ci: Tweak command parsing

 - Fix wrong index variable in loop ("i" vs "INDEX") that prevented
   detection of commands at arbitrary places in a comment.
 - Fix parsing of comments with newlines.
 - Normalize commands to lowercase before checking them.
 - Enhance debugging of command parsing.
 - Allow the user to say "please" because it just feels nicer to me,
   even when I'm talking to a robot.

.github/workflows/shaka-bot-commands/lib.sh

@@ -64,19 +64,35 @@ function start_workflow() {
   gh workflow run "$WORKFLOW" -R "$THIS_REPO" "${GH_ARGS[@]}"
 }
 
+# Simple alias for converting a stream of text to lowercase.
+function tolower() {
+  tr '[:upper:]' '[:lower:]'
+}
+
 # Outputs to global variables SHAKA_BOT_COMMAND and SHAKA_BOT_ARGUMENTS (array).
 function parse_command() {
-  # Tokenize the comment by whitespace.
-  local TOKENS=( $COMMENT_BODY )
-
-  local INDEX
-  for (( INDEX=0; INDEX < ${#TOKENS[@]}; INDEX++ )); do
-    if [[ "${TOKENS[i]}" == "@shaka-bot" ]]; then
-      SHAKA_BOT_COMMAND="${TOKENS[i+1]}"
-      # A slice of all tokens starting with index i+2.
-      SHAKA_BOT_ARGUMENTS=( "${TOKENS[@]:i+2}" )
-      return 0
-    fi
+  # Read each line one at a time.  Tokens from one line won't affect another.
+  echo "$COMMENT_BODY" | while read COMMENT_LINE; do
+    # Tokenize the comment by whitespace.
+    local TOKENS=( $COMMENT_LINE )
+
+    local INDEX
+    for (( INDEX=0; INDEX < ${#TOKENS[@]}; INDEX++ )); do
+      if [[ "${TOKENS[INDEX]}" == "@shaka-bot" ]]; then
+        # The next word is the command.
+        SHAKA_BOT_COMMAND=$(echo "${TOKENS[INDEX+1]}" | tolower)
+
+        # Unless it's please, then it's the word after that.
+        if [[ "$SHAKA_BOT_COMMAND" == "please" ]]; then
+          INDEX=$((INDEX + 1))
+          SHAKA_BOT_COMMAND=$(echo "${TOKENS[INDEX+1]}" | tolower)
+        fi
+
+        # A slice of all tokens starting with index INDEX+2.
+        SHAKA_BOT_ARGUMENTS=( "${TOKENS[@]:INDEX+2}" )
+        return 0
+      fi
+    done
   done
 
   return 1

.github/workflows/shaka-bot-commands/main.sh

@@ -42,10 +42,12 @@ if [[ "$SHAKA_BOT_COMMAND" == "" ]]; then
   exit 0
 fi
 
-echo "PR $PR_NUMBER, detected command $SHAKA_BOT_COMMAND"
+echo "PR $PR_NUMBER"
+echo "Detected command \"$SHAKA_BOT_COMMAND\""
+echo "Detected arguments \"$SHAKA_BOT_ARGUMENTS\""
 
 case "$SHAKA_BOT_COMMAND" in
   help) . command-help.sh ;;
   test) . command-test.sh ;;
-  *) echo "Unknown command!" ;;
+  *) echo "Unknown command" ;;
 esac

.github/workflows/talk-to-shaka-bot.yaml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   handle_command:
+    name: Handle Command
     # Only runs on PRs that contain '@shaka-bot' comments, but not comments
     # made by shaka-bot itself, who will sometimes use its own name.
     # Note that contains() is not case sensitive.