termhyo

termhyo is a Go package for beautifully displaying tabular data. The name combines "terminal" and the Japanese word "表 (hyo)" meaning "table", and is specialized for terminal display.

Features

• Two rendering modes: Flexible display with BufferedMode and StreamingMode
• Multiple border styles: Choose from Box Drawing, ASCII, Rounded, Double, Minimal, and VerticalBar (only vertical | separators)
• Automatic width calculation: Automatic column width adjustment and alignment
• Unicode support: Proper handling of multibyte characters, combining characters, emojis, and East Asian text
• Interface design: Extensible renderer architecture

Installation

To install termhyo, use go get:

go get github.com/noborus/termhyo

Requirements

• Go 1.23 or later

Basic Usage

Simple Table

package main

import (
    "os"
    "github.com/noborus/termhyo"
)

func main() {
    columns := []termhyo.Column{
        {Title: "ID", Align: termhyo.Right},
        {Title: "Name", Align: termhyo.Left},
        {Title: "Score", Align: termhyo.Center},
    }

    table := termhyo.NewTable(os.Stdout, columns)
    table.AddRow("1", "Alice", "85")
    table.AddRow("2", "Bob", "92")
    table.Render()
}

Changing Border Style

table := termhyo.NewTable(os.Stdout, columns, termhyo.Border(termhyo.ASCIIStyle))

Text Alignment

termhyo provides type-safe alignment options:

// Available alignment constants
termhyo.Left     // Left-aligned text
termhyo.Center   // Center-aligned text
termhyo.Right    // Right-aligned text
termhyo.Default  // Default/unspecified alignment (defaults to left)

// Column-level alignment
columns := []termhyo.Column{
    {Title: "ID", Align: termhyo.Right},
    {Title: "Name", Align: termhyo.Left},
    {Title: "Score", Align: termhyo.Center},
}

// Cell-level alignment (overrides column alignment)
table.AddRowCells(
    termhyo.Cell{Content: "1", Align: termhyo.Center},
    termhyo.Cell{Content: "Alice"},  // Uses column alignment
    termhyo.Cell{Content: "85"},
)

Custom Border Configuration

// Create custom border configuration
customConfig := termhyo.TableBorderConfig{
    Chars: map[string]string{
        "horizontal": "=",
        "vertical":   "|",
        "cross":      "+",
        // ... other border characters
    },
    Top:      false, // No top border
    Bottom:   false, // No bottom border
    Middle:   true,  // Keep header separator
    Left:     false, // No left border
    Right:    false, // No right border
    Vertical: true,  // Keep internal column separators
    Padding:  true,  // Enable content padding
}

table := termhyo.NewTable(os.Stdout, columns, termhyo.BorderConfig(customConfig))

Running Examples

You can run various example programs to see termhyo in action. See the examples directory for more.

Rendering Modes

BufferedMode

• Collects all rows and renders them in batch
• Automatic width calculation and alignment possible
• Automatically selected when column width is 0 (auto) or alignment is enabled

StreamingMode

• Renders immediately as rows are added
• Automatically selected when fixed width and alignment disabled
• Memory efficient

Border Styles

• BoxDrawingStyle: Unicode Box Drawing characters (default)
• ASCIIStyle: ASCII characters
• RoundedStyle: Rounded corner style
• DoubleStyle: Double line style
• MinimalStyle: Minimal border
• VerticalBarStyle: Only vertical bar separators (|), no outer borders
• MarkdownStyle: Markdown table format
• TSVStyle: Tab-separated values format

License

MIT License