45 lines
945 B
Go
45 lines
945 B
Go
package cli
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import (
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"io"
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"os"
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)
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// A Source is a method of extracting input from the user.
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type Source interface {
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// Extract fetches data from this source.
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Extract() (string, error)
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}
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// A StringSource is defined by a string.
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type StringSource struct{ Data string }
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// Extract pulls input data from the internal string.
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func (s StringSource) Extract() (string, error) { return s.Data, nil }
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// A StdinSource pulls from standard input.
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type StdinSource struct{}
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// Extract pulls input data from standard input.
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func (s StdinSource) Extract() (string, error) {
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data, err := io.ReadAll(os.Stdin)
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if err != nil {
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return "", err
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}
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return string(data), nil
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}
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// A FileSource reads from a file.
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type FileSource struct{ Path string }
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// Extract pulls input data from the file source.
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func (s FileSource) Extract() (string, error) {
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data, err := os.ReadFile(s.Path)
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if err != nil {
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return "", err
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}
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return string(data), nil
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}
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