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* tsukundere/math.scm (anchor->procedure): New exported variable.
* tsukundere/textures.scm (render-texture): Implement in term of

* tsukundere/math.scm (modulo/length): New exported variable.

Fixes #10.

* tsukundere/math.scm: (anchor:top-left, anchor:center)
(anchor:bottom-left): New variables.
* tsukundere/textures.scm (%render-texture): Take pos and dim as
arrays.
(render-texture): Take anchor procedure.  Resolve symbols using
new definitions.

Use 3-way <=.

* tsukundere/game.scm (sdl-func, sdl-get-window-minimum-size)
(sdl-set-window-minimum-size, sdl-set-window-resizable)
(sdl-render-set-viewport, sdl-render-set-scale)
(window-minimum-size, set-window-minimum-size!)
(set-window-resizable!, render-set-scale, render-set-viewport): Move
from here ...
* tsukundere/game/magic.scm: ... to here.
* Makefile.am (nobase_dist_guilesource_DATA): Adjust accordingly.

* doc/tsukundere.texi (Preferences): New section.
* tsukundere/preferences.scm (add-preference-hook!): Document it.

* tsukundere/preferences.scm (make-preference): Synchronize preference
hook accessors for var and proc.
(add-preference-hook!): New variable.
* tsukundere/game.scm (*fullscreen?*): New variable.
Add hook to set current window to fullscreen when it's changed.
(key-press): Set fullscreen preference instead of toggling fullscreen
directly.
(run-game): Remove fullscreen? argument.
Sanitize game name.
Save game preferences upon exiting.
* examples/events.scm: Clear game-name to disable saving.
* examples/scaling-rects.scm: Make game-name super duper unique.
Remove fullscreen? argument.

* tsukundere/utils.scm (xdg-config-dir, tsukundere-config-dir)
(tsukundere-config-file): New variables.
* tsukundere/preferences.scm: New file.
* Makefile.am (nobase_dist_guilesource_DATA): Add it here.
* tsukundere/text.scm (*text-speed*): Implemented as preference.
* tsukundere/game.scm (run-game): Load preferences on startup.

* tsukundere/script/utils.scm (input): Do not use negative index
when pressing backspace on empty input.

Not the commit we deserve, but the one we need...

* tsukundere/game.scm (sdl-get-window-minimum-size):
(window-minimum-size): New auxiliary variables.
(sdl-set-window-minimum-size, sdl-set-window-resizable): Fix return
type.
(set-window-minimum-size!, set-window-resizable!): Do not throw error.
(render-set-scale): Simplify to 1D.
(*window-fitter*): Removed variable.
(fit-current-window!): New variable, replaces *window-fitter*.
Also enforce size request.
(run-game, event-handler): Adjust accordingly.

* tsukundere/game.scm (sdl-set-window-minimum-size)
(sdl-set-window-resizable, sdl-render-set-viewport)
(sdl-render-set-scale, set-window-resizable!)
(set-window-minimum-size!, render-set-scale)
(render-set-viewport): New auxiliary variables, to be upstreamed
in Guile-SDL2 proper.
(key-press): Toggle fullscreen when F11 is pressed.
(window-fullscreen?, toggle-window-fullscreen!)
(render/window-fitter, *window-fitter*): New variables.
(event-handler): Trigger window fitter on resize events.
(run-game): Add fullscreen? argument.
Initialize window fitter.
Implement full-screen toggling in terms of toggle-window-fullscreen!.
Enable window manager scaling based on support for minimum size
setting.
Hide window until renderer is created.
* examples/scaling-rects.scm: New file.

* tsukundere/history.scm (%save): Ensure (dirname file) exists.

Fixes #1.