Added some snippets for elisp-mode from Xah Lee.

snippets/text-mode/emacs-lisp-mode/.read_me

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+TITLE: Emacs Idiom Template Set. Version 1. 2009-02-22
+
+DESCRIPTION: Some useful templates for emacs lisp. This template set is based on useful elisp idioms on common tasks.
+
+LICENSING: GPL version 3.
+
+AUTHOR: Xah Lee
+
+Home Page: latest version at:
+• Emacs Lisp Idiom Templates
+ http://xahlee.org/emacs/elisp_idiom_templates.html

snippets/text-mode/emacs-lisp-mode/defun

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+#name : function template
+#contributor : Xah Lee
+# --
+(defun $1 ()
+  "thisandthat."
+  (interactive)
+  (let (var1)
+    (setq var1 some)
+    $0
+  )
+)

snippets/text-mode/emacs-lisp-mode/dired.process_marked

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+#name : process marked files in dired
+#contributor : Xah Lee
+# --
+;; idiom for processing a list of files in dired's marked files
+ 
+;; suppose myProcessFile is your function that takes a file path
+;; and do some processing on the file
+
+(defun dired-myProcessFile ()
+  "apply myProcessFile function to marked files in dired."
+  (interactive)
+  (require 'dired)
+  (mapc 'myProcessFile (dired-get-marked-files))
+)
+
+;; to use it, type M-x dired-myProcessFile

snippets/text-mode/emacs-lisp-mode/file.process

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+#name : a function that process a file
+#contributor : Xah Lee
+# --
+(defun doThisFile (fpath)
+  "Process the file at path FPATH ..."
+  (let ()
+    ;; create temp buffer without undo record or font lock. (more efficient)
+    ;; first space in temp buff name is necessary
+    (set-buffer (get-buffer-create " myTemp"))
+    (insert-file-contents fpath nil nil nil t)
+
+    ;; process it ...
+    ;; (goto-char 0) ; move to begining of file's content (in case it was open)
+    ;; ... do something here
+    ;; (write-file fpath) ;; write back to the file
+
+    (kill-buffer " myTemp")))

snippets/text-mode/emacs-lisp-mode/file.read-lines

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+#name : read lines of a file
+#contributor : Xah Lee
+# --
+(defun read-lines (filePath)
+  "Return a list of lines in FILEPATH."
+  (with-temp-buffer
+    (insert-file-contents filePath)
+    (split-string
+     (buffer-string) "\n" t)) )
+
+;; process all lines
+(mapc 
+ (lambda (aLine) 
+   (message aLine) ; do your stuff here
+   )
+ (read-lines "inputFilePath")
+)

snippets/text-mode/emacs-lisp-mode/find-replace

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+#name : find and replace on region
+#contributor : Xah Lee
+# --
+(defun replace-html-chars-region (start end)
+  "Replace “<” to “&lt;” and other chars in HTML.
+This works on the current region."
+  (interactive "r")
+  (save-restriction 
+    (narrow-to-region start end)
+    (goto-char (point-min))
+    (while (search-forward "&" nil t) (replace-match "&amp;" nil t))
+    (goto-char (point-min))
+    (while (search-forward "<" nil t) (replace-match "&lt;" nil t))
+    (goto-char (point-min))
+    (while (search-forward ">" nil t) (replace-match "&gt;" nil t))
+    )
+  )

snippets/text-mode/emacs-lisp-mode/grabstring

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+#name : grab buffer substring
+#contributor : Xah Lee
+# --
+(setq $0 (buffer-substring-no-properties myStartPos myEndPos))

snippets/text-mode/emacs-lisp-mode/grabthing

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+#name : grab word under cursor
+#contributor : Xah Lee
+# --
+(setq $0 (thing-at-point 'symbol))

snippets/text-mode/emacs-lisp-mode/traverse_dir

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+#name : traversing a directory
+#contributor : Xah Lee
+# --
+;; apply a function to all files in a dir
+(require 'find-lisp)
+(mapc 'my-process-file (find-lisp-find-files "~/myweb/" "\\.html$"))

snippets/text-mode/emacs-lisp-mode/word-or-region

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+#name : Command that works on region or word
+#contributor : Xah Lee
+# --
+;; example of a command that works on current word or text selection
+(defun down-case-word-or-region ()
+  "Lower case the current word or text selection."
+(interactive)
+(let (pos1 pos2 meat)
+  (if (and transient-mark-mode mark-active)
+      (setq pos1 (region-beginning)
+            pos2 (region-end))
+    (setq pos1 (car (bounds-of-thing-at-point 'symbol))
+          pos2 (cdr (bounds-of-thing-at-point 'symbol))))
+
+  ; now, pos1 and pos2 are the starting and ending positions
+  ; of the current word, or current text selection if exists
+
+  ;; put your code here.
+  $0
+  ;; Some example of things you might want to do
+  (downcase-region pos1 pos2) ; example of a func that takes region as args
+  (setq meat (buffer-substring-no-properties pos1 pos2)) ; grab the text.
+  (delete-region pos1 pos2) ; get rid of it
+  (insert "newText") ; insert your new text
+
+  )
+)