add Makefile to create docx documents from the wiki

.gitignore

@@ -65,3 +65,7 @@ daffodil-debugger-*
 
 # ignore generated schema files
 server/sbtXjc/resources/xsd/*.xsd
+
+# generated documents
+doc/*.docx
+doc/.wiki/

doc/Makefile

@@ -0,0 +1,49 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Requires: make, git, sed, and pandoc
+
+# Directory containing the wiki markdown files
+SRCDIR := .wiki/
+
+# Filter out .md files starting with underscore and generate corresponding .docx filenames
+DOCX = $(addsuffix .docx, $(filter-out _%, $(basename $(notdir $(wildcard $(SRCDIR)*.md)))))
+
+# Function to sanitize filenames
+sanitize = $(shell echo $(1) | sed -e 's/[^a-zA-Z0-9.\-]/_/g' -e 's/__*/_/g' -e 's/_\-/-/g')
+
+# Target to clone the git wiki repository
+$(SRCDIR):
+	git clone https://github.com/apache/daffodil-vscode.wiki.git $(SRCDIR)
+
+# Target to generate docx from md
+%.docx:
+	@# Convert img tags to markdown syntax for pandoc
+	sed -r 's!<img[^>]* src="([^"]+)"[^>]*>!\![](\1)!g' "$(SRCDIR)$(addsuffix .md,$(basename $@))" | pandoc -t docx -f gfm --resource-path=$(SRCDIR) --toc=true -o "$(call sanitize,$@)" -
+
+# Target to update the wiki repository
+update: $(SRCDIR)
+	git -C $(SRCDIR) pull
+
+# Main target to update the repo and then generate the docx files
+all: update
+	${MAKE} $(DOCX)
+
+# Cleanup target
+clean:
+	rm -rf *.docx $(SRCDIR)
+
+.PHONY: update all clean
+