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(require 'yasnippet)
(defun yas-with-comment (str)
(format "%s%s%s" comment-start str comment-end))
;; whitespace removing functions from Magnar Sveen ;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun yas-s-trim-left (s)
"Remove whitespace at the beginning of S."
(if (string-match "\\`[ \t\n\r]+" s)
(replace-match "" t t s)
s))
(defun yas-s-trim-right (s)
"Remove whitespace at the end of S."
(if (string-match "[ \t\n\r]+\\'" s)
(replace-match "" t t s)
s))
(defun yas-s-trim (s)
"Remove whitespace at the beginning and end of S."
(yas-s-trim-left (yas-s-trim-right s)))
(defun yas-string-reverse (str)
"Reverse a string STR manually to be compatible with emacs versions < 25."
(apply #'string
(reverse
(string-to-list str))))
(defun yas-trimmed-comment-start ()
"This function returns `comment-start' trimmed by whitespaces."
(yas-s-trim comment-start))
(defun yas-trimmed-comment-end ()
"This function returns `comment-end' trimmed by whitespaces if `comment-end' is not empty.
Otherwise the reversed output of function `yas-trimmed-comment-start' is returned."
(if (eq (length comment-end) 0)
(yas-string-reverse (yas-trimmed-comment-start))
(yas-s-trim comment-end)))
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