feat: add sort-order option

Author: ldez

Diff for: .golangci.reference.yml

@@ -109,14 +109,34 @@ output:
   # Default: ""
   path-prefix: ""
 
-  # Sort results by: filepath, line and column.
+  # Sort results.
+  # See also `sort-order`.
   # Default: false
   sort-results: true
 
+  # Order to use when sorting results.
+  # Require `sort-results` to `true`.
+  # Possible values: `file`, `linter`, and `severity`.
+  #
+  # If the severity values are inside the following list, they are ordered in this order:
+  #   1. error
+  #   2. warning
+  #   3. high
+  #   4. medium
+  #   5. low
+  # Either they are sorted alphabetically.
+  #
+  # Default: ["file"]
+  sort-order:
+    - linter
+    - severity
+    - file # filepath, line, and column.
+
   # Show statistics per linter.
   # Default: false
   show-stats: true
 
+
 # All available settings of specific linters.
 linters-settings:
   asasalint:

Diff for: pkg/commands/flagsets.go

@@ -71,6 +71,8 @@ func setupOutputFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 		color.GreenString("Make issues output unique by line"))
 	internal.AddFlagAndBind(v, fs, fs.Bool, "sort-results", "output.sort-results", false,
 		color.GreenString("Sort linter results"))
+	internal.AddFlagAndBind(v, fs, fs.StringSlice, "sort-order", "output.sort-order", nil,
+		color.GreenString("Sort order of linter results"))
 	internal.AddFlagAndBind(v, fs, fs.String, "path-prefix", "output.path-prefix", "",
 		color.GreenString("Path prefix to add to output"))
 	internal.AddFlagAndBind(v, fs, fs.Bool, "show-stats", "output.show-stats", false, color.GreenString("Show statistics per linter"))

Diff for: pkg/config/output.go

@@ -1,5 +1,11 @@
 package config
 
+import (
+	"errors"
+	"fmt"
+	"slices"
+)
+
 const (
 	OutFormatJSON              = "json"
 	OutFormatLineNumber        = "line-number"
@@ -28,11 +34,26 @@ var OutFormats = []string{
 }
 
 type Output struct {
-	Format          string `mapstructure:"format"`
-	PrintIssuedLine bool   `mapstructure:"print-issued-lines"`
-	PrintLinterName bool   `mapstructure:"print-linter-name"`
-	UniqByLine      bool   `mapstructure:"uniq-by-line"`
-	SortResults     bool   `mapstructure:"sort-results"`
-	PathPrefix      string `mapstructure:"path-prefix"`
-	ShowStats       bool   `mapstructure:"show-stats"`
+	Format          string   `mapstructure:"format"`
+	PrintIssuedLine bool     `mapstructure:"print-issued-lines"`
+	PrintLinterName bool     `mapstructure:"print-linter-name"`
+	UniqByLine      bool     `mapstructure:"uniq-by-line"`
+	SortResults     bool     `mapstructure:"sort-results"`
+	SortOrder       []string `mapstructure:"sort-order"`
+	PathPrefix      string   `mapstructure:"path-prefix"`
+	ShowStats       bool     `mapstructure:"show-stats"`
+}
+
+func (o *Output) Validate() error {
+	if !o.SortResults && len(o.SortOrder) > 0 {
+		return errors.New("sort-results should be 'true' to use sort-order")
+	}
+
+	for _, s := range o.SortOrder {
+		if !slices.Contains([]string{"linter", "file", "severity"}, s) {
+			return fmt.Errorf("unsupported sort-order name %q", s)
+		}
+	}
+
+	return nil
 }

Diff for: pkg/config/output_test.go

@@ -0,0 +1,80 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOutput_Validate(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		settings *Output
+	}{
+		{
+			desc: "file",
+			settings: &Output{
+				SortResults: true,
+				SortOrder:   []string{"file"},
+			},
+		},
+		{
+			desc: "linter",
+			settings: &Output{
+				SortResults: true,
+				SortOrder:   []string{"linter"},
+			},
+		},
+		{
+			desc: "severity",
+			settings: &Output{
+				SortResults: true,
+				SortOrder:   []string{"severity"},
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			err := test.settings.Validate()
+			require.NoError(t, err)
+		})
+	}
+}
+
+func TestOutput_Validate_error(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		settings *Output
+		expected string
+	}{
+		{
+			desc: "sort-results false and sort-order",
+			settings: &Output{
+				SortOrder: []string{"file"},
+			},
+			expected: "sort-results should be 'true' to use sort-order",
+		},
+		{
+			desc: "invalid sort-order",
+			settings: &Output{
+				SortResults: true,
+				SortOrder:   []string{"a"},
+			},
+			expected: `unsupported sort-order name "a"`,
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			err := test.settings.Validate()
+			require.EqualError(t, err, test.expected)
+		})
+	}
+}