mirror of https://github.com/ergochat/ergo.git
68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
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// released under the MIT license
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package utils
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import "bytes"
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// WordWrap wraps the given text into a series of lines that don't exceed lineWidth characters.
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func WordWrap(text string, lineWidth int) []string {
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var lines []string
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var cacheLine, cacheWord bytes.Buffer
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for _, char := range text {
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if char == '\r' {
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continue
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} else if char == '\n' {
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cacheLine.Write(cacheWord.Bytes())
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lines = append(lines, cacheLine.String())
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cacheWord.Reset()
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cacheLine.Reset()
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} else if (char == ' ' || char == '-') && cacheLine.Len()+cacheWord.Len()+1 < lineWidth {
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// natural word boundary
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cacheLine.Write(cacheWord.Bytes())
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cacheLine.WriteRune(char)
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cacheWord.Reset()
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} else if lineWidth <= cacheLine.Len()+cacheWord.Len()+1 {
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// time to wrap to next line
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if cacheLine.Len() < (lineWidth / 2) {
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// this word takes up more than half a line... just split in the middle of the word
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cacheLine.Write(cacheWord.Bytes())
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cacheLine.WriteRune(char)
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cacheWord.Reset()
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} else {
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cacheWord.WriteRune(char)
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}
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lines = append(lines, cacheLine.String())
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cacheLine.Reset()
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} else {
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// normal character
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cacheWord.WriteRune(char)
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}
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}
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if 0 < cacheWord.Len() {
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cacheLine.Write(cacheWord.Bytes())
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}
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if 0 < cacheLine.Len() {
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lines = append(lines, cacheLine.String())
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}
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return lines
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}
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// SplitMessage represents a message that's been split for sending.
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type SplitMessage struct {
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Original string
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Wrapped []string // if this is nil, Original didn't need wrapping and can be sent to anyone
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}
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func MakeSplitMessage(original string, origIs512 bool) (result SplitMessage) {
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result.Original = original
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if !origIs512 {
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result.Wrapped = WordWrap(original, 400)
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}
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return
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}
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