feat(font): cache font list

resolves #5300

.vscode/launch.json

@@ -155,6 +155,17 @@
         "upgrade"
       ]
     },
+    {
+      "name": "Font install",
+      "type": "go",
+      "request": "launch",
+      "mode": "debug",
+      "program": "${workspaceRoot}/src",
+      "args": [
+        "font",
+        "install"
+      ]
+    },
     {
       "type": "node",
       "request": "launch",

src/cache/cache.go

@@ -34,6 +34,13 @@ var (
 	TOGGLECACHE      = fmt.Sprintf("toggle_cache_%s", pid())
 	PROMPTCOUNTCACHE = fmt.Sprintf("prompt_count_cache_%s", pid())
 	ENGINECACHE      = fmt.Sprintf("engine_cache_%s", pid())
+	FONTLISTCACHE    = "font_list_cache"
+)
+
+const (
+	ONEDAY   = 1440
+	ONEWEEK  = 10080
+	ONEMONTH = 43200
 )
 
 type Entry struct {

src/cli/cache.go

@@ -35,11 +35,14 @@ You can do the following:
 			_ = cmd.Help()
 			return
 		}
+
 		env := &runtime.Terminal{
 			CmdFlags: &runtime.Flags{},
 		}
+
 		env.Init()
 		defer env.Close()
+
 		switch args[0] {
 		case "path":
 			fmt.Print(env.CachePath())

src/cli/font.go

@@ -35,13 +35,14 @@ This command is used to install fonts and configure the font in your terminal.
 				if len(args) > 1 {
 					fontName = args[1]
 				}
+
 				env := &runtime.Terminal{}
 				env.Init()
 				defer env.Close()
 
 				terminal.Init(env.Shell())
 
-				font.Run(fontName, env.Root())
+				font.Run(fontName, env)
 
 				return
 			case "configure":

src/font/cli.go

@@ -10,10 +10,14 @@ import (
 	"github.com/charmbracelet/bubbles/spinner"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
+	"github.com/jandedobbeleer/oh-my-posh/src/runtime"
 	"github.com/jandedobbeleer/oh-my-posh/src/terminal"
 )
 
-var program *tea.Program
+var (
+	program     *tea.Program
+	environment runtime.Environment
+)
 
 const listHeight = 14
 
@@ -114,6 +118,7 @@ func downloadFontZip(location string) {
 		program.Send(errMsg(err))
 		return
 	}
+
 	program.Send(zipMsg(zipFile))
 }
 
@@ -123,6 +128,7 @@ func installLocalFontZIP(zipFile string, user bool) {
 		program.Send(errMsg(err))
 		return
 	}
+
 	installFontZIP(data, user)
 }
 
@@ -132,6 +138,7 @@ func installFontZIP(zipFile []byte, user bool) {
 		program.Send(errMsg(err))
 		return
 	}
+
 	program.Send(successMsg(families))
 }
 
@@ -159,6 +166,7 @@ func (m *main) Init() tea.Cmd {
 		}
 		go getFontsList()
 	}()
+
 	s := spinner.New()
 	s.Spinner = spinner.Dot
 	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("170"))
@@ -167,6 +175,7 @@ func (m *main) Init() tea.Cmd {
 	if isLocalZipFile() {
 		m.state = unzipFont
 	}
+
 	return m.spinner.Tick
 }
 
@@ -245,6 +254,7 @@ func (m *main) View() string {
 	if m.err != nil {
 		return textStyle.Render(m.err.Error())
 	}
+
 	switch m.state {
 	case getFonts:
 		return textStyle.Render(fmt.Sprintf("%s Downloading font list%s", m.spinner.View(), terminal.StartProgress()))
@@ -260,8 +270,10 @@ func (m *main) View() string {
 		return textStyle.Render(fmt.Sprintf("No need to install a new font? That's cool.%s", terminal.StopProgress()))
 	case done:
 		var builder strings.Builder
+
 		builder.WriteString(fmt.Sprintf("Successfully installed %s 🚀\n\n%s", m.font, terminal.StopProgress()))
 		builder.WriteString("The following font families are now available for configuration:\n")
+
 		for i, family := range m.families {
 			builder.WriteString(fmt.Sprintf("  • %s", family))
 
@@ -269,16 +281,21 @@ func (m *main) View() string {
 				builder.WriteString("\n")
 			}
 		}
+
 		return textStyle.Render(builder.String())
 	}
+
 	return ""
 }
 
-func Run(font string, system bool) {
+func Run(font string, env runtime.Environment) {
 	main := &main{
 		font:   font,
-		system: system,
+		system: env.Root(),
 	}
+
+	environment = env
+
 	program = tea.NewProgram(main)
 	if _, err := program.Run(); err != nil {
 		print("Error running program: %v", err)

src/font/fonts.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/jandedobbeleer/oh-my-posh/src/cache"
 	"github.com/jandedobbeleer/oh-my-posh/src/runtime/http"
 )
 
@@ -26,6 +27,10 @@ type Asset struct {
 func (a Asset) FilterValue() string { return a.Name }
 
 func Fonts() ([]*Asset, error) {
+	if assets, err := getCachedFontData(); err == nil {
+		return assets, nil
+	}
+
 	assets, err := fetchFontAssets("ryanoasis/nerd-fonts")
 	if err != nil {
 		return nil, err
@@ -39,9 +44,43 @@ func Fonts() ([]*Asset, error) {
 	assets = append(assets, cascadiaCode...)
 	sort.Slice(assets, func(i, j int) bool { return assets[i].Name < assets[j].Name })
 
+	setCachedFontData(assets)
+
 	return assets, nil
 }
 
+func getCachedFontData() ([]*Asset, error) {
+	if environment == nil {
+		return nil, errors.New("environment not set")
+	}
+
+	list, OK := environment.Cache().Get(cache.FONTLISTCACHE)
+	if !OK {
+		return nil, errors.New("cache not found")
+	}
+
+	assets := make([]*Asset, 0)
+	err := json.Unmarshal([]byte(list), &assets)
+	if err != nil {
+		return nil, err
+	}
+
+	return assets, nil
+}
+
+func setCachedFontData(assets []*Asset) {
+	if environment == nil {
+		return
+	}
+
+	data, err := json.Marshal(assets)
+	if err != nil {
+		return
+	}
+
+	environment.Cache().Set(cache.FONTLISTCACHE, string(data), cache.ONEDAY)
+}
+
 func CascadiaCode() ([]*Asset, error) {
 	return fetchFontAssets("microsoft/cascadia-code")
 }