refactor: remove tablewriter dependency (#1351)

* Rewrite Friendly.table method to replace tablewriter with fmt.Fprintf

* Refactor Stylish formatter to use custom table rendering instead of tablewriter

* Refactor Friendly and Stylish formatters to utilize a new custom table rendering function

* Remove unused dependencies from go.mod and go.sum

* Refactor table formatting by replacing formatTable with a new table function in friendly.go

* Utilize text/tabwriter in fromatting a table

* Refactor table function to use bytes.Buffer for improved performance

formatter/friendly.go

@@ -7,10 +7,10 @@ import (
 	"io"
 	"slices"
 	"strings"
+	"text/tabwriter"
 
 	"github.com/fatih/color"
 	"github.com/mgechev/revive/lint"
-	"github.com/olekukonko/tablewriter"
 )
 
 func getErrorEmoji() string {
@@ -64,12 +64,12 @@ func (f *Friendly) printFriendlyFailure(sb *strings.Builder, failure lint.Failur
 	sb.WriteString("\n\n")
 }
 
-func (f *Friendly) printHeaderRow(sb *strings.Builder, failure lint.Failure, severity lint.Severity) {
+func (*Friendly) printHeaderRow(sb *strings.Builder, failure lint.Failure, severity lint.Severity) {
 	emoji := getWarningEmoji()
 	if severity == lint.SeverityError {
 		emoji = getErrorEmoji()
 	}
-	sb.WriteString(f.table([][]string{{emoji, ruleDescriptionURL(failure.RuleName), color.GreenString(failure.Failure)}}))
+	sb.WriteString(table([][]string{{emoji, ruleDescriptionURL(failure.RuleName), color.GreenString(failure.Failure)}}))
 }
 
 func (*Friendly) printFilePosition(sb *strings.Builder, failure lint.Failure) {
@@ -109,7 +109,7 @@ func (*Friendly) printSummary(w io.Writer, errors, warnings int) {
 	}
 }
 
-func (f *Friendly) printStatistics(w io.Writer, header string, stats map[string]int) {
+func (*Friendly) printStatistics(w io.Writer, header string, stats map[string]int) {
 	if len(stats) == 0 {
 		return
 	}
@@ -125,17 +125,19 @@ func (f *Friendly) printStatistics(w io.Writer, header string, stats map[string]
 		formatted = append(formatted, []string{color.GreenString(fmt.Sprintf("%d", entry.failures)), entry.name})
 	}
 	fmt.Fprintln(w, header)
-	fmt.Fprintln(w, f.table(formatted))
+	fmt.Fprintln(w, table(formatted))
 }
 
-func (*Friendly) table(rows [][]string) string {
-	buf := new(bytes.Buffer)
-	table := tablewriter.NewWriter(buf)
-	table.SetBorder(false)
-	table.SetColumnSeparator("")
-	table.SetRowSeparator("")
-	table.SetAutoWrapText(false)
-	table.AppendBulk(rows)
-	table.Render()
+func table(rows [][]string) string {
+	var buf bytes.Buffer
+	tw := tabwriter.NewWriter(&buf, 0, 0, 2, ' ', 0)
+	for _, row := range rows {
+		tw.Write([]byte{'\t'})
+		for _, col := range row {
+			tw.Write(append([]byte(col), '\t'))
+		}
+		tw.Write([]byte{'\n'})
+	}
+	tw.Flush()
 	return buf.String()
 }

formatter/friendly_test.go

@@ -31,6 +31,11 @@ func TestFriendly_printStatistics(t *testing.T) {
 			stats:    map[string]int{"rule2": 2, "rule1": 1, "rule3": 3},
 			expected: "Warnings:\n  3  rule3  \n  2  rule2  \n  1  rule1  \n\n",
 		},
+		{
+			name:     "multiple stats with different length sorted by failures desc",
+			stats:    map[string]int{"rule2": 2, "rule1": 1, "rule3": 3, "rule100": 40},
+			expected: "Warnings:\n  40  rule100  \n  3   rule3    \n  2   rule2    \n  1   rule1    \n\n",
+		},
 	}
 
 	for _, tt := range tests {
@@ -44,3 +49,41 @@ func TestFriendly_printStatistics(t *testing.T) {
 		})
 	}
 }
+
+func TestFriendly_table(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    [][]string
+		expected string
+	}{
+		{
+			name:     "empty input",
+			input:    [][]string{},
+			expected: "",
+		},
+		{
+			name:     "single row",
+			input:    [][]string{{"1", "2", "3"}},
+			expected: "  1  2  3  \n",
+		},
+		{
+			name:     "multiple rows",
+			input:    [][]string{{"1", "2", "3"}, {"4", "5", "6"}},
+			expected: "  1  2  3  \n  4  5  6  \n",
+		},
+		{
+			name:     "multiple rows with different column lengths",
+			input:    [][]string{{"1", "22", "3"}, {"4", "5", "6"}},
+			expected: "  1  22  3  \n  4  5   6  \n",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := table(tt.input)
+			if got != tt.expected {
+				t.Errorf("got %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}

formatter/stylish.go

@@ -1,12 +1,10 @@
 package formatter
 
 import (
-	"bytes"
 	"fmt"
 
 	"github.com/fatih/color"
 	"github.com/mgechev/revive/lint"
-	"github.com/olekukonko/tablewriter"
 )
 
 // Stylish is an implementation of the Formatter interface
@@ -63,17 +61,9 @@ func (*Stylish) Format(failures <-chan lint.Failure, config lint.Config) (string
 
 	output := ""
 	for filename, val := range fileReport {
-		buf := new(bytes.Buffer)
-		table := tablewriter.NewWriter(buf)
-		table.SetBorder(false)
-		table.SetColumnSeparator("")
-		table.SetRowSeparator("")
-		table.SetAutoWrapText(false)
-		table.AppendBulk(val)
-		table.Render()
 		c := color.New(color.Underline)
 		output += c.SprintfFunc()(filename + "\n")
-		output += buf.String() + "\n"
+		output += table(val) + "\n"
 	}
 
 	suffix := fmt.Sprintf(" %d %s (%d errors) (%d warnings)", total, ps, totalErrors, total-totalErrors)