feat: Allow single file distribution download

README.md

@@ -57,12 +57,20 @@ nsd nodejs /path/
 
 ### Yarn (Currently only v1 supported)
 
-#### With specific version
+#### Full distribution
 
 ```bash
 nsd yarn /path/ --version 1.22.5
 ```
 
+#### Single file distribution
+
+This will download the single javascript file and move it into the download directory with the name supplied to `--single-file`
+
+```bash
+nsd yarn /path/ --version 1.22.5 --single-file yarn
+```
+
 ## How to build
 
 > Requires go version 1.15 or newer

go.sum

@@ -173,7 +173,6 @@ github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkU
 github.com/spf13/cobra v1.1.1 h1:KfztREH0tPxJJ+geloSLaAkaPkr4ki2Er5quFV1TDo4=
 github.com/spf13/cobra v1.1.1/go.mod h1:WnodtKOvamDL/PwE2M4iKs8aMDBZ5Q5klgD3qfVJQMI=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
-github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=

nsd/cmd/yarn.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"path"
 
 	"github.com/mholt/archiver/v3"
 	Checksum "github.com/researchgate/nodejs-simple-downloader/nsd/checksum"
@@ -14,6 +15,7 @@ import (
 
 var (
 	yarnVersion string
+	singleFile  string
 	yarnCommand = &cobra.Command{
 		Use:   "yarn [path]",
 		Short: "Download yarn to specific folder",
@@ -27,14 +29,17 @@ var (
 		RunE: func(cmd *cobra.Command, args []string) (err error) {
 			downloadPath := args[0]
 
-			// https://github.com/yarnpkg/yarn/releases/download/v'.$version.'/yarn-v'.$version.'.tar.gz
-
 			err = prepareYarnFlags()
 			if err != nil {
 				return
 			}
 
-			yarnURL := fmt.Sprintf("https://github.com/yarnpkg/yarn/releases/download/v%s/yarn-v%s.tar.gz", yarnVersion, yarnVersion)
+			yarnURL := fmt.Sprintf("https://github.com/yarnpkg/yarn/releases/download/v%s/yarn-", yarnVersion)
+			if singleFile != "" {
+				yarnURL = fmt.Sprintf(yarnURL+"%s.js", yarnVersion)
+			} else {
+				yarnURL = fmt.Sprintf(yarnURL+"v%s.tar.gz", yarnVersion)
+			}
 			yarnFilePath, err := Download.File(yarnURL)
 			if err != nil {
 				return
@@ -65,9 +70,23 @@ var (
 				return
 			}
 
-			tar := archiver.NewTarGz()
-			tar.StripComponents = 1
-			err = tar.Unarchive(yarnFilePath, downloadPath)
+			if singleFile != "" {
+				err = os.MkdirAll(downloadPath, 0755)
+				if err != nil {
+					return
+				}
+
+				destinationFilePath := path.Join(downloadPath, singleFile)
+				err = os.Rename(yarnFilePath, destinationFilePath)
+				if err != nil {
+					return err
+				}
+				err = os.Chmod(destinationFilePath, 0755)
+			} else {
+				tar := archiver.NewTarGz()
+				tar.StripComponents = 1
+				err = tar.Unarchive(yarnFilePath, downloadPath)
+			}
 
 			if err != nil {
 				return
@@ -88,5 +107,6 @@ func prepareYarnFlags() (err error) {
 
 func init() {
 	yarnCommand.Flags().StringVarP(&yarnVersion, "version", "v", "", "Which version to install")
+	yarnCommand.Flags().StringVarP(&singleFile, "single-file", "s", "", "Download only the single file distribution from yarn and save with the supplied name in the download path")
 	rootCmd.AddCommand(yarnCommand)
 }