setup/nxml.el

   1 (defvar nxml-where-elements-to-id 3)
   2 (defvar nxml-where-max-elements 6)
   3
   4 (require 'cl)
   5
   6 (defun nxml-where ()
   7   "Display the hierarchy of XML elements the point is on as a path."
   8   (and (eq major-mode 'nxml-mode)
   9            (let (path-to-id path-rest)
  10                  (save-excursion
  11                    (save-restriction
  12                          (widen)
  13                          (while (and (not (bobp))
  14                                                  (condition-case nil (progn (nxml-backward-up-element) t) (error nil)))
  15                            (multiple-value-bind
  16                                    (has-id step)
  17                                    (loop for att in xmltok-attributes
  18                                                  if (string= (xmltok-attribute-local-name att) "id")
  19                                                  return (values t (concat "\"" (xmltok-attribute-value att) "\""))
  20                                                  finally return (values nil (xmltok-start-tag-local-name)))
  21                                  (if (or path-to-id has-id)
  22                                          (setq path-to-id (cons step path-to-id))
  23                                    (setq path-rest (cons step path-rest)))))))
  24                  (let ((path-to-id-len (length path-to-id))
  25                            (path-rest-len (length path-rest)))
  26                    (if (> path-to-id-len nxml-where-elements-to-id)
  27                            (progn
  28                                  (setq path-to-id (nthcdr (- path-to-id-len nxml-where-elements-to-id -1) path-to-id))
  29                                  (setq path-to-id (cons "..." path-to-id))
  30                                  (setq path-to-id-len nxml-where-elements-to-id))
  31                          (setq path-to-id (cons "" path-to-id)))
  32                    (when (> (+ path-to-id-len path-rest-len) nxml-where-max-elements)
  33                          (setq path-rest (nbutlast path-rest (- path-rest-len (- nxml-where-max-elements path-to-id-len) -1)))
  34                          (setq path-rest (nconc path-rest (list "...")))))
  35                  (mapconcat 'identity (nconc path-to-id path-rest) "/"))))
  36
  37 (require 'which-func)
  38
  39 (add-to-list 'which-func-functions 'nxml-where)
  40 (add-to-list 'which-func-modes 'nxml-mode)