console-rendering

Console Rendering System Usage

Use this guide for the struct tag-based console rendering system.

Struct Tag Support

Use the console struct tag to control rendering behavior:

• header:"Name" - Sets the display name for fields (used in both structs and tables)
• title:"Section Title" - Sets the title for nested structs, slices, or maps
• format:"type" - Sets the formatting type for the field value
  • format:number - Formats integers as human-readable numbers (e.g., "1k", "1.2M")
  • format:cost - Formats floats as currency with $ prefix (e.g., "$1.234")
• omitempty - Skips the field if it has a zero value
• "-" - Always skips the field

Example Usage

type Overview struct {
    RunID    int64  `console:"header:Run ID"`
    Workflow string `console:"header:Workflow"`
    Status   string `console:"header:Status"`
    Duration string `console:"header:Duration,omitempty"`
}

data := Overview{
    RunID:    12345,
    Workflow: "test-workflow",
    Status:   "completed",
    Duration: "5m30s",
}

// Simple rendering
fmt.Print(console.RenderStruct(data))

// Output:
//   Run ID  : 12345
//   Workflow: test-workflow
//   Status  : completed
//   Duration: 5m30s

Format Tag Examples

Number Formatting

type Metrics struct {
    TokenUsage int `console:"header:Token Usage,format:number"`
    Errors     int `console:"header:Errors"`
}

data := Metrics{
    TokenUsage: 250000,
    Errors:     5,
}

// Renders as:
//   Token Usage: 250k
//   Errors     : 5

Cost Formatting

type Billing struct {
    Cost float64 `console:"header:Estimated Cost,format:cost"`
}

data := Billing{
    Cost: 1.234,
}

// Renders as:
//   Estimated Cost: $1.234

Rendering Behavior

Structs

Structs are rendered as key-value pairs with proper alignment.

Slices

Slices of structs are automatically rendered as tables:

type Job struct {
    Name       string `console:"header:Name"`
    Status     string `console:"header:Status"`
    Conclusion string `console:"header:Conclusion,omitempty"`
}

jobs := []Job{
    {Name: "build", Status: "completed", Conclusion: "success"},
    {Name: "test", Status: "in_progress", Conclusion: ""},
}

fmt.Print(console.RenderStruct(jobs))

Renders as:

Name  | Status      | Conclusion
----- | ----------- | ----------
build | completed   | success
test  | in_progress | -

Maps

Maps are rendered as markdown-style headers with key-value pairs.

Special Type Handling

time.Time

time.Time fields are automatically formatted as "2006-01-02 15:04:05". Zero time values are considered empty when used with omitempty.

Unexported Fields

The rendering system safely handles unexported struct fields by checking CanInterface() before attempting to access field values.