Crate tabled 

An easy to use library for pretty print tables of Rust structs and enums.

There’s two approaches to construct a table.

1. When the type of data is known.
2. When it’s unknown.

Here you can work with both.
For first approach you shall find derive::Tabled macros being very helpfull.
For a later one you shall take a look at Builder.

There are a number of settings you can use
to change table appearance, layout and data itself.

Beside a default Table type there are more,
more specific table which works best when there are some constraints.

use tabled::{
    Tabled, Table, assert::assert_table,
    settings::{Style, Alignment, object::Columns},
};

#[derive(Tabled)]
struct Language {
    name: &'static str,
    designed_by: &'static str,
    invented_year: usize,
}

let languages = vec![
    Language{ name: "C", designed_by: "Dennis Ritchie", invented_year: 1972 },
    Language{ name: "Rust", designed_by: "Graydon Hoare", invented_year: 2010 },
    Language{ name: "Go", designed_by: "Rob Pike", invented_year: 2009 },
];

let mut table = Table::new(languages);
table.with(Style::modern());
table.modify(Columns::first(), Alignment::right());

assert_table!(
    table,
    "┌──────┬────────────────┬───────────────┐"
    "│ name │ designed_by    │ invented_year │"
    "├──────┼────────────────┼───────────────┤"
    "│    C │ Dennis Ritchie │ 1972          │"
    "├──────┼────────────────┼───────────────┤"
    "│ Rust │ Graydon Hoare  │ 2010          │"
    "├──────┼────────────────┼───────────────┤"
    "│   Go │ Rob Pike       │ 2009          │"
    "└──────┴────────────────┴───────────────┘"
);

Building table step by step

When you data scheme is not known at compile time.
You most likely will not able to relay on Table.
One option would be is to use Builder.

use std::iter::once;
use tabled::{builder::Builder, settings::Style, assert::assert_table};

const X: usize = 3;
const Y: usize = 5;

let mut builder = Builder::default();

for i in 0..X {
    let row = (0..Y).map(|j| (i * j).to_string());
    builder.push_record(row);
}

builder.insert_record(0, (0..Y).map(|i| i.to_string()));
builder.insert_column(0, once(String::new()).chain((0..X).map(|i| i.to_string())));

let mut table = builder.build();
table.with(Style::rounded());

assert_table!(
    table,
    "╭───┬───┬───┬───┬───┬───╮"
    "│   │ 0 │ 1 │ 2 │ 3 │ 4 │"
    "├───┼───┼───┼───┼───┼───┤"
    "│ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │"
    "│ 1 │ 0 │ 1 │ 2 │ 3 │ 4 │"
    "│ 2 │ 0 │ 2 │ 4 │ 6 │ 8 │"
    "╰───┴───┴───┴───┴───┴───╯"
);

Settings

You can find lots of settings in tabled::settings.

Hints

Table can be build from vast majority of Rust’s standard types.
This allows you to run the following code.

use tabled::{Table, assert::assert_table};

let table = Table::new(&[1, 2, 3]);

assert_table!(
    table,
    "+-----+"
    "| i32 |"
    "+-----+"
    "| 1   |"
    "+-----+"
    "| 2   |"
    "+-----+"
    "| 3   |"
    "+-----+"
);

You can compine types, and settings together using a tupples.
And achive magical results.

use tabled::{
    Table, assert::assert_table,
    settings::{style::{Style, HorizontalLine}, Alignment, Padding},
};

let data = &[(1, 2, "Hello"), (1, 3, "World")];

let mut table = Table::new(data);
table.with(
    Style::modern()
        .remove_horizontal()
        .horizontals([(1, HorizontalLine::inherit(Style::modern()))])
);
table.with((Alignment::right(), Padding::new(2, 0, 2, 1)));

assert_table!(
    table,
    "┌─────┬─────┬───────┐"
    "│     │     │       │"
    "│     │     │       │"
    "│  i32│  i32│   &str│"
    "│     │     │       │"
    "├─────┼─────┼───────┤"
    "│     │     │       │"
    "│     │     │       │"
    "│    1│    2│  Hello│"
    "│     │     │       │"
    "│     │     │       │"
    "│     │     │       │"
    "│    1│    3│  World│"
    "│     │     │       │"
    "└─────┴─────┴───────┘"
);

Be ware you don’t obligated to collect your data before building.

use tabled::{Tabled, Table, assert::assert_table};

let data = (0..3).map(|i| [i, i * 2, i * 3]);

let mut table = Table::new(data);

assert_table!(
    table,
    "+---+---+---+"
    "| 0 | 1 | 2 |"
    "+---+---+---+"
    "| 0 | 0 | 0 |"
    "+---+---+---+"
    "| 1 | 2 | 3 |"
    "+---+---+---+"
    "| 2 | 4 | 6 |"
    "+---+---+---+"
);

Build table using row! and col! macros.

use tabled::{row, col, assert::assert_table};

let table = row![
    col!["Hello", "World", "!"],
    col!["Hello"; 3],
    col!["World"; 3],
];

assert_table!(
    table,
    "+-----------+-----------+-----------+"
    "| +-------+ | +-------+ | +-------+ |"
    "| | Hello | | | Hello | | | World | |"
    "| +-------+ | +-------+ | +-------+ |"
    "| | World | | | Hello | | | World | |"
    "| +-------+ | +-------+ | +-------+ |"
    "| | !     | | | Hello | | | World | |"
    "| +-------+ | +-------+ | +-------+ |"
    "+-----------+-----------+-----------+"
);

no_std

Only CompactTable can be used in no_std context.

Features

• std - Used by default. If not its considered no_std with a limited set of functionality.
• derive - Used by default. A support for Tabled derive macro.
• ansi - A support for ANSI sequences.
• macros - A support for row!, col! macro.

More information

You can find more examples of settings and attributes in README.md

Re-exports

pub use crate::tables::Table;std

Modules

assertassert

Assert module contains a help macros to compare and test tables conveniently.

builderstd

Builder module provides a Builder type which helps building a Table dynamically.

derivederive

Module contains a list of helpers for work with derive.

grid

Module is responsible for tables underlyign grid.

iter

A module for iterator structures.

settings

Module contains various table configuration settings.

tables

Module contains a list of table representatives.

Macros

colmacros

Creates a Table with Display arguments nested within.

rowmacros

Creates a Table with Display arguments nested within.

Traits

Tabledstd

Tabled a trait responsible for providing a header fields and a row fields.

Derive Macros

Tabledderive

A derive macro to implement a Tabled trait.