add-feature-flag

Add a new feature flag to gate code changes in the Warp codebase.

Overview

Feature flags in Warp are compile-time flags that allow features to be selectively enabled for different channels (e.g.: Dev, Stable). They use a small runtime plumbing layer that checks if a flag is enabled.

TUI note

The FeatureFlag enum (warp_core/src/features.rs) and the runtime FeatureFlag::X.is_enabled() check are SHARED by both front-ends: the GUI desktop app (app/) and the headless TUI (crates/warp_tui). The Cargo-feature steps in this skill (app/Cargo.toml, app/src/lib.rs) are GUI-app-specific. Prefer runtime is_enabled() checks so a flag works in both front-ends with no per-binary wiring. Only if you truly need a compile-time Cargo feature in the TUI, wire it into crates/warp_tui/Cargo.toml as well. Test the TUI with ./script/run-tui.

Steps

1. Add to Cargo.toml

Add the feature to app/Cargo.toml under the [features] section, but NOT under the default nested stanza: