Update

snippets/latex-mode/Fraction auto

@@ -0,0 +1,16 @@
+# key: //
+# name: Fraction auto
+# type: command
+# condition: (and (texmathp) (quote auto))
+# group: math
+# --
+(let ((numerator t))
+  (condition-case nil
+      (save-excursion
+        (backward-sexp)
+        (kill-sexp)
+        (delete-char 1))
+    (error (setq numerator 'nil)))
+  (insert "\\frac{" (if numerator (current-kill 0) "")
+          "}{}")
+  (backward-char (if numerator 1 3)))