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I am on a serious quest to replace all my proprietary editors with emacs. So to start with I am using it instead of Sublime when coding Ruby. I also have started some preliminary investigations into using it for java development also. More on that in later posts I hope.

One thing I like in Sublime is how you easily get completions from you current file. Turns out there is a built in thing in emacs called dabbrev that does the same thing. It expands on M-/ by default. / is not the nicest character on a swedish keyboard so I bound M-RET (or Alt-Enter as it is called in IntelliJ) to dabbrev by putting this line into my .emacs file.

(global-set-key (kbd "M-RET") 'dabbrev-expand)

In general I find that it may be hard to find emacs documentation for what you are looking for. On the other hand there is emacs.stackexchange.com so anything is solvable with the help of community.