actionPaths: add windows volume support

.gitignore

@@ -1,5 +1,5 @@
-.vscode
-example/example
-example/cmd/_test_files/*.txt
 caraparse/caraparse
 docs/book
+example/cmd/_test_files/*.txt
+example/example
+.vscode

context.go

@@ -5,7 +5,9 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
+	"unicode"
 
 	"github.com/rsteube/carapace/internal/common"
 	"github.com/rsteube/carapace/internal/env"
@@ -114,14 +116,30 @@ func expandHome(s string) (string, error) {
 		if err != nil {
 			return "", err
 		}
+		home = filepath.ToSlash(home)
 		s = strings.Replace(s, "~/", home+"/", 1)
 	}
 	return s, nil
 }
 
+// hasVolumePrefix checks if given path has a volume prefix (only for GOOS=windows)
+func hasVolumePrefix(path string) bool {
+	switch {
+	case runtime.GOOS != "windows":
+		return false
+	case len(path) < 2:
+		return false
+	case unicode.IsLetter(rune(path[0])) && path[1] == ':':
+		return true
+	default:
+		return false
+	}
+}
+
 // Abs returns an absolute representation of path.
 func (c Context) Abs(path string) (string, error) {
-	if !strings.HasPrefix(path, "/") && !strings.HasPrefix(path, "~") { // path is relative
+	path = filepath.ToSlash(path)
+	if !strings.HasPrefix(path, "/") && !strings.HasPrefix(path, "~") && !hasVolumePrefix(path) { // path is relative
 		switch c.Dir {
 		case "":
 			path = "./" + path
@@ -135,10 +153,14 @@ func (c Context) Abs(path string) (string, error) {
 		return "", err
 	}
 
+	if len(path) == 2 && hasVolumePrefix(path) {
+		path += "/" // prevent `C:` -> `C:./current/working/directory`
+	}
 	result, err := filepath.Abs(path)
 	if err != nil {
 		return "", err
 	}
+	result = filepath.ToSlash(result)
 
 	if strings.HasSuffix(path, "/") && !strings.HasSuffix(result, "/") {
 		result += "/"

internalActions.go

@@ -14,19 +14,24 @@ import (
 
 func actionPath(fileSuffixes []string, dirOnly bool) Action {
 	return ActionCallback(func(c Context) Action {
+		if len(c.Value) == 2 && hasVolumePrefix(c.Value) {
+			// TODO should be fixed in Abs or wherever this is happening
+			return ActionValues(c.Value + "/") // prevent `C:` -> `C:.`
+		}
+
 		abs, err := c.Abs(c.Value)
 		if err != nil {
 			return ActionMessage(err.Error())
 		}
 
-		displayFolder := filepath.Dir(c.Value)
+		displayFolder := filepath.ToSlash(filepath.Dir(c.Value))
 		if displayFolder == "." {
 			displayFolder = ""
 		} else if !strings.HasSuffix(displayFolder, "/") {
 			displayFolder = displayFolder + "/"
 		}
 
-		actualFolder := filepath.Dir(abs)
+		actualFolder := filepath.ToSlash(filepath.Dir(abs))
 		files, err := ioutil.ReadDir(actualFolder)
 		if err != nil {
 			return ActionMessage(err.Error())