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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package util | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
| "text/tabwriter" | ||
| ) | ||
|
|
||
| // TabbedStringBuilder is a wrapper around a *tabwriter.Writer that allows for efficiently building | ||
| // tab-aligned strings. | ||
| // This exists as *tabwriter.Writer exposes a more complicated interface which returns errors to the | ||
| // caller, propagated for the underlying IOWriter. In this case we ensure that the underlying Writer is | ||
| // a strings.Builder. This never returns errors therefore we can provide a simpler interface where the caller | ||
| // doesn't need to consider error handling. | ||
| type TabbedStringBuilder struct { | ||
| sb *strings.Builder | ||
| writer *tabwriter.Writer | ||
| } | ||
|
|
||
| // NewTabbedStringBuilder creates a new TabbedStringBuilder. All parameters are equivalent to those defined in tabwriter.NewWriter | ||
| func NewTabbedStringBuilder(minwidth, tabwidth, padding int, padchar byte, flags uint) *TabbedStringBuilder { | ||
| sb := &strings.Builder{} | ||
| return &TabbedStringBuilder{ | ||
| sb: sb, | ||
| writer: tabwriter.NewWriter(sb, minwidth, tabwidth, padding, padchar, flags), | ||
| } | ||
| } | ||
|
|
||
| // Writef formats according to a format specifier and writes to the underlying writer | ||
| func (t *TabbedStringBuilder) Writef(format string, a ...any) { | ||
| // should be safe ignore the error here as strings.Builder never errors | ||
| _, _ = fmt.Fprintf(t.writer, format, a...) | ||
| } | ||
|
|
||
| // Write the string to the underlying writer | ||
| func (t *TabbedStringBuilder) Write(a ...any) { | ||
| // should be safe ignore the error here as strings.Builder never errors | ||
| _, _ = fmt.Fprint(t.writer, a...) | ||
| } | ||
|
|
||
| // String returns the accumulated string. | ||
| // Flush on the underlying writer is automatically called | ||
| func (t *TabbedStringBuilder) String() string { | ||
| // should be safe ignore the error here as strings.Builder never errors | ||
| _ = t.writer.Flush() | ||
| return t.sb.String() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| package util | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestTabbedStringBuilder_TestSimple(t *testing.T) { | ||
| w := NewTabbedStringBuilder(1, 1, 1, ' ', 0) | ||
| w.Writef("a:\t%s", "b") | ||
| assert.Equal(t, "a: b", w.String()) | ||
| } | ||
|
|
||
| func TestTabbedStringBuilderWriter_TestComplex(t *testing.T) { | ||
| w := NewTabbedStringBuilder(1, 1, 1, ' ', 0) | ||
| w.Writef("a:\t%s\n", "b") | ||
| w.Writef("a:\t%.2f\t%d\n", 1.5, 2) | ||
| assert.Equal(t, "a: b\na: 1.50 2\n", w.String()) | ||
| } |
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