added CallStackPrintable

format.go

@@ -3,12 +3,19 @@ package errs
 import (
 	"errors"
 	"fmt"
+	"io"
 	"runtime"
 	"strings"
 
 	"github.com/domonda/go-pretty"
 )
 
+// CallStackPrintable can be implemented to customize the printing
+// of the implementation's data in an error call stack output.
+type CallStackPrintable interface {
+	PrintForCallStack(io.Writer)
+}
+
 func formatError(err error) string {
 	var (
 		firstWithoutStack error
@@ -70,17 +77,25 @@ func formatCallStackParams(e callStackParamsProvider) string {
 }
 
 // FormatFunctionCall formats a function call in pseudo syntax
-// using github.com/domonda/go-pretty to format the params.
-// Used to format errors with function call stack information.
-func FormatFunctionCall(function string, params ...any) string {
+// using the PrintForCallStack method of params that implement
+// the CallStackPrintable interface or github.com/domonda/go-pretty
+// to format params that don't implement CallStackPrintable.
+//
+// FormatFunctionCall is a function variable that can be changed
+// to globally configure the formatting of function calls.
+var FormatFunctionCall = func(function string, params ...any) string {
 	var b strings.Builder
 	b.WriteString(function)
 	b.WriteByte('(')
 	for i, param := range params {
 		if i > 0 {
 			b.WriteString(", ")
 		}
-		pretty.Fprint(&b, param)
+		if printable, ok := param.(CallStackPrintable); ok {
+			printable.PrintForCallStack(&b)
+		} else {
+			pretty.Fprint(&b, param)
+		}
 	}
 	b.WriteByte(')')
 	return b.String()

go.mod

@@ -3,8 +3,8 @@ module github.com/domonda/go-errs
 go 1.22
 
 require (
-	github.com/domonda/go-pretty v0.0.0-20230810130018-8920f571470a
-	github.com/stretchr/testify v1.8.4
+	github.com/domonda/go-pretty v0.0.0-20240110134850-17385799142f
+	github.com/stretchr/testify v1.9.0
 )
 
 require (

go.sum

@@ -1,11 +1,11 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/domonda/go-pretty v0.0.0-20230810130018-8920f571470a h1:b3a6MwwMrHR9dw6585e3Ky51T50OKuD3fRuLyh8ziEw=
-github.com/domonda/go-pretty v0.0.0-20230810130018-8920f571470a/go.mod h1:3QkM8UJdyJMeKZiIo7hYzSkQBpRS3k0gOHw4ysyEIB4=
+github.com/domonda/go-pretty v0.0.0-20240110134850-17385799142f h1:5eA74m451PqlqCXyJzWXp95Quj4PZ6Lm/ndKBuiNhe4=
+github.com/domonda/go-pretty v0.0.0-20240110134850-17385799142f/go.mod h1:3QkM8UJdyJMeKZiIo7hYzSkQBpRS3k0gOHw4ysyEIB4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=