feat: add a very simple info view

src/tui/info_view.zig

@@ -0,0 +1,64 @@
+const std = @import("std");
+const Allocator = @import("std").mem.Allocator;
+const Plane = @import("renderer").Plane;
+const Widget = @import("Widget.zig");
+
+pub const name = @typeName(Self);
+
+const Self = @This();
+
+allocator: std.mem.Allocator,
+plane: Plane,
+
+view_rows: usize = 0,
+lines: std.ArrayList([]const u8),
+
+pub fn create(allocator: Allocator, parent: Plane) !Widget {
+    const self: *Self = try allocator.create(Self);
+    self.* = .{
+        .allocator = allocator,
+        .plane = try Plane.init(&(Widget.Box{}).opts(name), parent),
+        .lines = std.ArrayList([]const u8).init(allocator),
+    };
+    return Widget.to(self);
+}
+
+pub fn deinit(self: *Self, allocator: Allocator) void {
+    self.clear();
+    self.lines.deinit();
+    self.plane.deinit();
+    allocator.destroy(self);
+}
+
+pub fn clear(self: *Self) void {
+    for (self.lines.items) |line|
+        self.allocator.free(line);
+    self.lines.clearRetainingCapacity();
+}
+
+pub fn handle_resize(self: *Self, pos: Widget.Box) void {
+    self.plane.move_yx(@intCast(pos.y), @intCast(pos.x)) catch return;
+    self.plane.resize_simple(@intCast(pos.h), @intCast(pos.w)) catch return;
+    self.view_rows = pos.h;
+}
+
+pub fn set_content(self: *Self, content: []const u8) !void {
+    self.clear();
+    var iter = std.mem.splitScalar(u8, content, '\n');
+    while (iter.next()) |line|
+        (try self.lines.addOne()).* = try self.allocator.dupe(u8, line);
+}
+
+pub fn render(self: *Self, theme: *const Widget.Theme) bool {
+    self.plane.set_base_style(" ", theme.panel);
+    self.plane.erase();
+    self.plane.home();
+    for (self.lines.items) |line| {
+        _ = self.plane.putstr(line) catch {};
+        if (self.plane.cursor_y() >= self.view_rows - 1)
+            return false;
+        self.plane.cursor_move_yx(-1, 0) catch {};
+        self.plane.cursor_move_rel(1, 0) catch {};
+    }
+    return false;
+}