[add] option omit-zero-exponent

src/num.typ

@@ -107,6 +107,9 @@
       info.e = none
     }
   }
+  if info.e in (0, "0") and it.omit-zero-exponent {
+    info.e = none
+  }
 
   /// Round number and uncertainty
   if it.round.precision != none {

src/state.typ

@@ -3,6 +3,7 @@
   digits: auto,
   decimal-separator: ".",
   omit-unity-mantissa: false,
+  omit-zero-exponent: false,
   uncertainty-mode: "separate",
   positive-sign: false,
   tight: false,

tests/num/omit-zero-exponent/.gitignore

@@ -0,0 +1,5 @@
+# generated by tytanic, do not edit
+
+/diff/
+/out/
+/ref/

tests/num/omit-zero-exponent/ref.typ

@@ -0,0 +1,16 @@
+#set page(width: auto, height: auto, margin: .5em)
+
+
+$2.1×10^1$ \
+$1.23×10^0$ \
+$21×10^0$ \
+$21×10^0$ \
+$21$ \
+
+#pagebreak()
+
+$2.1×10^1$ \
+$1.23$ \
+$21$ \
+$21$ \
+$21$ \

tests/num/omit-zero-exponent/test.typ

@@ -0,0 +1,19 @@
+#import "/src/zero.typ": *
+#set page(width: auto, height: auto, margin: .5em)
+
+#num(exponent: "sci")[21e0] \ 
+#num(exponent: "sci")[1.23e0] \ 
+#num(exponent: (fixed: 0))[21e0] \ 
+#num()[21e0] \ 
+#num()[21] \ 
+
+#pagebreak()
+
+
+#set-num(omit-zero-exponent: true)
+
+#num(exponent: "sci")[21e0] \ 
+#num(exponent: "sci")[1.23e0] \ 
+#num(exponent: (fixed: 0))[21e0] \ 
+#num()[21e0] \ 
+#num()[21] \