Since tidal version 0.8, the offical atom plugin atom-tidalcycles should be used.
tidal is a live-coding pattern language
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Install tidalpackage inatomeditor
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The default ghcipath is in/usr/local/bin/ghci, you can change this in the package setting view.
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running dirt
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Open a .tidalfile, and selectBootin the submenuTidal
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Then, you can: 
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shift+enterto evaluate current line or selection
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cmd+enterto evaluate multi-lines or selection
You can customize if you want, see atom's doc