show diffs in dev releases

scripts/release_notes.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+#
+# Builds the release body for a dev build and writes it to stdout.
+#
+#   scripts/release_notes.sh <previous release ref> <version>
+#
+# The summary is the set of CHANGELOG_LATEST.md lines added since the previous
+# dev release, kept under their own headings. The full changelog and the commit
+# list follow, both collapsed.
+
+set -euo pipefail
+
+PREV_REF=${1:?usage: release_notes.sh <previous release ref> <version>}
+VERSION=${2:?usage: release_notes.sh <previous release ref> <version>}
+
+CHANGELOG=CHANGELOG_LATEST.md
+REPO_URL="https://github.com/${GITHUB_REPOSITORY:-emsesp/EMS-ESP32}"
+MAX_COMMITS=250
+
+prev_version=$(git show "${PREV_REF}:src/emsesp_version.h" 2>/dev/null |
+    awk -F'"' '/EMSESP_APP_VERSION/ { print $2 }')
+
+added=$(mktemp)
+trap 'rm -f "${added}"' EXIT
+git diff -U0 "${PREV_REF}..HEAD" -- "${CHANGELOG}" |
+    sed -n 's/^+\([^+].*\)/\1/p' >"${added}"
+
+# walk the changelog so the added lines keep the order and headings they have there
+summary=$(awk '
+    NR == FNR { if (NF) wanted[$0] = 1; next }
+    /^#+ / { sub(/^#+ /, ""); heading = $0; next }
+    $0 in wanted && !seen[$0]++ {
+        if (heading != shown) { printf "\n### %s\n\n", heading; shown = heading }
+        print
+    }
+' "${added}" "${CHANGELOG}")
+
+echo "Development build of EMS-ESP v${VERSION}."
+echo
+
+if [ -n "${summary}" ]; then
+    echo "## Changes since ${prev_version:-the previous dev build}"
+    echo "${summary}"
+    echo
+elif [ -n "${prev_version}" ]; then
+    echo "No changelog entries were added since ${prev_version}, see the commits below."
+    echo
+fi
+
+echo "<details>"
+echo "<summary>Full v${VERSION%%-*} changelog so far</summary>"
+echo
+sed '1,/^For more details go to/d' "${CHANGELOG}" | awk 'NF || seen { print; seen = 1 }'
+echo
+echo "</details>"
+echo
+
+count=$(git rev-list --no-merges --count "${PREV_REF}..HEAD")
+echo "<details>"
+echo "<summary>Commits (${count})</summary>"
+echo
+git log --no-merges --max-count="${MAX_COMMITS}" \
+    --pretty=format:"- [\`%h\`](${REPO_URL}/commit/%H) %s (%an)" "${PREV_REF}..HEAD"
+echo
+if [ "${count}" -gt "${MAX_COMMITS}" ]; then
+    echo
+    echo "... and $((count - MAX_COMMITS)) more."
+fi
+echo
+echo "</details>"
+echo
+echo "[Compare all changes](${REPO_URL}/compare/${PREV_REF}...$(git rev-parse HEAD))"