vaxis: send winsize at run, initialize screen to default cells

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>

examples/main.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const vaxis = @import("vaxis");
+const Cell = vaxis.Cell;
 
 const log = std.log.scoped(.main);
 pub fn main() !void {
@@ -21,6 +22,7 @@ pub fn main() !void {
 
     try vx.enterAltScreen();
 
+    const msg = "Hello, world!";
     outer: while (true) {
         const event = vx.nextEvent();
         log.debug("event: {}\r\n", .{event});
@@ -37,12 +39,17 @@ pub fn main() !void {
         }
 
         const win = vx.window();
-        _ = win;
+        const child = win.initChild(20, 20, .expand, .expand);
+        for (msg, 0..) |_, i| {
+            const cell: Cell = .{ .char = .{ .grapheme = msg[i .. i + 1] } };
+            child.writeCell(cell, i, 0);
+        }
+        try vx.render();
     }
 }
 
 const Event = union(enum) {
     key_press: vaxis.Key,
     winsize: vaxis.Winsize,
-    mouse: u8,
+    foo: u8,
 };

src/Screen.zig

@@ -24,6 +24,9 @@ pub fn deinit(self: *Screen, alloc: std.mem.Allocator) void {
 pub fn resize(self: *Screen, alloc: std.mem.Allocator, w: usize, h: usize) !void {
     alloc.free(self.buf);
     self.buf = try alloc.alloc(Cell, w * h);
+    for (self.buf, 0..) |_, i| {
+        self.buf[i] = .{};
+    }
     self.width = w;
     self.height = h;
 }

src/Tty.zig

@@ -60,7 +60,7 @@ pub fn run(
 
     // get our initial winsize
     const winsize = try getWinsize(self.fd);
-    log.debug("{}", .{winsize});
+    vx.postEvent(.{ .winsize = winsize });
 
     // assign the write end of the pipe to our quit_fd
     self.quit_fd = pipe[1];

src/Window.zig

@@ -25,7 +25,7 @@ screen: *Screen,
 /// parent's size. Windows do not retain a reference to their parent and are
 /// unaware of resizes.
 pub fn initChild(
-    self: *Window,
+    self: Window,
     x_off: usize,
     y_off: usize,
     width: Size,
@@ -60,7 +60,7 @@ pub fn initChild(
 
 /// writes a cell to the location in the window
 pub fn writeCell(self: Window, cell: Cell, row: usize, col: usize) void {
-    if (self.h < row or self.w < col) return;
+    if (self.height < row or self.width < col) return;
     self.screen.writeCell(cell, row + self.y_off, col + self.x_off);
 }
 

src/ctlseqs.zig

@@ -9,6 +9,7 @@ pub const csi_u_push = "\x1b[>{d}u";
 pub const csi_u_pop = "\x1b[<u";
 
 // Cursor
+pub const home = "\x1b[H";
 pub const cup = "\x1b[{d};{d}H";
 
 // alt screen

src/main.zig

@@ -1,6 +1,9 @@
 pub const Vaxis = @import("vaxis.zig").Vaxis;
 pub const Options = @import("Options.zig");
 
+const cell = @import("cell.zig");
+pub const Cell = cell.Cell;
+
 pub const Key = @import("Key.zig");
 pub const Winsize = @import("Tty.zig").Winsize;
 

src/vaxis.zig

@@ -110,21 +110,27 @@ pub fn Vaxis(comptime T: type) type {
         /// be exited if calling deinit while in the alt screen
         pub fn enterAltScreen(self: *Self) !void {
             if (self.alt_screen) return;
-            if (self.tty) |_| {
+            var tty = self.tty orelse return;
-                var tty = &self.tty.?;
             _ = try tty.write(ctlseqs.smcup);
             self.alt_screen = true;
         }
-        }
 
         /// exit the alternate screen
         pub fn exitaltScreen(self: *Self) !void {
             if (!self.alt_screen) return;
-            if (self.tty) |_| {
+            var tty = self.tty orelse return;
-                var tty = &self.tty.?;
             _ = try tty.write(ctlseqs.rmcup);
             self.alt_screen = false;
         }
+
+        pub fn render(self: *Self) !void {
+            log.debug("HERE", .{});
+            var tty = self.tty orelse return;
+
+            _ = try tty.write(ctlseqs.home);
+            for (self.screen.buf) |cell| {
+                _ = try tty.write(cell.char.grapheme);
+            }
         }
     };
 }