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package assertions
import (
"fmt"
"github.com/smartystreets/assertions/internal/go-diff/diffmatchpatch"
)
func composePrettyDiff(expected, actual string) string {
diff := diffmatchpatch.New()
diffs := diff.DiffMain(expected, actual, false)
if prettyDiffIsLikelyToBeHelpful(diffs) {
return fmt.Sprintf("\nDiff: '%s'", diff.DiffPrettyText(diffs))
}
return ""
}
// prettyDiffIsLikelyToBeHelpful returns true if the diff listing contains
// more 'equal' segments than 'deleted'/'inserted' segments.
func prettyDiffIsLikelyToBeHelpful(diffs []diffmatchpatch.Diff) bool {
equal, deleted, inserted := measureDiffTypeLengths(diffs)
return equal > deleted && equal > inserted
}
func measureDiffTypeLengths(diffs []diffmatchpatch.Diff) (equal, deleted, inserted int) {
for _, segment := range diffs {
switch segment.Type {
case diffmatchpatch.DiffEqual:
equal += len(segment.Text)
case diffmatchpatch.DiffDelete:
deleted += len(segment.Text)
case diffmatchpatch.DiffInsert:
inserted += len(segment.Text)
}
}
return equal, deleted, inserted
}
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