Migrate Jekyll filename-based post dates to Astro pubDate frontmatter

migrate-jekyll-posts-to-astro.sh

#!/bin/sh

BLOG_DIR="src/content/blog"

# Loop through each .md file in the directory
for file in "$BLOG_DIR"/*.md; do
  # Extract the filename without the directory path
  filename=$(basename "$file")
  
  # Extract the date portion from the filename (yyyy-mm-dd)
  date=$(echo "$filename" | grep -Eo '^[0-9]{4}-[0-9]{2}-[0-9]{2}')
  
  # Check if the date was extracted successfully
  if [[ -n "$date" ]]; then
    # Check if the file already contains a pubDate
    if grep -q "^pubDate:" "$file"; then
      echo "pubDate already exists in $file, skipping pubDate insertion..."
    else
      # Insert the pubDate into the frontmatter section
      awk -v date="$date" '
        BEGIN { found = 0 }
        /^---$/ { found++ }
        found == 2 && !pubDateInserted {
          print "pubDate: " date
          pubDateInserted = 1
        }
        { print }
      ' "$file" > "$file.tmp" && mv "$file.tmp" "$file"
      
      echo "Updated pubDate in $file"
    fi

    # Rename the file to omit the date in the filename
    new_filename=$(echo "$filename" | sed -E 's/^[0-9]{4}-[0-9]{2}-[0-9]{2}-//')
    mv "$file" "$BLOG_DIR/$new_filename"
    echo "Renamed $file to $new_filename"
  else
    echo "No date found in filename $filename"
  fi
done