fix(path): correctly handle replaced paths for letter style

Author: aexvir

docs/docs/segment-path.md

@@ -111,4 +111,10 @@ for the folders to display is governed by the `mixed_threshold` property.
 
 ### Letter
 
-Works like `Full`, but will write every subfolder name using the first letter only.
+Works like `Full`, but will write every subfolder name using the first letter only, except when the folder name
+starts with a symbol or icon.
+
+- `folder` will be shortened to `f`
+- `.config` will be shortened to `.c`
+- `__pycache__` will be shortened to `__p`
+- `➼ folder` will be shortened to `➼ f`

src/segment_path.go

@@ -155,12 +155,20 @@ func (pt *path) getLetterPath() string {
 		if len(folder) == 0 {
 			continue
 		}
-		var letter string
-		if strings.HasPrefix(folder, ".") && len(folder) > 1 {
-			letter = folder[0:2]
-		} else {
-			letter = folder[0:1]
+
+		// check if there is at least a letter we can use
+		matches := findNamedRegexMatch(`(?P<letter>[\p{L}0-9]).*`, folder)
+
+		if matches == nil || matches["letter"] == "" {
+			// no letter found, keep the folder unchanged
+			buffer.WriteString(fmt.Sprintf("%s%s", folder, separator))
+			continue
 		}
+
+		letter := matches["letter"]
+		// handle non-letter characters before the first found letter
+		letter = folder[0:strings.Index(folder, letter)] + letter
+
 		buffer.WriteString(fmt.Sprintf("%s%s", letter, separator))
 	}
 	buffer.WriteString(splitted[len(splitted)-1])

src/segment_path_test.go

@@ -366,6 +366,13 @@ func TestAgnosterPathStyles(t *testing.T) {
 		{Style: Letter, Expected: "u > b > a > w > man", HomePath: "/usr/home", Pwd: "/usr/burp/ab/whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
 		{Style: Letter, Expected: "u > .b > a > w > man", HomePath: "/usr/home", Pwd: "/usr/.burp/ab/whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
 		{Style: Letter, Expected: "u > .b > a > .w > man", HomePath: "/usr/home", Pwd: "/usr/.burp/ab/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "u > .b > a > ._w > man", HomePath: "/usr/home", Pwd: "/usr/.burp/ab/._whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "u > .ä > ū > .w > man", HomePath: "/usr/home", Pwd: "/usr/.äufbau/ūmgebung/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "u > .b > 1 > .w > man", HomePath: "/usr/home", Pwd: "/usr/.burp/12345/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "u > .b > 1 > .w > man", HomePath: "/usr/home", Pwd: "/usr/.burp/12345abc/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "u > .b > __p > .w > man", HomePath: "/usr/home", Pwd: "/usr/.burp/__pycache__/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "➼ > .w > man", HomePath: "/usr/home", Pwd: "➼/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
+		{Style: Letter, Expected: "➼ s > .w > man", HomePath: "/usr/home", Pwd: "➼ something/.whatever/man", PathSeperator: "/", FolderSeparatorIcon: " > "},
 	}
 	for _, tc := range cases {
 		env := new(MockedEnvironment)