feat(tui): Set TURBO_IS_TUI environment variable when using TUI.

[anthonyshew]

Description

Tools being used inside Turborepo tasks may want to know if they are being ran in our multiplexer, similar to the way other terminal tooling set environment variables that other programs can read (e.g. ZSH,TMUX, ALACRITTY_WINDOW_ID).

In this PR, we're exposing a TURBO_IS_TUI variable for this purpose.

Testing Instructions

Using the with-shell-commands example, I edited one of the build scripts to echo the value.

With TUI:

TURBO_UI devturbo build --force --skip-infer

<omitted for brevity>

┌ pkg-b#build > cache bypass, force executing 33b029c222753bd2
│
│
│ > pkg-b@ prebuild /Users/anthonyshew/projects/debugs/with-shell-commands/packages/pkg-b
│ > echo "Executing pre-build step..."
│
│ Executing pre-build step...
│
│ > pkg-b@ build /Users/anthonyshew/projects/debugs/with-shell-commands/packages/pkg-b
│ > echo $TURBO_IS_TUI
│
│ true
└────>

Without TUI:

TURBO_UI=0 devturbo build --force --skip-infer --filter=pkg-b
turbo 2.0.11

• Packages in scope: pkg-b
• Running build in 1 packages
• Remote caching disabled

pkg-b:prebuild: > echo "Executing pre-build step..."
pkg-b:prebuild:
pkg-b:prebuild: Executing pre-build step...
pkg-b:build: cache bypass, force executing 33b029c222753bd2
pkg-b:build:
pkg-b:build:
pkg-b:build: > pkg-b@ prebuild /Users/anthonyshew/projects/debugs/with-shell-commands/packages/pkg-b
pkg-b:build: > echo "Executing pre-build step..."
pkg-b:build:
pkg-b:build: Executing pre-build step...
pkg-b:build:
pkg-b:build: > pkg-b@ build /Users/anthonyshew/projects/debugs/with-shell-commands/packages/pkg-b
pkg-b:build: > echo $TURBO_IS_TUI
pkg-b:build:
pkg-b:build:

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[github-actions]

🟢 Turbopack Benchmark CI successful 🟢

Thanks

[github-actions]

🟢 CI successful 🟢

Thanks

[thdxr]

LGTM

[arlyon]

Approving but what is the purpose of the grep file?

[anthonyshew]

@arlyon Oops, I was doing stuff and used a > instead of | at some point. Fixed in #8903