glance/internal/feed/utils.go

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package feed
import (
"errors"
"fmt"
"net/url"
"slices"
"strings"
)
var (
ErrNoContent = errors.New("failed to retrieve any content")
ErrPartialContent = errors.New("failed to retrieve some of the content")
)
func percentChange(current, previous float64) float64 {
return (current/previous - 1) * 100
}
func extractDomainFromUrl(u string) string {
if u == "" {
return ""
}
parsed, err := url.Parse(u)
if err != nil {
return ""
}
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return strings.TrimPrefix(strings.ToLower(parsed.Host), "www.")
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}
func SvgPolylineCoordsFromYValues(width float64, height float64, values []float64) string {
if len(values) < 2 {
return ""
}
verticalPadding := height * 0.02
height -= verticalPadding * 2
coordinates := make([]string, len(values))
distanceBetweenPoints := width / float64(len(values)-1)
min := slices.Min(values)
max := slices.Max(values)
for i := range values {
coordinates[i] = fmt.Sprintf(
"%.2f,%.2f",
float64(i)*distanceBetweenPoints,
((max-values[i])/(max-min))*height+verticalPadding,
)
}
return strings.Join(coordinates, " ")
}
func maybeCopySliceWithoutZeroValues[T int | float64](values []T) []T {
if len(values) == 0 {
return values
}
for i := range values {
if values[i] != 0 {
continue
}
c := make([]T, 0, len(values)-1)
for i := range values {
if values[i] != 0 {
c = append(c, values[i])
}
}
return c
}
return values
}