[build] update change log file to accept language

scripts/update-changelogs.sh

@@ -1,22 +1,58 @@
 #!/usr/bin/env bash
 
 # Update changelogs in each of the bindings based on commits between provided reference and HEAD
-PREVIOUS_TAG=$1
+VERSION=$1
+IFS='.' read -r MAJOR_VERSION MINOR_VERSION PATCH_VERSION <<< "$VERSION"
+LANGUAGE=$2
+
+calculate_previous_tag() {
+    if [ "$PATCH_VERSION" -ne 0 ]; then
+        PREVIOUS_TAG="selenium-$MAJOR_VERSION.$MINOR_VERSION.$(($PATCH_VERSION - 1))"
+        if [ -n "$LANGUAGE" ] && [ "$PATCH_VERSION" -gt 1 ]; then
+            PREVIOUS_TAG="${PREVIOUS_TAG}-$(get_tag_language)"
+        fi
+    elif [ $MINOR_VERSION -ne 0 ]; then
+        PREVIOUS_TAG="selenium-$MAJOR_VERSION.$(($MINOR_VERSION - 1)).0"
+    else
+        echo "Cannot determine the previous tag from $VERSION"
+        exit 1
+    fi
+}
+
+get_tag_language() {
+    case $LANGUAGE in
+        py) echo "python" ;;
+        rb) echo "ruby" ;;
+        *) echo "$LANGUAGE" ;;
+    esac
+}
 
 prepend_git_log_to_file() {
     local FILE="$1"
     local DIR="${FILE%/*}"
-
     local TEMP_FILE="$(mktemp)"
 
-    git --no-pager log "${PREVIOUS_TAG}...${HEAD}" --pretty=format:"* %B %n %an http://github.com/seleniumhq/selenium/commit/%H" --reverse -- "$DIR/" > "$TEMP_FILE"
+    git --no-pager log "${PREVIOUS_TAG}...HEAD" --pretty=format:"* %B %n %an http://github.com/seleniumhq/selenium/commit/%H" --reverse -- "$DIR/" > "$TEMP_FILE"
     echo -e "\n\n" >> "$TEMP_FILE"
 
     cat "$FILE" >> "$TEMP_FILE"
     mv "$TEMP_FILE" "$FILE"
 }
 
-git --no-pager log "${PREVIOUS_TAG}...${HEAD}" --pretty=format:"* %B %n %an http://github.com/seleniumhq/selenium/commit/%H" --reverse -- . ':!rb/' ':!py/' ':!javascript/' ':!dotnet/' ':!java/' ':!rust/' >> changelog_updates.md
+update_language_changelogs() {
+    calculate_previous_tag
+
+  for changelog in "${CHANGELOGS[@]}"; do
+      lang=$(echo "$changelog" | cut -d/ -f1)
+      if [[ "$LANGUAGE" == "$lang" || "$LANGUAGE" == "all" ]]; then
+          prepend_git_log_to_file "$changelog"
+      fi
+  done
+}
+
+print_generic_changes() {
+git --no-pager log "${PREVIOUS_TAG}...HEAD" --pretty=format:"* %B %n %an http://github.com/seleniumhq/selenium/commit/%H" --reverse -- . ':!rb/' ':!py/' ':!javascript/' ':!dotnet/' ':!java/' ':!rust/' >> changelog_updates.md
+}
 
 CHANGELOGS=(
     "dotnet/CHANGELOG"
@@ -27,6 +63,5 @@ CHANGELOGS=(
     "rust/CHANGELOG.md"
 )
 
-for changelog in "${CHANGELOGS[@]}"; do
-    prepend_git_log_to_file "$changelog"
-done
+update_language_changelogs
+print_generic_changes