56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package format
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import (
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"bytes"
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"html/template"
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)
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func detectLine(data []byte) (int, int) {
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lineFeed := bytes.IndexByte(data, '\n')
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if lineFeed == -1 {
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lineFeed = len(data)
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}
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lineEnd := lineFeed
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if lineEnd > 0 {
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c := data[lineEnd - 1]
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if c == '\r' {
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lineEnd -= 1
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}
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}
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nextLine := lineFeed + 1
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return lineEnd, nextLine
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}
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func Diff(text string) string {
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data := []byte(text)
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index := 0
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var html bytes.Buffer
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for index < len(data) {
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lineEnd, nextLine := detectLine(data[index:])
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lineEnd += index
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nextLine += index
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line := data[index:lineEnd]
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if len(line) < 1 {
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html.WriteString("\n");
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} else {
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c := line[0]
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htmlLine := template.HTMLEscapeString(string(line[1:]))
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if c == '+' {
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html.WriteString("<span class=\"plus\">+</span>")
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html.WriteString("<span class=\"plus-line\">" + htmlLine + "</span>\n")
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} else if c == '-' {
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html.WriteString("<span class=\"minus\">-</span>")
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html.WriteString("<span class=\"minus-line\">" + htmlLine + "</span>\n")
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} else {
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html.WriteString(" ")
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html.WriteString(htmlLine + "\n")
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}
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}
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index = nextLine
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}
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return html.String()
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}
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