From b63cad270f8bc0c9e88515d6a630ad58a93641b5 Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Sun, 16 Aug 2020 02:38:53 -0400
Subject: [PATCH] uniblock: only emit U+200E when necessary

---
 src/demo/unicodeblocks.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/demo/unicodeblocks.c b/src/demo/unicodeblocks.c
index 7779a14d9..29436b39e 100644
--- a/src/demo/unicodeblocks.c
+++ b/src/demo/unicodeblocks.c
@@ -4,6 +4,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unictype.h>
 #include "demo.h"
 
 // show unicode blocks. a block is always a multiple of 16 codepoints.
@@ -74,9 +75,11 @@ draw_block(struct ncplane* nn, uint32_t blockstart){
         if(wcwidth(w) < 2){
           utf8arr[bwc++] = ' ';
         }
-        utf8arr[bwc++] = 0xe2;
-        utf8arr[bwc++] = 0x80;
-        utf8arr[bwc++] = 0x8e;
+        if(uc_bidi_category(w)){
+          utf8arr[bwc++] = 0xe2;
+          utf8arr[bwc++] = 0x80;
+          utf8arr[bwc++] = 0x8e;
+        }
         utf8arr[bwc++] = '\0';
       }else{ // don't dump non-printing codepoints
         strcpy(utf8arr, "  ");