succd: log pressures in error messages

succbone/succd/scientific.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"html/template"
 	"strconv"
 )
 
@@ -16,8 +17,25 @@ func (s *ScientificNotationValue) UnmarshalText(text []byte) error {
 	return nil
 }
 
-func (s *ScientificNotationValue) MarshalText() ([]byte, error) {
-	v := float64(*s)
+// formatMbarHTML formats a millibar value using scientific notation and returns
+// a HTML fragment (for superscript support).
+func formatMbarHTML(v float32) template.HTML {
+	exp := 0
+	for v < 1 {
+		v *= 10
+		exp -= 1
+	}
+	for v >= 10 {
+		v /= 10
+		exp += 1
+	}
+	res := fmt.Sprintf("%.3f", v)
+	res += fmt.Sprintf(" x 10<sup>%d</sup>", exp)
+	res += " mbar"
+	return template.HTML(res)
+}
+
+func formatMbar(v float32) string {
 	exp := 0
 	for v < 1 {
 		v *= 10
@@ -29,5 +47,11 @@ func (s *ScientificNotationValue) MarshalText() ([]byte, error) {
 	}
 	res := fmt.Sprintf("%.3f", v)
 	res += fmt.Sprintf("e%d", exp)
+	return res
+}
+
+func (s *ScientificNotationValue) MarshalText() ([]byte, error) {
+	v := float32(*s)
+	res := formatMbar(v)
 	return []byte(res), nil
 }