From 2a7630a80b783853d6acf614abcb0faa6cf22d0c Mon Sep 17 00:00:00 2001
From: Arthas <arthaslixin1993@gmail.com>
Date: Mon, 9 Oct 2017 23:18:25 +0800
Subject: [PATCH] add {% vm %} to make the table cell virtically merged within
 a {% for %}

---
 docxtpl/__init__.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/docxtpl/__init__.py b/docxtpl/__init__.py
index f1cb15d..7beeb8f 100644
--- a/docxtpl/__init__.py
+++ b/docxtpl/__init__.py
@@ -84,7 +84,17 @@ class DocxTemplate(object):
             # This is mandatory to have jinja2 generating correct xml code
             pat = r'<w:%(y)s[ >](?:(?!<w:%(y)s[ >]).)*({%%|{{)%(y)s ([^}%%]*(?:%%}|}})).*?</w:%(y)s>' % {'y':y}
             src_xml = re.sub(pat, r'\1 \2',src_xml,flags=re.DOTALL)
-
+        
+        # add vMerge
+        # use {% vm %} to make this table cell and its copies be vertically merged within a {% for %}
+        pat_vm = r'(<\/w:tcPr>.*)(<\/w:tcPr>)(.*?){%vm%}.*?<w:t>(.*?)(<\/w:t>)'
+        def vMerge(m):
+            return m.group(1) + '<w:vMerge {% if loop.first %}w:val="restart"{% endif %}/>' + m.group(2) + m.group(3) + "{% if loop.first %}"+ m.group(4) +"{% endif %}" + m.group(5)
+        pat_num_vm = re.compile(r'{%vm%}')
+        num = len(pat_num_vm.findall(src_xml))
+        for i in range(0,num):
+            src_xml = re.sub(pat_vm,vMerge,src_xml)
+        
         def clean_tags(m):
             return m.group(0).replace(r"&#8216;","'").replace('&lt;','<').replace('&gt;','>')
         src_xml = re.sub(r'(?<=\{[\{%])(.*?)(?=[\}%]})',clean_tags,src_xml)