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themes.go
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themes.go
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package config
import (
"errors"
"github.com/rs/zerolog/log"
"gopkg.in/yaml.v3"
"os"
"path"
"slices"
)
const (
CustomStyleName = "Custom Style"
)
var (
errThemeNotFound = errors.New("custom theme not found")
)
// Themes represents a list of styles.
type Themes struct {
styles []*Styles
activeStyles *Styles
listeners []StyleListener
}
// ---------- THEMES ----------
func NewThemes() *Themes {
t := &Themes{
styles: make([]*Styles, 0),
activeStyles: NewStyles(),
}
files, err := themesFolder.ReadDir("themes")
if err == nil {
for _, file := range files {
fileName := path.Join("themes", file.Name())
b, err := themesFolder.ReadFile(fileName)
if err != nil {
log.Err(err).Msgf("Error reading files %s", fileName)
continue
}
s := &Styles{}
err = yaml.Unmarshal(b, s)
if err != nil {
log.Err(err).Msgf("Error parsing theme %s", fileName)
continue
}
t.styles = append(t.styles, s)
}
} else {
log.Err(err).Msg("Error reading themes folder")
}
custom, err := t.loadFromFile()
if err == nil {
t.styles = append(t.styles, custom)
}
return t
}
func (t *Themes) loadFromFile() (*Styles, error) {
filePath := GetThemesPath()
if filePath == "" || !fileExists(filePath) {
return nil, errThemeNotFound
}
b, err := os.ReadFile(filePath)
if err != nil {
log.Warn().Err(err).Msgf("Error reading themes file %s", filePath)
return nil, err
}
s := NewStyles()
err = yaml.Unmarshal(b, s)
if err != nil {
log.Err(err).Msgf("Error parsing theme %s", filePath)
return nil, err
}
s.Style.Name = CustomStyleName
return s, nil
}
func (t *Themes) SelectStyles(name string) {
if name == CustomStyleName {
t.SelectStylesFromFile()
return
}
changed := false
for _, styles := range t.styles {
if styles.Style.Name == name {
t.activeStyles = styles
changed = true
break
}
}
if changed {
t.activeStyles.Update()
t.fireStylesChanged()
} else {
log.Error().Msgf("Theme %s not found", name)
}
}
func (t *Themes) SelectStylesFromFile() {
custom, err := t.loadFromFile()
if err == nil {
t.activeStyles = custom
t.activeStyles.Update()
t.fireStylesChanged()
} else {
log.Err(err).Msgf("Failed to load custom theme from %s", GetThemesPath())
}
}
func (t *Themes) GetThemeNames() []string {
names := make([]string, 0)
for _, styles := range t.styles {
names = append(names, styles.Style.Name)
}
slices.Sort(names)
return names
}
// AddListener registers a new listener.
func (t *Themes) AddListener(l StyleListener) {
t.listeners = append(t.listeners, l)
}
// RemoveListener removes a listener.
func (t *Themes) RemoveListener(l StyleListener) {
victim := -1
for i, lis := range t.listeners {
if lis == l {
victim = i
break
}
}
if victim == -1 {
return
}
t.listeners = append(t.listeners[:victim], t.listeners[victim+1:]...)
}
// GetActiveStyles returns the active styles.
func (t *Themes) GetActiveStyles() *Styles {
return t.activeStyles
}
func (t *Themes) fireStylesChanged() {
for _, list := range t.listeners {
list.StylesChanged(t.activeStyles)
}
}