feat(golang-rewrite): create asdf where command

* Move `versions.ParseString` function to the toolversions package
* Create `toolversions.FormatForFS` function
* use new `toolversions.FormatForFS` function
* Create `asdf where` command
* Enable BATS tests for `asdf where` command

cmd/cmd.go

@@ -19,6 +19,7 @@ import (
 	"asdf/internal/plugins"
 	"asdf/internal/resolve"
 	"asdf/internal/shims"
+	"asdf/internal/toolversions"
 	"asdf/internal/versions"
 
 	"github.com/urfave/cli/v2"
@@ -175,6 +176,15 @@ func Execute(version string) {
 					return reshimCommand(logger, args.Get(0), args.Get(1))
 				},
 			},
+			{
+				Name: "where",
+				Action: func(cCtx *cli.Context) error {
+					tool := cCtx.Args().Get(0)
+					version := cCtx.Args().Get(1)
+
+					return whereCommand(logger, tool, version)
+				},
+			},
 			{
 				Name: "which",
 				Action: func(cCtx *cli.Context) error {
@@ -265,7 +275,7 @@ func getVersionInfo(conf config.Config, plugin plugins.Plugin, currentDir string
 	installed := false
 	if found {
 		firstVersion := toolversion.Versions[0]
-		versionType, version := versions.ParseString(firstVersion)
+		versionType, version := toolversions.Parse(firstVersion)
 		installed = installs.IsInstalled(conf, plugin, versionType, version)
 	}
 	return toolversion, found, installed
@@ -663,8 +673,68 @@ func whichCommand(logger *log.Logger, command string) error {
 	return nil
 }
 
+func whereCommand(logger *log.Logger, tool, version string) error {
+	conf, err := config.LoadConfig()
+	if err != nil {
+		logger.Printf("error loading config: %s", err)
+		return err
+	}
+
+	currentDir, err := os.Getwd()
+	if err != nil {
+		logger.Printf("unable to get current directory: %s", err)
+		return err
+	}
+
+	plugin := plugins.New(conf, tool)
+	err = plugin.Exists()
+	if err != nil {
+		if _, ok := err.(plugins.PluginMissing); ok {
+			logger.Printf("No such plugin: %s", tool)
+		}
+		return err
+	}
+
+	versionType, parsedVersion := toolversions.Parse(version)
+
+	if version == "" {
+		// resolve version
+		toolversions, found, err := resolve.Version(conf, plugin, currentDir)
+		if err != nil {
+			fmt.Printf("err %#+v\n", err)
+			return err
+		}
+
+		if found && len(toolversions.Versions) > 0 && installs.IsInstalled(conf, plugin, "version", toolversions.Versions[0]) {
+			installPath := installs.InstallPath(conf, plugin, "version", toolversions.Versions[0])
+			logger.Printf("%s", installPath)
+			return nil
+		}
+
+		// not found
+		msg := fmt.Sprintf("No version is set for %s; please run `asdf <global | shell | local> %s <version>`", tool, tool)
+		logger.Print(msg)
+		return errors.New(msg)
+	}
+
+	if version == "system" {
+		logger.Printf("System version is selected")
+		return errors.New("System version is selected")
+	}
+
+	if !installs.IsInstalled(conf, plugin, versionType, parsedVersion) {
+		logger.Printf("Version not installed")
+		return errors.New("Version not installed")
+	}
+
+	installPath := installs.InstallPath(conf, plugin, versionType, parsedVersion)
+	logger.Printf("%s", installPath)
+
+	return nil
+}
+
 func reshimToolVersion(conf config.Config, tool, version string, out io.Writer, errOut io.Writer) error {
-	versionType, version := versions.ParseString(version)
+	versionType, version := toolversions.Parse(version)
 	return shims.GenerateForVersion(conf, plugins.New(conf, tool), versionType, version, out, errOut)
 }
 

internal/help/help.go

@@ -10,7 +10,7 @@ import (
 
 	"asdf/internal/config"
 	"asdf/internal/plugins"
-	"asdf/internal/versions"
+	"asdf/internal/toolversions"
 )
 
 //go:embed help.txt
@@ -80,7 +80,7 @@ func writePluginHelp(conf config.Config, toolName, toolVersion string, writer io
 	}
 
 	if toolVersion != "" {
-		versionType, version := versions.ParseString(toolVersion)
+		versionType, version := toolversions.Parse(toolVersion)
 		env["ASDF_INSTALL_VERSION"] = version
 		env["ASDF_INSTALL_TYPE"] = versionType
 	}

internal/installs/installs.go

@@ -10,6 +10,7 @@ import (
 
 	"asdf/internal/config"
 	"asdf/internal/plugins"
+	"asdf/internal/toolversions"
 )
 
 const (
@@ -45,7 +46,8 @@ func InstallPath(conf config.Config, plugin plugins.Plugin, versionType, version
 	if versionType == "path" {
 		return version
 	}
-	return filepath.Join(pluginInstallPath(conf, plugin), version)
+
+	return filepath.Join(pluginInstallPath(conf, plugin), toolversions.FormatForFS(versionType, version))
 }
 
 // DownloadPath returns the download path for a particular plugin and version
@@ -53,7 +55,8 @@ func DownloadPath(conf config.Config, plugin plugins.Plugin, versionType, versio
 	if versionType == "path" {
 		return ""
 	}
-	return filepath.Join(conf.DataDir, dataDirDownloads, plugin.Name, version)
+
+	return filepath.Join(conf.DataDir, dataDirDownloads, plugin.Name, toolversions.FormatForFS(versionType, version))
 }
 
 // IsInstalled checks if a specific version of a tool is installed

internal/toolversions/toolversions.go

@@ -1,8 +1,10 @@
 // Package toolversions handles reading and writing tools and versions from
-// asdf's .tool-versions files
+// asdf's .tool-versions files. It also handles parsing version strings from
+// .tool-versions files and command line arguments.
 package toolversions
 
 import (
+	"fmt"
 	"os"
 	"slices"
 	"strings"
@@ -81,6 +83,39 @@ func Unique(versions []ToolVersions) (uniques []ToolVersions) {
 	return uniques
 }
 
+// Parse parses a version string into versionType and version components
+func Parse(version string) (string, string) {
+	segments := strings.Split(version, ":")
+	if len(segments) >= 1 {
+		remainder := strings.Join(segments[1:], ":")
+		switch segments[0] {
+		case "ref":
+			return "ref", remainder
+		case "path":
+			// This is for people who have the local source already compiled
+			// Like those who work on the language, etc
+			// We'll allow specifying path:/foo/bar/project in .tool-versions
+			// And then use the binaries there
+			return "path", remainder
+		default:
+			return "version", version
+		}
+	}
+
+	return "version", version
+}
+
+// FormatForFS takes a versionType and version strings and generate a version
+// string suitable for the file system
+func FormatForFS(versionType, version string) string {
+	switch versionType {
+	case "ref":
+		return fmt.Sprintf("ref-%s", version)
+	default:
+		return version
+	}
+}
+
 // readLines reads all the lines in a given file
 // removing spaces and comments which are marked by '#'
 func readLines(content string) (lines []string) {

internal/toolversions/toolversions_test.go

@@ -157,3 +157,33 @@ func TestgetAllToolsAndVersionsInContent(t *testing.T) {
 		})
 	}
 }
+
+func TestParse(t *testing.T) {
+	t.Run("returns 'version', and unmodified version when passed semantic version", func(t *testing.T) {
+		versionType, version := Parse("1.2.3")
+		assert.Equal(t, versionType, "version")
+		assert.Equal(t, version, "1.2.3")
+	})
+
+	t.Run("returns 'ref' and reference version when passed a ref version", func(t *testing.T) {
+		versionType, version := Parse("ref:abc123")
+		assert.Equal(t, versionType, "ref")
+		assert.Equal(t, version, "abc123")
+	})
+
+	t.Run("returns 'ref' and empty string when passed 'ref:'", func(t *testing.T) {
+		versionType, version := Parse("ref:")
+		assert.Equal(t, versionType, "ref")
+		assert.Equal(t, version, "")
+	})
+}
+
+func TestFormatForFS(t *testing.T) {
+	t.Run("returns version when version type is not ref", func(t *testing.T) {
+		assert.Equal(t, FormatForFS("version", "foobar"), "foobar")
+	})
+
+	t.Run("returns version prefixed with 'ref-' when version type is ref", func(t *testing.T) {
+		assert.Equal(t, FormatForFS("ref", "foobar"), "ref-foobar")
+	})
+}

internal/versions/versions.go

@@ -16,6 +16,7 @@ import (
 	"asdf/internal/plugins"
 	"asdf/internal/resolve"
 	"asdf/internal/shims"
+	"asdf/internal/toolversions"
 )
 
 const (
@@ -131,7 +132,7 @@ func InstallOneVersion(conf config.Config, plugin plugins.Plugin, version string
 		return UninstallableVersionError{versionType: "system"}
 	}
 
-	versionType, version := ParseString(version)
+	versionType, version := toolversions.Parse(version)
 
 	if versionType == "path" {
 		return UninstallableVersionError{versionType: "path"}
@@ -306,25 +307,3 @@ func parseVersions(rawVersions string) []string {
 	}
 	return versions
 }
-
-// ParseString parses a version string into versionType and version components
-func ParseString(version string) (string, string) {
-	segments := strings.Split(version, ":")
-	if len(segments) >= 1 {
-		remainder := strings.Join(segments[1:], ":")
-		switch segments[0] {
-		case "ref":
-			return "ref", remainder
-		case "path":
-			// This is for people who have the local source already compiled
-			// Like those who work on the language, etc
-			// We'll allow specifying path:/foo/bar/project in .tool-versions
-			// And then use the binaries there
-			return "path", remainder
-		default:
-			return "version", version
-		}
-	}
-
-	return "version", version
-}

internal/versions/versions_test.go

@@ -308,26 +308,6 @@ func TestLatest(t *testing.T) {
 	})
 }
 
-func TestParseString(t *testing.T) {
-	t.Run("returns 'version', and unmodified version when passed semantic version", func(t *testing.T) {
-		versionType, version := ParseString("1.2.3")
-		assert.Equal(t, versionType, "version")
-		assert.Equal(t, version, "1.2.3")
-	})
-
-	t.Run("returns 'ref' and reference version when passed a ref version", func(t *testing.T) {
-		versionType, version := ParseString("ref:abc123")
-		assert.Equal(t, versionType, "ref")
-		assert.Equal(t, version, "abc123")
-	})
-
-	t.Run("returns 'ref' and empty string when passed 'ref:'", func(t *testing.T) {
-		versionType, version := ParseString("ref:")
-		assert.Equal(t, versionType, "ref")
-		assert.Equal(t, version, "")
-	})
-}
-
 func TestAllVersions(t *testing.T) {
 	pluginName := "list-all-test"
 	conf, _ := generateConfig(t)

main_test.go

@@ -95,9 +95,9 @@ func TestBatsTests(t *testing.T) {
 	//  runBatsFile(t, dir, "version_commands.bats")
 	//})
 
-	//t.Run("where_command", func(t *testing.T) {
-	//  runBatsFile(t, dir, "where_command.bats")
-	//})
+	t.Run("where_command", func(t *testing.T) {
+		runBatsFile(t, dir, "where_command.bats")
+	})
 
 	t.Run("which_command", func(t *testing.T) {
 		runBatsFile(t, dir, "which_command.bats")

test/where_command.bats

@@ -8,6 +8,7 @@ setup() {
   install_dummy_version 1.0
   install_dummy_version 2.1
   install_dummy_version ref-master
+  cd "$HOME" || exit
 }
 
 teardown() {