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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package htmldiff | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
| "sync" | ||
|
|
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| "github.com/a-h/htmlformat" | ||
| "github.com/a-h/templ" | ||
| "github.com/google/go-cmp/cmp" | ||
| ) | ||
|
|
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| func Diff(input templ.Component, expected string) (diff string, err error) { | ||
| var wg sync.WaitGroup | ||
| wg.Add(2) | ||
|
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| var errs []error | ||
|
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| // Format the expected value. | ||
| go func() { | ||
| defer wg.Done() | ||
| e := new(strings.Builder) | ||
| err := htmlformat.Fragment(e, strings.NewReader(expected)) | ||
| if err != nil { | ||
| errs = append(errs, fmt.Errorf("expected html formatting error: %w", err)) | ||
| } | ||
| expected = e.String() | ||
| }() | ||
|
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| // Pipe via the HTML formatter. | ||
| actual := new(strings.Builder) | ||
| r, w := io.Pipe() | ||
| go func() { | ||
| defer wg.Done() | ||
| err := htmlformat.Fragment(actual, r) | ||
| if err != nil { | ||
| errs = append(errs, fmt.Errorf("actual html formatting error: %w", err)) | ||
| } | ||
| }() | ||
|
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| // Render the component. | ||
| err = input.Render(context.Background(), w) | ||
| if err != nil { | ||
| errs = append(errs, fmt.Errorf("failed to render component: %w", err)) | ||
| } | ||
|
|
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| wg.Wait() | ||
|
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| return cmp.Diff(expected, actual.String()), errors.Join(errs...) | ||
| } |
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