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diff --git a/users/wpcarro/emacs/.emacs.d/wpc/constants.el b/users/wpcarro/emacs/.emacs.d/wpc/constants.el
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+;;; constants.el --- Constants for organizing my Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; This file contains constants that are shared across my configuration.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'f)
+(require 'maybe)
+
+(prelude-assert (f-exists? (getenv "BRIEFCASE")))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst constants-ci?
+  (maybe-some? (getenv "CI"))
+  "Encoded as t when Emacs is running in CI.")
+
+(defconst constants-briefcase
+  (getenv "BRIEFCASE")
+  "Path to my monorepo, which various parts of my configuration rely on.")
+
+;; TODO: Consider merging `ui.el' and `misc.el' because those are the only
+;; current consumers of these constants, and I'm unsure if the indirection that
+;; globally defined constants introduces is worth it.
+
+(defconst constants-current-project
+  constants-briefcase
+  "Variable holding the directory for my currently active project.")
+
+(defconst constants-mouse-kbds
+  '([mouse-1] [down-mouse-1] [drag-mouse-1] [double-mouse-1] [triple-mouse-1]
+    [mouse-2] [down-mouse-2] [drag-mouse-2] [double-mouse-2] [triple-mouse-2]
+    [mouse-3] [down-mouse-3] [drag-mouse-3] [double-mouse-3] [triple-mouse-3]
+    [mouse-4] [down-mouse-4] [drag-mouse-4] [double-mouse-4] [triple-mouse-4]
+    [mouse-5] [down-mouse-5] [drag-mouse-5] [double-mouse-5] [triple-mouse-5])
+  "All of the mouse-related keybindings that Emacs recognizes.")
+
+(defconst constants-fill-column 80
+  "Variable used to set the defaults for wrapping, highlighting, etc.")
+
+(provide 'constants)
+;;; constants.el ends here