Monday 28 May 2018

osx snow leopard - Default editor for files without file name extension in Mac OS X


I want to open files without file name extension, including .dotsystemfiles (e.g. .htaccess or .vimrc) with a different editor than TextEdit. Doing the regular Change All... in the Get Info panel won't do the trick as it gives the following error:


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Answer



You need to change the editor for the text/plain mime type or public.plain-text UTI. The regular Get Info dialog changes the association for the file name extension, which these files don't have.




Get RCDefaultApp and install it.


Open System Preferences » Default Apps » Apps. Select your desired default editor, and look for either of the above in the application's list of supported types.


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Select the entry, and click Set as Default. You're done. Both opening from Finder and the command-line open will open your new default editor.




This also changes all .txt files and the like. I don't think this can be prevented, since OS X thinks both these and extension-less files are public.plain-text/text/plain.




To do this without RCDefaultApp, edit Edit ~/Library/Preferences/com.apple.LaunchServices.plist.


Add an entry under LSHandlers, containing the UTI (key LSHandlerContentType, e.g. public.plain-text) and application bundle identifier (LSHandlerRoleAll, e.g. com.macromates.textmate).


It looks like this in Property List Editor:


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