fix(path): validate index before assignment

resolves #3768

src/segments/path.go

@@ -249,7 +249,10 @@ func (pt *Path) getAgnosterPath() string {
 	for i := 1; i < n; i++ {
 		elements = append(elements, folderIcon)
 	}
-	elements = append(elements, splitted[n-1])
+
+	if len(splitted) > 0 {
+		elements = append(elements, splitted[n-1])
+	}
 
 	return pt.colorizePath(pt.root, elements)
 }
@@ -299,7 +302,10 @@ func (pt *Path) getLetterPath() string {
 		letter := pt.getRelevantLetter(splitted[i])
 		elements = append(elements, letter)
 	}
-	elements = append(elements, splitted[n-1])
+
+	if len(splitted) > 0 {
+		elements = append(elements, splitted[n-1])
+	}
 
 	return pt.colorizePath(pt.root, elements)
 }
@@ -349,7 +355,10 @@ func (pt *Path) getUniqueLettersPath(maxWidth int) string {
 			}
 		}
 	}
-	elements = append(elements, splitted[n-1])
+
+	if len(elements) > 0 {
+		elements = append(elements, splitted[n-1])
+	}
 
 	return pt.colorizePath(pt.root, elements)
 }
@@ -592,6 +601,10 @@ func (pt *Path) colorizePath(root string, elements []string) string {
 		return fmt.Sprintf("<%s>%s</>", cycle[0], element)
 	}
 
+	if len(elements) == 0 {
+		return colorizeElement(root)
+	}
+
 	colorizeSeparator := func() string {
 		if skipColorize || !colorSeparator {
 			return folderSeparator

src/segments/path_test.go

@@ -198,6 +198,14 @@ func TestAgnosterPathStyles(t *testing.T) {
 			PathSeparator:       "\\",
 			FolderSeparatorIcon: " > ",
 		},
+		{
+			Style:               Unique,
+			Expected:            "a",
+			HomePath:            homeDir,
+			Pwd:                 "/ab",
+			PathSeparator:       "/",
+			FolderSeparatorIcon: " > ",
+		},
 
 		{
 			Style:               Powerlevel,
@@ -350,6 +358,14 @@ func TestAgnosterPathStyles(t *testing.T) {
 			PathSeparator:       "\\",
 			FolderSeparatorIcon: " > ",
 		},
+		{
+			Style:               Letter,
+			Expected:            "w",
+			HomePath:            homeDir,
+			Pwd:                 "/whatever",
+			PathSeparator:       "/",
+			FolderSeparatorIcon: " > ",
+		},
 
 		{
 			Style:               Mixed,
@@ -1092,6 +1108,13 @@ func TestAgnosterPath(t *testing.T) {
 			Cycle:          []string{"blue", "yellow"},
 			ColorSeparator: true,
 		},
+		{
+			Case:          "Unix one level",
+			Expected:      "mnt",
+			Home:          homeDir,
+			PWD:           "/mnt",
+			PathSeparator: "/",
+		},
 	}
 
 	for _, tc := range cases {