src/cmd/go/testdata/script/vet_basic.txt

# Test basic features of "go vet"/"go fix" CLI.
#
# The example relies on two analyzers:
# - hostport (which is included in both the fix and vet suites), and
# - printf (which is only in the vet suite).
# Each reports one diagnostic with a fix.

# vet default flags print diagnostics to stderr. Diagnostic => nonzero exit.
! go vet example.com/x
stderr 'does not work with IPv6'
stderr 'non-constant format string in call to fmt.Sprintf'

# -hostport runs only one analyzer. Diagnostic => failure.
! go vet -hostport example.com/x
stderr 'does not work with IPv6'
! stderr 'non-constant format string'

# -timeformat runs only one analyzer. No diagnostics => success.
go vet -timeformat example.com/x
! stderr .

# JSON output includes diagnostics and fixes. Always success.
go vet -json example.com/x
! stderr .
stdout '"example.com/x": {'
stdout '"hostport":'
stdout '"message": "address format .* does not work with IPv6",'
stdout '"suggested_fixes":'
stdout '"message": "Replace fmt.Sprintf with net.JoinHostPort",'

# vet -fix -diff displays a diff.
go vet -fix -diff example.com/x
stdout '\-var _ = fmt.Sprintf\(s\)'
stdout '\+var _ = fmt.Sprintf\("%s", s\)'
stdout '\-var _, _ = net.Dial\("tcp", fmt.Sprintf\("%s:%d", s, 80\)\)'
stdout '\+var _, _ = net.Dial\("tcp", net.JoinHostPort\(s, "80"\)\)'

# vet -fix quietly applies the vet suite fixes.
cp x.go x.go.bak
go vet -fix example.com/x
grep 'fmt.Sprintf\("%s", s\)' x.go
grep 'net.JoinHostPort' x.go
! stderr .
cp x.go.bak x.go

! go vet -diff example.com/x
stderr 'go vet -diff flag requires -fix'

# go fix applies the fix suite fixes.
go fix example.com/x
grep 'net.JoinHostPort' x.go
! grep 'fmt.Sprintf\("%s", s\)' x.go
! stderr .
cp x.go.bak x.go

# Show diff of fixes from the fix suite.
go fix -diff example.com/x
! stdout '\-var _ = fmt.Sprintf\(s\)'
stdout '\-var _, _ = net.Dial\("tcp", fmt.Sprintf\("%s:%d", s, 80\)\)'
stdout '\+var _, _ = net.Dial\("tcp", net.JoinHostPort\(s, "80"\)\)'

# Show fix-suite fixes in JSON form.
go fix -json example.com/x
! stderr .
stdout '"example.com/x": {'
stdout '"hostport":'
stdout '"message": "address format .* does not work with IPv6",'
stdout '"suggested_fixes":'
stdout '"message": "Replace fmt.Sprintf with net.JoinHostPort",'
! stdout '"printf":'
! stdout '"message": "non-constant format string.*",'
! stdout '"message": "Insert.*%s.*format.string",'

# Show vet-suite fixes in JSON form.
go vet -fix -json example.com/x
! stderr .
stdout '"example.com/x": {'
stdout '"hostport":'
stdout '"message": "address format .* does not work with IPv6",'
stdout '"suggested_fixes":'
stdout '"message": "Replace fmt.Sprintf with net.JoinHostPort",'
stdout '"printf":'
stdout '"message": "non-constant format string.*",'
stdout '"suggested_fixes":'
stdout '"message": "Insert.*%s.*format.string",'

# Reject -diff + -json.
! go fix -diff -json example.com/x
stderr '-json and -diff cannot be used together'

# Legacy way of selecting fixers is a no-op.
go fix -fix=old1,old2 example.com/x
stderr 'go fix: the -fix=old1,old2 flag is obsolete and has no effect'
cp x.go.bak x.go

# -c=n flag shows n lines of context.
! go vet -c=2 -printf example.com/x
stderr 'x.go:12:21: non-constant format string in call to fmt.Sprintf'
! stderr '9	'
stderr '10	'
stderr '11	// This call...'
stderr '12	var _ = fmt.Sprintf\(s\)'
stderr '13	'
stderr '14	'
! stderr '15	'

-- go.mod --
module example.com/x
go 1.25

-- x.go --
package x


import (
	"fmt"
	"net"
)

var s string

// This call yields a "non-constant format string" diagnostic, with a fix (go vet only).
var _ = fmt.Sprintf(s)

// This call yields a hostport diagnostic, with a fix (go vet and go fix).
var _, _ = net.Dial("tcp", fmt.Sprintf("%s:%d", s, 80))