Add script for changelog generation

generate_changelog.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+
+set -e
+
+mydir="$(dirname "$(realpath "$0")")"
+
+pushd "$mydir" > /dev/null
+
+source ./merge_helpers.sh
+
+# Check branch
+check_branch $branch
+forall_repos check_branch $branch
+
+# Ensure clean git state
+forall_repos check_clean_git
+
+# Fetch upstream
+forall_repos git fetch origin > /dev/null
+forall_repos git fetch upstream > /dev/null
+
+(
+    # Add new line below git log: https://unix.stackexchange.com/a/345558
+
+    get_latest_upstream_tag
+    forelement_repos git log --pretty=format:"- %s" "sc" "^$latest_upstream_tag" "^master" \
+        | printf '%s\n' "$(cat)" \
+        | sed "s|Merge tag '\\(.*\\)' into sc.*|Update codebase to Element \1|" \
+        | sed "s|Merge tag '\\(.*\\)' into merge.*|Update codebase to Element \1|"
+
+    get_current_mxsdk_tags
+
+    pushd "matrix-js-sdk" > /dev/null
+    git log --pretty=format:"- %s" "sc" "^$current_mxjssdk_tag" "^master" \
+        | printf '%s\n' "$(cat)" \
+        | grep -v "Merge .*tag"
+    popd > /dev/null
+
+    pushd "matrix-react-sdk" > /dev/null
+    git log --pretty=format:"- %s" "sc" "^$current_mxreactsdk_tag" "^master" \
+        | printf '%s\n' "$(cat)" \
+        | grep -v "Merge .*tag"
+    popd > /dev/null
+) \
+    | grep -v "Automatic i18n reversion" \
+    | grep -v "Automatic package.json reversion" \
+    | grep -v "Merge .*branch" \
+    | grep -v "Automatic theme update" \
+    | grep -v "Automatic package.json adjustment" \
+    | grep -v "Automatic i18n adjustment" \
+    | grep -v "Update version to .*-sc\\..*" \
+    | grep -v "\\.sh" \
+    | grep -v "\\.md" \
+    | grep -v "Added translation using Weblate" \
+    | grep -v "Translated using Weblate" \
+    | grep -v "weblate/sc" \
+    | grep -v "\\[.*merge.*\\]" \
+    | awk '!seen[$0]++' `# https://stackoverflow.com/a/1444448` \
+    || echo "No significant changes since the last stable release"
+
+popd > /dev/null