Support \minuso (#2213)

* Support \minuso

* Update screenshots

* Add MathML version

* Add BIN spacing

* Update screenshots

* Add Unicode character

* Delete duplicate macro

Co-authored-by: Erik Demaine <edemaine@mit.edu>

docs/support_table.md

@@ -669,6 +669,7 @@ use `\ce` instead|
 |\mid|$\{x∈ℝ\mid x>0\}$|`\{x∈ℝ\mid x>0\}`|
 |\middle|$P\left(A\middle\vert B\right)$|`P\left(A\middle\vert B\right)`|
 |\min|$\min$||
+|\minuso|$\minuso$||
 |\mit|<span style="color:firebrick;">Not supported</span>|See `\mathit`|
 |\mkern|$a\mkern18mu b$|`a\mkern18mu b`|
 |\mmlToken|<span style="color:firebrick;">Not supported</span>||

docs/supported.md

@@ -632,9 +632,9 @@ In cases where KaTeX fonts do not have a bold glyph, `\pmb` can simulate one. Fo
 |$\circledR$ `\circledR`|$\diamondsuit$ `\diamondsuit`|$\heartsuit$ `\heartsuit`
 |$\text{\textregistered}$ `\text{\textregistered}`|$\diamonds$ `\diamonds`|$\hearts$ `\hearts`
 |$\circledS$ `\circledS`|$\spadesuit$ `\spadesuit`|$\spades$ `\spades`
-|$\text{\textcircled a}$ `\text{\textcircled a}`|$\maltese$ `\maltese`||
+|$\text{\textcircled a}$ `\text{\textcircled a}`|$\maltese$ `\maltese`|$\minuso$ `\minuso`|
 
-Direct Input: $£ ¥ ∇ ∞ · ∠ ∡ ∢ ♠ ♡ ♢ ♣ ♭ ♮ ♯ ✓ …  ⋮  ⋯  ⋱  !$ ‼
+Direct Input: $£ ¥ ∇ ∞ · ∠ ∡ ∢ ♠ ♡ ♢ ♣ ♭ ♮ ♯ ✓ …  ⋮  ⋯  ⋱  !$ ‼ ⦵
 
 ## Units
 

src/macros.js

@@ -885,6 +885,14 @@ defineMacro("\u2984", "\\rBrace"); // blackboard bold }
 // TODO: Create variable sized versions of the last two items. I believe that
 // will require new font glyphs.
 
+// The stmaryrd function `\minuso` provides a "Plimsoll" symbol that
+// superimposes the characters \circ and \mathminus. Used in chemistry.
+defineMacro("\\minuso", "\\mathbin{\\html@mathml{" +
+    "{\\mathrlap{\\mathchoice{\\kern{0.145em}}{\\kern{0.145em}}" +
+    "{\\kern{0.1015em}}{\\kern{0.0725em}}\\circ}{-}}}" +
+    "{\\char`⦵}}");
+defineMacro("⦵", "\\minuso");
+
 //////////////////////////////////////////////////////////////////////
 // texvc.sty
 

test/katex-spec.js

@@ -3728,6 +3728,10 @@ describe("Symbols", function() {
         expect`A\;B\,C\nobreakspace \text{A\;B\,C\nobreakspace}`.toBuild(strictSettings);
     });
 
+    it("should build \\minuso", () => {
+        expect`\\minuso`.toBuild(strictSettings);
+    });
+
     it("should render ligature commands like their unicode characters", () => {
         expect`\text{\ae\AE\oe\OE\o\O\ss}`.toBuildLike(r`\text{æÆœŒøØß}`, strictSettings);
     });

test/screenshotter/ss_data.yaml

@@ -396,7 +396,7 @@ SvgReset:
     # styles (like fill-opacity) are not inherited
     styles: 'display:block; width:500px;border:solid yellow 5px;padding:50px;background:#ccc;color:green;font-size:92px;transform:translate(100px,250px)rotate(-45deg);fill-opacity:0;stroke-width:40;stroke:blue;'
 Symbols1: |
-    \maltese\degree\pounds\$
+    \maltese\degree\pounds\$\minuso
     \text{\maltese\degree\pounds\textdollar}
 Tag:
     tex: \tag{$+$hi} \frac{x^2}{y}+x^{2^y}