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diff --git a/emacs/.emacs.d/wpc/device.el b/emacs/.emacs.d/wpc/device.el
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+;;; device.el --- Physical device information -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Functions for querying device information.
+
+;;; Code:
+
+(require 'dash)
+(require 'alist)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst device/hostname->device
+  '(("zeno.lon.corp.google.com" . work-desktop)
+    ("seneca" . work-laptop))
+  "Mapping hostname to a device symbol.")
+
+;; TODO: Should I generate these predicates?
+
+(defun device/classify ()
+  "Return the device symbol for the current host or nil if not supported."
+  (alist/get system-name device/hostname->device))
+
+(defun device/work-laptop? ()
+  "Return t if current device is work laptop."
+  (equal 'work-laptop
+         (device/classify)))
+
+(defun device/work-desktop? ()
+  "Return t if current device is work desktop."
+  (equal 'work-desktop
+         (device/classify)))
+
+(provide 'device)
+;;; device.el ends here