javaup

jup is a command-line tool for managing Java versions.

Development

Run the complete local build pipeline:

go run build.go

The script stops on the first failure and runs these stages in order:

go fmt ./...
go vet ./...
go tool -modfile=golangci-lint.mod golangci-lint run
go test ./...
go tool -modfile=govulncheck.mod govulncheck ./...
go build -trimpath -o dist/<binary> ./cmd/jup

GolangCI-Lint and govulncheck are pinned in isolated Go module files, so no global tool installation is required and their dependencies do not affect the application module. Linter selection is defined in .golangci.yml. The resulting executable is written to dist.

Build output uses colors when stdout is an interactive terminal. Set JUP_BUILD_COLOR=always or JUP_BUILD_COLOR=never to override detection; setting NO_COLOR also disables colors in automatic mode. Color rendering is provided by github.com/fatih/color for cross-platform terminal support.

Inject a release version at build time:

go build -ldflags "-X github.com/codeboyzhou/javaup/internal/buildinfo.Version=v1.0.0 -X github.com/codeboyzhou/javaup/internal/buildinfo.Commit=<commit-hash>" -o jup ./cmd/jup

When Commit is not explicitly injected, jup uses the VCS revision embedded by the Go toolchain. Version output includes its first 12 characters:

javaup version v0.1.0 windows/amd64 (64c2fb07bcad)

Commands

jup help [command]
jup version

The standard --help, -h, --version, and -v flags are also supported.

Project structure

.golangci.yml       lint policy and enabled analyzers
build.go            local verification and build pipeline
cmd/jup/            executable entry point
golangci-lint.mod   isolated GolangCI-Lint dependencies
govulncheck.mod     isolated govulncheck dependencies
internal/buildinfo/ build-time version metadata
internal/cli/       Cobra command tree and built-in commands

Each command has its own constructor in internal/cli and is registered by the root command. Command handlers should only parse input and render output; reusable business logic belongs in a separate package under internal and is passed into command constructors as a dependency.