Function to replace sequential numbers

Hello Excel Geniuses, I'm looking for a UDF that can allow me to select a range of cells that have sequential values, and replace the all but the top and bottom values with a dash. If there is a blank cell somewhere, the space between would be replaced by a comma. Here's an example of what I'm looking for:

I have tables that look like this. The numbers will always be in order, but won't always be in every cell.

A	B	C	D	E	F	G
1	2		5	6	7
5			6	7	8
3				14

So, let's say I've put the UDF in the last cell in every row. for example, the first one would look like this:

 =SEQUENTIAL(A1:F1)

I'd want to be able to select the cells in each row and it would look something like this:

A	B	C	D	E	F	G
1	2		5	6	7	2,5-7
5		6	7	8	10	5,6-8,10
	3		14			3,14