Update app.py

app.py

@@ -13,10 +13,12 @@ templates = Jinja2Templates(directory="templates")
 @app.get("/",response_class=HTMLResponse)
 def test(request: Request,q:str="ls",body:bool=True):
     with open("./v.tex","w") as k:
-        k.write(format(q))
-    
-    return templates.TemplateResponse("latex.html", 
+        k.write(format(q) if body else q)
+    r=run("pdflatex v.tex".split(" "),capture_output=True).stderr
+    if r.stderr:
+        return r.stderr
+    else:
+        return templates.TemplateResponse("latex.html", 
           {
             "request":request,
-            "result":run(q.split(" "),capture_output=True).stdout.replace(b"\n",b"<br>").decode("utf-8")
-          })
+            "result":r.stdout})