Send an event to the app event channel. If it fails, we swallow the error and log it.

Submit the `op` wrapped in a `Submission` with a unique ID.

--- Helpers for tests that need direct construction and event draining ---

Obtains a difference between the previous and the current buffer and passes it to the current backend for drawing.

Handle a key event coming from the main UI.

Height (terminal rows) required by the current bottom pane.

The area of the current frame This is guaranteed not to change during rendering, so may be called multiple times. If your app listens for a resize e

Returns the current frame count. This method provides access to the frame count, which is a sequence number indicating how many frames have been rend

Returns a default `Config` whose on-disk state is confined to the provided temporary directory. Using a per-test directory keeps tests hermetic and av

Built-in default provider list.

Push an input fragment. May contain newlines.

Returns a `ModelFamily` for the given model slug, or `None` if the slug does not match any known model family.

Returns true if the composer currently contains no user input.

Compute the on-screen cursor position taking scrolling into account.

Performs the initialization handshake with the MCP server.

Run a git command with a timeout to prevent blocking on large repositories

Truncate `text` to `max_graphemes` graphemes. Using graphemes to avoid accidentally truncating in the middle of a multi-codepoint character.

Recompute the aggregated unified diff by comparing all of the in-memory snapshots that were collected before the first time they were touched by apply

Compute the Git SHA-1 blob object ID for the given content (string). This delegates to the bytes version to avoid UTF-8 lossy conversions here.

Sets the viewport area.

Helper to construct a patch with the given body.

Adjust `scroll_top` so that the current `selected_idx` is visible within the window of `visible_rows`.

Front-run apply patch calls to track the starting contents of any modified files. - Creates an in-memory baseline snapshot for files that already exis

Convenience function over `padded_emoji()`.

Shorten a path to the last component, excluding `build`/`dist`/`node_modules`/`src`. It also pulls out a useful path from a directory such as: - webvi

Applies the patch and prints the result to stdout/stderr.

Simple case-insensitive subsequence matcher used for fuzzy filtering. Returns the indices (character positions) of the matched characters in the ORIG

Like `insert_history_lines`, but writes ANSI to the provided writer. This is intended for testing where a capture buffer is used instead of stdout.

Returns a list of OpenAiTools based on the provided config and MCP tools. Note that the keys of mcp_tools should be fully qualified names. See [`McpCo

Normalize pasted text that may represent a filesystem path. Supports: - `file://` URLs (converted to local paths) - Windows/UNC paths - shell-escaped

Format JSON text in a compact single-line format with spaces for better Ratatui wrapping. Ex: `{"a":"b",c:["d","e"]}` -> `{"a": "b", "c": ["d", "e"]}`

Combines `Config::instructions` and `AGENTS.md` (if present) into a single string of instructions.

Parse the raw strings captured from the CLI into a list of `(path, value)` tuples where `value` is a `serde_json::Value`.

Prepend root-level overrides so they have lower precedence than CLI-specific ones specified after the subcommand (if any).

Spawn a new [`Codex`] and initialize the session.

Build minimal SSE stream with completed marker using the JSON fixture.

Render the full buffer and return only the newly completed logical lines since the last commit. When the buffer does not end with a newline, the final

Helper that returns a `Config` pointing at `root` and using `limit` as the maximum number of bytes to embed from AGENTS.md. The caller can optionally