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(require 'slime)
(require 'tramp)
(eval-when-compile (require 'cl)) ; lexical-let
(define-slime-contrib slime-tramp
"Filename translations for tramp"
(:authors "Marco Baringer <mb@bese.it>")
(:license "GPL")
(:on-load
(setq slime-to-lisp-filename-function #'slime-tramp-to-lisp-filename)
(setq slime-from-lisp-filename-function #'slime-tramp-from-lisp-filename)))
(defcustom slime-filename-translations nil
"Assoc list of hostnames and filename translation functions.
Each element is of the form (HOSTNAME-REGEXP TO-LISP FROM-LISP).
HOSTNAME-REGEXP is a regexp which is applied to the connection's
slime-machine-instance. If HOSTNAME-REGEXP maches then the
corresponding TO-LISP and FROM-LISP functions will be used to
translate emacs filenames and lisp filenames.
TO-LISP will be passed the filename of an emacs buffer and must
return a string which the underlying lisp understandas as a
pathname. FROM-LISP will be passed a pathname as returned by the
underlying lisp and must return something that emacs will
understand as a filename (this string will be passed to
find-file).
This list will be traversed in order, so multiple matching
regexps are possible.
Example:
Assuming you run emacs locally and connect to slime running on
the machine 'soren' and you can connect with the username
'animaliter':
(push (list \"^soren$\"
(lambda (emacs-filename)
(subseq emacs-filename (length \"/ssh:animaliter@soren:\")))
(lambda (lisp-filename)
(concat \"/ssh:animaliter@soren:\" lisp-filename)))
slime-filename-translations)
See also `slime-create-filename-translator'."
:type '(repeat (list :tag "Host description"
(regexp :tag "Hostname regexp")
(function :tag "To lisp function")
(function :tag "From lisp function")))
:group 'slime-lisp)
(defun slime-find-filename-translators (hostname)
(cond ((cdr (cl-assoc-if (lambda (regexp) (string-match regexp hostname))
slime-filename-translations)))
(t (list #'identity #'identity))))
(defun slime-make-tramp-file-name (username remote-host lisp-filename)
"Tramp compatability function.
Handles the signature of `tramp-make-tramp-file-name' changing
over time."
(cond
((>= emacs-major-version 26)
;; Emacs 26 requires the method to be provided and the signature of
;; `tramp-make-tramp-file-name' has changed.
(tramp-make-tramp-file-name (tramp-find-method nil username remote-host)
username
nil
remote-host
nil
lisp-filename))
((boundp 'tramp-multi-methods)
(tramp-make-tramp-file-name nil nil
username
remote-host
lisp-filename))
(t
(tramp-make-tramp-file-name nil
username
remote-host
lisp-filename))))
(cl-defun slime-create-filename-translator (&key machine-instance
remote-host
username)
"Creates a three element list suitable for push'ing onto
slime-filename-translations which uses Tramp to load files on
hostname using username. MACHINE-INSTANCE is a required
parameter, REMOTE-HOST defaults to MACHINE-INSTANCE and USERNAME
defaults to (user-login-name).
MACHINE-INSTANCE is the value returned by slime-machine-instance,
which is just the value returned by cl:machine-instance on the
remote lisp. REMOTE-HOST is the fully qualified domain name (or
just the IP) of the remote machine. USERNAME is the username we
should login with.
The functions created here expect your tramp-default-method or
tramp-default-method-alist to be setup correctly."
(lexical-let ((remote-host (or remote-host machine-instance))
(username (or username (user-login-name))))
(list (concat "^" machine-instance "$")
(lambda (emacs-filename)
(tramp-file-name-localname
(tramp-dissect-file-name emacs-filename)))
`(lambda (lisp-filename)
(slime-make-tramp-file-name
,username
,remote-host
lisp-filename)))))
(defun slime-tramp-to-lisp-filename (filename)
(funcall (if (slime-connected-p)
(first (slime-find-filename-translators (slime-machine-instance)))
'identity)
(expand-file-name filename)))
(defun slime-tramp-from-lisp-filename (filename)
(funcall (second (slime-find-filename-translators (slime-machine-instance)))
filename))
(provide 'slime-tramp)