fix(app): implement ctrl-y yank for killed text in prompt

packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx

@@ -58,6 +58,8 @@ export type PromptRef = {
 const PLACEHOLDERS = ["Fix a TODO in the codebase", "What is the tech stack of this project?", "Fix broken tests"]
 const SHELL_PLACEHOLDERS = ["ls -la", "git status", "pwd"]
 
+let killRing = ""
+
 export function Prompt(props: PromptProps) {
   let input: TextareaRenderable
   let anchor: BoxRenderable
@@ -836,6 +838,29 @@ export function Prompt(props: PromptProps) {
                   e.preventDefault()
                   return
                 }
+                if (keybind.match("input_delete_to_line_end", e)) {
+                  const text = input.plainText
+                  const offset = input.cursorOffset
+                  const nextNewline = text.indexOf("\n", offset)
+                  const endOfLine = nextNewline === -1 ? text.length : nextNewline
+                  const killed = offset === endOfLine && nextNewline !== -1 ? "\n" : text.slice(offset, endOfLine)
+                  if (killed) killRing = killed
+                }
+                if (keybind.match("input_delete_to_line_start", e)) {
+                  const text = input.plainText
+                  const offset = input.cursorOffset
+                  const prevNewline = text.lastIndexOf("\n", offset - 1)
+                  const startOfLine = prevNewline === -1 ? 0 : prevNewline + 1
+                  const killed = text.slice(startOfLine, offset)
+                  if (killed) killRing = killed
+                }
+                if (keybind.match("input_yank", e)) {
+                  if (killRing) {
+                    input.insertText(killRing)
+                  }
+                  e.preventDefault()
+                  return
+                }
                 // Handle clipboard paste (Ctrl+V) - check for images first on Windows
                 // This is needed because Windows terminal doesn't properly send image data
                 // through bracketed paste, so we need to intercept the keypress and

packages/opencode/src/config/config.ts

@@ -880,6 +880,7 @@ export namespace Config {
       input_delete_line: z.string().optional().default("ctrl+shift+d").describe("Delete line in input"),
       input_delete_to_line_end: z.string().optional().default("ctrl+k").describe("Delete to end of line in input"),
       input_delete_to_line_start: z.string().optional().default("ctrl+u").describe("Delete to start of line in input"),
+      input_yank: z.string().optional().default("ctrl+y").describe("Yank killed text in input"),
       input_backspace: z.string().optional().default("backspace,shift+backspace").describe("Backspace in input"),
       input_delete: z.string().optional().default("ctrl+d,delete,shift+delete").describe("Delete character in input"),
       input_undo: z.string().optional().default("ctrl+-,super+z").describe("Undo in input"),

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -1295,6 +1295,10 @@ export type KeybindsConfig = {
    * Delete to start of line in input
    */
   input_delete_to_line_start?: string
+  /**
+   * Yank killed text in input
+   */
+  input_yank?: string
   /**
    * Backspace in input
    */

packages/sdk/openapi.json

@@ -9030,6 +9030,11 @@
             "default": "ctrl+u",
             "type": "string"
           },
+          "input_yank": {
+            "description": "Yank killed text in input",
+            "default": "ctrl+y",
+            "type": "string"
+          },
           "input_backspace": {
             "description": "Backspace in input",
             "default": "backspace,shift+backspace",