49 lines
1003 B
Go
49 lines
1003 B
Go
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package markdown
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import (
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"fmt"
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"regexp"
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"strings"
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)
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var boldRe = regexp.MustCompile(`(?m)\*\*((?:[^\*]+\*?)+)\*\*`)
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// boldify returns the terminal-formatted bold text @t
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func boldify(t string) string {
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return fmt.Sprintf("\x1b[1m%s\x1b[22m", strings.Replace(t, "\x1b[0m", "\x1b[0m\x1b[1m", -1))
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}
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// boldTransform the @input text using markdown-like syntax :
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// - "normal **bold** normal"
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func boldTransform(input string) (string, error) {
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output := ""
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cursor := int(0)
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// 1. Replace for each match
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for _, match := range boldRe.FindAllStringSubmatchIndex(input, -1) {
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// (1) add gap between input start OR previous match
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output += input[cursor:match[0]]
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cursor = match[1]
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// (2) extract features
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text := ""
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if match[3]-match[2] > 0 {
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text = input[match[2]:match[3]]
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}
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// (3) replace text with bold text
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output += boldify(text)
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}
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// 2. Add end of input
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if cursor < len(input)-1 {
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output += input[cursor:]
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}
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// 3. print final output
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return output, nil
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}
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