From ac1774c848b66f6f8c525e8609ca6e029c1de75e Mon Sep 17 00:00:00 2001
From: somas95 <manuel.genoves@gmail.com>
Date: Thu, 12 Apr 2018 21:55:45 +0200
Subject: [PATCH] convert relative paths to absolute on preview

---
 data/lua/relative_to_absolute.lua | 21 +++++++++++++++++++++
 data/{media => lua}/task-list.lua |  0
 uberwriter/UberwriterWindow.py    | 15 +++++++++++----
 uberwriter_lib/helpers.py         |  6 ++++++
 4 files changed, 38 insertions(+), 4 deletions(-)
 create mode 100644 data/lua/relative_to_absolute.lua
 rename data/{media => lua}/task-list.lua (100%)

diff --git a/data/lua/relative_to_absolute.lua b/data/lua/relative_to_absolute.lua
new file mode 100644
index 0000000..23b8017
--- /dev/null
+++ b/data/lua/relative_to_absolute.lua
@@ -0,0 +1,21 @@
+function string.starts(String,Start)
+   return string.sub(String,1,string.len(Start))==Start
+end
+
+function fix_path (path)
+  if string.starts(path, "/") then
+    return path
+  else
+    return (os.getenv('PANDOC_PREFIX') or '') .. path
+  end
+end
+
+function Link (element)
+  element.target = fix_path(element.target)
+  return element
+end
+
+function Image (element)
+  element.src = fix_path(element.src)
+  return element
+end
diff --git a/data/media/task-list.lua b/data/lua/task-list.lua
similarity index 100%
rename from data/media/task-list.lua
rename to data/lua/task-list.lua
diff --git a/uberwriter/UberwriterWindow.py b/uberwriter/UberwriterWindow.py
index 6900b8d..18f6d81 100644
--- a/uberwriter/UberwriterWindow.py
+++ b/uberwriter/UberwriterWindow.py
@@ -694,15 +694,22 @@ class UberwriterWindow(Window):
             # TODO
             # Find a way to find the next header, scroll to the next header.
             # TODO: provide a local version of mathjax
-            
+
+            # We need to convert relative routes to absolute ones
+            if self.filename:
+                base_path = os.path.dirname(self.filename)
+            else:
+                base_path = ''
+            os.environ['PANDOC_PREFIX'] = base_path + '/'
+
             args = ['pandoc',
                     '-s',
                     '--from=markdown',
-                    '--to=html',
+                    '--to=html5',
                     '--mathjax',
                     '--css=' + helpers.get_media_path('uberwriter.css'),
-                    '--lua-filter=' + helpers.get_media_path('task-list.lua')]
-            print(args)
+                    '--lua-filter=' + helpers.get_script_path('relative_to_absolute.lua'),
+                    '--lua-filter=' + helpers.get_script_path('task-list.lua')]
 
             p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
 
diff --git a/uberwriter_lib/helpers.py b/uberwriter_lib/helpers.py
index be12634..4e3f57f 100644
--- a/uberwriter_lib/helpers.py
+++ b/uberwriter_lib/helpers.py
@@ -61,6 +61,12 @@ def get_media_path(media_file_name):
         media_filename = None
     return media_filename
 
+def get_script_path(script_file_name):
+    script_filename = get_data_file('lua', '%s' % (script_file_name,))
+    if not os.path.exists(script_filename):
+        script_filename = None
+    return script_filename
+
 class NullHandler(logging.Handler):
     def emit(self, record):
         pass