package config
import (
"errors"
"fmt"
"os"
"path"
"regexp"
"strconv"
"strings"
"github.com/gdamore/tcell/v2"
"github.com/go-ini/ini"
"github.com/mitchellh/go-homedir"
)
type StyleObject int32
const (
STYLE_DEFAULT StyleObject = iota
STYLE_ERROR
STYLE_WARNING
STYLE_SUCCESS
STYLE_TITLE
STYLE_HEADER
STYLE_STATUSLINE_DEFAULT
STYLE_STATUSLINE_ERROR
STYLE_STATUSLINE_SUCCESS
STYLE_MSGLIST_DEFAULT
STYLE_MSGLIST_UNREAD
STYLE_MSGLIST_READ
STYLE_MSGLIST_FLAGGED
STYLE_MSGLIST_DELETED
STYLE_MSGLIST_MARKED
STYLE_DIRLIST_DEFAULT
STYLE_DIRLIST_UNREAD
STYLE_DIRLIST_RECENT
STYLE_COMPLETION_DEFAULT
STYLE_COMPLETION_GUTTER
STYLE_COMPLETION_PILL
STYLE_TAB
STYLE_STACK
STYLE_SPINNER
STYLE_BORDER
STYLE_SELECTOR_DEFAULT
STYLE_SELECTOR_FOCUSED
STYLE_SELECTOR_CHOOSER
)
var StyleNames = map[string]StyleObject{
"default": STYLE_DEFAULT,
"error": STYLE_ERROR,
"warning": STYLE_WARNING,
"success": STYLE_SUCCESS,
"title": STYLE_TITLE,
"header": STYLE_HEADER,
"statusline_default": STYLE_STATUSLINE_DEFAULT,
"statusline_error": STYLE_STATUSLINE_ERROR,
"statusline_success": STYLE_STATUSLINE_SUCCESS,
"msglist_default": STYLE_MSGLIST_DEFAULT,
"msglist_unread": STYLE_MSGLIST_UNREAD,
"msglist_read": STYLE_MSGLIST_READ,
"msglist_flagged": STYLE_MSGLIST_FLAGGED,
"msglist_deleted": STYLE_MSGLIST_DELETED,
"msglist_marked": STYLE_MSGLIST_MARKED,
"dirlist_default": STYLE_DIRLIST_DEFAULT,
"dirlist_unread": STYLE_DIRLIST_UNREAD,
"dirlist_recent": STYLE_DIRLIST_RECENT,
"completion_default": STYLE_COMPLETION_DEFAULT,
"completion_gutter": STYLE_COMPLETION_GUTTER,
"completion_pill": STYLE_COMPLETION_PILL,
"tab": STYLE_TAB,
"stack": STYLE_STACK,
"spinner": STYLE_SPINNER,
"border": STYLE_BORDER,
"selector_default": STYLE_SELECTOR_DEFAULT,
"selector_focused": STYLE_SELECTOR_FOCUSED,
"selector_chooser": STYLE_SELECTOR_CHOOSER,
}
type Style struct {
Fg tcell.Color
Bg tcell.Color
Bold bool
Blink bool
Underline bool
Reverse bool
}
func (s Style) Get() tcell.Style {
return tcell.StyleDefault.
Foreground(s.Fg).
Background(s.Bg).
Bold(s.Bold).
Blink(s.Blink).
Underline(s.Underline).
Reverse(s.Reverse)
}
func (s *Style) Normal() {
s.Bold = false
s.Blink = false
s.Underline = false
s.Reverse = false
}
func (s *Style) Default() *Style {
s.Fg = tcell.ColorDefault
s.Bg = tcell.ColorDefault
return s
}
func (s *Style) Reset() *Style {
s.Default()
s.Normal()
return s
}
func boolSwitch(val string, cur_val bool) (bool, error) {
switch val {
case "true":
return true, nil
case "false":
return false, nil
case "toggle":
return !cur_val, nil
default:
return cur_val, errors.New(
"Bool Switch attribute must be true, false, or toggle")
}
}
func extractColor(val string) tcell.Color {
// Check if the string can be interpreted as a number, indicating a
// reference to the color number. Otherwise retrieve the number based
// on the name.
if i, err := strconv.ParseUint(val, 10, 8); err == nil {
return tcell.PaletteColor(int(i))
} else {
return tcell.GetColor(val)
}
}
func (s *Style) Set(attr, val string) error {
switch attr {
case "fg":
s.Fg = extractColor(val)
case "bg":
s.Bg = extractColor(val)
case "bold":
if state, err := boolSwitch(val, s.Bold); err != nil {
return err
} else {
s.Bold = state
}
case "blink":
if state, err := boolSwitch(val, s.Blink); err != nil {
return err
} else {
s.Blink = state
}
case "underline":
if state, err := boolSwitch(val, s.Underline); err != nil {
return err
} else {
s.Underline = state
}
case "reverse":
if state, err := boolSwitch(val, s.Reverse); err != nil {
return err
} else {
s.Reverse = state
}
case "default":
s.Default()
case "normal":
s.Normal()
default:
return errors.New("Unknown style attribute: " + attr)
}
return nil
}
func (s Style) composeWith(styles []*Style) Style {
newStyle := s
for _, st := range styles {
if st.Fg != s.Fg {
newStyle.Fg = st.Fg
}
if st.Bg != s.Bg {
newStyle.Bg = st.Bg
}
if st.Bold != s.Bold {
newStyle.Bold = st.Bold
}
if st.Blink != s.Blink {
newStyle.Blink = st.Blink
}
if st.Underline != s.Underline {
newStyle.Underline = st.Underline
}
if st.Reverse != s.Reverse {
newStyle.Reverse = st.Reverse
}
}
return newStyle
}
type StyleSet struct {
objects map[StyleObject]*Style
selected map[StyleObject]*Style
}
func NewStyleSet() StyleSet {
ss := StyleSet{
objects: make(map[StyleObject]*Style),
selected: make(map[StyleObject]*Style),
}
for _, so := range StyleNames {
ss.objects[so] = new(Style)
ss.selected[so] = new(Style)
}
return ss
}
func (ss StyleSet) reset() {
for _, so := range StyleNames {
ss.objects[so].Reset()
ss.selected[so].Reset()
}
}
func (ss StyleSet) Get(so StyleObject) tcell.Style {
return ss.objects[so].Get()
}
func (ss StyleSet) Selected(so StyleObject) tcell.Style {
return ss.selected[so].Get()
}
func (ss StyleSet) Compose(so StyleObject, sos []StyleObject) tcell.Style {
base := *ss.objects[so]
styles := make([]*Style, len(sos))
for i, so := range sos {
styles[i] = ss.objects[so]
}
return base.composeWith(styles).Get()
}
func (ss StyleSet) ComposeSelected(so StyleObject,
sos []StyleObject,
) tcell.Style {
base := *ss.selected[so]
styles := make([]*Style, len(sos))
for i, so := range sos {
styles[i] = ss.selected[so]
}
return base.composeWith(styles).Get()
}
func findStyleSet(stylesetName string, stylesetsDir []string) (string, error) {
for _, dir := range stylesetsDir {
stylesetPath, err := homedir.Expand(path.Join(dir, stylesetName))
if err != nil {
return "", err
}
if _, err := os.Stat(stylesetPath); os.IsNotExist(err) {
continue
}
return stylesetPath, nil
}
return "", fmt.Errorf(
"Can't find styleset %q in any of %v", stylesetName, stylesetsDir)
}
func (ss *StyleSet) ParseStyleSet(file *ini.File) error {
ss.reset()
defaultSection, err := file.GetSection(ini.DefaultSection)
if err != nil {
return err
}
selectedKeys := []string{}
for _, key := range defaultSection.KeyStrings() {
tokens := strings.Split(key, ".")
var styleName, attr string
switch len(tokens) {
case 2:
styleName, attr = tokens[0], tokens[1]
case 3:
if tokens[1] != "selected" {
return errors.New("Unknown modifier: " + tokens[1])
}
selectedKeys = append(selectedKeys, key)
continue
default:
return errors.New("Style parsing error: " + key)
}
val := defaultSection.KeysHash()[key]
if strings.ContainsAny(styleName, "*?") {
regex := fnmatchToRegex(styleName)
for sn, so := range StyleNames {
matched, err := regexp.MatchString(regex, sn)
if err != nil {
return err
}
if !matched {
continue
}
if err := ss.objects[so].Set(attr, val); err != nil {
return err
}
if err := ss.selected[so].Set(attr, val); err != nil {
return err
}
}
} else {
so, ok := StyleNames[styleName]
if !ok {
return errors.New("Unknown style object: " + styleName)
}
if err := ss.objects[so].Set(attr, val); err != nil {
return err
}
if err := ss.selected[so].Set(attr, val); err != nil {
return err
}
}
}
for _, key := range selectedKeys {
tokens := strings.Split(key, ".")
styleName, modifier, attr := tokens[0], tokens[1], tokens[2]
if modifier != "selected" {
return errors.New("Unknown modifier: " + modifier)
}
val := defaultSection.KeysHash()[key]
if strings.ContainsAny(styleName, "*?") {
regex := fnmatchToRegex(styleName)
for sn, so := range StyleNames {
matched, err := regexp.MatchString(regex, sn)
if err != nil {
return err
}
if !matched {
continue
}
if err := ss.selected[so].Set(attr, val); err != nil {
return err
}
}
} else {
so, ok := StyleNames[styleName]
if !ok {
return errors.New("Unknown style object: " + styleName)
}
if err := ss.selected[so].Set(attr, val); err != nil {
return err
}
}
}
for _, key := range defaultSection.KeyStrings() {
tokens := strings.Split(key, ".")
styleName, attr := tokens[0], tokens[1]
val := defaultSection.KeysHash()[key]
if styleName != "selected" {
continue
}
for _, so := range StyleNames {
if err := ss.selected[so].Set(attr, val); err != nil {
return err
}
}
}
return nil
}
func (ss *StyleSet) LoadStyleSet(stylesetName string, stylesetDirs []string) error {
filepath, err := findStyleSet(stylesetName, stylesetDirs)
if err != nil {
return err
}
var options ini.LoadOptions
options.SpaceBeforeInlineComment = true
file, err := ini.LoadSources(options, filepath)
if err != nil {
return err
}
return ss.ParseStyleSet(file)
}
func fnmatchToRegex(pattern string) string {
n := len(pattern)
var regex strings.Builder
for i := 0; i < n; i++ {
switch pattern[i] {
case '*':
regex.WriteString(".*")
case '?':
regex.WriteByte('.')
default:
regex.WriteByte(pattern[i])
}
}
return regex.String()
}
