I have file names:

0101-firstpost.md
0117-second.md
0217-third.md
...

Adding a rule to config.yaml:

permalinks:
  posts: "/:filename"

will give them 0101-firstpost permalinks. Changing that rule to /:slug gives a hyphenated "title" from the front matter. I suggest enabling redefinition of :slug placeholder or maybe creating a function that :filename can be piped into.

Related discussion: 43740