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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2020 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package messages
import (
"fmt"
"regexp"
"maunium.net/go/gomuks/config"
"maunium.net/go/gomuks/ui/messages/tstring"
)
// Regular expressions used to split lines when calculating the buffer.
//
// From tview/textview.go
var (
boundaryPattern = regexp.MustCompile(`([[:punct:]]\s*|\s+)`)
bareBoundaryPattern = regexp.MustCompile(`(\s+)`)
spacePattern = regexp.MustCompile(`\s+`)
)
func matchBoundaryPattern(bare bool, extract tstring.TString) tstring.TString {
regex := boundaryPattern
if bare {
regex = bareBoundaryPattern
}
matches := regex.FindAllStringIndex(extract.String(), -1)
if len(matches) > 0 {
if match := matches[len(matches)-1]; len(match) >= 2 {
if until := match[1]; until < len(extract) {
extract = extract[:until]
}
}
}
return extract
}
// CalculateBuffer generates the internal buffer for this message that consists
// of the text of this message split into lines at most as wide as the width
// parameter.
func calculateBufferWithText(prefs config.UserPreferences, text tstring.TString, width int, msg *UIMessage) []tstring.TString {
if width < 2 {
return nil
}
var buffer []tstring.TString
if prefs.BareMessageView {
newText := tstring.NewTString(msg.FormatTime())
if len(msg.Sender()) > 0 {
newText = newText.AppendTString(tstring.NewColorTString(fmt.Sprintf(" <%s> ", msg.Sender()), msg.SenderColor()))
} else {
newText = newText.Append(" ")
}
newText = newText.AppendTString(text)
text = newText
}
forcedLinebreaks := text.Split('\n')
newlines := 0
for _, str := range forcedLinebreaks {
if len(str) == 0 && newlines < 1 {
buffer = append(buffer, tstring.TString{})
newlines++
} else {
newlines = 0
}
// Adapted from tview/textview.go#reindexBuffer()
for len(str) > 0 {
extract := str.Truncate(width)
if len(extract) < len(str) {
if spaces := spacePattern.FindStringIndex(str[len(extract):].String()); spaces != nil && spaces[0] == 0 {
extract = str[:len(extract)+spaces[1]]
}
extract = matchBoundaryPattern(prefs.BareMessageView, extract)
}
buffer = append(buffer, extract)
str = str[len(extract):]
}
}
return buffer
}
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