mod: Adjust the plug-in structure to make it more flexible

The PreInstall function only handles pre-installation information for the sdk, such as version number, download address, etc., except for the version number, which is not required.
The PostInstall function as an extension, such as compiling source code, etc.

internal/sdk.go

@@ -46,6 +46,10 @@ type Sdk struct {
 }
 
 func (b *Sdk) Install(version Version) error {
+	label := b.label(version)
+	if b.checkExists(version) {
+		return fmt.Errorf("%s is already installed", label)
+	}
 	installInfo, err := b.Plugin.PreInstall(version)
 	if err != nil {
 		return fmt.Errorf("plugin [PreInstall] method error: %w", err)
@@ -63,7 +67,9 @@ func (b *Sdk) Install(version Version) error {
 			_ = os.RemoveAll(newDirPath)
 		}
 	}()
-	label := b.label(mainSdk.Version)
+	// A second check is required because the plug-in may change the version number,
+	// for example, latest is resolved to a specific version number.
+	label = b.label(mainSdk.Version)
 	if b.checkExists(mainSdk.Version) {
 		return fmt.Errorf("%s is already installed", label)
 	}
@@ -91,25 +97,26 @@ func (b *Sdk) Install(version Version) error {
 			})
 		}
 	}
-	success = true
 	err = b.Plugin.PostInstall(newDirPath, installedSdkInfos)
 	if err != nil {
 		return fmt.Errorf("plugin [PostInstall] method error: %w", err)
 	}
+	success = true
 	pterm.Printf("Install %s success! \n", pterm.LightGreen(label))
 	pterm.Printf("Please use %s to use it.\n", pterm.LightBlue(fmt.Sprintf("vfox use %s", label)))
 	return nil
 }
 
 func (b *Sdk) moveLocalFile(info *Info, sdkDestPath string) (string, error) {
-	path := filepath.Join(sdkDestPath, info.Name+"-"+string(info.Version))
+	path := info.storagePath(sdkDestPath)
 	pterm.Printf("Moving %s to %s...\n", info.Path, path)
 	err := os.Rename(info.Path, path)
 	if err != nil {
 		return "", fmt.Errorf("failed to move file, err:%w", err)
 	}
 	return path, nil
 }
+
 func (b *Sdk) moveRemoteFile(info *Info, sdkDestPath string) (string, error) {
 	u, err := url.Parse(info.Path)
 	label := info.label()
@@ -138,7 +145,7 @@ func (b *Sdk) moveRemoteFile(info *Info, sdkDestPath string) (string, error) {
 		return "", fmt.Errorf("unknown file type")
 	}
 	pterm.Printf("Unpacking %s...\n", filePath)
-	path := filepath.Join(sdkDestPath, info.Name+"-"+string(info.Version))
+	path := info.storagePath(sdkDestPath)
 	err = decompressor.Decompress(path)
 	if err != nil {
 		fmt.Printf("Unpack failed, err:%s", err.Error())
@@ -148,6 +155,9 @@ func (b *Sdk) moveRemoteFile(info *Info, sdkDestPath string) (string, error) {
 }
 func (b *Sdk) preInstallSdk(info *Info, sdkDestPath string) (string, error) {
 	pterm.Printf("Preinstalling %s...\n", info.label())
+	if info.Path == "" {
+		return info.storagePath(sdkDestPath), nil
+	}
 	if strings.HasPrefix(info.Path, "https://") || strings.HasPrefix(info.Path, "http://") {
 		return b.moveRemoteFile(info, sdkDestPath)
 	} else {

internal/version.go

@@ -16,6 +16,8 @@
 
 package internal
 
+import "path/filepath"
+
 type Package struct {
 	Main       *Info
 	Additional []*Info
@@ -32,3 +34,7 @@ type Info struct {
 func (i *Info) label() string {
 	return i.Name + "@" + string(i.Version)
 }
+
+func (i *Info) storagePath(parentDir string) string {
+	return filepath.Join(parentDir, i.Name+"-"+string(i.Version))
+}

template.lua

@@ -21,25 +21,30 @@ PLUGIN = {
     updateUrl = "{URL}/sdk.lua",
 }
 
---- Return information about the specified version based on ctx.version, including version, download URL, etc.
+--- Returns some pre-installed information, such as version number, download address, local files, etc.
+--- If checksum is provided, vfox will automatically check it for you.
 --- @param ctx table
 --- @field ctx.version string User-input version
 --- @return table Version information
 function PLUGIN:PreInstall(ctx)
     return {
         --- Version number
         version = "xxx",
-        --- Download URL
+        --- remote URL or local file path [optional]
         url = "xxx",
-        --- SHA256 checksum
+        --- SHA256 checksum [optional]
         sha256 = "xxx",
         --- md5 checksum [optional]
         md5= "xxx",
+        --- sha1 checksum [optional]
+        sha1 = "xxx",
+        --- sha512 checksum [optional]
+        sha512 = "xx",
     }
 end
 
 --- Extension point, called after PreInstall, can perform additional operations,
---- such as file operations for the SDK installation directory
+--- such as file operations for the SDK installation directory or compile source code
 --- Currently can be left unimplemented!
 function PLUGIN:PostInstall(ctx)
     --- ctx.rootPath SDK installation directory