From 7d7c588c60ebf6615baf8f1ab85aec0a6948e5df Mon Sep 17 00:00:00 2001
From: Vinayak Mehta <vmehta94@gmail.com>
Date: Sat, 29 Aug 2020 20:47:53 +0530
Subject: [PATCH] Use warnings and add italic support

---
 present/effects.py   |  1 +
 present/markdown.py  | 19 ++++++++++++++++---
 present/slideshow.py | 10 +++++++++-
 3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/present/effects.py b/present/effects.py
index 313fcc1..7e2d89f 100644
--- a/present/effects.py
+++ b/present/effects.py
@@ -27,6 +27,7 @@
     "white": Screen.COLOUR_WHITE,
 }
 ATTRS = {
+    "italic": 5,
     "bold": Screen.A_BOLD,
     "underline": Screen.A_UNDERLINE,
 }
diff --git a/present/markdown.py b/present/markdown.py
index 81d0d3c..1bc9b4e 100644
--- a/present/markdown.py
+++ b/present/markdown.py
@@ -4,6 +4,7 @@
 import re
 import sys
 import shutil
+import warnings
 from dataclasses import dataclass
 
 import yaml
@@ -13,6 +14,10 @@
 from .effects import EFFECTS, COLORMAP
 
 
+# For future reference
+UNSUPPORTED_ELEMENTS = ["block_quote", "codespan", "link", "emphasis", "strong"]
+
+
 @dataclass
 class Heading(object):
     type: str = "heading"
@@ -310,19 +315,27 @@ def parse(self, text):
                 buffer = []
                 continue
 
-            if obj["type"] == "paragraph":
+            if obj["type"] == "block_quote":
+                warnings.warn(
+                    f"(Slide {sliden + 1}) BlockQuote is not supported"
+                )
+            elif obj["type"] == "paragraph":
                 for child in obj["children"]:
                     try:
                         if child["type"] == "image" and child["alt"] == "codio":
                             with open(child["src"], "r") as f:
                                 codio = yaml.load(f, Loader=yaml.Loader)
                             buffer.append(Codio(obj=codio))
+                        elif child["type"] == "codespan":
+                            pass
+                        elif child["type"] == "link":
+                            pass
                         else:
                             element_name = child["type"].title().replace("_", "")
                             Element = eval(element_name)
                             buffer.append(Element(obj=child))
                     except NameError:
-                        raise ValueError(
+                        warnings.warn(
                             f"(Slide {sliden + 1}) {element_name} is not supported"
                         )
             else:
@@ -330,7 +343,7 @@ def parse(self, text):
                     element_name = obj["type"].title().replace("_", "")
                     Element = eval(element_name)
                 except NameError:
-                    raise ValueError(
+                    warnings.warn(
                         f"(Slide {sliden + 1}) {element_name} is not supported"
                     )
                 buffer.append(Element(obj=obj))
diff --git a/present/slideshow.py b/present/slideshow.py
index 20c739b..e705c20 100644
--- a/present/slideshow.py
+++ b/present/slideshow.py
@@ -4,8 +4,8 @@
 
 from asciimatics.scene import Scene
 from asciimatics.effects import Print
-from asciimatics.screen import Screen
 from asciimatics.event import KeyboardEvent
+from asciimatics.screen import Screen, _CursesScreen
 from asciimatics.exceptions import ResizeScreenError, StopApplication
 
 from .effects import (
@@ -88,6 +88,14 @@ def __init__(self, slides):
 
     def __enter__(self):
         self.screen = Screen.open()
+
+        if isinstance(self.screen, _CursesScreen):
+            import curses
+
+            self.screen.A_ITALIC = 5
+            self.screen._a_italic = curses.tigetstr("sitm").decode("utf-8")
+            self.screen._ATTRIBUTES[self.screen.A_ITALIC] = self.screen._a_italic
+
         return self
 
     def __exit__(self, type, value, traceback):