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// Eko: A terminal based social media platform
// Copyright (C) 2025 Kyren223
//
// 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 ui
import (
"strings"
"github.com/charmbracelet/lipgloss"
"github.com/charmbracelet/x/ansi"
"github.com/muesli/termenv"
)
// whitespace is a whitespace renderer.
type whitespace struct {
re *lipgloss.Renderer
style termenv.Style
chars string
}
// Render whitespaces.
func (w whitespace) render(width int) string {
if w.chars == "" {
w.chars = " "
}
r := []rune(w.chars)
j := 0
b := strings.Builder{}
// Cycle through runes and print them into the whitespace.
for i := 0; i < width; {
b.WriteRune(r[j])
j++
if j >= len(r) {
j = 0
}
i += ansi.StringWidth(string(r[j]))
}
// Fill any extra gaps white spaces. This might be necessary if any runes
// are more than one cell wide, which could leave a one-rune gap.
short := width - ansi.StringWidth(b.String())
if short > 0 {
b.WriteString(strings.Repeat(" ", short))
}
return w.style.Styled(b.String())
}
// WhitespaceOption sets a styling rule for rendering whitespace.
type WhitespaceOption func(*whitespace)
// WithWhitespaceForeground sets the color of the characters in the whitespace.
func WithWhitespaceForeground(c lipgloss.TerminalColor) WhitespaceOption {
return func(w *whitespace) {
w.style = w.style.Foreground(ToTermenvColor(w.re, c))
}
}
// WithWhitespaceBackground sets the background color of the whitespace.
func WithWhitespaceBackground(c lipgloss.TerminalColor) WhitespaceOption {
return func(w *whitespace) {
w.style = w.style.Background(ToTermenvColor(w.re, c))
}
}
// WithWhitespaceChars sets the characters to be rendered in the whitespace.
func WithWhitespaceChars(s string) WhitespaceOption {
return func(w *whitespace) {
w.chars = s
}
}
func ToTermenvColor(re *lipgloss.Renderer, c lipgloss.TerminalColor) termenv.Color {
color := c.(lipgloss.Color)
return re.ColorProfile().Color(string(color))
}
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