emacs - How to open a *.pdf with Skim using start-process so that it has focus -

could please give me hand open *.pdf using skim has focus. skim opens file correctly, remains in background. i'm using recent version of emacs trunk on osx machine.

if insert "open -a" or "open -o" before absolute path skim, emacs complains there no application name. i've tried placing "-o" after filename, didn't have affect.

the following code wanderlust, assume start-process universal.

(eval-after-load "mime-view"   '(progn      (ctree-set-calist-strictly       'mime-acting-condition       '((mode . "play")         (type . application)(subtype . pdf)         (method . lawlist-mime-view)))))  (defun lawlist-mime-view (&optional b)   (let* ((entity (get-text-property (point) 'mime-view-entity))            (filename (mime-entity-safe-filename entity)))   (mime-write-entity-content entity (concat "/tmp/" filename))   (process-kill-without-query     (start-process "hello-world" nil "/applications/skim.app/contents/macos/skim" filename)))) 

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edit -- 1: here simplistic function diagnosing problem. have created *.pdf file , saved "/tmp/test.pdf".

(defun test-start-process ()   (interactive)     (start-process "hello-world" nil "open" "-a skim" "/tmp/test.pdf")) 

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edit -- 2: here revised working code tungd -- appreciated!

(eval-after-load "mime-view"   '(progn      (ctree-set-calist-strictly       'mime-acting-condition       '((mode . "play")         (type . application)(subtype . pdf)         (method . lawlist-mime-view)))))  (defun lawlist-mime-view (&optional b)   (let* (     (entity (get-text-property (point) 'mime-view-entity))     (name (mime-entity-safe-filename entity))     (filename (concat "/tmp/" name)) )   (mime-write-entity-content entity filename)   (start-process "hello-world" nil "open" "-a" "skim" filename))) 

i think open easiest way. definition of start-process is:

(start-process name buffer program &rest program-args) 

so have use so:

(start-process "hello-world" nil "open" "-a" "skim" filename)