Install yasnippet and vala-snippets packages

elpa/yasnippet-20160924.2001/snippets/emacs-lisp-mode/x-file.read-lines

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+#contributor: Xah Lee (XahLee.org)
+#name: read lines of a file
+# key: x-file
+# --
+(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")
+)