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On my Mac, I would like to be able to right-click on a file and then select "open with.." emacs.

How can I accomplish that? (On my Mac, I have emacs in /usr/bin)

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Is Aquamacs not an option for you? – slhck Aug 4 '12 at 11:20
Yes, I have have downloaded it now! – ragnarius Aug 4 '12 at 11:55
up vote 3 down vote accepted

Download the most recent version of Aquamacs which is "standard" Emacs with a lot of essential OS X customization.

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You can also achieve the result you want with an actual terminal window and the command-line emacs. To do that, open from your applications folder, and create a new Application.

Here, from the left, drag Run AppleScript to the right, and paste the following:

on run {input}
    set filepath to quoted form of POSIX path of input
    tell application "Terminal"
        do script "/usr/bin/emacs " & filepath
    end tell
    return input
end run

Save this anywhere you want, as an .app file. Now, you can right-click on any file, go to Open With… » Other and select your new app. You can also go to Get Info after right-clicking, and under Open With…, set your new emacs-app as a default for all files of this type.

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Thanks, this is great to know! – ragnarius Aug 5 '12 at 10:44

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