trying to fix

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+
+         
+         <p>In my dotfiles I have a script for performing a live theme switch across
+my entire custom desktop session, built around BSPWM.</p>
+
+<p>As of <a href="https://gitlab.com/protesilaos/dotfiles/commit/9ee6a04755a2b40e0ef6b65509a98e5b6671467c">commit
+9ee6a04</a>,
+the theme switch also affects Emacs, though it was originally designed
+for Vim, Tmux, and other tools.  It uses the <code>emacsclient -e</code> facility
+to run an elisp function of mine that toggles between my two
+Emacs-specific themes (the “Modus themes”).</p>
+
+<p>Here is the essential code part (with <code>_depcheck</code> just being a function
+that checks for the presence of the binary by leveraging <code>command -v</code>):</p>
+
+<pre><code>_emacs() {
+    _depcheck emacs
+
+    pgrep -x emacs &gt; /dev/null || return 1
+
+    emacsclient -e "(prot/modus-themes-toggle)"
+}
+</code></pre>
+
+<p>The commit message is rather comprehensive, so I am quoting it in its
+entirety:</p>
+
+<pre><code>Add Emacs theme switch to the T.E.M.P.U.S. script
+
+I just need to provide some background information on this, in order to
+avoid confusion.
+
+Tempus themes (Vim, terminals, GTK editors)
+-------------------------------------------
+
+The Tempus themes project covers Vim, terminal emulators, and some GTK
+text editors (including GNOME Builder).  Its overarching objective is
+that of a minimum contrast ration of 4.5:1 (WCAG AA) between the
+background and foreground values.  Other tools like Tmux and Dunst all
+make use of its colour values.
+
+Because of their roots in terminal emulators, the Tempus themes use the
+16-colour palette you find on such tools.  Refer to the portal page for
+more on the matter.[1] The project is in a stable state.
+
+Modus themes ("just" GNU Emacs)
+-------------------------------
+
+Whereas the Modus themes are designed specifically for Emacs.  They are
+much more complex and consist of a wider colour palette that covers the
+extensive array of interfaces inside of Emacs.  Their principal
+objective is similar to that of the afore-mentioned project: a minimum
+contrast ratio of 7:1 (WCAG AAA).
+
+Some items in the Tempus themes collection also conform with this higher
+standard, but the project as a whole only guarantees the "AA" score.
+
+Check the git source of the Modus themes.[2] They are under heavy
+development.
+
+Project history
+---------------
+
+The Tempus themes came first (2017) and are a core part of my custom
+desktop session since its early days.  Every relevant interface was
+built around them.
+
+As of commit ec885d1 I am in the process of gradually incorporating my
+new Emacs setup in my dotfiles.[3]  This means lots and lots of breaking
+changes and necessary adjustments.
+
+FEAR NOT: my free/libre book "Prot's Dots For Debian" (PDFD) still
+works,[4] because it uses a snapshot of my dotfiles that contains code
+before the commit I just referenced.[5] PDFD guides you through the
+process of reproducing my custom desktop session on Debian 10 'buster'.
+I recently updated it by adding an Annex on the topic of multi-monitor
+support in BSPWM (and there have been other minor updates since its
+official release in early July 2019).
+
+The T.E.M.P.U.S. script (tempus)
+--------------------------------
+
+Now the part that may cause confusion: the TEMPUS script performs a live
+theme switch across my entire custom desktop session.  In the past, this
+meant using one of the items in the Tempus themes collection to apply
+the new colour values.  I thus gave the script a funny and convenient
+backronym: Themes Every Meticulous Person Ultimately Seeks (TEMPUS).
+
+Recall that the word "tempus" is Latin for "time" because the first
+items of the collection were named after the four seasons:
+
++ tempus autumn
++ tempus spring
++ tempus summer
++ tempus winter
+
+At any rate, and jokes notwithstanding, the backronym had the technical
+upside of offering a straightforward syntax for performing a theme
+change via a CLI prompt: you just had to type `tempus' followed by the
+unique identifier of an item from the Tempus themes collection.  For
+example, to switch to Tempus winter, you would run `tempus winter'.
+
+The other benefit was a more consistent naming convention for the
+`dmenu' front-end that offers an interactive medium for selecting an
+item from the collection: `tempusmenu'.
+
+I think that the script's name is okay, because it still uses the themes
+it was originally designed for.  Besides, I have no intention to remove
+support for the Tempus themes.  The project is still relevant.
+
+What I am doing with this commit, is just including a small function
+that performs a "theme switch" for yet another component of my custom
+desktop session: Emacs.  The fact that Emacs internally uses another
+project of mine (the Modus themes) should not really matter.  The
+end-user effect is exactly the same as before.
+
+I am just writing all this to make things clear and to refer to the
+present commit in case someone asks.
+
+[1]: https://gitlab.com/protesilaos/tempus-themes
+[2]: https://gitlab.com/protesilaos/modus-themes
+[3]: https://protesilaos.com/emacs/dotemacs
+[4]: https://protesilaos.com/pdfd
+[5]: https://gitlab.com/protesilaos/dotfiles
+</code></pre>
+        
+