/
diff.go
66 lines (54 loc) · 1.36 KB
/
diff.go
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package lib
import (
"reflect"
"github.com/davecgh/go-spew/spew"
"github.com/pmezard/go-difflib/difflib"
)
var spewConfig = spew.ConfigState{
Indent: " ",
DisablePointerAddresses: true,
DisableCapacities: true,
SortKeys: true,
}
func typeAndKind(v interface{}) (reflect.Type, reflect.Kind) {
t := reflect.TypeOf(v)
k := t.Kind()
if k == reflect.Ptr {
t = t.Elem()
k = t.Kind()
}
return t, k
}
// Diff returns a diff of both values as long as both are of the same type and
// are a struct, map, slice, array or string. Otherwise it returns an empty string.
func Diff(expected interface{}, actual interface{}) string {
if expected == nil || actual == nil {
return ""
}
et, ek := typeAndKind(expected)
at, _ := typeAndKind(actual)
if et != at {
return ""
}
if ek != reflect.Struct && ek != reflect.Map && ek != reflect.Slice && ek != reflect.Array && ek != reflect.String {
return ""
}
var e, a string
if et != reflect.TypeOf("") {
e = spewConfig.Sdump(expected)
a = spewConfig.Sdump(actual)
} else {
e = expected.(string)
a = actual.(string)
}
diff, _ := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
A: difflib.SplitLines(e),
B: difflib.SplitLines(a),
FromFile: "Expected",
FromDate: "",
ToFile: "Actual",
ToDate: "",
Context: 1,
})
return "\n\nDiff:\n" + diff
}