env GO111MODULE=on

# This script tests commands in module mode outside of any module.
#
# First, ensure that we really are in module mode, and that we really don't have
# a go.mod file.
go env GOMOD
stdout 'NUL|/dev/null'


# 'go list' without arguments implicitly operates on the current directory,
# which is not in a module.
! go list
stderr 'cannot find main module'
! go list -m
stderr 'cannot find main module'
# 'go list' in the working directory should fail even if there is a a 'package
# main' present: without a main module, we do not know its package path.
! go list ./foo
stderr 'cannot find main module'

# 'go list all' lists the transitive import graph of the main module,
# which is empty if there is no main module.
go list all
! stdout .
stderr 'warning: "all" matched no packages'
go list -m all
stderr 'warning: pattern "all" matched no module dependencies'

# 'go list' on standard-library packages should work, since they do not depend
# on the contents of any module.
go list -deps cmd
stdout '^fmt$'
stdout '^cmd/go$'

go list $GOROOT/src/fmt
stdout '^fmt$'


# 'go list -m' with an explicit version should resolve that version.
go list -m example.com/version@latest
stdout 'example.com/version v1.1.0'

# 'go list -m -versions' should succeed even without an explicit version.
go list -m -versions example.com/version
stdout 'v1.0.0\s+v1.0.1\s+v1.1.0'

# 'go list -m <mods> all' does not include the dependencies of <mods> in the computation of 'all'.
go list -m example.com/printversion@v1.0.0 all
stdout 'example.com/printversion v1.0.0'
stderr 'warning: pattern "all" matched no module dependencies'
! stdout 'example.com/version'


# 'go clean' should skip the current directory if it isn't in a module.
go clean -n
! stdout .
! stderr .

# 'go mod graph' should not display anything, since there are no active modules.
go mod graph
! stdout .
! stderr .

# 'go mod why' should report that nothing is a dependency.
go mod why -m example.com/version
stdout 'does not need'


# 'go mod edit', 'go mod tidy', and 'go mod fmt' should fail:
# there is no go.mod file to edit.
! go mod tidy
stderr 'cannot find main module'
! go mod edit -fmt
stderr 'cannot find main module'
! go mod edit -require example.com/version@v1.0.0
stderr 'cannot find main module'


# 'go mod download' should download exactly the requested module without dependencies.
rm -r $GOPATH/pkg/mod/cache/download/example.com
go mod download example.com/printversion@v1.0.0
exists $GOPATH/pkg/mod/cache/download/example.com/printversion/@v/v1.0.0.zip
! exists $GOPATH/pkg/mod/cache/download/example.com/version/@v/v1.0.0.zip

# 'go mod vendor' should fail: it starts by clearing the existing vendor
# directory, and we don't know where that is.
! go mod vendor
stderr 'cannot find main module'

# 'go mod verify' should succeed: we have no modules to verify.
go mod verify
stdout 'all modules verified'
! stderr .


# 'go get' without arguments implicitly operates on the main module, and thus
# should fail.
! go get
stderr 'cannot find main module'
! go get -u
stderr 'cannot find main module'
! go get -u ./foo
stderr 'cannot find main module'

# 'go get -u all' upgrades the transitive import graph of the main module,
# which is empty.
go get -u all
! stdout .
stderr 'warning: "all" matched no packages'

# 'go get -m' should check the proposed module graph for consistency,
# even though it will not be saved anywhere.
! go get -m example.com/printversion@v1.0.0 example.com/version@none
stderr 'inconsistent versions'

# 'go get -d' should download and extract the source code needed to build the requested version.
rm -r $GOPATH/pkg/mod/example.com
go get -d example.com/printversion@v1.0.0
exists $GOPATH/pkg/mod/example.com/printversion@v1.0.0
exists $GOPATH/pkg/mod/example.com/version@v1.0.0


# 'go build' without arguments implicitly operates on the current directory, and should fail.
cd foo
! go build
stderr 'cannot find main module'
cd ..

# 'go build' of a non-module directory should fail too.
! go build ./foo
stderr 'cannot find main module'

# However, 'go build' should succeed for standard-library packages.
go build -n fmt


# TODO(golang.org/issue/28992): 'go doc' should document the latest version.
# For now it does not.
! go doc example.com/version
stderr 'no such package'

# 'go install' with a version should fail due to syntax.
! go install example.com/printversion@v1.0.0
stderr 'can only use path@version syntax with'


# The remainder of the test checks dependencies by linking and running binaries.
[short] stop

# 'go get' of a binary without a go.mod should install the requested version,
# resolving outside dependencies to the latest available versions.
go get example.com/printversion@v0.1.0
exec ../bin/printversion
stdout 'path is example.com/printversion'
stdout 'main is example.com/printversion v0.1.0'
stdout 'using example.com/version v1.1.0'

# 'go get' of a versioned binary should build and install the latest version
# using its minimal module requirements, ignoring replacements and exclusions.
go get example.com/printversion
exec ../bin/printversion
stdout 'path is example.com/printversion'
stdout 'main is example.com/printversion v1.0.0'
stdout 'using example.com/version v1.0.0'

# 'go get -u=patch' should patch dependencies before installing,
# again ignoring replacements and exclusions.
go get -u=patch example.com/printversion@v1.0.0
exec ../bin/printversion
stdout 'path is example.com/printversion'
stdout 'main is example.com/printversion v1.0.0'
stdout 'using example.com/version v1.0.1'

# 'go install' without a version should install the latest version
# using its minimal module requirements.
go install example.com/printversion
exec ../bin/printversion
stdout 'path is example.com/printversion'
stdout 'main is example.com/printversion v1.0.0'
stdout 'using example.com/version v1.0.0'

# 'go run' should use 'main' as the effective module and import path.
go run ./foo/foo.go
stdout 'path is \.$'
stdout 'main is main \(devel\)'
stdout 'using example.com/version v1.1.0'


-- README.txt --
There is no go.mod file in the working directory.

-- foo/foo.go --
package main

import (
	"fmt"
	"os"
	"runtime/debug"

	_ "example.com/version"
)

func main() {
	info, ok := debug.ReadBuildInfo()
	if !ok {
		panic("missing build info")
	}
	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
	for _, m := range info.Deps {
		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)
	}
}