Fix lint errs (#59)

vendor/honnef.co/go/tools/lint/lintutil/format/format.go

@@ -0,0 +1,128 @@
+// Package format provides formatters for linter problems.
+package format
+
+import (
+	"encoding/json"
+	"fmt"
+	"go/token"
+	"io"
+	"os"
+	"path/filepath"
+	"text/tabwriter"
+
+	"honnef.co/go/tools/lint"
+)
+
+func shortPath(path string) string {
+	cwd, err := os.Getwd()
+	if err != nil {
+		return path
+	}
+	if rel, err := filepath.Rel(cwd, path); err == nil && len(rel) < len(path) {
+		return rel
+	}
+	return path
+}
+
+func relativePositionString(pos token.Position) string {
+	s := shortPath(pos.Filename)
+	if pos.IsValid() {
+		if s != "" {
+			s += ":"
+		}
+		s += fmt.Sprintf("%d:%d", pos.Line, pos.Column)
+	}
+	if s == "" {
+		s = "-"
+	}
+	return s
+}
+
+type Statter interface {
+	Stats(total, errors, warnings int)
+}
+
+type Formatter interface {
+	Format(p lint.Problem)
+}
+
+type Text struct {
+	W io.Writer
+}
+
+func (o Text) Format(p lint.Problem) {
+	fmt.Fprintf(o.W, "%v: %s\n", relativePositionString(p.Position), p.String())
+}
+
+type JSON struct {
+	W io.Writer
+}
+
+func severity(s lint.Severity) string {
+	switch s {
+	case lint.Error:
+		return "error"
+	case lint.Warning:
+		return "warning"
+	case lint.Ignored:
+		return "ignored"
+	}
+	return ""
+}
+
+func (o JSON) Format(p lint.Problem) {
+	type location struct {
+		File   string `json:"file"`
+		Line   int    `json:"line"`
+		Column int    `json:"column"`
+	}
+	jp := struct {
+		Code     string   `json:"code"`
+		Severity string   `json:"severity,omitempty"`
+		Location location `json:"location"`
+		Message  string   `json:"message"`
+	}{
+		Code:     p.Check,
+		Severity: severity(p.Severity),
+		Location: location{
+			File:   p.Position.Filename,
+			Line:   p.Position.Line,
+			Column: p.Position.Column,
+		},
+		Message: p.Text,
+	}
+	_ = json.NewEncoder(o.W).Encode(jp)
+}
+
+type Stylish struct {
+	W io.Writer
+
+	prevFile string
+	tw       *tabwriter.Writer
+}
+
+func (o *Stylish) Format(p lint.Problem) {
+	if p.Position.Filename == "" {
+		p.Position.Filename = "-"
+	}
+
+	if p.Position.Filename != o.prevFile {
+		if o.prevFile != "" {
+			o.tw.Flush()
+			fmt.Fprintln(o.W)
+		}
+		fmt.Fprintln(o.W, p.Position.Filename)
+		o.prevFile = p.Position.Filename
+		o.tw = tabwriter.NewWriter(o.W, 0, 4, 2, ' ', 0)
+	}
+	fmt.Fprintf(o.tw, "  (%d, %d)\t%s\t%s\n", p.Position.Line, p.Position.Column, p.Check, p.Text)
+}
+
+func (o *Stylish) Stats(total, errors, warnings int) {
+	if o.tw != nil {
+		o.tw.Flush()
+		fmt.Fprintln(o.W)
+	}
+	fmt.Fprintf(o.W, " ✖ %d problems (%d errors, %d warnings)\n",
+		total, errors, warnings)
+}