fix: UI for filtering config options

Also added vim-like movement (hjkl, g, shift+g)
  h -> left
  j -> down
  k -> up
  l -> right
  g -> Go to first config
  shift+g -> Go to last config

app.go

@@ -41,7 +41,8 @@ type model struct {
 	Quitting              bool
 	Cancelled             bool
 	Screen                Screen
-	Config                map[int]Config
+	Config                []Config
+	VisibleConfig         []Config
 	FocusIndex            int
 	ParsedConfig          ParsedConfig
 	DryRun                bool
@@ -54,12 +55,6 @@ func initialModel(fileInfo os.FileInfo, absolutePath string) *model {
 	s.Spinner = spinner.Dot
 	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("205"))
 
-	cfg := make(map[int]Config)
-
-	for i := 0; i < len(Configs); i++ {
-		cfg[i] = Configs[i]
-	}
-
 	return &model{
 		IsDirectory:           fileInfo.IsDir(),
 		CurrentFileName:       fileInfo.Name(),
@@ -72,12 +67,23 @@ func initialModel(fileInfo os.FileInfo, absolutePath string) *model {
 		TotalProgressBar:      progress.New(progress.WithDefaultGradient()),
 		TotalProgress:         0.0,
 		Quitting:              false,
-		Config:                cfg,
+		Config:                Configs,
+		VisibleConfig:         getVisibleConfigs(Configs),
 		ErrQuit:               false,
 		ErrQuitMessage:        "",
 	}
 }
 
+func (m model) updateConfigFocusedOptions() {
+	for _, visCfg := range m.VisibleConfig {
+		for i := range m.Config {
+			if m.Config[i].Name == visCfg.Name {
+				m.Config[i].FocusedOption = visCfg.FocusedOption
+			}
+		}
+	}
+}
+
 func (m model) Init() tea.Cmd {
 	return tea.Batch(m.Spinner.Tick, initCfg)
 }
@@ -102,28 +108,34 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m, tea.Quit
 			case "enter", " ":
 				// parse config and switch to main screen if we're focused on the start button
-				if m.FocusIndex == len(Configs) {
+				if m.FocusIndex == len(m.VisibleConfig) {
 					return m, m.parseConfig(false)
 				}
 				// parse config, print it and exit
-				if m.FocusIndex == len(Configs)+1 {
+				if m.FocusIndex == len(m.VisibleConfig)+1 {
 					return m, m.parseConfig(true)
 				}
-			case "tab", "shift+tab", "up", "down":
-				if key == "up" || key == "shift+tab" {
+			case "g":
+				m.FocusIndex = 0
+			case "G":
+				m.FocusIndex = len(m.VisibleConfig) + 1
+			case "tab", "shift+tab", "up", "down", "j", "k":
+				if key == "up" || key == "shift+tab" || key == "k" {
 					m.FocusIndex--
 				} else {
 					m.FocusIndex++
 				}
 
-				if m.FocusIndex >= len(Configs)+2 {
+				if m.FocusIndex >= len(m.VisibleConfig)+2 {
 					m.FocusIndex = 0
 				} else if m.FocusIndex < 0 {
-					m.FocusIndex = len(Configs) + 1
+					m.FocusIndex = len(m.VisibleConfig) + 1
 				}
-			case "left", "right":
-				if cfg, ok := m.Config[m.FocusIndex]; ok {
-					if key == "right" {
+			case "left", "right", "h", "l":
+				// If we're not hovering a button
+				if m.FocusIndex < len(m.VisibleConfig) {
+					cfg := &m.VisibleConfig[m.FocusIndex]
+					if key == "right" || key == "l" {
 						cfg.FocusedOption++
 					} else {
 						cfg.FocusedOption--
@@ -135,7 +147,8 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 						cfg.FocusedOption = len(cfg.Opts) - 1
 					}
 
-					m.Config[m.FocusIndex] = cfg
+					m.updateConfigFocusedOptions()
+					m.VisibleConfig = getVisibleConfigs(m.Config)
 				}
 			}
 		case quitMsg:
@@ -224,7 +237,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, cmd
 }
 
-func parseConfig(cfg map[int]Config) ParsedConfig {
+func parseConfig(cfg []Config) ParsedConfig {
 	vEncoder := find(cfg, "Video Encoder")
 	aEncoder := find(cfg, "Audio Encoder")
 	preset := find(cfg, "Preset")
@@ -243,24 +256,11 @@ func parseConfig(cfg map[int]Config) ParsedConfig {
 func CfgScreenView(m model) string {
 	view := ""
 
-	config := parseConfig(m.Config)
-
-	for i, cfg := range Configs {
-		switch config.VideoEncoder {
-		case "copy", "librav1e":
-			if cfg.Name == "Preset" || cfg.Name == "Constant Rate Factor (CRF)" {
-				continue
-			}
-		case "libvpx-vp9", "libsvtav1":
-			if cfg.Name == "Preset" {
-				continue
-			}
-		}
-
+	for i, cfg := range m.VisibleConfig {
 		opts := ""
 
 		for j, opt := range cfg.Opts {
-			if m.Config[i].FocusedOption == j {
+			if m.VisibleConfig[i].FocusedOption == j {
 				opts += FocusedOption.Render(opt)
 			} else {
 				opts += BlurredOption.Render(opt)
@@ -278,13 +278,13 @@ func CfgScreenView(m model) string {
 		}
 	}
 
-	if m.FocusIndex == len(Configs) {
+	if m.FocusIndex == len(m.VisibleConfig) {
 		view += FocusedStartButton
 	} else {
 		view += BlurredStartButton
 	}
 
-	if m.FocusIndex == len(Configs)+1 {
+	if m.FocusIndex == len(m.VisibleConfig)+1 {
 		view += FocusedDryRunButton
 	} else {
 		view += BlurredDryRunButton

config.go

@@ -26,7 +26,7 @@ type ParsedConfig struct {
 	CRF            string
 }
 
-func find(cfgs map[int]Config, name string) Config {
+func find(cfgs []Config, name string) Config {
 	for _, cfg := range cfgs {
 		if cfg.Name == name {
 			return cfg
@@ -36,3 +36,33 @@ func find(cfgs map[int]Config, name string) Config {
 	err := fmt.Sprintf("Couldn't find requested cfg: %s", name)
 	panic(err)
 }
+
+func filter(cfgs []Config, names ...string) []Config {
+	filtered := make([]Config, 0)
+
+cfgloop:
+	for _, cfg := range cfgs {
+		for _, name := range names {
+			if cfg.Name == name {
+				continue cfgloop
+			}
+		}
+
+		filtered = append(filtered, cfg)
+	}
+
+	return filtered
+}
+
+func getVisibleConfigs(cfgs []Config) []Config {
+	parsed := parseConfig(cfgs)
+
+	switch parsed.VideoEncoder {
+	case "copy", "librav1e":
+		return filter(cfgs, "Preset", "Constant Rate Factor (CRF)")
+	case "libvpx-vp9", "libsvtav1":
+		return filter(cfgs, "Preset")
+	}
+
+	return cfgs
+}

config_test.go

@@ -0,0 +1,23 @@
+package main
+
+import "testing"
+
+func TestFilterConfigs(t *testing.T) {
+	cfgs := filter(Configs, "Preset", "Constant Rate Factor (CRF)")
+
+	for _, cfg := range cfgs {
+		if cfg.Name == "Preset" {
+			t.Fatalf("Failed to filter out config \"Preset\"")
+		} else if cfg.Name == "Constant Rate Factor (CRF)" {
+			t.Fatalf("Failed to filter out config \"Constant Rate Factor (CRF)\"")
+		}
+	}
+}
+
+func TestGetVisibleConfigs(t *testing.T) {
+	cfgs := getVisibleConfigs(Configs)
+
+	if len(cfgs) == len(Configs) {
+		t.Fatalf("Failed to get the correct visible configs. Expected VisibleConfigs len: %v. Got %v", 4, len(cfgs))
+	}
+}