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// theme.go — Zed theme JSON in, CSS custom properties out. Per-agent colors
// come from the theme's player (collaborator) palette.
package main
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
)
type SyntaxStyle struct {
Color string `json:"color"`
FontStyle *string `json:"font_style"`
FontWeight *float64 `json:"font_weight"`
}
type Theme struct {
Name, Appearance string
Bg, Fg, Panel, Border, LineNo, Muted, Accent string
Note, Hover string
Syntax map[string]SyntaxStyle
Players []string
}
// defaultTheme finds a zed theme file containing a theme of the wanted
// appearance; "" means fall back to the embedded One family.
func defaultTheme(appearance string) string {
home, _ := os.UserHomeDir()
m, _ := filepath.Glob(filepath.Join(home, ".config", "zed", "themes", "*.json"))
for _, path := range m {
b, err := os.ReadFile(path)
if err != nil {
continue
}
var family struct {
Themes []struct {
Appearance string `json:"appearance"`
} `json:"themes"`
}
if json.Unmarshal(b, &family) != nil {
continue
}
for _, t := range family.Themes {
if t.Appearance == appearance {
return path
}
}
}
return ""
}
func loadTheme(path, name, appearance string) *Theme {
var b []byte
var err error
if path == "" {
b, err = tfs.ReadFile("assets/one.json")
} else {
b, err = os.ReadFile(path)
}
if err != nil {
fatal("%v", err)
}
var family struct {
Name string `json:"name"`
Themes []struct {
Name string `json:"name"`
Appearance string `json:"appearance"`
Style map[string]json.RawMessage `json:"style"`
} `json:"themes"`
}
if err := json.Unmarshal(b, &family); err != nil || len(family.Themes) == 0 {
fatal("bad zed theme %s: %v", path, err)
}
th := family.Themes[0]
if name != "" {
for _, t := range family.Themes {
if t.Name == name {
th = t
}
}
} else {
for _, t := range family.Themes {
if t.Appearance == appearance {
th = t
break
}
}
}
get := func(keys ...string) string {
for _, k := range keys {
var s string
if raw, ok := th.Style[k]; ok && json.Unmarshal(raw, &s) == nil && s != "" {
return s
}
}
return ""
}
t := &Theme{Name: th.Name, Appearance: th.Appearance,
Bg: get("editor.background", "background"),
Fg: get("editor.foreground", "text"),
Panel: get("panel.background", "surface.background", "background"),
Border: get("border", "border.variant"),
LineNo: get("editor.line_number"),
Muted: get("text.muted", "text.disabled"),
Accent: get("text.accent", "info"),
Note: get("warning", "conflict", "modified"),
Hover: get("element.hover", "ghost_element.hover"),
}
json.Unmarshal(th.Style["syntax"], &t.Syntax)
var players []struct {
Cursor string `json:"cursor"`
}
json.Unmarshal(th.Style["players"], &players)
// agent colors: drop player colors that vanish against fg/bg or collide
// with the note color, then order greedily for mutual distance so the
// first few agents contrast most
var usable []string
for _, p := range players {
c := hex6(p.Cursor)
if c != "" && colorDist(c, hex6(t.Fg)) > 60 && colorDist(c, hex6(t.Bg)) > 60 && colorDist(c, hex6(t.Note)) > 60 {
usable = append(usable, c)
}
}
for len(usable) > 0 {
best, bestScore := 0, -1
for i, c := range usable {
score := 1 << 24 // first pick: keep theme order
for _, p := range t.Players {
if d := colorDist(c, p); d < score {
score = d
}
}
if score > bestScore {
best, bestScore = i, score
}
}
t.Players = append(t.Players, usable[best])
usable = append(usable[:best], usable[best+1:]...)
}
return t
}
func colorDist(a, b string) int {
var ar, ag, ab, br, bg, bb int
if len(a) != 7 || len(b) != 7 {
return 1 << 24
}
fmt.Sscanf(a[1:], "%02x%02x%02x", &ar, &ag, &ab)
fmt.Sscanf(b[1:], "%02x%02x%02x", &br, &bg, &bb)
d := func(x, y int) int { return (x - y) * (x - y) }
return int(float64(d(ar, br)+d(ag, bg)+d(ab, bb)) / 3)
}
var fallbackPalette = []string{"#7aa2f7", "#e0af68", "#9ece6a", "#f7768e", "#bb9af7", "#2ac3de"}
func (t *Theme) Player(i int) string {
if i < len(t.Players) {
return t.Players[i]
}
return fallbackPalette[i%len(fallbackPalette)]
}
// hex6 strips an alpha channel from #rrggbbaa.
func hex6(c string) string {
if len(c) == 9 && c[0] == '#' {
return c[:7]
}
return c
}
func mixColors(cols []string) string {
if len(cols) == 1 {
return cols[0]
}
var r, g, b int
n := 0
for _, c := range cols {
c = hex6(c)
if len(c) != 7 {
continue
}
var cr, cg, cb int
fmt.Sscanf(c[1:], "%02x%02x%02x", &cr, &cg, &cb)
r += cr
g += cg
b += cb
n++
}
if n == 0 {
return "#888888"
}
return fmt.Sprintf("#%02x%02x%02x", r/n, g/n, b/n)
}
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