fix #513: don't add gofmt "with -s" if not needed

Output
  File is not `gofmt`-ed
insted of
  File is not `gofmt`-ed  with `-s`
when gofmt.simplify == false

.travis.yml

@@ -4,6 +4,9 @@ go:
   - 1.11.x
   - 1.12.x
 
+before_script:
+  - go get github.com/valyala/quicktemplate
+
 script: make check_generated test
 
 after_success:

Makefile

@@ -1,6 +1,5 @@
 .DEFAULT_GOAL = test
 .PHONY: FORCE
-export GO111MODULE = on
 
 # Build
 
@@ -18,8 +17,6 @@ test: build
 	GL_TEST_RUN=1 ./golangci-lint run --no-config -v --skip-dirs 'test/testdata_etc,pkg/golinters/goanalysis/(checker|passes)'
 	GL_TEST_RUN=1 go test -v ./...
 
-build:
-	go build -o golangci-lint ./cmd/golangci-lint
 .PHONY: test
 
 test_race:
@@ -55,18 +52,18 @@ golangci-lint: FORCE pkg/logutils/log_mock.go
 	go build -o $@ ./cmd/golangci-lint
 
 tools/mockgen: go.mod go.sum
-	GOBIN=$(CURDIR)/tools go install github.com/golang/mock/mockgen
+	GOBIN=$(CURDIR)/tools GO111MODULE=on go install github.com/golang/mock/mockgen
 
 tools/goimports: go.mod go.sum
-	GOBIN=$(CURDIR)/tools go install golang.org/x/tools/cmd/goimports
+	GOBIN=$(CURDIR)/tools GO111MODULE=on go install golang.org/x/tools/cmd/goimports
 
 tools/go.mod:
 	@mkdir -p tools
 	@rm -f $@
-	cd tools && go mod init local-tools
+	cd tools && GO111MODULE=on go mod init local-tools
 
 tools/godownloader: Makefile tools/go.mod
-	cd tools && GOBIN=$(CURDIR)/tools go get github.com/goreleaser/godownloader@3b90d248ba30307915288f08ab3f2fc2d9f6710c
+	cd tools && GOBIN=$(CURDIR)/tools GO111MODULE=on go get github.com/goreleaser/godownloader@3b90d248ba30307915288f08ab3f2fc2d9f6710c
 
 tools/svg-term:
 	@mkdir -p tools
@@ -81,7 +78,8 @@ docs/demo.svg: tools/svg-term tools/Dracula.itermcolors
 	PATH=$(CURDIR)/tools:$${PATH} svg-term --cast=183662 --out docs/demo.svg --window --width 110 --height 30 --from 2000 --to 20000 --profile ./tools/Dracula.itermcolors --term iterm2
 
 install.sh: tools/godownloader .goreleaser.yml
-	PATH=$(CURDIR)/tools:$${PATH} tools/godownloader .goreleaser.yml | sed '/DO NOT EDIT/s/ on [0-9TZ:-]*//' > $@
+	# TODO: use when Windows installation will be fixed in the upstream
+	#PATH=$(CURDIR)/tools:$${PATH} tools/godownloader .goreleaser.yml | sed '/DO NOT EDIT/s/ on [0-9TZ:-]*//' > $@
 
 README.md: FORCE golangci-lint
 	go run ./scripts/gen_readme/main.go
@@ -91,10 +89,11 @@ pkg/logutils/log_mock.go: tools/mockgen tools/goimports pkg/logutils/log.go
 	PATH=$(CURDIR)/tools:$${PATH} go generate ./...
 
 go.mod: FORCE
-	go mod verify
+	GO111MODULE=on go mod verify
-	go mod tidy
+	GO111MODULE=on go mod tidy
 go.sum: go.mod
 
+.PHONY: vendor
 vendor: go.mod go.sum
 	rm -rf vendor
-	go mod vendor
+	GO111MODULE=on go mod vendor

pkg/golinters/gofmt.go

@@ -233,7 +233,7 @@ func (p *hunkChangesParser) parse(h *diffpkg.Hunk) []Change {
 	return p.ret
 }
 
-func (g Gofmt) extractIssuesFromPatch(patch string, log logutils.Log) ([]result.Issue, error) {
+func (g Gofmt) extractIssuesFromPatch(patch string, log logutils.Log, lintCtx *linter.Context) ([]result.Issue, error) {
 	diffs, err := diffpkg.ParseMultiFileDiff([]byte(patch))
 	if err != nil {
 		return nil, errors.Wrap(err, "can't parse patch")
@@ -251,9 +251,14 @@ func (g Gofmt) extractIssuesFromPatch(patch string, log logutils.Log) ([]result.
 		}
 
 		for _, hunk := range d.Hunks {
-			text := "File is not `gofmt`-ed with `-s`"
+			var text string
 			if g.UseGoimports {
 				text = "File is not `goimports`-ed"
+			} else {
+				text = "File is not `gofmt`-ed"
+				if lintCtx.Settings().Gofmt.Simplify {
+					text += " with `-s`"
+				}
 			}
 			p := hunkChangesParser{
 				log: log,
@@ -301,7 +306,7 @@ func (g Gofmt) Run(ctx context.Context, lintCtx *linter.Context) ([]result.Issue
 			continue
 		}
 
-		is, err := g.extractIssuesFromPatch(string(diff), lintCtx.Log)
+		is, err := g.extractIssuesFromPatch(string(diff), lintCtx.Log, lintCtx)
 		if err != nil {
 			return nil, fmt.Errorf("can't extract issues from gofmt diff output %q: %s", string(diff), err)
 		}

test/errchk.go

@@ -52,6 +52,7 @@ func errorCheck(outStr string, wantAuto bool, fullshort ...string) (err error) {
 		}
 		matched := false
 		n := len(out)
+		var textsToMatch []string
 		for _, errmsg := range errmsgs {
 			// Assume errmsg says "file:line: foo".
 			// Cut leading "file:line: " to avoid accidental matching of file name instead of message.
@@ -63,10 +64,13 @@ func errorCheck(outStr string, wantAuto bool, fullshort ...string) (err error) {
 				matched = true
 			} else {
 				out = append(out, errmsg)
+				textsToMatch = append(textsToMatch, text)
 			}
 		}
 		if !matched {
-			errs = append(errs, fmt.Errorf("%s:%d: no match for %#q in:\n\t%s", we.file, we.lineNum, we.reStr, strings.Join(out[n:], "\n\t")))
+			err := fmt.Errorf("%s:%d: no match for %#q vs %q in:\n\t%s",
+				we.file, we.lineNum, we.reStr, textsToMatch, strings.Join(out[n:], "\n\t"))
+			errs = append(errs, err)
 			continue
 		}
 	}

test/testdata/gofmt_no_simplify.go

@@ -0,0 +1,13 @@
+//args: -Egofmt
+//config: linters-settings.gofmt.simplify=false
+package testdata
+
+import "fmt"
+
+func GofmtNotSimplifiedOk() {
+	var x []string
+	fmt.Print(x[1:len(x)])
+}
+
+func GofmtBadFormat(){  // ERROR "^File is not `gofmt`-ed$"
+}

test/testshared/testshared.go

@@ -17,6 +17,7 @@ type LintRunner struct {
 	t         assert.TestingT
 	log       logutils.Log
 	env       []string
+	installed bool
 }
 
 func NewLintRunner(t assert.TestingT, environ ...string) *LintRunner {
@@ -30,12 +31,13 @@ func NewLintRunner(t assert.TestingT, environ ...string) *LintRunner {
 }
 
 func (r *LintRunner) Install() {
-	if _, err := os.Stat("../golangci-lint"); err == nil {
+	if r.installed {
 		return
 	}
 
 	cmd := exec.Command("make", "-C", "..", "build")
 	assert.NoError(r.t, cmd.Run(), "Can't go install golangci-lint")
+	r.installed = true
 }
 
 type RunResult struct {
@@ -79,7 +81,7 @@ func (r *LintRunner) Run(args ...string) *RunResult {
 	r.Install()
 
 	runArgs := append([]string{"run"}, args...)
-	r.log.Infof("golangci-lint %s", strings.Join(runArgs, " "))
+	r.log.Infof("../golangci-lint %s", strings.Join(runArgs, " "))
 	cmd := exec.Command("../golangci-lint", runArgs...)
 	cmd.Env = append(os.Environ(), r.env...)
 	out, err := cmd.CombinedOutput()

vendor/modules.txt

@@ -181,12 +181,12 @@ github.com/spf13/viper
 # github.com/stretchr/testify v1.2.2
 github.com/stretchr/testify/assert
 github.com/stretchr/testify/require
+# github.com/timakin/bodyclose v0.0.0-20190407043127-4a873e97b2bb
+github.com/timakin/bodyclose/passes/bodyclose
 # github.com/valyala/bytebufferpool v1.0.0
 github.com/valyala/bytebufferpool
 # github.com/valyala/quicktemplate v1.1.1
 github.com/valyala/quicktemplate
-# github.com/timakin/bodyclose v0.0.0-20190407043127-4a873e97b2bb
-github.com/timakin/bodyclose/passes/bodyclose
 # golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a
 golang.org/x/crypto/ssh/terminal
 # golang.org/x/sys v0.0.0-20190312061237-fead79001313