Emacs: Details comments on Eshell, Helm and PDF issues

.emacs.d/init.el

@@ -237,6 +237,8 @@
 
 ;;; PDF
 ;;; pdf-tools requires poppler built with cairo support.
+;;; We cannot defer loading as `pdf-tools-install' is required for PDF
+;;; association.
 (nconc package-selected-packages '(pdf-tools))
 (when (require 'pdf-tools nil t)
   (pdf-tools-install t t t))

.emacs.d/lisp/init-eshell.el

@@ -7,6 +7,10 @@
 ;;; (for the first session only) and `eshell-mode-hook'.
 
 ;;; TODO: Redirecting big output to file (e.g. /dev/null) is extremely slow.
+;; > cat /usr/share/dict/british-english | wc -l
+;;; The above line yields rancom results.  Plus it's much slower than
+;; > wc -l /usr/share/dict/british-english
+;;; while it should only cost an additional process to launch.
 
 ;;; REVIEW: Cannot "C-c C-c" during a `sudo pacman -Syu`.  A bug was filed about that already.
 

.emacs.d/lisp/init-evil-helm.el

@@ -1,12 +1,11 @@
 ;;; Evil+Helm
 
-;;; TODO: Make bindings completely evil: <esc> then hjkl should do what is intended.
-;;; Try out and see how convenient that is.
-
 (global-set-key "\M-y" 'helm-show-kill-ring)
 
-;; To navigate helm entries with hjkl, using the C- modifier would conflict
-;; with C-h (help prefix) and C-k (`evil-insert-digraph').  We use M- instead.
+;;; To navigate helm entries with hjkl, using the C- modifier would conflict
+;;; with C-h (help prefix) and C-k (`evil-insert-digraph').  We use M- instead.
+;;; We cannot use normal mode to navigate if we also want to use it to edit the
+;;; minibuffer content.
 (define-keys helm-map
   "C-\\" 'helm-toggle-resplit-and-swap-windows
   "M-\\" 'helm-toggle-resplit-and-swap-windows