Conditionals

Basic If/Else

task install:
    @if env(CI)
        npm ci
    @else
        npm install
    @end

If/Elif/Else

task deploy:
    @if env(PRODUCTION)
        echo "Deploying to production"
    @elif env(STAGING)
        echo "Deploying to staging"
    @else
        echo "Deploying to development"
    @end

Condition Functions

Function	Description
`env(VAR)`	True if environment variable is set and non-empty
`exists(path)`	True if file or directory exists
`eq(a, b)`	True if strings are equal
`neq(a, b)`	True if strings are not equal
`is_watching()`	True if running in watch mode (`-w`)
`is_dry_run()`	True if running in dry-run mode (`-n`)
`is_verbose()`	True if running in verbose mode (`-v`)

Runtime State Conditions

Check how jake was invoked:

task build:
    @if is_watching()
        echo "Watch mode: skipping expensive lint"
    @else
        npm run lint
    @end
    npm run build

task deploy:
    @if is_dry_run()
        echo "[DRY RUN] Would deploy to production"
    @else
        rsync dist/ server:/var/www/
    @end

task test:
    @if is_verbose()
        npm test -- --verbose
    @else
        npm test
    @end

File Existence

task setup:
    @if exists(node_modules)
        echo "Dependencies already installed"
    @else
        npm install
    @end

String Comparison

task build:
    @if eq($BUILD_MODE, "release")
        cargo build --release
    @else
        cargo build
    @end