1 files changed, 155 insertions, 0 deletions
diff --git a/libui/list/list.ha b/libui/list/list.ha
new file mode 100644
index 0000000..6b11b75
--- /dev/null
+++ b/libui/list/list.ha
@@ -0,0 +1,155 @@
+use libui;
+use fmt;
+use os;
+use strings;
+use io;
+use strio;
+use unix::tty;
+use wcwidth;
+
+export type listwidget = struct {
+	ui: libui::ttyui,
+	items: []str,
+	cursor: size,
+	listeners: []listener,
+	frame: frame,
+	sz: ttysize,
+};
+
+export type frame = struct {
+	start: u16,
+	// largest value is nb of items
+	end: u16,
+};
+
+export type ttysize = struct {
+	rows: u16,
+	cols: u16,
+};
+
+export type listener = *fn(l: *listwidget, r: rune) bool;
+
+export fn newlist(ui: libui::ttyui, items: str...) listwidget = {
+	let sz = libui::getwinsize(ui)!;
+	let rows: (u16 | size) = if (sz.rows - 2 < len(items)) {
+		yield sz.rows - 2;
+	} else {
+		yield len(items);
+	};
+	let w = listwidget {
+		ui = ui,
+		items = items,
+		cursor = 0z,
+		listeners = [],
+		frame = frame {
+			start = 0u16,
+			end = rows: u16,
+		},
+		sz = ttysize {
+			rows = rows: u16,
+			cols = sz.columns,
+		},
+	};
+	return w;
+};
+
+export fn addlistener(list: *listwidget, l: listener) void = {
+	append(list.listeners, l);
+};
+
+export fn print(list: *listwidget) (void | io::error | tty::error) = {
+	let sz = libui::getwinsize(list.ui)?;
+	let rows: (u16 | size) = if (sz.rows - 2 < len(list.items)) {
+		yield sz.rows - 2;
+	} else {
+		yield len(list.items);
+	};
+
+	//fmt::fprintln(os::stderr, rows)!;
+
+	list.frame.end = list.frame.start + rows: u16;
+
+	let st = strio::dynamic();
+	strio::concat(&st, "\r")?;
+	for (let i = list.frame.start; i < list.frame.end: u16; i += 1) {
+		let item = list.items[i];
+		let truncitem = wcwidth::truncate(item, sz.columns);
+		if (list.cursor == i) {
+			strio::concat(&st, "\x1B[104;1m\x1B[30m")?;
+			strio::concat(&st, truncitem)?;
+			strio::concat(&st, "\x1B[0m")?;
+			//libui::print(list.ui, strings::concat("\x1B[31;1m> ", list.items[i], "\x1B[0m"));
+		} else {
+			strio::concat(&st, truncitem)?;
+			//libui::print(list.ui, list.items[i]);
+		};
+		strio::concat(&st, "\r\n")?;
+	};
+	let s = strio::string(&st);
+	defer free(s);
+	libui::print(list.ui, s);
+};
+
+export fn notify(l: *listwidget, r: rune) bool = {
+	for (let i = 0z; i < len(l.listeners); i += 1) {
+		if (l.listeners[i](l, r)) {
+			return true;
+		};
+	};
+	return false;
+};
+
+export fn down(l: *listwidget) size = {
+	if (l.cursor < len(l.items) - 1) {
+		l.cursor += 1;
+	};
+	reframe(l);
+	return l.cursor;
+};
+
+export fn up(l: *listwidget) size = {
+	if (l.cursor > 0) {
+		l.cursor -= 1;
+	};
+	reframe(l);
+	return l.cursor;
+};
+
+fn reframe(l: *listwidget) bool = {
+	let reframed: bool = false;
+	if (l.cursor < l.frame.start) {
+		l.frame.end -= l.frame.start - l.cursor: u16;
+		l.frame.start = l.cursor: u16;
+		reframed = true;
+	};
+	if (l.cursor >= l.frame.end) {
+		l.frame.start += l.cursor: u16 - l.frame.end + 1;
+		l.frame.end = l.cursor: u16;
+		reframed = true;
+	};
+	return reframed;
+};
+
+export fn top(l: *listwidget) size = {
+	l.cursor = 0;
+	l.frame.start = 0;
+	l.frame.end = l.frame.start + l.sz.rows;
+	return l.cursor;
+};
+
+export fn bottom(l: *listwidget) size = {
+	l.cursor = len(l.items) - 1;
+	l.frame.end = len(l.items): u16;
+	l.frame.start = l.frame.end - l.sz.rows;
+	return l.cursor;
+};
+
+export fn search(l: *listwidget, s: str) size = {
+	for (let i = 0z; i < len(l.items); i += 1) {
+		if (strings::contains(l.items[i], s)) {
+			l.cursor = i;
+			reframe(l);
+		};
+	};
+	return l.cursor;
+};