--font-family CLI config

src/Grid.zig

@@ -58,8 +58,7 @@ texture: gl.Texture,
 texture_color: gl.Texture,
 
 /// The font structures.
-font_lib: font.Library,
-font_group: font.GroupCache,
+font_group: *font.GroupCache,
 font_shaper: font.Shaper,
 
 /// Whether the cursor is visible or not. This is used to control cursor
@@ -152,100 +151,7 @@ const GPUCellMode = enum(u8) {
     }
 };
 
-pub fn init(
-    alloc: Allocator,
-    font_size: font.Face.DesiredSize,
-) !Grid {
-    // Build our font group
-    var font_lib = try font.Library.init();
-    errdefer font_lib.deinit();
-    var font_group = try font.GroupCache.init(alloc, group: {
-        var group = try font.Group.init(alloc, font_lib, font_size);
-        errdefer group.deinit(alloc);
-
-        // Search for fonts
-        if (font.Discover != void) {
-            var disco = font.Discover.init();
-            defer disco.deinit();
-
-            {
-                var disco_it = try disco.discover(.{
-                    .family = "Fira Code",
-                    .size = font_size.points,
-                });
-                defer disco_it.deinit();
-                if (try disco_it.next()) |face| {
-                    log.debug("font regular: {s}", .{try face.name()});
-                    try group.addFace(alloc, .regular, face);
-                }
-            }
-            {
-                var disco_it = try disco.discover(.{
-                    .family = "Fira Code",
-                    .size = font_size.points,
-                    .bold = true,
-                });
-                defer disco_it.deinit();
-                if (try disco_it.next()) |face| {
-                    log.debug("font bold: {s}", .{try face.name()});
-                    try group.addFace(alloc, .bold, face);
-                }
-            }
-            {
-                var disco_it = try disco.discover(.{
-                    .family = "Fira Code",
-                    .size = font_size.points,
-                    .italic = true,
-                });
-                defer disco_it.deinit();
-                if (try disco_it.next()) |face| {
-                    log.debug("font italic: {s}", .{try face.name()});
-                    try group.addFace(alloc, .italic, face);
-                }
-            }
-            {
-                var disco_it = try disco.discover(.{
-                    .family = "Fira Code",
-                    .size = font_size.points,
-                    .bold = true,
-                    .italic = true,
-                });
-                defer disco_it.deinit();
-                if (try disco_it.next()) |face| {
-                    log.debug("font bold+italic: {s}", .{try face.name()});
-                    try group.addFace(alloc, .bold_italic, face);
-                }
-            }
-        }
-
-        // Our built-in font will be used as a backup
-        try group.addFace(
-            alloc,
-            .regular,
-            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_ttf, font_size)),
-        );
-        try group.addFace(
-            alloc,
-            .bold,
-            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_bold_ttf, font_size)),
-        );
-
-        // Emoji
-        try group.addFace(
-            alloc,
-            .regular,
-            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_ttf, font_size)),
-        );
-        try group.addFace(
-            alloc,
-            .regular,
-            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_text_ttf, font_size)),
-        );
-
-        break :group group;
-    });
-    errdefer font_group.deinit(alloc);
-
+pub fn init(alloc: Allocator, font_group: *font.GroupCache) !Grid {
     // Create the initial font shaper
     var shape_buf = try alloc.alloc(font.Shaper.Cell, 1);
     errdefer alloc.free(shape_buf);
@@ -381,7 +287,6 @@ pub fn init(
         .vbo = vbo,
         .texture = tex,
         .texture_color = tex_color,
-        .font_lib = font_lib,
         .font_group = font_group,
         .font_shaper = shaper,
         .cursor_visible = true,
@@ -394,8 +299,6 @@ pub fn init(
 pub fn deinit(self: *Grid) void {
     self.font_shaper.deinit();
     self.alloc.free(self.font_shaper.cell_buf);
-    self.font_group.deinit(self.alloc);
-    self.font_lib.deinit();
 
     self.texture.destroy();
     self.texture_color.destroy();
@@ -478,7 +381,7 @@ pub fn rebuildCells(self: *Grid, term: *Terminal) !void {
         const start = self.cells.items.len;
 
         // Split our row into runs and shape each one.
-        var iter = self.font_shaper.runIterator(&self.font_group, row);
+        var iter = self.font_shaper.runIterator(self.font_group, row);
         while (try iter.next(self.alloc)) |run| {
             for (try self.font_shaper.shape(run)) |shaper_cell| {
                 assert(try self.updateCell(
@@ -967,8 +870,3 @@ test "GridSize update rounding" {
     try testing.expectEqual(@as(GridSize.Unit, 3), grid.columns);
     try testing.expectEqual(@as(GridSize.Unit, 2), grid.rows);
 }
-
-const face_ttf = @embedFile("font/res/FiraCode-Regular.ttf");
-const face_bold_ttf = @embedFile("font/res/FiraCode-Bold.ttf");
-const face_emoji_ttf = @embedFile("font/res/NotoColorEmoji.ttf");
-const face_emoji_text_ttf = @embedFile("font/res/NotoEmoji-Regular.ttf");

src/Window.zig

@@ -35,6 +35,10 @@ const WRITE_REQ_PREALLOC = std.math.pow(usize, 2, 5);
 alloc: Allocator,
 alloc_io_arena: std.heap.ArenaAllocator,
 
+/// The font structures
+font_lib: font.Library,
+font_group: *font.GroupCache,
+
 /// The glfw window handle.
 window: glfw.Window,
 
@@ -237,13 +241,108 @@ pub fn create(alloc: Allocator, loop: libuv.Loop, config: *const Config) !*Windo
     gl.c.glEnable(gl.c.GL_BLEND);
     gl.c.glBlendFunc(gl.c.GL_SRC_ALPHA, gl.c.GL_ONE_MINUS_SRC_ALPHA);
 
-    // Create our terminal grid with the initial window size
-    const window_size = try window.getSize();
-    var grid = try Grid.init(alloc, .{
+    // The font size we desire along with the DPI determiend for the window
+    const font_size: font.Face.DesiredSize = .{
         .points = config.@"font-size",
         .xdpi = @floatToInt(u16, x_dpi),
         .ydpi = @floatToInt(u16, y_dpi),
+    };
+
+    // Find all the fonts for this window
+    var font_lib = try font.Library.init();
+    errdefer font_lib.deinit();
+    var font_group = try alloc.create(font.GroupCache);
+    errdefer alloc.destroy(font_group);
+    font_group.* = try font.GroupCache.init(alloc, group: {
+        var group = try font.Group.init(alloc, font_lib, font_size);
+        errdefer group.deinit(alloc);
+
+        // Search for fonts
+        if (font.Discover != void) {
+            var disco = font.Discover.init();
+            defer disco.deinit();
+
+            if (config.@"font-family") |family| {
+                var disco_it = try disco.discover(.{
+                    .family = family,
+                    .size = font_size.points,
+                });
+                defer disco_it.deinit();
+                if (try disco_it.next()) |face| {
+                    log.debug("font regular: {s}", .{try face.name()});
+                    try group.addFace(alloc, .regular, face);
+                }
+            }
+            if (config.@"font-family-bold") |family| {
+                var disco_it = try disco.discover(.{
+                    .family = family,
+                    .size = font_size.points,
+                    .bold = true,
+                });
+                defer disco_it.deinit();
+                if (try disco_it.next()) |face| {
+                    log.debug("font bold: {s}", .{try face.name()});
+                    try group.addFace(alloc, .bold, face);
+                }
+            }
+            if (config.@"font-family-italic") |family| {
+                var disco_it = try disco.discover(.{
+                    .family = family,
+                    .size = font_size.points,
+                    .italic = true,
+                });
+                defer disco_it.deinit();
+                if (try disco_it.next()) |face| {
+                    log.debug("font italic: {s}", .{try face.name()});
+                    try group.addFace(alloc, .italic, face);
+                }
+            }
+            if (config.@"font-family-bold-italic") |family| {
+                var disco_it = try disco.discover(.{
+                    .family = family,
+                    .size = font_size.points,
+                    .bold = true,
+                    .italic = true,
+                });
+                defer disco_it.deinit();
+                if (try disco_it.next()) |face| {
+                    log.debug("font bold+italic: {s}", .{try face.name()});
+                    try group.addFace(alloc, .bold_italic, face);
+                }
+            }
+        }
+
+        // Our built-in font will be used as a backup
+        try group.addFace(
+            alloc,
+            .regular,
+            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_ttf, font_size)),
+        );
+        try group.addFace(
+            alloc,
+            .bold,
+            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_bold_ttf, font_size)),
+        );
+
+        // Emoji
+        try group.addFace(
+            alloc,
+            .regular,
+            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_ttf, font_size)),
+        );
+        try group.addFace(
+            alloc,
+            .regular,
+            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_text_ttf, font_size)),
+        );
+
+        break :group group;
     });
+    errdefer font_group.deinit(alloc);
+
+    // Create our terminal grid with the initial window size
+    const window_size = try window.getSize();
+    var grid = try Grid.init(alloc, font_group);
     try grid.setScreenSize(.{ .width = window_size.width, .height = window_size.height });
     grid.background = .{
         .r = config.background.r,
@@ -333,6 +432,8 @@ pub fn create(alloc: Allocator, loop: libuv.Loop, config: *const Config) !*Windo
     self.* = .{
         .alloc = alloc,
         .alloc_io_arena = io_arena,
+        .font_lib = font_lib,
+        .font_group = font_group,
         .window = window,
         .cursor = cursor,
         .focused = false,
@@ -419,6 +520,9 @@ pub fn destroy(self: *Window) void {
     // windows using it to the default.
     self.cursor.destroy();
 
+    self.font_group.deinit(self.alloc);
+    self.font_lib.deinit();
+
     self.alloc_io_arena.deinit();
 }
 
@@ -1715,3 +1819,8 @@ pub fn invokeCharset(
 ) !void {
     self.terminal.invokeCharset(active, slot, single);
 }
+
+const face_ttf = @embedFile("font/res/FiraCode-Regular.ttf");
+const face_bold_ttf = @embedFile("font/res/FiraCode-Bold.ttf");
+const face_emoji_ttf = @embedFile("font/res/NotoColorEmoji.ttf");
+const face_emoji_text_ttf = @embedFile("font/res/NotoEmoji-Regular.ttf");

src/cli_args.zig

@@ -60,6 +60,8 @@ pub fn parse(comptime T: type, alloc: Allocator, dst: *T, iter: anytype) !void {
             try parseIntoField(T, arena_alloc, dst, key, value);
         }
     }
+
+    if (@hasDecl(T, "finalize")) try dst.finalize();
 }
 
 /// Parse a single key/value pair into the destination type T.
@@ -193,6 +195,28 @@ test "parse: simple" {
     try testing.expect(!data.@"b-f");
 }
 
+test "parse: finalize" {
+    const testing = std.testing;
+
+    var data: struct {
+        a: []const u8 = "",
+        _arena: ?ArenaAllocator = null,
+
+        pub fn finalize(self: *@This()) !void {
+            self.a = "YO";
+        }
+    } = .{};
+    defer if (data._arena) |arena| arena.deinit();
+
+    var iter = try std.process.ArgIteratorGeneral(.{}).init(
+        testing.allocator,
+        "--a=42",
+    );
+    defer iter.deinit();
+    try parse(@TypeOf(data), testing.allocator, &data, &iter);
+    try testing.expectEqualStrings("YO", data.a);
+}
+
 test "parseIntoField: string" {
     const testing = std.testing;
     var arena = ArenaAllocator.init(testing.allocator);

src/config.zig

@@ -7,10 +7,10 @@ const inputpkg = @import("input.zig");
 /// CLI flag names hence we use a lot of `@""` syntax to support hyphens.
 pub const Config = struct {
     /// The font families to use.
-    @"font-family": ?[]const u8 = null,
-    @"font-family-bold": ?[]const u8 = null,
-    @"font-family-italic": ?[]const u8 = null,
-    @"font-family-bold-italic": ?[]const u8 = null,
+    @"font-family": ?[:0]const u8 = null,
+    @"font-family-bold": ?[:0]const u8 = null,
+    @"font-family-italic": ?[:0]const u8 = null,
+    @"font-family-bold-italic": ?[:0]const u8 = null,
 
     /// Font size in points
     @"font-size": u8 = 12,
@@ -122,6 +122,25 @@ pub const Config = struct {
 
         return result;
     }
+
+    pub fn finalize(self: *Config) !void {
+        // If we have a font-family set and don't set the others, default
+        // the others to the font family. This way, if someone does
+        // --font-family=foo, then we try to get the stylized versions of
+        // "foo" as well.
+        if (self.@"font-family") |family| {
+            const fields = &[_][]const u8{
+                "font-family-bold",
+                "font-family-italic",
+                "font-family-bold-italic",
+            };
+            inline for (fields) |field| {
+                if (@field(self, field) == null) {
+                    @field(self, field) = family;
+                }
+            }
+        }
+    }
 };
 
 /// Color represents a color using RGB.