support for tab character

2 files changed, 26 insertions, 1 deletions

diff --git a/tui/layout.go b/tui/layout.go
index 9dea37d..f195048 100644
--- a/tui/layout.go
+++ b/tui/layout.go
@@ -202,6 +202,8 @@ func (b *Box) computeText(axis int) {
 				if g.Str() == "\n" {
 					maxLine = max(maxLine, line)
 					line = 0
+				} else if g.Str() == "\t" {
+					line += 4 - line % 4
 				} else {
 					line += g.Width()
 				}
@@ -225,14 +227,27 @@ func (b *Box) computeText(axis int) {
 			for g.Next() {
 				if !b.NoWrap {
 					word.add(g.Str(), run.style)
+					var moreWidth int
+					if g.Str() == "\t" {
+						moreWidth = 4 - line.width % 4
+					}
+
+					if line.width >= limit {
+						b.computedLines = append(b.computedLines, line.flush())
+					}
 					if word.width >= limit {
 						line.addRuns(word.flush())
-					} else if line.width + word.width > limit {
+					}
+					if line.width + word.width + moreWidth > limit {
 						b.computedLines = append(b.computedLines, line.flush())
 					}
+
 					if unicode.IsSpace(g.Runes()[0]) {
 						line.addRuns(word.flush())
 					}
+					if g.Str() == "\t" {
+						line.width += 4 - line.width % 4
+					}
 				} else {
 					line.add(g.Str(), run.style)
 				}
@@ -393,6 +408,13 @@ func (b *Box) drawComputed(parentRect rect, parentStyle Style) {
 			}
 			g := uniseg.NewGraphemes(t.text)
 			for g.Next() {
+				if g.Str() == "\t" {
+					base := b.computedRect.min[0] + b.Margins[0]
+					width := 4 - (x - base) % 4
+					for i := 0; i < width && x <= b.computedRect.max[0]; i++ {
+						x += WriteAt(x, y, " ", s)
+					}
+				}
 				if x + g.Width() <= b.computedRect.max[0] {
 					x += WriteAt(x, y, g.Str(), s)
 				} else {
diff --git a/tui/text_input.go b/tui/text_input.go
index c861f96..b5d2748 100644
--- a/tui/text_input.go
+++ b/tui/text_input.go
@@ -180,6 +180,9 @@ func (t *TextInput) Update(ev Event) (usedKeybind bool) {
 	if ev.TextInput != 0 {
 		t.Write(string(ev.TextInput))
 	}
+	if ev.Key == keys.Tab {
+		t.Write("\t")
+	}
 
 	selection := ev.Key & keys.Shift != 0
 	word := ev.Key & keys.Ctrl != 0