spacemacs buffer-encoding-abbrev with signature(BOM)

buffer-encoding-abbrev.el

(spaceline-define-segment buffer-encoding-abbrev
  "The line ending convention used in the buffer."
  (let ((buf-coding (format "%s" buffer-file-coding-system)))
    (list (replace-regexp-in-string "-with-signature\\|-unix\\|-dos\\|-mac" "" buf-coding)
          (concat (and (string-match "with-signature" buf-coding) "ⓑ")
                  (and (string-match "unix"           buf-coding) "ⓤ")
                  (and (string-match "dos"            buf-coding) "ⓓ")
                  (and (string-match "mac"            buf-coding) "ⓜ")
                  )))
  :separator " ")