gorich

GoRich

A Go port of Python's Rich library for beautiful terminal output. Features styled text with markup syntax, progress bars, tables, and customizable displays.

Features

• Rich Print - Styled text with [bold red]markup[/] syntax
• Progress Bars - Multiple concurrent tasks with customizable columns and per-group sections
• Tables - Bordered tables with column styling, markup cells, row styles, footers, sections, and 19 box styles
• Flicker-free - Single-write buffered output for smooth updates
• Speed estimation - ETA calculation with rolling average
• File progress - io.Reader/io.Writer wrappers for IO tracking
• 50+ spinners - Animated spinners from cli-spinners
• Color support - Truecolor, 256-color, and 16-color with auto-downgrading
• Thread-safe - Safe for concurrent updates from multiple goroutines

Installation

go get github.com/depado/gorich

Quick Start - Rich Print

package main

import (
    "github.com/depado/gorich"
    "github.com/depado/gorich/console"
)

func main() {
    // Styled text with markup
    gorich.Print("[bold]Hello[/] [red]World[/]")
    gorich.Print("[italic green]Success![/]")
    gorich.Print("[bold white on blue]Highlighted[/]")
    
    // Hex and RGB colors
    gorich.Print("[#ff6600]Orange[/]")
    gorich.Print("[rgb(100,150,200)]Custom color[/]")
    
    // Printf style (no trailing newline, like standard printf)
    gorich.Printf("[bold]Count:[/] %d", 42)
    gorich.Printf(" - [green]done[/]\n")
    
    // Horizontal rules with optional styling
    gorich.Rule("Section Title")
    gorich.Rule("Styled Rule", console.WithRuleStyle("blue"))
    gorich.Rule("Styled Title", console.WithTitleStyle("bold red"))
}

Markup Syntax

*Italic support depends on your terminal and font. Many terminals don't support italic or require a font with italic glyphs.

Horizontal Rules

// Simple rule
gorich.Rule("Section Title")

// Style the rule line
gorich.Rule("Blue Line", console.WithRuleStyle("blue"))

// Style the title
gorich.Rule("Bold Title", console.WithTitleStyle("bold red"))

// Style both
gorich.Rule("Fancy", console.WithRuleStyle("dim"), console.WithTitleStyle("bold yellow"))

// Markup in title (combined with title style)
gorich.Rule("[green]Success[/]", console.WithRuleStyle("cyan"))

// Empty rule (just a line)
gorich.Rule("")

Progress Bars

package main

import (
    "context"
    "time"

    "github.com/depado/gorich/progress"
)

func main() {
    p := progress.New()
    p.Start(context.Background())
    defer p.Stop()

    total := 100.0
    task := p.AddTask("Processing", &total)

    for i := 0; i < 100; i++ {
        time.Sleep(50 * time.Millisecond)
        p.Advance(task, 1)
    }
}

Output:

Processing ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  75% • 0:00:02

Multiple Tasks

Task descriptions support the same markup syntax as gorich.Print():

p := progress.New()
p.Start(context.Background())
defer p.Stop()

total1, total2, total3 := 100.0, 200.0, 150.0

// Descriptions support [markup] syntax for colors and styles
task1 := p.AddTask("[cyan]Downloading[/]", &total1)
task2 := p.AddTask("[yellow]Processing[/]", &total2)
task3 := p.AddTask("[magenta]Uploading[/]", &total3)

// Update tasks concurrently - it's thread-safe
go func() {
    for i := 0; i < 100; i++ {
        p.Advance(task1, 1)
        time.Sleep(20 * time.Millisecond)
    }
}()
// ... similar for other tasks

Output:

Downloading ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% • 0:00:00
Processing  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  65% • 0:00:03
Uploading   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  80% • 0:00:01

Descriptions are left-aligned and automatically sized to the widest one so the bars line up. Pass progress.WithJustify(console.JustifyRight) for the classic right-aligned look, or progress.WithWidth(n) for a fixed width:

progress.DescriptionColumn(progress.WithJustify(console.JustifyRight))
progress.DescriptionColumn(progress.WithWidth(20))

Custom Columns

Customize the progress display with different column types:

p := progress.New(
    progress.WithColumns(
        progress.NewSpinnerColumn(),
        progress.DescriptionColumn(),
        progress.NewBarColumn(progress.WithBarWidth(30)),
        progress.NewDownloadColumn(false),
        progress.NewTransferSpeedColumn(false),
        progress.NewTimeRemainingColumn(),
    ),
)

Available Columns

File Progress

Track progress while reading files:

p := progress.New()
p.Start(context.Background())
defer p.Stop()

// Wrap a file with progress tracking
reader, taskID, err := p.WrapFile("large-file.bin", "Reading")
if err != nil {
    log.Fatal(err)
}
defer reader.Close()

// Read as normal - progress updates automatically
io.Copy(io.Discard, reader)

Or wrap any io.Reader:

resp, _ := http.Get("https://example.com/file.zip")
reader, taskID := p.WrapReader(resp.Body, resp.ContentLength, "Downloading")
io.Copy(file, reader)

Indeterminate Progress

For tasks with unknown total, pass nil - the bar will show a pulsing animation:

task := p.AddTask("Searching", nil)  // nil total = indeterminate

// Later, when you know the total:
total := 500.0
p.Update(task, progress.TaskUpdateConfig{Total: &total})

Marking Tasks as Done

Use Done() to explicitly mark a task as finished and optionally update its description:

task := p.AddTask("Waiting for API...", nil)  // indeterminate task
p.Done(task, "[green]Connected![/]")          // mark done + update description

Done() works on both indeterminate and determinate tasks. For determinate tasks that haven't reached 100%, it also sets completed to total for a proper visual finish (green bar, checkmark in spinner, etc.).

Sections

By default all tasks share one column layout. Use sections to give groups of tasks their own columns and indentation - for example a full summary bar on top with lightweight worker rows underneath:

p := progress.New(
    progress.WithColumns(                     // default section (section 0)
        progress.NewSpinnerColumn(),
        progress.DescriptionColumn(),
        progress.NewBarColumn(),
        progress.NewTaskProgressColumn(false),
        progress.NewSeparatorColumn("•"),
        progress.NewTimeRemainingColumn(),
    ),
)

// A second section with fewer columns, indented by 2 spaces
workers := p.AddSection(
    progress.WithSectionColumns(
        progress.NewSpinnerColumn(),
        progress.DescriptionColumn(),
    ),
    progress.WithSectionIndent(2),
)

p.Start(context.Background())
defer p.Stop()

total := 88.0
summary := p.AddTask("[bold]Syncing depado[/]", &total)   // goes to section 0
w1 := workers.AddTask("[cyan]articles - cloning...[/]", nil)  // goes to workers

// Every task is addressed by its TaskID regardless of section
p.Advance(summary, 1)
p.Done(w1, "[green]articles[/]")

Output:

⠸ Syncing depado ━━━━━━━━━━━━━━━━━━━━  45% • 0:01:23
  ⠸ articles - cloning...
  ⠸ buoy - pulling...
  ✓ gorich

Sections are a rendering grouping only: task updates always go through the Progress methods by TaskID. If you never call AddSection, behavior is identical to a single default section. Each section auto-sizes its own DescriptionColumn independently.

Configuration Options

p := progress.New(
    progress.WithConsole(customConsole),       // Custom console
    progress.WithRefreshRate(15),              // 15 Hz refresh (default: 10)
    progress.WithSpeedEstimatePeriod(60),      // 60s speed window (default: 30)
    progress.WithTransient(true),              // Clear display when done
    progress.WithDisable(true),                // Disable output (for CI)
)

Task Options

task := p.AddTask("Processing", &total,
    progress.TaskWithCompleted(50),           // Start at 50%
    progress.TaskWithVisible(false),          // Hidden initially
    progress.TaskWithStart(false),            // Don't start timer yet
    progress.TaskWithFields(map[string]any{   // Custom fields
        "filename": "data.csv",
    }),
)

// Control task timing
p.StartTask(task)   // Start the timer
p.StopTask(task)    // Pause the timer
p.ResetTask(task, true)  // Reset and restart

Tables

Create bordered tables with styled columns, markup cells, row formatting, footers, sections, flexible column widths, and 19 box styles.

package main

import (
    "github.com/depado/gorich/console"
    "github.com/depado/gorich/table"
)

func main() {
    c := console.New()

    tbl := table.NewTable("Name", "Age", "City")
    tbl.AddRow("Alice", "30", "New York")
    tbl.AddRow("Bob", "25", "San Francisco")
    tbl.AddRow("Charlie", "35", "London")
    c.Render(tbl)
}

Output:

┏━━━━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━┓
┃ Name    ┃ Age ┃ City          ┃
┡━━━━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━┩
│ Alice   │ 30  │ New York      │
│ Bob     │ 25  │ San Francisco │
│ Charlie │ 35  │ London        │
└─────────┴─────┴───────────────┘

Column Styling

tbl := table.NewTable()
tbl.AddColumn("Name", table.WithColumnStyle("bold"))
tbl.AddColumn("Age",  table.WithColumnStyle("yellow"), table.WithColumnJustify(console.JustifyCenter))
tbl.AddColumn("City", table.WithColumnStyle("italic"))

tbl.AddRow("[bold]Alice[/]", "30", "[blue]New York[/]")
tbl.AddRow("Bob", "25", "[blue]San Francisco[/]")

c.Render(tbl)

Footer, Sections & Box Styles

tbl := table.NewTableWithOptions(nil,
    table.WithShowFooter(true),
    table.WithBox(box.ROUNDED),
)
tbl.AddColumn("Task",   table.WithColumnStyle("bold"))
tbl.AddColumn("Status", table.WithColumnJustify(console.JustifyCenter))
tbl.AddRow("Setup project", "[green]Done[/]", "Alice")
tbl.AddSection()
tbl.AddRow("Code review",   "[dim]Pending[/]", "Bob")
c.Render(tbl)

Flexible Widths

tbl := table.NewTableWithOptions(nil, table.WithExpand())
tbl.AddColumn("Fixed",    table.WithColumnWidth(12))
tbl.AddColumn("Flex 2x",  table.WithColumnRatio(2))
tbl.AddColumn("Flex 1x",  table.WithColumnRatio(1))
c.Render(tbl)

For full table options see the API Reference section below.

Spinners

50+ built-in spinners from cli-spinners:

progress.NewSpinnerColumn(
    progress.WithSpinnerName("dots"),      // dots, line, star, moon, etc.
    progress.WithFinishedText("Done!"),    // Text when complete
)

Available spinners: dots, dots2, dots3, line, pipe, star, hamburger, growVertical, growHorizontal, balloon, noise, bounce, boxBounce, triangle, arc, circle, toggle, arrow, bouncingBar, bouncingBall, smiley, monkey, hearts, clock, earth, moon, runner, pong, shark, and more.

API Reference

Progress

// Create and start
p := progress.New(opts...)
p.Start(ctx)
defer p.Stop()

// Task management
taskID := p.AddTask(description, total, opts...)
p.Advance(taskID, amount)
p.Update(taskID, config)
p.Done(taskID, description...)  // Mark task as finished
p.RemoveTask(taskID)

// Sections (per-group column layouts)
section := p.AddSection(
    progress.WithSectionColumns(cols...),
    progress.WithSectionIndent(2),
)
taskID := section.AddTask(description, total, opts...)

// Task timing
p.StartTask(taskID)
p.StopTask(taskID)
p.ResetTask(taskID, start)

// State
p.Finished() bool  // All tasks complete?
p.Refresh()        // Force refresh

TaskUpdateConfig

p.Update(taskID, progress.TaskUpdateConfig{
    Description: &newDesc,
    Total:       &newTotal,
    Completed:   &newCompleted,
    Advance:     &advanceBy,
    Visible:     &isVisible,
    Fields:      map[string]any{"key": "value"},
})

Table

// Create a table
tbl := table.NewTable(headers ...string)
tbl := table.NewTableWithOptions(headers []string, opts ...TableOption)

// Add columns with options
col := tbl.AddColumn("Header",
    table.WithColumnStyle("bold cyan"),
    table.WithColumnJustify(console.JustifyRight),
    table.WithColumnWidth(20),
    table.WithColumnRatio(2),
)

// Add data rows
tbl.AddRow("cell1", "cell2")
tbl.AddStyledRow([]interface{}{"cell1", "cell2"}, style, endSection)
tbl.AddSection()

// Set footer (WithShowFooter must be true)
col.Footer = "Summary"

// Render
c.Render(tbl)

Table Options

table.NewTableWithOptions(headers,
    table.WithTitle("[bold]Title[/]"),
    table.WithCaption("Caption text"),
    table.WithWidth(80),
    table.WithBox(box.ROUNDED),      // Default: box.HEAVY_HEAD
    table.WithExpand(),              // Fill terminal width
    table.WithShowLines(),           // Dividers between all rows
    table.WithShowHeader(false),     // Hide header
    table.WithShowFooter(true),      // Show footer row
    table.WithShowEdge(false),       // Hide outer edges
    table.WithLeading(1),            // Blank lines between rows
    table.WithStyle(s),
    table.WithRowStyles(s1, s2),     // Alternating row styles
    table.WithHeaderStyle(s),
    table.WithFooterStyle(s),
    table.WithBorderStyle(s),
    table.WithPad(0, 1, 0, 1),      // top, right, bottom, left
    table.WithCollapsePadding(),
    table.WithPadEdge(false),
)

Styling

GoRich automatically detects terminal capabilities and uses the best available:

• Truecolor (24-bit) when COLORTERM=truecolor
• 256 colors when TERM contains 256color
• Standard 16 colors otherwise
• No color when NO_COLOR is set or output is not a terminal

Predefined Styles

Pre-defined style variables avoid the need to parse strings:

// Attribute styles (use with `&style.Bold`, etc.)
style.Bold      style.Dim       style.Italic
style.Underline style.Blink     style.Reverse
style.Strike    style.Conceal   style.Overline

// Color styles
style.Red     style.Green    style.Blue
style.Yellow  style.Cyan     style.Magenta
style.White   style.Black

Used with table/progress APIs that take *style.Style:

table.WithHeaderStyle(&style.Bold)
table.WithBorderStyle(&style.Cyan)

Progress Bar Colors

The progress bar automatically changes color based on state:

• In progress: Magenta
• Finished: Green (when task completes)
• Pulse animation: Purple gradient (for indeterminate tasks)

Thread Safety

All Progress methods are safe to call from multiple goroutines. Updates are protected by mutexes, and the display refresh happens in a separate goroutine.

Acknowledgments

• Rich by Will McGugan - The original Python library
• cli-spinners by Sindre Sorhus - Spinner definitions
• go-runewidth - Terminal cell width calculation

License

MIT License - see LICENSE file