fix(tui): improve clipboard copy fallbacks

ui-tui/src/__tests__/clipboard.test.ts

@@ -100,11 +100,22 @@ describe('isUsableClipboardText', () => {
 })
 
 describe('writeClipboardText', () => {
-  it('does nothing off macOS', async () => {
-    const start = vi.fn()
+  it('does nothing off macOS when no tools are available', async () => {
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          cb(1) // non-zero exit = failure
+        }
 
-    await expect(writeClipboardText('hello', 'linux', start)).resolves.toBe(false)
-    expect(start).not.toHaveBeenCalled()
+        return child
+      }),
+      stdin: { end: vi.fn() }
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    // Linux with no WAYLAND_DISPLAY / no WSL_INTEROP — falls through xclip then xsel, both fail
+    await expect(writeClipboardText('hello', 'linux', start, {})).resolves.toBe(false)
   })
 
   it('writes text to pbcopy on macOS', async () => {
@@ -148,4 +159,171 @@ describe('writeClipboardText', () => {
 
     await expect(writeClipboardText('hello world', 'darwin', start as any)).resolves.toBe(false)
   })
+
+  it('uses wl-copy on Wayland Linux', async () => {
+    const stdin = { end: vi.fn() }
+
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          cb(0)
+        }
+
+        return child
+      }),
+      stdin
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(
+      writeClipboardText('wayland text', 'linux', start as any, { WAYLAND_DISPLAY: 'wayland-1' })
+    ).resolves.toBe(true)
+    expect(start).toHaveBeenCalledWith(
+      'wl-copy',
+      ['--type', 'text/plain'],
+      expect.objectContaining({ stdio: ['pipe', 'ignore', 'ignore'], windowsHide: true })
+    )
+    expect(stdin.end).toHaveBeenCalledWith('wayland text')
+  })
+
+  it('falls back to xclip when wl-copy fails on Wayland', async () => {
+    let callCount = 0
+    const stdin = { end: vi.fn() }
+
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          callCount++
+          // wl-copy fails, xclip succeeds
+          cb(callCount === 1 ? 1 : 0)
+        }
+
+        return child
+      }),
+      stdin
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(
+      writeClipboardText('x11 text', 'linux', start as any, { WAYLAND_DISPLAY: 'wayland-1' })
+    ).resolves.toBe(true)
+    expect(start).toHaveBeenNthCalledWith(
+      1,
+      'wl-copy',
+      ['--type', 'text/plain'],
+      expect.anything()
+    )
+    expect(start).toHaveBeenNthCalledWith(
+      2,
+      'xclip',
+      ['-selection', 'clipboard', '-in'],
+      expect.anything()
+    )
+  })
+
+  it('falls back to xsel when both wl-copy and xclip fail', async () => {
+    let callCount = 0
+    const stdin = { end: vi.fn() }
+
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          callCount++
+          cb(callCount < 3 ? 1 : 0) // first two fail, third (xsel) succeeds
+        }
+
+        return child
+      }),
+      stdin
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(
+      writeClipboardText('xsel text', 'linux', start as any, { WAYLAND_DISPLAY: 'wayland-1' })
+    ).resolves.toBe(true)
+    expect(start).toHaveBeenNthCalledWith(3, 'xsel', ['--clipboard', '--input'], expect.anything())
+  })
+
+  it('uses PowerShell on WSL2 when WSL_DISTRO_NAME is set', async () => {
+    const stdin = { end: vi.fn() }
+
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          cb(0)
+        }
+
+        return child
+      }),
+      stdin
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(writeClipboardText('wsl text', 'linux', start as any, { WSL_DISTRO_NAME: 'Ubuntu' })).resolves.toBe(true)
+    expect(start).toHaveBeenCalledWith(
+      'powershell.exe',
+      expect.arrayContaining(['-NoProfile', '-NonInteractive']),
+      expect.anything()
+    )
+    expect(stdin.end).toHaveBeenCalledWith('wsl text')
+  })
+
+  it('prefers the Windows clipboard path over wl-copy inside WSLg', async () => {
+    const stdin = { end: vi.fn() }
+
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          cb(0)
+        }
+
+        return child
+      }),
+      stdin
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(
+      writeClipboardText('wslg text', 'linux', start as any, {
+        WAYLAND_DISPLAY: 'wayland-0',
+        WSL_DISTRO_NAME: 'Ubuntu'
+      })
+    ).resolves.toBe(true)
+    expect(start).toHaveBeenNthCalledWith(
+      1,
+      'powershell.exe',
+      expect.arrayContaining(['-NoProfile', '-NonInteractive']),
+      expect.anything()
+    )
+    expect(stdin.end).toHaveBeenCalledWith('wslg text')
+  })
+
+  it('uses PowerShell on Windows', async () => {
+    const stdin = { end: vi.fn() }
+
+    const child = {
+      once: vi.fn((event: string, cb: (code?: number) => void) => {
+        if (event === 'close') {
+          cb(0)
+        }
+
+        return child
+      }),
+      stdin
+    }
+
+    const start = vi.fn().mockReturnValue(child)
+
+    await expect(writeClipboardText('windows text', 'win32', start as any)).resolves.toBe(true)
+    expect(start).toHaveBeenCalledWith(
+      'powershell',
+      expect.arrayContaining(['-NoProfile', '-NonInteractive']),
+      expect.anything()
+    )
+  })
 })

ui-tui/src/app/slash/commands/core.ts

@@ -10,6 +10,7 @@ import type {
   SessionTitleResponse,
   SessionUndoResponse
 } from '../../../gatewayTypes.js'
+import { writeClipboardText } from '../../../lib/clipboard.js'
 import { writeOsc52Clipboard } from '../../../lib/osc52.js'
 import { configureDetectedTerminalKeybindings, configureTerminalKeybindings } from '../../../lib/terminalSetup.js'
 import type { Msg, PanelSection } from '../../../types.js'
@@ -318,10 +319,27 @@ export const coreCommands: SlashCommand[] = [
       const target = all[arg ? Math.min(parseInt(arg, 10), all.length) - 1 : all.length - 1]
 
       if (!target) {
-        return sys('nothing to copy')
+        return sys('nothing to copy — start a conversation first')
       }
 
-      writeOsc52Clipboard(target.text)
+      void writeClipboardText(target.text)
+        .then(nativeOk => {
+          if (ctx.stale()) {
+            return
+          }
+
+          if (nativeOk) {
+            sys('copied to clipboard')
+          } else {
+            writeOsc52Clipboard(target.text)
+            sys('sent OSC52 copy sequence (terminal support required)')
+          }
+        })
+        .catch(error => {
+          if (!ctx.stale()) {
+            sys(`copy failed: ${String(error)}`)
+          }
+        })
     }
   },
 

ui-tui/src/lib/clipboard.ts

@@ -44,7 +44,7 @@ function readClipboardCommands(
 
   const attempts: Array<{ args: readonly string[]; cmd: string }> = []
 
-  if (env.WSL_INTEROP) {
+  if (env.WSL_INTEROP || env.WSL_DISTRO_NAME) {
     attempts.push({ cmd: 'powershell.exe', args: POWERSHELL_ARGS })
   }
 
@@ -91,32 +91,76 @@ export async function readClipboardText(
   return null
 }
 
+function writeClipboardCommands(
+  platform: NodeJS.Platform,
+  env: NodeJS.ProcessEnv
+): Array<{ args: readonly string[]; cmd: string }> {
+  if (platform === 'darwin') {
+    return [{ cmd: 'pbcopy', args: [] }]
+  }
+
+  if (platform === 'win32') {
+    return [{ cmd: 'powershell', args: ['-NoProfile', '-NonInteractive', '-Command', 'Set-Clipboard -Value $input'] }]
+  }
+
+  const attempts: Array<{ args: readonly string[]; cmd: string }> = []
+
+  if (env.WSL_INTEROP || env.WSL_DISTRO_NAME) {
+    attempts.push({
+      cmd: 'powershell.exe',
+      args: ['-NoProfile', '-NonInteractive', '-Command', 'Set-Clipboard -Value $input']
+    })
+  }
+
+  if (env.WAYLAND_DISPLAY) {
+    attempts.push({ cmd: 'wl-copy', args: ['--type', 'text/plain'] })
+  }
+
+  attempts.push({ cmd: 'xclip', args: ['-selection', 'clipboard', '-in'] })
+  attempts.push({ cmd: 'xsel', args: ['--clipboard', '--input'] })
+
+  return attempts
+}
+
 /**
  * Write plain text to the system clipboard.
  *
- * On macOS this uses `pbcopy`. On other platforms we intentionally return
- * false for now; non-mac copy still falls back to OSC52.
+ * Tries native platform tools in fallback order:
+ * - macOS: pbcopy
+ * - Windows: PowerShell Set-Clipboard
+ * - WSL: powershell.exe Set-Clipboard
+ * - Linux Wayland: wl-copy --type text/plain
+ * - Linux X11: xclip -selection clipboard -in
+ * - Linux X11 alt: xsel --clipboard --input
+ *
+ * Returns true if at least one backend succeeded, false otherwise
+ * (callers should fall back to OSC52 on false).
  */
 export async function writeClipboardText(
   text: string,
   platform: NodeJS.Platform = process.platform,
-  start: typeof spawn = spawn
+  start: typeof spawn = spawn,
+  env: NodeJS.ProcessEnv = process.env
 ): Promise<boolean> {
-  if (platform !== 'darwin') {
-    return false
+  const candidates = writeClipboardCommands(platform, env)
+
+  for (const { cmd, args } of candidates) {
+    try {
+      const ok = await new Promise<boolean>(resolve => {
+        const child = start(cmd, [...args], { stdio: ['pipe', 'ignore', 'ignore'], windowsHide: true })
+
+        child.once('error', () => resolve(false))
+        child.once('close', code => resolve(code === 0))
+        child.stdin?.end(text)
+      })
+
+      if (ok) {
+        return true
+      }
+    } catch {
+      // Fall through to the next clipboard backend.
+    }
   }
 
-  try {
-    const ok = await new Promise<boolean>(resolve => {
-      const child = start('pbcopy', [], { stdio: ['pipe', 'ignore', 'ignore'], windowsHide: true })
-
-      child.once('error', () => resolve(false))
-      child.once('close', code => resolve(code === 0))
-      child.stdin.end(text)
-    })
-
-    return ok
-  } catch {
-    return false
-  }
+  return false
 }