omissis/goarkitect

package expect

import (
    "fmt"
    "path/filepath"

    "github.com/omissis/goarkitect/internal/arch/rule"
)

func StartWith(prefix string, opts ...Option) *startWithExpression {
    expr := &startWithExpression{
        prefix: prefix,
    }

    expr.applyOptions(opts)

    return expr
}

type startWithExpression struct {
    baseExpression

    prefix string
}

func (e startWithExpression) Evaluate(rb rule.Builder) []rule.CoreViolation {
    return e.evaluate(rb, e.doEvaluate, e.getViolation)
}

func (e startWithExpression) doEvaluate(rb rule.Builder, filePath string) bool {
    fileName := filepath.Base(filePath)

    le := len(e.prefix)
    lf := len(fileName)

    return le <= lf && fileName[:le] != e.prefix
}

func (e startWithExpression) getViolation(filePath string) rule.CoreViolation {
    format := "file's name '%s' does not start with '%s'"
    if e.options.negated {
        format = "file's name '%s' does start with '%s'"
    }

    return rule.NewCoreViolation(
        fmt.Sprintf(format, filepath.Base(filePath), e.prefix),
    )
}