add --font-size flag for font size in pixels

src/Grid.zig

@@ -12,6 +12,7 @@ const Terminal = terminal.Terminal;
 const gl = @import("opengl.zig");
 const gb = @import("gb_math.zig");
 const trace = @import("tracy/tracy.zig").trace;
+const Config = @import("config.zig").Config;
 
 const log = std.log.scoped(.grid);
 
@@ -101,15 +102,15 @@ const GPUCell = struct {
     mode: u8,
 };
 
-pub fn init(alloc: Allocator) !Grid {
+pub fn init(alloc: Allocator, config: *const Config) !Grid {
     // Initialize our font atlas. We will initially populate the
     // font atlas with all the visible ASCII characters since they are common.
     var atlas = try Atlas.init(alloc, 512);
     errdefer atlas.deinit(alloc);
     var fam = try font.Family.init(atlas);
     errdefer fam.deinit(alloc);
-    try fam.loadFaceFromMemory(.regular, face_ttf, 32);
-    try fam.loadFaceFromMemory(.bold, face_bold_ttf, 32);
+    try fam.loadFaceFromMemory(.regular, face_ttf, config.@"font-size");
+    try fam.loadFaceFromMemory(.bold, face_bold_ttf, config.@"font-size");
 
     // Load all visible ASCII characters and build our cell width based on
     // the widest character that we see.

src/Window.zig

@@ -148,7 +148,7 @@ pub fn create(alloc: Allocator, loop: libuv.Loop, config: *const Config) !*Windo
 
     // Create our terminal grid with the initial window size
     const window_size = try window.getSize();
-    var grid = try Grid.init(alloc);
+    var grid = try Grid.init(alloc, config);
     try grid.setScreenSize(.{ .width = window_size.width, .height = window_size.height });
     grid.background = .{
         .r = config.background.r,

src/cli_args.zig

@@ -72,17 +72,23 @@ fn parseIntoField(
                 const fieldInfo = @typeInfo(Field);
 
                 // If the type implements a parse function, call that.
-                if (fieldInfo == .Struct and @hasDecl(Field, "parseCLI"))
-                    break :field try Field.parseCLI(value);
-
-                // Otherwise infer based on type
-                break :field switch (Field) {
+                // NOTE(mitchellh): this is a pretty nasty break statement.
+                // I split it into two at first and it failed with Zig as of
+                // July 21, 2022. I think stage2+ will fix this so lets clean
+                // this up when that comes out.
+                break :field if (fieldInfo == .Struct and @hasDecl(Field, "parseCLI"))
+                    try Field.parseCLI(value)
+                else switch (Field) {
                     []const u8 => if (value) |slice| value: {
                         const buf = try alloc.alloc(u8, slice.len);
                         mem.copy(u8, buf, slice);
                         break :value buf;
                     } else return error.ValueRequired,
+
                     bool => try parseBool(value orelse "t"),
+
+                    u8 => try std.fmt.parseInt(u8, value orelse return error.ValueRequired, 0),
+
                     else => unreachable,
                 };
             };
@@ -177,6 +183,20 @@ test "parseIntoField: bool" {
     try testing.expectEqual(false, data.a);
 }
 
+test "parseIntoField: unsigned numbers" {
+    const testing = std.testing;
+    var arena = ArenaAllocator.init(testing.allocator);
+    defer arena.deinit();
+    const alloc = arena.allocator();
+
+    var data: struct {
+        @"u8": u8,
+    } = undefined;
+
+    try parseIntoField(@TypeOf(data), alloc, &data, "u8", "1");
+    try testing.expectEqual(@as(u8, 1), data.@"u8");
+}
+
 test "parseIntoField: optional field" {
     const testing = std.testing;
     var arena = ArenaAllocator.init(testing.allocator);

src/config.zig

@@ -2,6 +2,9 @@ const std = @import("std");
 const ArenaAllocator = std.heap.ArenaAllocator;
 
 pub const Config = struct {
+    /// Font size
+    @"font-size": u8 = 14,
+
     /// Background color for the window.
     background: Color = .{ .r = 0, .g = 0, .b = 0 },