using awk to parse out supported templates

lib/supported_extensions.awk

@@ -0,0 +1,22 @@
+BEGIN {
+  extensions="md html"
+}
+
+# Process lines from config
+# Also ignore comments and empty lines
+(NF > 0) && (!/^;.*/) {
+  split($0, filter_kv, ": ")
+  split(filter_kv[1], filter_extensions, ",")
+
+  for (i = 1; i <= length(filter_extensions); i++) {
+    ext = filter_extensions[i]
+    if (!match(extensions, ext)) {
+      extensions = extensions " " ext
+    }
+  }
+  next
+}
+
+END {
+  print extensions
+}