Prevent Blackfriday/smartParens from running inside equations

Fixes https://github.com/kaushalmodi/ox-hugo/issues/104

ox-blackfriday.el

@@ -375,7 +375,13 @@ INFO is a plist holding contextual information."
              ;; Need to escape the backslash in "\(", "\)", .. to
              ;; make Blackfriday happy. So \( -> \\(, \) -> \\),
              ;; \[ -> \\[ and \] -> \\].
-             (frag (replace-regexp-in-string "\\(\\\\[]()[]\\)" "\\\\\\1" frag)))
+             (frag (replace-regexp-in-string "\\(\\\\[]()[]\\)" "\\\\\\1" frag))
+             ;; Insert an extra space to trick Blackfriday/smartParens
+             ;; from activating inside equations.  That extra space
+             ;; anyways doesn't matter in equations.
+             ;; https://github.com/kaushalmodi/ox-hugo/issues/104
+             ;; (c) -> ( c), (r) -> ( r), (tm) -> ( tm)
+             (frag (replace-regexp-in-string "(\\(c\\|r\\|tm\\))" "( \\1)" frag)))
         frag))
      ((assq processing-type org-preview-latex-process-alist)
       (let ((formula-link

test/site/content-org/all-posts.org

@@ -1781,6 +1781,34 @@ If $a^2=b$ and \( b=2 \), then the solution must be either
 $$ a=+\sqrt{2} $$ or \[ a=-\sqrt{2} \]
 
 (Note that the last two equations show up on their own lines.)
+** Equations with (r), (c), ..                                     :@upstream:
+:PROPERTIES:
+:EXPORT_FILE_NAME: equations-with-r-c
+:END:
+{{{oxhugoissue(104)}}}
+
+Below, =(r)= or =(R)= should not get converted to ®, =(c)= or
+=(C)= should not get converted to ©, and =(tm)= or =(TM)= should
+not get converted to ™:
+
+- $(r)$ $(R)$
+- $(c)$ $(C)$
+- $(tm)$ $(TM)$
+
+
+- \( (r) \) \( (R) \)
+- \( (c) \) \( (C) \)
+- \( (tm) \) \( (TM) \)
+
+Same as above but in /Block Math equations/:
+
+$$ (r) (R) $$
+$$ (c) (C) $$
+$$ (tm) (TM) $$
+
+\[ (r) (R) \]
+\[ (c) (C) \]
+\[ (tm) (TM) \]
 * Lists                                                               :lists:
 ** List following a list
 :PROPERTIES:
@@ -2626,7 +2654,7 @@ auto-prefixed with the section for the current post.
 *** Multifractal definition
 - Consider a given object $\Omega$, its multifractal nature is
   practically determined by covering the system with a set of boxes
-  $\{B_i(r)\}$ with $(i=1,..., N(r))$ of side lenght $r$
+  $\{B_i(r)\}$ with $(i=1,..., N(r))$ of side length $r$
 - These boxes are nonoverlaping and such that
 
   $$\Omega = \bigcup_{i=1}^{N(r)} B_i(r)$$

test/site/content/posts/equations-with-r-c.md

@@ -0,0 +1,32 @@
++++
+title = "Equations with (r), (c), .."
+tags = ["equations"]
+categories = ["upstream"]
+draft = false
++++
+
+`ox-hugo` Issue #[104](https://github.com/kaushalmodi/ox-hugo/issues/104)
+
+Below, `(r)` or `(R)` should not get converted to ®, `(c)` or
+`(C)` should not get converted to ©, and `(tm)` or `(TM)` should
+not get converted to ™:
+
+-   \\(( r)\\) \\(( R)\\)
+-   \\(( c)\\) \\(( C)\\)
+-   \\(( tm)\\) \\(( TM)\\)
+
+<!--listend-->
+
+-   \\( ( r) \\) \\( ( R) \\)
+-   \\( ( c) \\) \\( ( C) \\)
+-   \\( ( tm) \\) \\( ( TM) \\)
+
+Same as above but in _Block Math equations_:
+
+\\[ ( r) ( R) \\]
+\\[ ( c) ( C) \\]
+\\[ ( tm) ( TM) \\]
+
+\\[ ( r) ( R) \\]
+\\[ ( c) ( C) \\]
+\\[ ( tm) ( TM) \\]

test/site/content/real-examples/multifractals-in-ecology-using-r.md

@@ -28,10 +28,10 @@ source = "https://github.com/lsaravia/MultifractalsInR/blob/master/Curso3.md"
 
 -   Consider a given object \\(\Omega\\), its multifractal nature is
     practically determined by covering the system with a set of boxes
-    \\(\{B\_i(r)\}\\) with \\((i=1,..., N(r))\\) of side lenght \\(r\\)
+    \\(\{B\_i( r)\}\\) with \\((i=1,..., N( r))\\) of side length \\(r\\)
 -   These boxes are nonoverlaping and such that
 
-    \\[\Omega = \bigcup\_{i=1}^{N(r)} B\_i(r)\\]
+    \\[\Omega = \bigcup\_{i=1}^{N( r)} B\_i( r)\\]
 
     This is the box-counting method but now a measure \\(\mu(B\_n)\\) for each
     box is computed. This measure corresponds to the total population or
@@ -51,16 +51,16 @@ source = "https://github.com/lsaravia/MultifractalsInR/blob/master/Curso3.md"
     infinite spectrum of so-called correlation dimension of order \\(q\\) or
     also called Renyi entropies.
 
-    \\[D\_q = \lim\_{r \to 0} \frac{1}{q-1}\frac{log \left[ \sum\_{i=1}^{N(r)}p\_i^q \right]}{\log r}\\]
+    \\[D\_q = \lim\_{r \to 0} \frac{1}{q-1}\frac{log \left[ \sum\_{i=1}^{N( r)}p\_i^q \right]}{\log r}\\]
 
     where \\(p\_i=\mu(B\_i)\\) and a normalization is assumed:
 
-    \\[\sum\_{i=1}^{N(r)}p\_i=1\\]
+    \\[\sum\_{i=1}^{N( r)}p\_i=1\\]
 
 -   For \\(q=0\\) we have the familiar definition of fractal dimension. To see
     this we replace \\(q=0\\)
 
-    \\[D\_0 = -\lim\_{r \to 0}\frac{N(r)}{\log r}\\]
+    \\[D\_0 = -\lim\_{r \to 0}\frac{N( r)}{\log r}\\]
 
 
 ## Generalized dimensions 1 {#generalized-dimensions-1}
@@ -69,7 +69,7 @@ source = "https://github.com/lsaravia/MultifractalsInR/blob/master/Curso3.md"
     \\(q' \geq q\\)
 -   The sum
 
-    \\[M\_q(r) = \sum\_{i=1}^{N(r)}[\mu(B\_i(r))]^q = \sum\_{i=1}^{N(r)}p\_i^q\\]
+    \\[M\_q( r) = \sum\_{i=1}^{N( r)}[\mu(B\_i( r))]^q = \sum\_{i=1}^{N( r)}p\_i^q\\]
 
     is the so-called moment or partition function of order \\(q\\).
 -   Varying q allows to measure the non-homogeneity of the pattern. The
@@ -94,11 +94,11 @@ source = "https://github.com/lsaravia/MultifractalsInR/blob/master/Curso3.md"
     the Shannon entropy or also called by ecologist the Shannon's index of
     diversity.
 
-    \\[D\_1 = -\lim\_{r \to 0}\sum\_{i=1}^{N(r)} p\_i \log p\_i\\]
+    \\[D\_1 = -\lim\_{r \to 0}\sum\_{i=1}^{N( r)} p\_i \log p\_i\\]
 
     and the second is the so-called correlation dimension:
 
-    \\[D\_2 = -\lim\_{r \to 0} \frac{\log \left[ \sum\_{i=1}^{N(r)} p\_i^2 \right]}{\log r} \\]
+    \\[D\_2 = -\lim\_{r \to 0} \frac{\log \left[ \sum\_{i=1}^{N( r)} p\_i^2 \right]}{\log r} \\]
 
     the numerator is the log of the Simpson index.
 
@@ -125,7 +125,7 @@ source = "https://github.com/lsaravia/MultifractalsInR/blob/master/Curso3.md"
 -   The same information contained in the generalized dimensions can be
     expressed using mass exponents:
 
-    \\[M\_q(r) \propto r^{-\tau\_q}\\]
+    \\[M\_q( r) \propto r^{-\tau\_q}\\]
 
     This is the scaling of the partition function. For monofractals
     \\(\tau\_q\\) is linear and related to the Hurst exponent: