From f95afe807f91c49802501f756e92211c3a553f04 Mon Sep 17 00:00:00 2001
From: Ivan Dolgov <ivan@qvarnlabs.com>
Date: Fri, 22 Sep 2017 17:08:45 +0300
Subject: Implement PlantUML support

---
 ql-ikiwiki-publish | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 86 insertions(+), 6 deletions(-)

diff --git a/ql-ikiwiki-publish b/ql-ikiwiki-publish
index be5b1a1..01cc404 100755
--- a/ql-ikiwiki-publish
+++ b/ql-ikiwiki-publish
@@ -22,6 +22,81 @@ import shutil
 import subprocess
 import sys
 import tempfile
+import fnmatch
+import re
+
+
+def process_uml_blocks(mdwnpath, mdwndir, filename):
+    blocks = []
+    tmproot = os.path.join(T, os.path.splitext(filename)[0] + '_uml')
+
+    with open(mdwnpath) as f:
+        content = f.read()
+
+        # Find UML code blocks to be replaced.
+        blocks = re.findall(
+            r"(?:\t| {4})@startuml[\s\S]*?(?:\t| {4})@enduml",
+            content
+        )
+
+    for i, block in enumerate(blocks, start=1):
+        umlpath = '%s%d.puml' % (tmproot, i)
+        imgpath = '%s%d.png' % (tmproot, i)
+
+        # Remove whitespace and save UML file.
+        with open(umlpath, 'w') as f:
+            f.write(re.sub(r"(?m)^(\t| {4})", "", block) + '\n')
+
+        # Create a diagram image at imgpath and copy it.
+        subprocess.check_call(['plantuml', umlpath])
+        shutil.copy2(imgpath, mdwndir)
+
+        # Replace diagram code with a link to the image.
+        content = ''
+        with open(mdwnpath) as f:
+            content = f.read()
+        with open(mdwnpath, 'w') as f:
+            link = '[[!img  %s]]' % os.path.basename(imgpath)
+            f.write(re.sub(block, link, content))
+
+
+def process_uml_includes(mdwnpath, mdwndir):
+    includes = []
+
+    with open(mdwnpath) as f:
+        content = f.read()
+
+        # Find include statements,
+        # put file name in a separate group.
+        includes = re.findall(
+            r"(?m)^(<!-{2,3} INCLUDE_UML: (.+\.puml) -->)",
+            content
+        )
+
+    for inc in includes:
+        # Don't need to copy an image this time
+        subprocess.check_call(['plantuml', os.path.join(mdwndir, inc[1])])
+
+        # Replace include statement with a link to the image.
+        content = ''
+        with open(mdwnpath) as f:
+            content = f.read()
+        with open(mdwnpath, 'w') as f:
+            link = '[[!img  %s.png]]' % os.path.splitext(inc[1])[0]
+            f.write(re.sub('(?m)^' + inc[0], link, content))
+
+
+def process_uml(T, dirname='.', ignore=['.git', '.ikiwiki']):
+    for topdir, dirs, files in os.walk(os.path.abspath(dirname), topdown=True):
+        # Filter dirs by modifying the list in-place,
+        # as described in os.walk documentation.
+        dirs[:] = [d for d in dirs if d not in ignore]
+
+        for filename in fnmatch.filter(files, '*.mdwn'):
+            mdwnpath = os.path.join(topdir, filename)
+
+            process_uml_blocks(mdwnpath, topdir, filename)
+            process_uml_includes(mdwnpath, topdir)
 
 
 def mangle_setup(src, dest, html):
@@ -42,18 +117,23 @@ def mangle_setup(src, dest, html):
         f.write(mangled)
 
 
-static_http = sys.argv[1]
-dirname = sys.argv[2]
-rsync_target = 'static@{}:/srv/http/{}/.'.format(static_http, dirname)
-
-T = tempfile.mkdtemp()
-try:
+def run_ikiwiki(T):
     setup = os.path.join(T, 'ikiwiki.setup')
     html = os.path.join(T, 'html')
     mangle_setup('ikiwiki.setup', setup, html)
     subprocess.check_call(['ikiwiki', '--setup', setup, '--gettime'])
     subprocess.check_call(
         ['rsync', '-ahHSvs', '--delete', html + '/.', rsync_target])
+
+
+static_http = sys.argv[1]
+dirname = sys.argv[2]
+rsync_target = 'static@{}:/srv/http/{}/.'.format(static_http, dirname)
+
+T = tempfile.mkdtemp()
+try:
+    process_uml(T)
+    run_ikiwiki(T)
 except BaseException as e:
     shutil.rmtree(T)
     raise
-- 
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