feat(font): allow installing from a specific zip file folder

src/cli/font.go

@@ -11,7 +11,7 @@ import (
 )
 
 var (
-	ttf bool
+	zipFolder string
 
 	fontCmd = &cobra.Command{
 		Use:   "font [install|configure]",
@@ -47,7 +47,7 @@ This command is used to install fonts and configure the font in your terminal.
 
 				terminal.Init(env.Shell())
 
-				font.Run(fontName, env.Cache(), env.Root(), ttf)
+				font.Run(fontName, env.Cache(), env.Root(), zipFolder)
 
 				return
 			case "configure":
@@ -60,6 +60,6 @@ This command is used to install fonts and configure the font in your terminal.
 )
 
 func init() {
-	fontCmd.Flags().BoolVar(&ttf, "ttf", false, "fetch the TTF version of the font")
+	fontCmd.Flags().StringVar(&zipFolder, "zip-folder", "", "the folder inside the zip file to install fonts from")
 	RootCmd.AddCommand(fontCmd)
 }

src/font/cli.go

@@ -72,14 +72,14 @@ const (
 )
 
 type main struct {
-	err      error
-	list     *list.Model
-	font     string
-	families []string
-	spinner  spinner.Model
-	state    state
-	system   bool
-	ttf      bool
+	err       error
+	list      *list.Model
+	font      string
+	zipFolder string
+	families  []string
+	spinner   spinner.Model
+	state     state
+	system    bool
 }
 
 func (m *main) buildFontList(nerdFonts []*Asset) {
@@ -121,18 +121,18 @@ func downloadFontZip(location string) {
 	program.Send(zipMsg(zipFile))
 }
 
-func installLocalFontZIP(zipFile string, user, ttf bool) {
-	data, err := os.ReadFile(zipFile)
+func installLocalFontZIP(m *main) {
+	data, err := os.ReadFile(m.font)
 	if err != nil {
 		program.Send(errMsg(err))
 		return
 	}
 
-	installFontZIP(data, user, ttf)
+	installFontZIP(data, m)
 }
 
-func installFontZIP(zipFile []byte, user, ttf bool) {
-	families, err := InstallZIP(zipFile, user, ttf)
+func installFontZIP(zipFile []byte, m *main) {
+	families, err := InstallZIP(zipFile, m)
 	if err != nil {
 		program.Send(errMsg(err))
 		return
@@ -148,21 +148,30 @@ func (m *main) Init() tea.Cmd {
 
 	if len(m.font) != 0 && !isLocalZipFile() {
 		m.state = downloadFont
+
 		if !strings.HasPrefix(m.font, "https") {
-			m.font = fmt.Sprintf("https://github.com/ryanoasis/nerd-fonts/releases/latest/download/%s.zip", m.font)
+			if strings.HasPrefix(m.font, "CascadiaCode-") {
+				version := strings.TrimPrefix(m.font, "CascadiaCode-")
+				m.font = fmt.Sprintf("https://github.com/microsoft/cascadia-code/releases/download/v%s/%s.zip", version, m.font)
+			} else {
+				m.font = fmt.Sprintf("https://github.com/ryanoasis/nerd-fonts/releases/latest/download/%s.zip", m.font)
+			}
 		}
+
 		defer func() {
 			go downloadFontZip(m.font)
 		}()
+
 		m.spinner.Spinner = spinner.Globe
 		return m.spinner.Tick
 	}
 
 	defer func() {
 		if isLocalZipFile() {
-			go installLocalFontZIP(m.font, m.system, m.ttf)
+			go installLocalFontZIP(m)
 			return
 		}
+
 		go getFontsList()
 	}()
 
@@ -171,6 +180,7 @@ func (m *main) Init() tea.Cmd {
 	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("170"))
 	m.spinner = s
 	m.state = getFonts
+
 	if isLocalZipFile() {
 		m.state = unzipFont
 	}
@@ -240,7 +250,7 @@ func (m *main) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case zipMsg:
 		m.state = installFont
 		defer func() {
-			go installFontZIP(msg, m.system, m.ttf)
+			go installFontZIP(msg, m)
 		}()
 		m.spinner.Spinner = spinner.Dot
 		return m, m.spinner.Tick
@@ -288,6 +298,10 @@ func (m *main) View() string {
 	case quit:
 		return textStyle.Render(fmt.Sprintf("No need to install a new font? That's cool.%s", terminal.StopProgress()))
 	case done:
+		if len(m.families) == 0 {
+			return textStyle.Render(fmt.Sprintf("No matching font families were installed. Try setting --zip-folder to the correct folder when using Cascadia Code or a custom font zip file %s", terminal.StopProgress())) //nolint: lll
+		}
+
 		var builder strings.Builder
 
 		builder.WriteString(fmt.Sprintf("Successfully installed %s 🚀\n\n%s", m.font, terminal.StopProgress()))
@@ -307,11 +321,11 @@ func (m *main) View() string {
 	return ""
 }
 
-func Run(font string, ch cache_.Cache, root, ttf bool) {
+func Run(font string, ch cache_.Cache, root bool, zipFolder string) {
 	main := &main{
-		font:   font,
-		system: root,
-		ttf:    ttf,
+		font:      font,
+		system:    root,
+		zipFolder: zipFolder,
 	}
 
 	cache = ch

src/font/install.go

@@ -25,13 +25,7 @@ func contains[S ~[]E, E comparable](s S, e E) bool {
 	return false
 }
 
-func InstallZIP(data []byte, user, ttf bool) ([]string, error) {
-	// prefer OTF over TTF; otherwise prefer the first font we find
-	extension := ".otf"
-	if ttf {
-		extension = ".ttf"
-	}
-
+func InstallZIP(data []byte, m *main) ([]string, error) {
 	var families []string
 	bytesReader := bytes.NewReader(data)
 
@@ -42,46 +36,56 @@ func InstallZIP(data []byte, user, ttf bool) ([]string, error) {
 
 	fonts := make(map[string]*Font)
 
-	for _, zf := range zipReader.File {
+	root := len(m.zipFolder) == 0
+
+	for _, file := range zipReader.File {
 		// prevent zipslip attacks
 		// https://security.snyk.io/research/zip-slip-vulnerability
-		if strings.Contains(zf.Name, "..") {
+		// and only process files which are in the specified folder
+		if strings.Contains(file.Name, "..") || !strings.HasPrefix(file.Name, m.zipFolder) {
+			continue
+		}
+
+		fontFileName := path.Base(file.Name)
+
+		// do not install fonts that are not in the root folder when specified as such
+		if root && fontFileName != file.Name {
 			continue
 		}
 
-		rc, err := zf.Open()
+		fontReader, err := file.Open()
 		if err != nil {
-			return families, err
+			continue
 		}
 
-		defer rc.Close()
+		defer fontReader.Close()
 
-		data, err := io.ReadAll(rc)
+		fontBytes, err := io.ReadAll(fontReader)
 		if err != nil {
-			return families, err
+			continue
 		}
 
-		fontData, err := newFont(path.Base(zf.Name), data)
+		font, err := newFont(fontFileName, fontBytes)
 		if err != nil {
 			continue
 		}
 
-		if _, found := fonts[fontData.Name]; !found {
-			fonts[fontData.Name] = fontData
+		if _, found := fonts[font.Name]; !found {
+			fonts[font.Name] = font
 			continue
 		}
 
-		// respect the user's preference for TTF or OTF
-		first := strings.ToLower(path.Ext(fonts[fontData.Name].FileName))
-		second := strings.ToLower(path.Ext(fontData.FileName))
-		if first != second && second == extension {
-			fonts[fontData.Name] = fontData
+		// prefer .ttf files over other file types when we have a duplicate
+		first := strings.ToLower(path.Ext(fonts[font.Name].FileName))
+		second := strings.ToLower(path.Ext(font.FileName))
+		if first != second && second == ".ttf" {
+			fonts[font.Name] = font
 		}
 	}
 
 	for _, font := range fonts {
-		if err = install(font, user); err != nil {
-			return families, err
+		if err = install(font, m.system); err != nil {
+			continue
 		}
 
 		if found := contains(families, font.Family); !found {

website/docs/installation/fonts.mdx

@@ -34,6 +34,7 @@ Oh My Posh has a CLI to help you select and install a [Nerd Font][nerdfonts]:
 :::info
 When running as root/administrator, the fonts will be installed system-wide.
 When running as a regular user, the fonts will be installed in the user's font directory.
+By default, Oh My Posh installs the `.ttf` version of the font in case multiple versions are available.
 :::
 
 ```bash
@@ -46,10 +47,10 @@ This will present a list of Nerd Font libraries, from which you can  select `Mes
 oh-my-posh font install meslo
 ```
 
-By default, Oh My Posh installs the `.otf` version of the font. If you prefer the `.ttf` version, you can specify it with the `--ttf` flag:
+If you have a font that has specific flavors of a font inside sub folders, you can specify the sub folder name:
 
 ```bash
-oh-my-posh font install meslo --ttf
+oh-my-posh font install --zip-folder ttf/static CascadiaCode-2407.24
 ```
 
 </TabItem>