refactor: share TUI terminal background detection (#22297)

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -1,6 +1,7 @@
 import { render, TimeToFirstDraw, useKeyboard, useRenderer, useTerminalDimensions } from "@opentui/solid"
 import { Clipboard } from "@tui/util/clipboard"
 import { Selection } from "@tui/util/selection"
+import { Terminal } from "@tui/util/terminal"
 import { createCliRenderer, MouseButton, type CliRendererConfig } from "@opentui/core"
 import { RouteProvider, useRoute } from "@tui/context/route"
 import {
@@ -60,66 +61,6 @@ import { TuiConfig } from "@/config/tui"
 import { createTuiApi, TuiPluginRuntime, type RouteMap } from "./plugin"
 import { FormatError, FormatUnknownError } from "@/cli/error"
 
-async function getTerminalBackgroundColor(): Promise<"dark" | "light"> {
-  // can't set raw mode if not a TTY
-  if (!process.stdin.isTTY) return "dark"
-
-  return new Promise((resolve) => {
-    let timeout: NodeJS.Timeout
-
-    const cleanup = () => {
-      process.stdin.setRawMode(false)
-      process.stdin.removeListener("data", handler)
-      clearTimeout(timeout)
-    }
-
-    const handler = (data: Buffer) => {
-      const str = data.toString()
-      const match = str.match(/\x1b]11;([^\x07\x1b]+)/)
-      if (match) {
-        cleanup()
-        const color = match[1]
-        // Parse RGB values from color string
-        // Formats: rgb:RR/GG/BB or #RRGGBB or rgb(R,G,B)
-        let r = 0,
-          g = 0,
-          b = 0
-
-        if (color.startsWith("rgb:")) {
-          const parts = color.substring(4).split("/")
-          r = parseInt(parts[0], 16) >> 8 // Convert 16-bit to 8-bit
-          g = parseInt(parts[1], 16) >> 8 // Convert 16-bit to 8-bit
-          b = parseInt(parts[2], 16) >> 8 // Convert 16-bit to 8-bit
-        } else if (color.startsWith("#")) {
-          r = parseInt(color.substring(1, 3), 16)
-          g = parseInt(color.substring(3, 5), 16)
-          b = parseInt(color.substring(5, 7), 16)
-        } else if (color.startsWith("rgb(")) {
-          const parts = color.substring(4, color.length - 1).split(",")
-          r = parseInt(parts[0])
-          g = parseInt(parts[1])
-          b = parseInt(parts[2])
-        }
-
-        // Calculate luminance using relative luminance formula
-        const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255
-
-        // Determine if dark or light based on luminance threshold
-        resolve(luminance > 0.5 ? "light" : "dark")
-      }
-    }
-
-    process.stdin.setRawMode(true)
-    process.stdin.on("data", handler)
-    process.stdout.write("\x1b]11;?\x07")
-
-    timeout = setTimeout(() => {
-      cleanup()
-      resolve("dark")
-    }, 1000)
-  })
-}
-
 import type { EventSource } from "./context/sdk"
 import { DialogVariant } from "./component/dialog-variant"
 
@@ -178,7 +119,7 @@ export function tui(input: {
     const unguard = win32InstallCtrlCGuard()
     win32DisableProcessedInput()
 
-    const mode = await getTerminalBackgroundColor()
+    const mode = await Terminal.getTerminalBackgroundColor()
 
     // Re-clear after getTerminalBackgroundColor() — setRawMode(false) restores
     // the original console mode which re-enables ENABLE_PROCESSED_INPUT.