Chris Green 9b51fb09f1 Support VISUAL environment variable for editing. (#10898) ... If the user has set the environment variable VISUAL, it will be used in preference to EDITOR for all Spack editing activities. If VISUAL is not set or fails (perhaps due to a lack of graphical editing capabilities),EDITOR will be used instead. We fall back to one of several common editors if neither bears fruit. This feature has been tailored to: * Provide identical behavior to the previous implementation in the case that VISUAL is not set. * Not require any change to code utilizing the editor feature. * Follow usual UNIX behavior concerning VISUAL and EDITOR.		2019-03-14 16:16:26 -05:00
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spack	Support VISUAL environment variable for editing. (#10898)	2019-03-14 16:16:26 -05:00