Added incremental build support for CSS regeneration based on HTML/Markdown file changes.

Author: liberaldev

_plugins/tailwind_incremental_fix.rb

@@ -0,0 +1,69 @@
+# Regenerate CSS only when HTML/Markdown files change
+
+module Jekyll
+  module PostcssTrigger
+    class << self
+      attr_accessor :last_check_time, :css_touched
+    end
+  end
+end
+
+Jekyll::Hooks.register :site, :post_read do |site|
+  # Skip if not in incremental mode
+  next unless site.config['incremental']
+
+  # On first build, only record the check time
+  if Jekyll::PostcssTrigger.last_check_time.nil?
+    Jekyll::PostcssTrigger.last_check_time = Time.now
+    Jekyll::PostcssTrigger.css_touched = false
+    next
+  end
+
+  # Skip if CSS was already touched in this build
+  next if Jekyll::PostcssTrigger.css_touched
+
+  # Check if any HTML/Markdown files have changed
+  content_patterns = [
+    "_layouts/**/*.html",
+    "_includes/**/*.html",
+    "*.html",
+    "*.md",
+    "*/**/*.html",
+    "*/**/*.md"
+  ]
+
+  html_changed = false
+  last_check = Jekyll::PostcssTrigger.last_check_time
+
+  content_patterns.each do |pattern|
+    Dir.glob(site.in_source_dir(pattern)).each do |file|
+      next if file.start_with?(site.dest) # Exclude _site directory
+
+      # Check if file was modified since last check
+      if File.exist?(file) && File.mtime(file) > last_check
+        html_changed = true
+        Jekyll.logger.info "PostCSS Trigger:", "Detected change in #{File.basename(file)}"
+        break
+      end
+    end
+    break if html_changed
+  end
+
+  # Touch CSS file if HTML has changed
+  if html_changed
+    css_file = site.in_source_dir("stylesheets/main.css")
+    if File.exist?(css_file)
+      Jekyll.logger.info "PostCSS Trigger:", "Marking CSS for rebuild"
+      FileUtils.touch(css_file)
+      Jekyll::PostcssTrigger.css_touched = true
+    end
+  end
+
+  # Update check time
+  Jekyll::PostcssTrigger.last_check_time = Time.now
+end
+
+# Reset flag after build completes
+Jekyll::Hooks.register :site, :post_write do |site|
+  Jekyll::PostcssTrigger.css_touched = false
+end