//
// Lookup should only be used with non-factored verbs
// such as "go" and "toolchain", usually to find versions
// or version-like strings.
func GoModLookup(gomod []byte, key string) string {
	for len(gomod) > 0 {
		var line []byte
		line, gomod, _ = bytes.Cut(gomod, nl)
		line = bytes.TrimSpace(line)
		if v, ok := parseKey(line, key); ok {
			return v
		}
	}
	return ""
}

go env GOMOD
stdout z[/\\]go.mod

cd $GOPATH/src/x/y
go env GOMOD
stdout 'NUL|/dev/null'
go list -m
stdout '^command-line-arguments$'

cd $GOPATH/foo
go env GOMOD
stdout foo[/\\]go.mod

cd $GOPATH/foo/bar/baz
go env GOMOD
stdout foo[/\\]go.mod

# GO111MODULE=off should trigger nowhere
env GO111MODULE=off

cd $GOPATH/src/x/y/z
go env GOMOD
! stdout .+

cd $GOPATH/foo
go env GOMOD

stdout '"TagSum": "t1:47DEQpj8HBSa[+]/TImW[+]5JCeuQeRkm5NMpJWZG3hSuFU="'
stdout '"Ref": "HEAD"'
stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
! stdout '"Dir"'
! stdout '"Info"'
! stdout '"GoMod"'
! stdout '"Zip"'

# reuse go mod download vcstest/hello pseudoversion result
go mod download -reuse=hellopseudo.json -x -json vcs-test.golang.org/git/hello.git@v0.0.0-20170922010558-fc3a09f3dc5c

---
version: 2
updates:
  - package-ecosystem: gomod
    directory: /
    schedule:
      interval: weekly
  - package-ecosystem: github-actions
    directory: /
    schedule:
      interval: weekly
  - package-ecosystem: gomod
    directory: /tests
    schedule:

env TESTGO_VERSION=go1.500
env TESTGO_VERSION_SWITCH=mismatch

# go env GOMOD should not trigger a toolchain download
cd $GOPATH/mod
go env GOMOD
stdout mod[/\\]go.mod
! stderr 'go: toolchain go1.500 invoked to provide go1.700'

# go env GOWORK should not trigger a toolchain download
cd $GOPATH/work
go env GOWORK
stdout work[/\\]go.work
! stderr 'go: toolchain go1.500 invoked to provide go1.700'

-- $GOPATH/mod/go.mod --

-- go.mod --
module quoter

require rsc.io/quote/v3 v3.0.0

-- main.go --
package main

import (
	"fmt"

go mod init example.com/m
grep example.com/m go.alt.mod

# 'go env GOMOD' should print the path to the real file.
# 'go env' does not recognize the '-modfile' flag.
go env GOMOD
stdout '^'$WORK${/}gopath${/}src${/}'go\.mod$'

# 'go list -m' should print the effective go.mod file as GoMod though.
go list -m -f '{{.GoMod}}'
stdout '^go.alt.mod$'

# go mod edit should operate on the alternate file

				}

				if tt.gomod != "" || tt.gomodErr != "" {
					data, err := repo.GoMod(ctx, tt.version)
					if err != nil && tt.gomodErr == "" {
						t.Errorf("repo.GoMod(%q): %v", tt.version, err)
					} else if err != nil && tt.gomodErr != "" {
						if err.Error() != tt.gomodErr {
							t.Errorf("repo.GoMod(%q): %v, want %q", tt.version, err, tt.gomodErr)
						}

# list {{.Dir}} shows replaced directories
cp go.mod2 go.mod
go list -mod=mod -f {{.Dir}} rsc.io/quote
go list -m -f '{{.Path}} {{.Version}} {{.Dir}}{{with .Replace}} {{.GoMod}} => {{.Version}} {{.Dir}} {{.GoMod}}{{end}}' all
stdout 'mod[\\/]rsc.io[\\/]quote@v1.5.1'
stdout 'v1.3.0.*mod[\\/]rsc.io[\\/]sampler@v1.3.1 .*[\\/]v1.3.1.mod => v1.3.1.*sampler@v1.3.1 .*[\\/]v1.3.1.mod'

# list std should work
go list std

cd ../4-to-1
go list -m gopkg.in/src-d/go-git.v4

cd ../4-to-incompatible
go list -m gopkg.in/src-d/go-git.v4

# A mismatched gopkg.in path should not be able to replace a different major version.
cd ../3-to-gomod-4
! go list -m gopkg.in/src-d/go-git.v3