Move all awk functions to separate files

awk/fenced_code.awk

@@ -0,0 +1,27 @@
+BEGIN { in_fence = 0; first_line = 0 }
+{
+    if (!in_fence && $0 ~ /^```/) {
+        in_fence = 1
+        first_line = 1
+        next
+    }
+    if (in_fence && $0 ~ /^```[[:space:]]*$/) {
+        print "</code></pre>"
+        in_fence = 0
+        next
+    }
+    if (in_fence) {
+        if (first_line) {
+            first_line = 0
+            if ($0 == "") next
+            print "<pre><code>" $0
+        } else {
+            print
+        }
+    } else {
+        print
+    }
+}
+END {
+    if (in_fence) print "</code></pre>"
+}