%Y')
+WORKSPACE_DIR="${GITHUB_WORKSPACE:-.}/rc"
+TMP_CHANGE_LOG="${WORKSPACE_DIR}/rc-${RC_DATE}.txt"
+
+
+############
+# CLEANUPS #
+############
+
+rm -rf $TMP_CHANGE_LOG
+mkdir -p $WORKSPACE_DIR
+
+
+##################
+# INITIALIZATION #
+##################
+
+echo "Updating $CHANGE_FILE:"
+
+LAST_VERSION=$(grep -m1 -E ' \([0-9]+-[0-9]+-[0-9]+\)$' $CHANGE_FILE | awk '{ print $1 }')
+
+echo "Detected last release version: $LAST_VERSION"
+
+
+###################
+# VERSION BUMPING #
+###################
+
+
+echo "Bumping patch version..."
+MAJOR_COLUMN=1
+MINOR_COLUMN=2
+PATCH_COLUMN=3
+
+# `awk` is used to bump the PATCH version since the last public release.
+#   -F - gives a separator for splitting the original release into columns.
+#   -v - provides a value for variable to be used in the `awk` command.
+#   -v K=$PATCH_COLUMN - provides value for `K` - the version column to bump.
+# This attempts to preserve the a standard syntax for GNU Awk.
+# More can be found here: https://www.gnu.org/software/gawk/manual/gawk.html
+BUMPED_VERSION=$(echo $LAST_VERSION | awk -F. -v K=$PATCH_COLUMN '{$K+=1; print $0}' OFS='.')
+
+echo "Bumped to new candidate version: $BUMPED_VERSION"
+
+RC_VERSION=${BUMPED_VERSION}rc${RC_DATE}
+
+echo "Final RC version: $RC_VERSION"
+
+
+###################
+# CHANGELOG ENTRY #
+###################
+
+
+CHANGE_DIFF_TARGETS="v${LAST_VERSION}..HEAD"
+VERSION_TITLE="${RC_VERSION} (__rc__)"
+# Using GNU Awk syntax: -v LL specifies the title pattern variable.
+TITLE_LINE=$(awk -v LL=${#VERSION_TITLE} 'BEGIN{for(c=0;c<LL;c++) printf "-"}')
+VERSION_HEADER="$VERSION_TITLE\n${TITLE_LINE}"
+
+# DEBUG INFO
+echo -e "Comparing versions between: $CHANGE_DIFF_TARGETS\n"
+
+# VERSION HEADER:
+echo -e "$VERSION_HEADER\n" >> $TMP_CHANGE_LOG
+
+# COLLECT ALL COMMITS:
+git log --pretty=oneline --abbrev-commit $CHANGE_DIFF_TARGETS | sed 's/^/- /' >> $TMP_CHANGE_LOG
+# DEBUG:
+git log --pretty=oneline --abbrev-commit $CHANGE_DIFF_TARGETS | sed 's/^/- /'
+
+# CHECK FINAL CONTENT
+echo -e "\nCollected info:"
+ls $WORKSPACE_DIR
+cat $TMP_CHANGE_LOG
+
+# APPEND INFO TO CHANGE FILE:
+#   1. Finds the first (tbd) release
+#   2. Populates space between (tbd) release and the latest one with RC changes
+# NB: supporting macos and linux interoperability
+#     see https://stackoverflow.com/questions/43171648/sed-gives-sed-cant-read-no-such-file-or-directory
+if [[ "$OSTYPE" == "darwin"* ]]; then
+# begin: mac os support
+sed -i '' "/^[0-9]\.0\.0.*\(tbd\)/{N;G;r\
+\
+$TMP_CHANGE_LOG
+\
+}" $CHANGE_FILE
+# end;
+else
+# begin: linux support
+sed -i "/^[0-9]\.0\.0.*\(tbd\)/{N;G;r\
+\
+$TMP_CHANGE_LOG
+\
+}" $CHANGE_FILE
+# end;
+fi
+
+# CHANGE_LOG_CONTENTS=$(cat $TMP_CHANGE_LOG)