evalphobia/go-jp-text-ripper

package ripper

import (
    "fmt"
)

const (
    defaultTopNumber = 100
)

// RankConfig contains options for 'rank' command.
type RankConfig struct {
    CommonConfig

    // show ranking from the top N
    TopNumber int
    // show ranking from the top by percent
    TopPercent float64 // 0.0~1.0
    // show ranking from the last N
    LastNumber int
    // show ranking from the last by percent
    LastPercent float64 // 0.0~1.0

    // count as one word if the same word exists in a line.
    UseUnique bool
}

// Init initializes config.
func (c *RankConfig) Init() error {
    switch {
    case c.TopNumber > 0,
        c.TopPercent > 0,
        c.LastNumber > 0,
        c.LastPercent > 0:
        // pass
    default:
        c.TopNumber = defaultTopNumber
    }

    return c.CommonConfig.Init()
}

// Validate validates config.
func (c RankConfig) Validate() error {
    if err := c.CommonConfig.Validate(); err != nil {
        return err
    }

    if c.Output == "" && !c.ShowResult {
        return fmt.Errorf("no output file\nSet -output <output file path> (or set -show option)")
    }
    return nil
}