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opencode/specs/15-prompt-input-modularization.md

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+## Prompt input split
+
+Modularize `prompt-input.tsx` without behavior changes
+
+---
+
+### Summary
+
+`packages/app/src/components/prompt-input.tsx` is a very large component that combines editor DOM parsing, popovers, history, drag/drop + paste uploads, worktree/session creation, optimistic messages, and send/abort flow. This spec splits it into focused modules so future changes are safer.
+
+---
+
+### Goals
+
+- Reduce `prompt-input.tsx` complexity and file size
+- Extract cohesive logic into testable hooks/helpers
+- Keep runtime behavior and UX unchanged
+
+---
+
+### Non-goals
+
+- Replacing contenteditable editor approach
+- Major UX redesign of composer controls
+- API contract changes for prompt submission
+
+---
+
+### Parallel execution contract
+
+This spec owns:
+
+- `packages/app/src/components/prompt-input.tsx`
+- New files under `packages/app/src/components/prompt-input/*`
+
+This spec should not modify:
+
+- `packages/app/src/pages/session.tsx`
+- `packages/app/src/context/prompt.tsx` (except minor type-only imports if needed)
+
+---
+
+### Implementation plan
+
+1. Extract editor DOM helpers
+
+- Move pure DOM/selection helpers into `prompt-input/editor-dom.ts`:
+  - `createTextFragment`
+  - `getNodeLength`
+  - `getTextLength`
+  - cursor get/set helpers
+
+2. Extract history controller
+
+- Move prompt history read/write/navigation logic into `prompt-input/history.ts` hook.
+- Keep existing persisted keys and history semantics unchanged.
+
+3. Extract attachment interactions
+
+- Move image/file paste + drag/drop + file-input attachment flows to `prompt-input/attachments.ts` hook.
+
+4. Extract submit pipeline
+
+- Move send/abort/optimistic message pipeline to `prompt-input/submit.ts` service/hook.
+- Keep existing error toasts, worktree handling, and rollback behavior.
+
+5. Keep composition shell stable
+
+- `PromptInput` component remains the integration shell that wires hooks + JSX.
+- Preserve exported component API and props.
+
+---
+
+### Acceptance criteria
+
+- `prompt-input.tsx` becomes primarily orchestration + view code.
+- Extracted modules contain the heavy imperative logic.
+- All existing behaviors remain intact:
+  - slash and @ popovers
+  - history up/down navigation
+  - image attach/paste/drag-drop
+  - shell mode submit/abort
+  - optimistic message + rollback on failure
+
+---
+
+### Validation plan
+
+- Manual regression checklist:
+  - type prompt, submit, stop, retry
+  - use `/` command selection and `@` selector
+  - history navigation with arrows
+  - paste image, drag image, remove attachment
+  - start in new session + worktree create path
+  - failure path restores prompt and context comments
+
+---
+
+### Risks and mitigations
+
+- Risk: subtle ordering changes in submit rollback logic.
+  - Mitigation: migrate logic mechanically first, then cleanup.
+- Risk: editor selection bugs after helper extraction.
+  - Mitigation: keep existing cursor helpers unchanged and add focused manual checks.