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25 lines
734 B
Go
25 lines
734 B
Go
package testutil
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import (
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"fmt"
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"strings"
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)
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// Dedent removes an optional leading newline, and removes the indentation
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// present in the first line from all subsequent non-empty lines.
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//
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// Dedent panics if any non-empty line does not start with the same indentation
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// as the first line.
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func Dedent(text string) string {
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lines := strings.Split(strings.TrimPrefix(text, "\n"), "\n")
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line0 := lines[0]
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indent := line0[:len(line0)-len(strings.TrimLeft(lines[0], " \t"))]
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for i, line := range lines {
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if !strings.HasPrefix(line, indent) && line != "" {
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panic(fmt.Sprintf("line %d is not empty but doesn't start with %q", i, indent))
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}
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lines[i] = strings.TrimPrefix(line, indent)
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}
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return strings.Join(lines, "\n")
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}
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