2 files changed, 15 insertions, 3 deletions

diff --git a/arabluatex.dtx b/arabluatex.dtx
index 685b9d0..18293eb 100644
--- a/arabluatex.dtx
+++ b/arabluatex.dtx
@@ -3357,11 +3357,14 @@ wa-ya.sIru ta.hta 'l-jild-i
   \luadirect{mkarbbreak(\luastringN{#1})}}
 %    \end{macrocode}
 % \end{macro}
-% \begin{macro}{\aemph} Arabic emphasis. Needs to be redefined as well.
+% \begin{macro}{\aemph} Arabic emphasis. Needs to be redefined as
+% well. The function is actually coded in Lua.
 %    \begin{macrocode}
 \AtBeginDocument{\ifdef{\aemph}%
-  {\RenewDocumentCommand{\aemph}{m}{$\overline{\text{#1}}$}}
-  {\NewDocumentCommand{\aemph}{m}{$\overline{\text{#1}}$}}}
+  {\RenewDocumentCommand{\aemph}{m}{%
+      \luadirect{tex.sprint(aemph(\luastringN{#1}))}}}
+  {\NewDocumentCommand{\aemph}{m}{%
+      \luadirect{tex.sprint(aemph(\luastringN{#1}))}}}}
 %    \end{macrocode}
 % \begin{macro}{\SetInputScheme}
 %   \changes{v1.4}{2016/07/05}{\cs{SetInputScheme} may be used to
diff --git a/arabluatex.lua b/arabluatex.lua
index 48e5987..f6890ed 100644
--- a/arabluatex.lua
+++ b/arabluatex.lua
@@ -719,3 +719,12 @@ function abraces(str)
    end
    return str
 end
+
+function aemph(str)
+   if tex.textdir == "TRT" then
+      str = "$\\overline{\\text{"..str.."}}$"
+   elseif tex.textdir == "TLT" then
+      str = "$\\underline{\\text{"..str.."}}$"
+   end
+   return str
+end