altagos.dev
A pretty printer for zig
zig
pretty pointers
+241
-4
+56
example/employees.json
+56
example/employees.json
···
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+
{
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"employee": {
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"id": "E00001",
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"name": "Bryan Smith",
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"position": "Chemical engineer",
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"department": {
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"id": "D080",
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"name": "Incentivize",
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"manager": {
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"id": "M2858",
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"name": "Rebecca Andrews",
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"contact": {
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"email": "amanda52@example.net",
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"phone": "815-823-1247x52270"
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}
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}
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},
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"projects": [
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{
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"projectId": "P5216",
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"projectName": "Multi-tiered discrete Internet solution",
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"startDate": "2025-05-25",
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"tasks": [
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{
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"taskId": "T522",
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"title": "Evolve Best-Of-Breed E-Tailers",
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"status": "In Progress",
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"details": {
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"hoursSpent": 41,
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"technologiesUsed": [
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"Python",
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"SQL"
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],
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"expectedCompletion": "2025-09-11"
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}
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},
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{
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"taskId": "T405",
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"title": "Empower Cross-Media Users",
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"status": "In Progress",
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"details": {
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"hoursSpent": 41,
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"technologiesUsed": [
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"PyTorch",
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"JavaScript",
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"Python",
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"Scikit-learn"
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],
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"expectedCompletion": "2025-08-17"
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}
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}
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]
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}
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]
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}
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}
+81
-2
example/main.zig
+81
-2
example/main.zig
···
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.always_show_type_names = true,
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};
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const employees = @embedFile("employees.json");
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const Hello = enum { world, developer };
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const Gender = enum(u8) { male, female, nonbinary, other, _ };
···
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person: [2]Person,
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};
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const Employee = struct {
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id: []const u8,
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name: []const u8,
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position: []const u8,
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department: Department,
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projects: []Project,
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};
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const Department = struct {
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id: []const u8,
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name: []const u8,
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manager: Manager,
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+
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const Manager = struct {
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id: []const u8,
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name: []const u8,
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contact: Contact,
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+
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const Contact = struct {
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email: []const u8,
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phone: []const u8,
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};
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};
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};
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+
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const Project = struct {
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projectId: []const u8,
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projectName: []const u8,
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startDate: []const u8,
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tasks: []Task,
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const Task = struct {
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taskId: []const u8,
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title: []const u8,
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status: []const u8,
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details: Details,
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const Details = struct {
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hoursSpent: u32,
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technologiesUsed: [][]const u8,
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expectedCompletion: []const u8,
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};
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};
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};
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const JsonData = union(enum) {
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employee: Employee,
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};
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const ErrorSet = error{ OutOfMemory, WriteFailed };
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const Result = ErrorSet!Hello;
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pub fn main(init: std.process.Init) !void {
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_ = init;
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-
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print("Pretty type - {f}\n", .{pretty(Hello)});
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print("Pretty null - {f}\n", .{pretty(null)});
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···
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print("\nVectors\n", .{});
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print("Pretty vector of u8s - {f}\n", .{pretty(zig_logo_color)});
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const ptr_array = [_]f32{ 0.1, 0.3, 0.9 };
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const persons_allocated = try init.gpa.alloc(Person, 10);
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defer init.gpa.free(persons_allocated);
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+
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var str_allocated = try init.gpa.alloc(u8, 5);
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defer init.gpa.free(str_allocated);
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str_allocated[0] = 'H';
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str_allocated[1] = 'e';
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str_allocated[2] = 'l';
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str_allocated[3] = 'l';
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str_allocated[4] = 'o';
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+
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var buffer: [100]u8 = [_]u8{1} ** 100;
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const buffer_ptr: *[100]u8 = &buffer;
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const buffer_many_ptr: [*]u8 = buffer_ptr;
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print("\nPointers\n", .{});
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print("Pretty string - {f}\n", .{pretty("Hello World!")});
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print("Pretty ptr to an array - {f}\n", .{pretty(&ptr_array)});
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print("Pretty ptr to nested struct - {f}\n", .{pretty(&nested)});
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print("Pretty ptr to slice of structs - {f}\n", .{pretty(persons_allocated)});
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print("Pretty ptr to slice of u8 - {f}\n", .{pretty(str_allocated)});
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print("Pretty ptr to buffer many ptr - {f}\n", .{pretty(buffer_many_ptr)});
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const eu_error: Result = error.OutOfMemory;
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const eu_ok: Result = .world;
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···
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print("\nFunctions\n", .{});
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print("Pretty function pretty - {f}\n", .{pretty(pretty)});
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print("Pretty function main - {f}\n", .{pretty(main)});
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212
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const parsed: std.json.Parsed(JsonData) = try std.json.parseFromSlice(JsonData, init.gpa, employees, .{});
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defer parsed.deinit();
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215
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print("\nJson\n", .{});
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print("{}", .{parsed.value});
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}
+104
-2
pretty.zig
+104
-2
pretty.zig
···
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25
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inline_arrays: bool = false,
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always_show_index: bool = false,
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treat_u8_arrays_as_strings: bool = true,
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+
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treat_u8_ptr_as_string: bool = true,
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treat_u8_ptr_slice_as_string: bool = true,
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inline_slice: bool = false,
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inline_structs: bool = false,
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33
···
41
44
value,
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@"error",
43
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type,
47
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string,
48
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many_ptr,
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null,
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true,
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false,
···
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63
color_value: Io.Terminal.Color = .blue,
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color_error: Io.Terminal.Color = .red,
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color_type: Io.Terminal.Color = .bright_blue,
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color_string: Io.Terminal.Color = .magenta,
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color_many_ptr: Io.Terminal.Color = .magenta,
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color_null: Io.Terminal.Color = .cyan,
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color_true: Io.Terminal.Color = .bright_green,
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color_false: Io.Terminal.Color = .bright_red,
···
206
213
.error_union => formatErrorUnion(ctx, run, value),
207
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.array => |arr| formatArray(ctx, arr, run, value),
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// TODO: .pointer => |ptr| {},
210
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.vector => |vec| formatVector(ctx, vec, run, value),
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.@"fn" => formatFn(T, ctx, run),
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.pointer => |ptr| switch (ptr.size) {
221
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.one => formatPtrOne(ctx, ptr, run, value),
222
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.slice => formatPtrSlice(ctx, ptr, run, value),
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.many => formatPtrMany(ctx, ptr, run, value),
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else => {
225
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run.setColor(ctx, .@"error");
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try run.print("Unimplemented! ({} = {any})", .{ info, value });
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run.resetColor();
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},
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},
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else => {
215
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run.setColor(ctx, .@"error");
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try run.print("Unimplemented! ({} = {any})", .{ info, value });
···
413
430
414
431
run.setColor(ctx, .dim);
415
432
try run.write(" )");
433
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run.resetColor();
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+
}
435
+
436
+
inline fn formatPtrOne(
437
+
comptime ctx: Context,
438
+
comptime ptr: Type.Pointer,
439
+
run: *Runtime,
440
+
value: anytype,
441
+
) !void {
442
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const is_string = switch (@typeInfo(ptr.child)) {
443
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.array => |arr| arr.child == u8 and ctx.options.treat_u8_ptr_as_string,
444
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else => false,
445
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};
446
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if (is_string) return formatString(ctx, run, value);
447
+
448
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try innerFmt(ptr.child, ctx, run, value.*, .{ .skip_type_name = true });
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}
450
+
451
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inline fn formatPtrSlice(
452
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comptime ctx: Context,
453
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comptime ptr: Type.Pointer,
454
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run: *Runtime,
455
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value: anytype,
456
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) !void {
457
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if (ptr.child == u8 and ctx.options.treat_u8_ptr_slice_as_string)
458
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return formatString(ctx, run, value);
459
+
460
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const next_ctx = Context{
461
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.depth = ctx.depth + 1,
462
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.exited_comptime = ctx.exited_comptime,
463
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.options = ctx.options,
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};
465
+
466
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if (ctx.options.inline_slice) {
467
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run.setColor(ctx, .dim);
468
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try run.write("{ ");
469
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run.resetColor();
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+
}
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+
472
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for (value, 0..) |val, idx| {
473
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indent(
474
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next_ctx,
475
+
next_ctx.options.inline_slice,
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run,
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);
478
+
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run.setColor(ctx, .dim);
480
+
if (idx != 0 and ctx.options.inline_slice)
481
+
try run.write(", ");
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+
483
+
if (!ctx.options.inline_slice or ctx.options.always_show_index) {
484
+
try run.write(ctx.options.theme.index_open);
485
+
try run.print("{}", .{idx});
486
+
try run.write(ctx.options.theme.index_close ++
487
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ctx.options.theme.index_value_sep);
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+
}
489
+
490
+
run.resetColor();
491
+
492
+
try innerFmt(ptr.child, next_ctx, run, val, .{ .skip_type_name = true });
493
+
}
494
+
}
495
+
496
+
inline fn formatPtrMany(
497
+
comptime ctx: Context,
498
+
comptime ptr: Type.Pointer,
499
+
run: *Runtime,
500
+
value: anytype,
501
+
) !void {
502
+
_ = ptr;
503
+
run.setColor(ctx, .dim);
504
+
run.setColor(ctx, .many_ptr);
505
+
try run.print("{*}", .{value});
506
+
run.resetColor();
507
+
}
508
+
509
+
inline fn formatString(
510
+
comptime ctx: Context,
511
+
run: *Runtime,
512
+
value: anytype,
513
+
) !void {
514
+
run.setColor(ctx, .string);
515
+
try run.write("\"");
516
+
try run.write(value);
517
+
try run.write("\"");
416
518
run.resetColor();
417
519
}
418
520