Tree Formattar for Zig

Pretty prints out Zig Values for your debugging needs.
If you faces any issue with formatting, kindly open an issue.

Versioning

Current main branch tracks zig latest version
If you need a stable version, see release tags

Objective

Provide a colored tree-like visual representation of a Zig value to aid in debugging.

Features

Colored output to distinguish between types and values
Indentation to show the structure of the value
Special formatters for following types (Do file a PR or FR if you think there are more types that can require special formatting)
- std.MultiArrayList
- std.HashMapUnmanaged

Screenshot

Example

You can run on of the examples in the examples by executing the following command:

zig build test -Dtest-filter="anon struct 1"

You might need to require to remove zig-cache to run it again without changes.

Usage

Zig Package Manager Example: https://github.com/speed2exe/tree-fmt-example
zig.build.zon

.{
    .name = "your_package_name",
    .version = "0.0.1",
    .dependencies = .{
        .tree_fmt = .{
            // c6398b225f15cdbe35b3951920f634ffd1c65c12 is just commit hash
            .url = "https://github.com/speed2exe/tree-fmt/archive/c6398b225f15cdbe35b3951920f634ffd1c65c12.tar.gz",
            // just do `zig build`, get the error code and replace with expected hash
            .hash = "12201dceb9a9c2c9a6fc83105a7f408132b9ab69173b266e7df2af2c1dd6f814cd51",
        },
    },
    .paths = .{ "" },
}

build.zig

pub fn build(b: *std.Build) void {
    // ...
    const dep = b.dependency("tree_fmt", .{});
    const tree_fmt = dep.module("tree-fmt");
    your_program.root_module.addImport("tree-fmt", tree_fmt);
}

Quick Setup

Fastest and easiest way to if you want to save time and effort.
This example is in example_default_tree_formatter.zig

var tree_formatter = @import("tree-fmt").defaultFormatter();

pub fn main() !void {
    const my_struct = .{ 1, 2.4, "hi" };
    try tree_formatter.format(my_struct, .{
        .name = "my_struct", // (optional) just an identifier to the root of the tree
    });
}

Output:

some_anon_struct: tuple{comptime comptime_int = 1, comptime comptime_float = 2.4, comptime *const [2:0]u8 = "hi"}
├─.0: comptime_int => 1
├─.1: comptime_float => 2.4e+00
└─.2: *const [2:0]u8 @21d169
  └─.*: [2:0]u8 hi
    ├─[0]: u8 => 104
    └─[1]: u8 => 105

Proper Setup

This is recommended, as it gives you more control over writer, allocator and settings.

const std = @import("std");

// add imports here
const treeFormatter = @import("tree-fmt").treeFormatter;

pub fn main() !void {
    // initialize your allocator
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    const allocator = gpa.allocator();
    defer {
        const leaked = gpa.deinit();
        if (leaked) {
            @panic("leaked memory!");
        }
    }

    // initialize a writer (std.io.Writer)
    // tips if you print a lot: wrap with std.io.BufferedWriter to improve performance
    var w = std.io.getStdOut().writer();

    // initialize TreeFormatter with allocator and writer
    var tree_formatter = treeFormatter(allocator, w);

    // initialize your value
    var sentinel_array: [*:0]const u8 = "hello world";

    // call the method with writer and value
    try tree_formatter.formatValueWithId(sentinel_array, .{
        // .name = "sentinel_array", <-- example setting
        // you can find settings at @import("./src/tree_fmt.zig").TreeFormatterSettings;
        // you can also leave it blank to use default settings
    });
}

Output:

sentinel_array: [*:0]const u8 @20a71e "hello world"
├─[0]: u8 => 104
├─[1]: u8 => 101
├─[2]: u8 => 108
├─[3]: u8 => 108
├─[4]: u8 => 111
├─[5]: u8 => 32
├─[6]: u8 => 119
├─[7]: u8 => 111
├─[8]: u8 => 114
├─[9]: u8 => 108
└─... (showed first 10 out of 11 items only)

You can find other examples in the examples directory. To run specific example(s):

    zig build test -Dtest-filter="name of test"
    # e.g. zig build test -Dtest-filter="anon struct 1"

Example

std.ArrayList(u8)

.: array_list.ArrayListAligned(u8,null)
├─.items: []u8 @7efcc912f000
│ ├─[0]: u8 => 0
│ ├─[1]: u8 => 1
│ ├─[2]: u8 => 2
│ ├─[3]: u8 => 3
│ ├─[4]: u8 => 4
│ └─... (showed first 5 out of 100 items only)
├─.capacity: usize => 105
└─.allocator: mem.Allocator
  ├─.ptr: *anyopaque @7fffadc5b3d8
  └─.vtable: *const mem.Allocator.VTable @202a38
    └─.*: mem.Allocator.VTable
      ├─.alloc: *const fn(*anyopaque, usize, u8, usize) ?[*]u8 @238e00
      ├─.resize: *const fn(*anyopaque, []u8, u8, usize, usize) bool @2393c0
      └─.free: *const fn(*anyopaque, []u8, u8, usize) void @23a2d0

std.AutoHashMap(u8, u8)

map: hash_map.HashMap(u8,u8,hash_map.AutoContext(u8),80)
├─.unmanaged: hash_map.HashMapUnmanaged(u8,u8,hash_map.AutoContext(u8),80)
│ ├─.iterator()
│ │ ├─.next(): hash_map.HashMapUnmanaged(u8,u8,hash_map.AutoContext(u8),80).Entry
│ │ │ ├─.key_ptr: *u8 @7fcad47f5021
│ │ │ │ └─.*: u8 => 1
│ │ │ └─.value_ptr: *u8 @7fcad47f5029
│ │ │   └─.*: u8 => 2
│ │ ├─.next(): hash_map.HashMapUnmanaged(u8,u8,hash_map.AutoContext(u8),80).Entry
│ │ │ ├─.key_ptr: *u8 @7fcad47f5022
│ │ │ │ └─.*: u8 => 0
│ │ │ └─.value_ptr: *u8 @7fcad47f502a
│ │ │   └─.*: u8 => 0
│ │ └─.next(): hash_map.HashMapUnmanaged(u8,u8,hash_map.AutoContext(u8),80).Entry
│ │   ├─.key_ptr: *u8 @7fcad47f5026
│ │   │ └─.*: u8 => 2
│ │   └─.value_ptr: *u8 @7fcad47f502e
│ │     └─.*: u8 => 4
│ ├─.metadata: ?[*]hash_map.HashMapUnmanaged(u8,u8,hash_map.AutoContext(u8),80).Metadata
│ │ └─.?: [*]hash_map.HashMapUnmanaged(u8,u8,hash_map.AutoContext(u8),80).Metadata @7fcad47f5018
│ ├─.size: u32 => 3
│ └─.available: u32 => 3
├─.allocator: mem.Allocator
│ ├─.ptr: *anyopaque @7ffc3b6baca0
│ └─.vtable: *const mem.Allocator.VTable @2045b8
│   └─.*: mem.Allocator.VTable
│     ├─.alloc: *const fn(*anyopaque, usize, u8, usize) ?[*]u8 @2433a0
│     ├─.resize: *const fn(*anyopaque, []u8, u8, usize, usize) bool @243960
│     └─.free: *const fn(*anyopaque, []u8, u8, usize) void @244870
└─.ctx: hash_map.AutoContext(u8) => .{}

std.MultiArrayList... (see example_multi_array_list.zig)

multi_array_list: multi_array_list.MultiArrayList(example_multi_array_list.Person)
├─.slice(): multi_array_list.MultiArrayList(example_multi_array_list.Person).Slice
│ └─.items
│   ├─(.id): []u64 @7f8cf20c3000
│   │ ├─[0]: u64 => 0
│   │ ├─[1]: u64 => 1
│   │ ├─[2]: u64 => 2
│   │ ├─[3]: u64 => 3
│   │ ├─[4]: u64 => 4
│   │ └─... (showed first 5 out of 7 items only)
│   ├─(.age): []u8 @7f8cf20c3080
│   │ ├─[0]: u8 => 0
│   │ ├─[1]: u8 => 1
│   │ ├─[2]: u8 => 2
│   │ ├─[3]: u8 => 3
│   │ ├─[4]: u8 => 4
│   │ └─... (showed first 5 out of 7 items only)
│   └─(.car): []example_multi_array_list.Car @7f8cf20c3040
│     ├─[0]: example_multi_array_list.Car
│     │ └─.license_plate_no: u64 => 555
│     ├─[1]: example_multi_array_list.Car
│     │ └─.license_plate_no: u64 => 555
│     ├─[2]: example_multi_array_list.Car
│     │ └─.license_plate_no: u64 => 555
│     ├─[3]: example_multi_array_list.Car
│     │ └─.license_plate_no: u64 => 555
│     ├─[4]: example_multi_array_list.Car
│     │ └─.license_plate_no: u64 => 555
│     └─... (showed first 5 out of 7 items only)
├─.get
│ ├─(0): example_multi_array_list.Person
│ │ ├─.id: u64 => 0
│ │ ├─.age: u8 => 0
│ │ └─.car: example_multi_array_list.Car
│ │   └─.license_plate_no: u64 => 555
│ ├─(1): example_multi_array_list.Person
│ │ ├─.id: u64 => 1
│ │ ├─.age: u8 => 1
│ │ └─.car: example_multi_array_list.Car
│ │   └─.license_plate_no: u64 => 555
│ ├─(2): example_multi_array_list.Person
│ │ ├─.id: u64 => 2
│ │ ├─.age: u8 => 2
│ │ └─.car: example_multi_array_list.Car
│ │   └─.license_plate_no: u64 => 555
│ ├─(3): example_multi_array_list.Person
│ │ ├─.id: u64 => 3
│ │ ├─.age: u8 => 3
│ │ └─.car: example_multi_array_list.Car
│ │   └─.license_plate_no: u64 => 555
│ └─... (showed first 4 out of 7 items only)
├─.bytes: [*]align(8) u8 @7f8cf20c3000
├─.len: usize => 7
└─.capacity: usize => 8

multi_array_list.MultiArrayList(zig.Ast.TokenList__struct_4206).Slice

ast: multi_array_list.MultiArrayList(zig.Ast.TokenList__struct_4200).Slice
├─.toMultiArrayList(): multi_array_list.MultiArrayList(zig.Ast.TokenList__struct_4200)
│ ├─.slice(): multi_array_list.MultiArrayList(zig.Ast.TokenList__struct_4200).Slice
│ │ └─.items
│ │   ├─(.tag): []zig.tokenizer.Token.Tag @7ff3c81f7098
│ │   │ ├─[0]: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.keyword_const (86)
│ │   │ ├─[1]: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.identifier (2)
│ │   │ ├─[2]: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.equal (12)
│ │   │ ├─[3]: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.builtin (7)
│ │   │ ├─[4]: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.l_paren (16)
│ │   │ └─... (showed first 5 out of 31 items only)
│ │   └─(.start): []u32 @7ff3c81f7000
│ │     ├─[0]: u32 => 1
│ │     ├─[1]: u32 => 7
│ │     ├─[2]: u32 => 11
│ │     ├─[3]: u32 => 13
│ │     ├─[4]: u32 => 20
│ │     └─... (showed first 5 out of 31 items only)
│ ├─.get
│ │ ├─(0): zig.Ast.TokenList__struct_4200
│ │ │ ├─.tag: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.keyword_const (86)
│ │ │ └─.start: u32 => 1
│ │ ├─(1): zig.Ast.TokenList__struct_4200
│ │ │ ├─.tag: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.identifier (2)
│ │ │ └─.start: u32 => 7
│ │ ├─(2): zig.Ast.TokenList__struct_4200
│ │ │ ├─.tag: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.equal (12)
│ │ │ └─.start: u32 => 11
│ │ ├─(3): zig.Ast.TokenList__struct_4200
│ │ │ ├─.tag: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.builtin (7)
│ │ │ └─.start: u32 => 13
│ │ ├─(4): zig.Ast.TokenList__struct_4200
│ │ │ ├─.tag: zig.tokenizer.Token.Tag => zig.tokenizer.Token.Tag.l_paren (16)
│ │ │ └─.start: u32 => 20
│ │ └─... (showed first 5 out of 31 items only)
│ ├─.bytes: [*]align(4) u8 @7ff3c81f7000
│ ├─.len: usize => 31
│ └─.capacity: usize => 38
├─.ptrs: [2][*]u8
│ ├─[0]: [*]u8 @7ff3c81f7098
│ └─[1]: [*]u8 @7ff3c81f7000
├─.len: usize => 31
└─.capacity: usize => 38

Name		Name	Last commit message	Last commit date
Latest commit History 59 Commits
examples		examples
images		images
src		src
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
build.zig		build.zig

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