feat(format): add --format-always flag

README.md

@@ -17,7 +17,7 @@ The isolated comment blocks like below:
 
 ```
 import (
-  "fmt" 
+  "fmt"
   // this line is isolated comment
 
   // those lines belong to one
@@ -67,10 +67,10 @@ Now GCI provides two command line methods, mainly for backward compatibility.
 GCI supports three modes of operation
 
 > **Note**
-> 
-> Since v0.10.0, the `-s` and `--section` flag can only be used multiple times to specify multiple sections.  
-> For example, you could use `-s standard,default` before, but now you must use `-s standard -s default`.  
-> This breaking change makes it possible for the project to support specifying multiple custom prefixes. (Please see below.)  
+>
+> Since v0.10.0, the `-s` and `--section` flag can only be used multiple times to specify multiple sections.
+> For example, you could use `-s standard,default` before, but now you must use `-s standard -s default`.
+> This breaking change makes it possible for the project to support specifying multiple custom prefixes. (Please see below.)
 
 
 ```shell
@@ -93,6 +93,7 @@ Flags:
                           blank - blank section, contains all blank imports.
       --skip-generated    Skip generated files
       --custom-order      Enable custom order of sections. If specified, make the section order the same as your configuration order. The default order is standard > default > custom > blank > dot.
+      --format-always     Format the file even if no imports blocks are defined. The default value is false.
 ```
 
 ```shell
@@ -157,6 +158,7 @@ Flags:
                           dot - dot section, contains all dot imports.
       --skip-generated    Skip generated files
       --custom-order      Enable custom order of sections. If specified, make the section order the same as your configuration order. The default order is standard > default > custom > blank > dot.
+      --format-always     Format the file even if no imports blocks are defined. The default value is false.
 ```
 
 ### Old style
@@ -188,9 +190,9 @@ Run `gci write -s standard -s default -s "prefix(github.com/daixiang0/gci)" main
 package main
 import (
   "golang.org/x/tools"
-  
+
   "fmt"
-  
+
   "github.com/daixiang0/gci"
 )
 ```

cmd/gci/gcicommand.go

@@ -12,7 +12,7 @@ import (
 type processingFunc = func(args []string, gciCfg config.Config) error
 
 func (e *Executor) newGciCommand(use, short, long string, aliases []string, stdInSupport bool, processingFunc processingFunc) *cobra.Command {
-	var noInlineComments, noPrefixComments, skipGenerated, customOrder, debug *bool
+	var noInlineComments, noPrefixComments, skipGenerated, customOrder, debug, formatAlways *bool
 	var sectionStrings, sectionSeparatorStrings *[]string
 	cmd := cobra.Command{
 		Use:               use,
@@ -27,6 +27,7 @@ func (e *Executor) newGciCommand(use, short, long string, aliases []string, stdI
 				Debug:            *debug,
 				SkipGenerated:    *skipGenerated,
 				CustomOrder:      *customOrder,
+				FormatAlways:     *formatAlways,
 			}
 			gciCfg, err := config.YamlConfig{Cfg: fmtCfg, SectionStrings: *sectionStrings, SectionSeparatorStrings: *sectionSeparatorStrings}.Parse()
 			if err != nil {
@@ -46,6 +47,7 @@ func (e *Executor) newGciCommand(use, short, long string, aliases []string, stdI
 	e.rootCmd.AddCommand(&cmd)
 
 	debug = cmd.Flags().BoolP("debug", "d", false, "Enables debug output from the formatter")
+	formatAlways = cmd.Flags().Bool("format-always", false, "Format the file even if no imports blocks are defined. The default value is false.")
 
 	sectionHelp := `Sections define how inputs will be processed. Section names are case-insensitive and may contain parameters in (). The section order is standard > default > custom > blank > dot. The default value is [standard,default].
 standard - standard section that Go provides officially, like "fmt"

pkg/config/config.go

@@ -24,6 +24,7 @@ type BoolConfig struct {
 	Debug            bool `yaml:"-"`
 	SkipGenerated    bool `yaml:"skipGenerated"`
 	CustomOrder      bool `yaml:"customOrder"`
+	FormatAlways     bool `yaml:"formatAlways"`
 }
 
 type Config struct {

pkg/gci/gci.go

@@ -134,6 +134,9 @@ func LoadFormatGoFile(file io.FileObj, cfg config.Config) (src, dist []byte, err
 	imports, headEnd, tailStart, cStart, cEnd, err := parse.ParseFile(src, file.Path())
 	if err != nil {
 		if errors.Is(err, parse.NoImportError{}) {
+			if cfg.FormatAlways {
+				return GoFormat(src)
+			}
 			return src, src, nil
 		}
 		return nil, nil, err
@@ -210,6 +213,15 @@ func LoadFormatGoFile(file io.FileObj, cfg config.Config) (src, dist []byte, err
 	return src, dist, nil
 }
 
+func GoFormat(src []byte) ([]byte, []byte, error) {
+	dist, err := goFormat.Source(src)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return src, dist, nil
+}
+
 func AddIndent(in *[]byte, first *bool) {
 	if *first {
 		*first = false

pkg/gci/internal/testdata/format-always.cfg.yaml

@@ -0,0 +1 @@
+formatAlways: true

pkg/gci/internal/testdata/format-always.in.go

@@ -0,0 +1,5 @@
+package main
+
+func SomeFunc() error {
+return nil
+}

pkg/gci/internal/testdata/format-always.out.go

@@ -0,0 +1,5 @@
+package main
+
+func SomeFunc() error {
+	return nil
+}