To install this package, run in Emacs:
M-x package-install RET darkroom RET
The main entrypoints to this extension are two minor modes: M-x darkroom-mode M-x darkroom-tentative-mode `darkroom-mode' makes visual distractions disappear: the mode-line is temporarily elided, text is enlarged and margins are adjusted so that it's centered on the window. `darkroom-tentative-mode' is similar, but it doesn't immediately turn-on `darkroom-mode', unless the current buffer lives in the sole window of the Emacs frame (i.e. all other windows are deleted). Whenever the frame is split to display more windows and more buffers, the buffer exits `darkroom-mode'. Whenever they are deleted, the buffer re-enters `darkroom-mode'. Personally, I always use `darkroom-tentative-mode'. See also the customization options `darkroom-margins' and `darkroom-fringes-outside-margins', which affect both modes.