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|
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;
// Create a new list with the given items.
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;
};
// Add a listener to the given list.
export fn addlistener(list: *listwidget, l: listener) void = {
append(list.listeners, l);
};
// Print the list's items while truncating the items to not be wider than the
// list.sz.cols.
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 + list.sz.rows;
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, list.sz.cols);
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);
};
// Notify (call) the listwidget's listeners with the listwidget and r as a
// parameter.
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;
};
// Move the list's cursor down one item. Returns the new cursor.
export fn down(l: *listwidget) size = {
if (l.cursor < len(l.items) - 1) {
l.cursor += 1;
};
reframe(l);
return l.cursor;
};
// Move the list's cursor up one item. Returns the new cursor.
export fn up(l: *listwidget) size = {
if (l.cursor > 0) {
l.cursor -= 1;
};
reframe(l);
return l.cursor;
};
// Reset the list's frame based on the cursor. Returns whether the frame was
// updated.
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;
};
// Move the list's cursor to the top (first item). Returns the new cursor.
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;
};
// Move the list's cursor to the bottom (last item). Returns the new 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;
};
// Forward search through the list's items for an item containing s. Returns the
// new cursor.
export fn search(l: *listwidget, s: str) size = {
for (let i = l.cursor + 1; i < len(l.items); i += 1) {
if (strings::contains(l.items[i], s)) {
l.cursor = i;
reframe(l);
return l.cursor;
};
};
return l.cursor;
};
// Backwards search through the list's items for an item containing s. Returns
// the new cursor.
export fn rsearch(l: *listwidget, s: str) size = {
// size wraps to max value for size when < 0
for (let i = l.cursor: int - 1; i >= 0; i -= 1) {
if (strings::contains(l.items[i], s)) {
l.cursor = i: size;
reframe(l);
return l.cursor;
};
};
return l.cursor;
};
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