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|
package layout
import (
"strings"
"github.com/charmbracelet/lipgloss"
chAnsi "github.com/charmbracelet/x/ansi"
"github.com/muesli/ansi"
"github.com/muesli/reflow/truncate"
"github.com/muesli/termenv"
"github.com/sst/opencode/internal/styles"
"github.com/sst/opencode/internal/theme"
"github.com/sst/opencode/internal/util"
)
// Most of this code is borrowed from
// https://github.com/charmbracelet/lipgloss/pull/102
// as well as the lipgloss library, with some modification for what I needed.
// Split a string into lines, additionally returning the size of the widest
// line.
func getLines(s string) (lines []string, widest int) {
lines = strings.Split(s, "\n")
for _, l := range lines {
w := ansi.PrintableRuneWidth(l)
if widest < w {
widest = w
}
}
return lines, widest
}
// PlaceOverlay places fg on top of bg.
func PlaceOverlay(
x, y int,
fg, bg string,
shadow bool, opts ...WhitespaceOption,
) string {
fgLines, fgWidth := getLines(fg)
bgLines, bgWidth := getLines(bg)
bgHeight := len(bgLines)
fgHeight := len(fgLines)
if shadow {
t := theme.CurrentTheme()
baseStyle := styles.BaseStyle()
var shadowbg string = ""
shadowchar := lipgloss.NewStyle().
Background(t.BackgroundDarker()).
Foreground(t.Background()).
Render("░")
bgchar := baseStyle.Render(" ")
for i := 0; i <= fgHeight; i++ {
if i == 0 {
shadowbg += bgchar + strings.Repeat(bgchar, fgWidth) + "\n"
} else {
shadowbg += bgchar + strings.Repeat(shadowchar, fgWidth) + "\n"
}
}
fg = PlaceOverlay(0, 0, fg, shadowbg, false, opts...)
fgLines, fgWidth = getLines(fg)
fgHeight = len(fgLines)
}
if fgWidth >= bgWidth && fgHeight >= bgHeight {
// FIXME: return fg or bg?
return fg
}
// TODO: allow placement outside of the bg box?
x = util.Clamp(x, 0, bgWidth-fgWidth)
y = util.Clamp(y, 0, bgHeight-fgHeight)
ws := &whitespace{}
for _, opt := range opts {
opt(ws)
}
var b strings.Builder
for i, bgLine := range bgLines {
if i > 0 {
b.WriteByte('\n')
}
if i < y || i >= y+fgHeight {
b.WriteString(bgLine)
continue
}
pos := 0
if x > 0 {
left := truncate.String(bgLine, uint(x))
pos = ansi.PrintableRuneWidth(left)
b.WriteString(left)
if pos < x {
b.WriteString(ws.render(x - pos))
pos = x
}
}
fgLine := fgLines[i-y]
b.WriteString(fgLine)
pos += ansi.PrintableRuneWidth(fgLine)
right := cutLeft(bgLine, pos)
bgWidth := ansi.PrintableRuneWidth(bgLine)
rightWidth := ansi.PrintableRuneWidth(right)
if rightWidth <= bgWidth-pos {
b.WriteString(ws.render(bgWidth - rightWidth - pos))
}
b.WriteString(right)
}
return b.String()
}
// cutLeft cuts printable characters from the left.
// This function is heavily based on muesli's ansi and truncate packages.
func cutLeft(s string, cutWidth int) string {
return chAnsi.Cut(s, cutWidth, lipgloss.Width(s))
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
type whitespace struct {
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.PrintableRuneWidth(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.PrintableRuneWidth(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)
|
