format.sh

#!/bin/bash
set -e

ISSUE_NUMBER=$1
OLD_TITLE=$2
PREFIX=$3
PLACEHOLDER=$4
DRY_RUN=$5

# Fallback to default if prefix is empty
if [ -z "$PREFIX" ]; then
  PREFIX="GEN"
fi

YEAR=$(date +%y)
PADDED_NUM=$(printf "%04d" "$ISSUE_NUMBER")
IDENTIFIER="[${PREFIX}-${YEAR}${PADDED_NUM}]: "

# Skip if already present
if echo "$OLD_TITLE" | grep -q "$IDENTIFIER"; then
  echo "Identifier already present. Skipping."
  exit 0
fi

# Replace placeholder at start if provided
if [ -n "$PLACEHOLDER" ] && echo "$OLD_TITLE" | grep -q "^$PLACEHOLDER"; then
  NEW_TITLE=$(echo "$OLD_TITLE" | sed "s/^$PLACEHOLDER[[:space:]]*/$IDENTIFIER/")
else
  # Insert after emoji if present
  if [[ "$OLD_TITLE" =~ ^([[:space:]]*[^[:alnum:][:space:]]+[[:space:]]*)(.*) ]]; then
    EMOJI="${BASH_REMATCH[1]}"
    REST="${BASH_REMATCH[2]}"
    NEW_TITLE="${EMOJI} ${IDENTIFIER}${REST}"
  else
    NEW_TITLE="${IDENTIFIER}${OLD_TITLE}"
  fi
fi

# Normalize spacing
NEW_TITLE=$(echo "$NEW_TITLE" | sed 's/  */ /g' | sed 's/^ *//;s/ *$//')

echo "New title would be: $NEW_TITLE"

if [ "$DRY_RUN" = "true" ]; then
  echo "Dry-run enabled. Not updating title."
  exit 0
fi

gh issue edit "$ISSUE_NUMBER" --title "$NEW_TITLE" --repo "${GITHUB_REPOSITORY}"
echo "Title updated successfully."