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examples: add readline example
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build.zig
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build.zig
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examples/readline.zig
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examples/readline.zig
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const std = @import("std");
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const vaxis = @import("vaxis");
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const Cell = vaxis.Cell;
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const TextInput = vaxis.widgets.TextInput;
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const border = vaxis.widgets.border;
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const log = std.log.scoped(.main);
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const Event = union(enum) {
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key_press: vaxis.Key,
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winsize: vaxis.Winsize,
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};
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer {
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const deinit_status = gpa.deinit();
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//fail test; can't try in defer as defer is executed after we return
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if (deinit_status == .leak) {
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log.err("memory leak", .{});
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}
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}
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const alloc = gpa.allocator();
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var line: ?[]const u8 = null;
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defer {
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// do this in defer so that vaxis cleans up terminal state before we
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// print to stdout
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if (line) |_| {
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const stdout = std.io.getStdOut().writer();
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stdout.print("\n{s}\n", .{line.?}) catch {};
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alloc.free(line.?);
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}
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}
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var vx = try vaxis.init(alloc, .{});
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defer vx.deinit(alloc);
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var loop: vaxis.Loop(Event) = .{ .vaxis = &vx };
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try loop.run();
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defer loop.stop();
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var text_input = TextInput.init(alloc, &vx.unicode);
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defer text_input.deinit();
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try vx.queryTerminal();
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const prompt: vaxis.Segment = .{ .text = "$ " };
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while (true) {
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const event = loop.nextEvent();
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switch (event) {
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.key_press => |key| {
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if (key.matches('c', .{ .ctrl = true })) {
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break;
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} else if (key.matches(vaxis.Key.enter, .{})) {
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line = try text_input.toOwnedSlice();
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text_input.clearAndFree();
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break;
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} else {
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try text_input.update(.{ .key_press = key });
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}
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},
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.winsize => |ws| try vx.resize(alloc, ws),
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}
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const win = vx.window();
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win.clear();
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_ = try win.printSegment(prompt, .{});
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const input_win = win.child(.{ .x_off = 2 });
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text_input.draw(input_win);
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try vx.render();
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}
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}