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https://github.com/charmbracelet/lipgloss.git
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Add utility for horizontally joining text blocks
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parent
6bfa4297a0
commit
75544a8aac
86
join.go
Normal file
86
join.go
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package lipgloss
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import (
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"strings"
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"github.com/muesli/reflow/ansi"
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)
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type JoinType int
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const (
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JoinTop JoinType = iota
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JoinMiddle
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JoinBottom
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)
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// Join is a utility function for horizontally joining two potentially
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// multi-lined strings along a vertical axis.
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//
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// Example:
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//
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// blockB := "...\n...\n..."
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// blockA := "...\n...\n...\n...\n..."
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// fmt.Println(lipgloss.Join(blockA, blockB, lipgloss.AlignTop))
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//
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func Join(left, right string, joinType JoinType) string {
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l, leftWidth := getLines(left)
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r, rightWidth := getLines(right)
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// Add extra lines to make each side the same height
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if len(l) != len(r) {
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extraLines := make([]string, abs(len(l)-len(r)))
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switch joinType {
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case JoinMiddle:
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// Note: we add the remainder to the bottom.
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half := len(extraLines) / 2
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start := extraLines[half:]
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end := extraLines[:half]
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if len(l) < len(r) {
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l = append(start, l...)
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l = append(l, end...)
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break
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}
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r = append(start, r...)
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r = append(r, end...)
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case JoinBottom:
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if len(l) < len(r) {
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l = append(extraLines, l...)
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break
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}
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r = append(extraLines, r...)
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default: // JoinTop
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if len(l) < len(r) {
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l = append(l, extraLines...)
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break
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}
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r = append(r, extraLines...)
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}
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}
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// Merge lines
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var b strings.Builder
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for i := range l {
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b.WriteString(l[i])
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b.WriteString(strings.Repeat(" ", leftWidth-ansi.PrintableRuneWidth(l[i])))
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b.WriteString(r[i])
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b.WriteString(strings.Repeat(" ", rightWidth-ansi.PrintableRuneWidth(r[i])))
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if i < len(l) {
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b.WriteRune('\n')
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}
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}
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return b.String()
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}
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// Return the absolute value of an integer.
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func abs(n int) int {
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if n < 0 {
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return -n
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}
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return n
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}
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