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package sizes
import (
"bytes"
"fmt"
)
// Footnotes collects and numbers footnotes for a `table`.
type Footnotes struct {
footnotes []string
indexes map[string]int
}
// NewFootnotes creates and returns a new `Footnotes` instance.
func NewFootnotes() *Footnotes {
return &Footnotes{
indexes: make(map[string]int),
}
}
// CreateCitation adds a footnote with the specified text and returns
// the string that should be used to refer to it (e.g., "[2]"). If
// there is already a footnote with the exact same text, reuse its
// number.
func (f *Footnotes) CreateCitation(footnote string) string {
if footnote == "" {
return ""
}
index, ok := f.indexes[footnote]
if !ok {
index = len(f.indexes) + 1
f.footnotes = append(f.footnotes, footnote)
f.indexes[footnote] = index
}
return fmt.Sprintf("[%d]", index)
}
// String returns a string representation of the footnote, including a
// trailing LF.
func (f *Footnotes) String() string {
if len(f.footnotes) == 0 {
return ""
}
buf := &bytes.Buffer{}
buf.WriteByte('\n')
for i, footnote := range f.footnotes {
index := i + 1
citation := fmt.Sprintf("[%d]", index)
fmt.Fprintf(buf, "%-4s %s\n", citation, footnote)
}
return buf.String()
}
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