Use math-preview again

README.org

@@ -1492,26 +1492,58 @@ LaTeX =BiBTeX= dialect for backwards compatibility.  Listing
                             LaTeX-section-label))))
 #+end_src
 
-*** [[https://gitlab.com/matsievskiysv/math-preview/-/blob/master/README.md][Math-preview]]                                                   :noexport:
+*** [[https://gitlab.com/matsievskiysv/math-preview/-/blob/master/README.md][Math-preview]]
 :PROPERTIES:
 :CUSTOM_ID: sec:math-preview
-:header-args:emacs-lisp: :tangle no
 :END:
 
+[[https://gitlab.com/matsievskiysv/math-preview/-/blob/master/README.md][Math-preview]] uses [[https://docs.mathjax.org/en/latest/][Mathjax-3]] to display [[https://www.latex-project.org/][LaTeX]], [[https://www.w3.org/Math/][MathML]],and [[http://asciimath.org/][asciimath]] in Emacs
+buffers with help of an external [[https://nodejs.org][node.js]] program.
+
 #+caption[Configure =math-preview=]:
 #+caption: Configure =math-preview=.
 #+name: lst:configure-math-preview
 #+begin_src emacs-lisp
   (when (ensure-package-installation 'math-preview)
     (with-eval-after-load 'math-preview
+      ;; https://docs.mathjax.org/en/latest/input/tex/extensions/physics.html
+      (let ((physics (split-string "
+  abs absolutevalue acomm acos acosecant acosine acot acotangent
+  acsc admat anticommutator antidiagonalmatrix arccos arccosecant
+  arccosine arccot arccotangent arccsc arcsec arcsecant arcsin
+  arcsine arctan arctangent asec asecant asin asine atan atangent
+  bmqty bqty Bqty bra braket comm commutator cos cosecant cosh
+  cosine cot cotangent coth cp cross crossproduct csc csch curl dd
+  derivative det determinant diagonalmatrix diffd differential div
+  divergence dmat dotproduct dv dyad erf ev eval evaluated exp
+  expectationvalue exponential expval fderivative fdv flatfrac
+  functionalderivative grad gradient gradientnabla hypcosecant
+  hypcosine hypcotangent hypsecant hypsine hyptangent
+  identitymatrix Im imaginary imat innerproduct ip ket ketbra
+  laplacian ln log logarithm matrixdeterminant matrixel
+  matrixelement matrixquantity mdet mel mqty naturallogarithm norm
+  op order outerproduct partialderivative paulimatrix pb
+  pderivative pdv pmat pmqty Pmqty poissonbracket pqty Pr
+  principalvalue Probability pv PV qall qand qas qassume qc qcc
+  qcomma qelse qeven qfor qgiven qif qin qinteger qlet qodd qor
+  qotherwise qq qqtext qsince qthen qty quantity qunless qusing
+  rank Re real Res Residue sbmqty sec secant sech sin sine sinh
+  smallmatrixquantity smdet smqty spmqty sPmqty svmqty tan tangent
+  tanh tr Tr trace Trace va var variation vb vdot vectorarrow
+  vectorbold vectorunit vmqty vnabla vqty vu xmat xmatrix
+  zeromatrix zmat")))
+        (cl-pushnew `("physics" . ,physics)
+                    math-preview-tex-packages-autoload-packages))
+      (setq math-preview-raise 0.5
+            math-preview-scale 1
+            math-preview-tex-default-packages '("autoload" "ams" "physics"))
       (let ((command (executable-find "~/node_modules/.bin/math-preview")))
         (if command
-            (custom-set-variables
-             `(math-preview-command ,command)
-             '(math-preview-raise 0.5)
-             '(math-preview-scale 1))
+            (setq math-preview-command command)
           ;; https://stackoverflow.com/a/17509764 answers:
           ;; How to install an npm package from github directly?
+          (unless (file-directory-p "~/node_modules")
+            (make-directory "~/node_modules"))
           (cl-destructuring-bind (exit-code output)
               (shell-command-with-exit-code
                "npm" "install" "git+https://gitlab.com/matsievskiysv/math-preview.git")