feat: introduce theme management and performance improvements (#7)

cmd/root.go

@@ -3,11 +3,12 @@ package cmd
 import (
 	"fmt"
 	"os"
-	"github.com/karol-broda/snitch/internal/config"
 
+	"github.com/karol-broda/snitch/internal/config"
 	"github.com/spf13/cobra"
 )
 
+
 var (
 	cfgFile string
 )
@@ -42,7 +43,7 @@ func init() {
 
 	// add top's flags to root so `snitch -l` works (defaults to top command)
 	cfg := config.Get()
-	rootCmd.Flags().StringVar(&topTheme, "theme", cfg.Defaults.Theme, "Theme for TUI (dark, light, mono, auto)")
+	rootCmd.Flags().StringVar(&topTheme, "theme", cfg.Defaults.Theme, "Theme for TUI (see 'snitch themes')")
 	rootCmd.Flags().DurationVarP(&topInterval, "interval", "i", 0, "Refresh interval (default 1s)")
 	rootCmd.Flags().BoolVar(&topResolveAddrs, "resolve-addrs", !cfg.Defaults.Numeric, "Resolve IP addresses to hostnames")
 	rootCmd.Flags().BoolVar(&topResolvePorts, "resolve-ports", false, "Resolve port numbers to service names")

cmd/themes.go

@@ -0,0 +1,24 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/karol-broda/snitch/internal/theme"
+	"github.com/spf13/cobra"
+)
+
+var themesCmd = &cobra.Command{
+	Use:   "themes",
+	Short: "List available themes",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("Available themes (default: %s):\n\n", theme.DefaultTheme)
+		for _, name := range theme.ListThemes() {
+			fmt.Printf("  %s\n", name)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(themesCmd)
+}
+

cmd/top.go

@@ -2,11 +2,11 @@ package cmd
 
 import (
 	"log"
-	"github.com/karol-broda/snitch/internal/config"
-	"github.com/karol-broda/snitch/internal/tui"
 	"time"
 
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/karol-broda/snitch/internal/config"
+	"github.com/karol-broda/snitch/internal/tui"
 	"github.com/spf13/cobra"
 )
 
@@ -60,7 +60,7 @@ func init() {
 	cfg := config.Get()
 
 	// top-specific flags
-	topCmd.Flags().StringVar(&topTheme, "theme", cfg.Defaults.Theme, "Theme for TUI (dark, light, mono, auto)")
+	topCmd.Flags().StringVar(&topTheme, "theme", cfg.Defaults.Theme, "Theme for TUI (see 'snitch themes')")
 	topCmd.Flags().DurationVarP(&topInterval, "interval", "i", time.Second, "Refresh interval")
 	topCmd.Flags().BoolVar(&topResolveAddrs, "resolve-addrs", !cfg.Defaults.Numeric, "Resolve IP addresses to hostnames")
 	topCmd.Flags().BoolVar(&topResolvePorts, "resolve-ports", false, "Resolve port numbers to service names")

internal/collector/collector_linux.go

@@ -11,21 +11,76 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
+	"sync/atomic"
 	"time"
 )
 
+// set SNITCH_DEBUG_TIMING=1 to enable timing diagnostics
+var debugTiming = os.Getenv("SNITCH_DEBUG_TIMING") != ""
+
+func logTiming(label string, start time.Time, extra ...string) {
+	if !debugTiming {
+		return
+	}
+	elapsed := time.Since(start)
+	if len(extra) > 0 {
+		fmt.Fprintf(os.Stderr, "[timing] %s: %v (%s)\n", label, elapsed, extra[0])
+	} else {
+		fmt.Fprintf(os.Stderr, "[timing] %s: %v\n", label, elapsed)
+	}
+}
+
+// userCache caches uid to username mappings to avoid repeated lookups
+var userCache = struct {
+	sync.RWMutex
+	m map[int]string
+}{m: make(map[int]string)}
+
+func lookupUsername(uid int) string {
+	userCache.RLock()
+	if username, exists := userCache.m[uid]; exists {
+		userCache.RUnlock()
+		return username
+	}
+	userCache.RUnlock()
+
+	start := time.Now()
+	username := strconv.Itoa(uid)
+	u, err := user.LookupId(strconv.Itoa(uid))
+	if err == nil && u != nil {
+		username = u.Username
+	}
+	elapsed := time.Since(start)
+	if debugTiming && elapsed > 10*time.Millisecond {
+		fmt.Fprintf(os.Stderr, "[timing] user.LookupId(%d) slow: %v\n", uid, elapsed)
+	}
+
+	userCache.Lock()
+	userCache.m[uid] = username
+	userCache.Unlock()
+
+	return username
+}
+
 // DefaultCollector implements the Collector interface using /proc filesystem
 type DefaultCollector struct{}
 
 // GetConnections fetches all network connections by parsing /proc files
 func (dc *DefaultCollector) GetConnections() ([]Connection, error) {
+	totalStart := time.Now()
+	defer func() { logTiming("GetConnections total", totalStart) }()
+
+	inodeStart := time.Now()
 	inodeMap, err := buildInodeToProcessMap()
+	logTiming("buildInodeToProcessMap", inodeStart, fmt.Sprintf("%d inodes", len(inodeMap)))
 	if err != nil {
 		return nil, fmt.Errorf("failed to build inode map: %w", err)
 	}
 
 	var connections []Connection
 
+	parseStart := time.Now()
 	tcpConns, err := parseProcNet("/proc/net/tcp", "tcp", 4, inodeMap)
 	if err == nil {
 		connections = append(connections, tcpConns...)
@@ -45,6 +100,7 @@ func (dc *DefaultCollector) GetConnections() ([]Connection, error) {
 	if err == nil {
 		connections = append(connections, udpConns6...)
 	}
+	logTiming("parseProcNet (all)", parseStart, fmt.Sprintf("%d connections", len(connections)))
 
 	return connections, nil
 }
@@ -71,9 +127,13 @@ type processInfo struct {
 	user    string
 }
 
-func buildInodeToProcessMap() (map[int64]*processInfo, error) {
-	inodeMap := make(map[int64]*processInfo)
+type inodeEntry struct {
+	inode int64
+	info  *processInfo
+}
 
+func buildInodeToProcessMap() (map[int64]*processInfo, error) {
+	readDirStart := time.Now()
 	procDir, err := os.Open("/proc")
 	if err != nil {
 		return nil, err
@@ -85,47 +145,103 @@ func buildInodeToProcessMap() (map[int64]*processInfo, error) {
 		return nil, err
 	}
 
+	// collect pids first
+	pids := make([]int, 0, len(entries))
 	for _, entry := range entries {
 		if !entry.IsDir() {
 			continue
 		}
+		pid, err := strconv.Atoi(entry.Name())
+		if err != nil {
+			continue
+		}
+		pids = append(pids, pid)
+	}
+	logTiming("  readdir /proc", readDirStart, fmt.Sprintf("%d pids", len(pids)))
 
-		pidStr := entry.Name()
-		pid, err := strconv.Atoi(pidStr)
+	// process pids in parallel with limited concurrency
+	scanStart := time.Now()
+	const numWorkers = 8
+	pidChan := make(chan int, len(pids))
+	resultChan := make(chan []inodeEntry, len(pids))
+
+	var totalFDs atomic.Int64
+	var wg sync.WaitGroup
+	for i := 0; i < numWorkers; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for pid := range pidChan {
+				entries := scanProcessSockets(pid)
+				if len(entries) > 0 {
+					totalFDs.Add(int64(len(entries)))
+					resultChan <- entries
+				}
+			}
+		}()
+	}
+
+	for _, pid := range pids {
+		pidChan <- pid
+	}
+	close(pidChan)
+
+	go func() {
+		wg.Wait()
+		close(resultChan)
+	}()
+
+	inodeMap := make(map[int64]*processInfo)
+	for entries := range resultChan {
+		for _, e := range entries {
+			inodeMap[e.inode] = e.info
+		}
+	}
+	logTiming("  scan all processes", scanStart, fmt.Sprintf("%d socket fds scanned", totalFDs.Load()))
+
+	return inodeMap, nil
+}
+
+func scanProcessSockets(pid int) []inodeEntry {
+	start := time.Now()
+
+	procInfo, err := getProcessInfo(pid)
+	if err != nil {
+		return nil
+	}
+
+	pidStr := strconv.Itoa(pid)
+	fdDir := filepath.Join("/proc", pidStr, "fd")
+	fdEntries, err := os.ReadDir(fdDir)
+	if err != nil {
+		return nil
+	}
+
+	var results []inodeEntry
+	for _, fdEntry := range fdEntries {
+		fdPath := filepath.Join(fdDir, fdEntry.Name())
+		link, err := os.Readlink(fdPath)
 		if err != nil {
 			continue
 		}
 
-		procInfo, err := getProcessInfo(pid)
-		if err != nil {
-			continue
-		}
-
-		fdDir := filepath.Join("/proc", pidStr, "fd")
-		fdEntries, err := os.ReadDir(fdDir)
-		if err != nil {
-			continue
-		}
-
-		for _, fdEntry := range fdEntries {
-			fdPath := filepath.Join(fdDir, fdEntry.Name())
-			link, err := os.Readlink(fdPath)
+		if strings.HasPrefix(link, "socket:[") && strings.HasSuffix(link, "]") {
+			inodeStr := link[8 : len(link)-1]
+			inode, err := strconv.ParseInt(inodeStr, 10, 64)
 			if err != nil {
 				continue
 			}
-
-			if strings.HasPrefix(link, "socket:[") && strings.HasSuffix(link, "]") {
-				inodeStr := link[8 : len(link)-1]
-				inode, err := strconv.ParseInt(inodeStr, 10, 64)
-				if err != nil {
-					continue
-				}
-				inodeMap[inode] = procInfo
-			}
+			results = append(results, inodeEntry{inode: inode, info: procInfo})
 		}
 	}
 
-	return inodeMap, nil
+	elapsed := time.Since(start)
+	if debugTiming && elapsed > 20*time.Millisecond {
+		fmt.Fprintf(os.Stderr, "[timing] slow process scan: pid=%d (%s) fds=%d time=%v\n",
+			pid, procInfo.command, len(fdEntries), elapsed)
+	}
+
+	return results
 }
 
 func getProcessInfo(pid int) (*processInfo, error) {
@@ -173,12 +289,7 @@ func getProcessInfo(pid int) (*processInfo, error) {
 				uid, err := strconv.Atoi(fields[1])
 				if err == nil {
 					info.uid = uid
-					u, err := user.LookupId(strconv.Itoa(uid))
-					if err == nil {
-						info.user = u.Username
-					} else {
-						info.user = strconv.Itoa(uid)
-					}
+					info.user = lookupUsername(uid)
 				}
 			}
 			break

internal/collector/collector_test.go

@@ -1,7 +1,10 @@
+//go:build linux
+
 package collector
 
 import (
 	"testing"
+	"time"
 )
 
 func TestGetConnections(t *testing.T) {
@@ -13,4 +16,102 @@ func TestGetConnections(t *testing.T) {
 
 	// connections are dynamic, so just verify function succeeded
 	t.Logf("Successfully got %d connections", len(conns))
+}
+
+func TestGetConnectionsPerformance(t *testing.T) {
+	// measures performance to catch regressions
+	// run with: go test -v -run TestGetConnectionsPerformance
+
+	const maxDuration = 500 * time.Millisecond
+	const iterations = 5
+
+	// warm up caches first
+	_, err := GetConnections()
+	if err != nil {
+		t.Fatalf("warmup failed: %v", err)
+	}
+
+	var total time.Duration
+	var maxSeen time.Duration
+
+	for i := 0; i < iterations; i++ {
+		start := time.Now()
+		conns, err := GetConnections()
+		elapsed := time.Since(start)
+
+		if err != nil {
+			t.Fatalf("iteration %d failed: %v", i, err)
+		}
+
+		total += elapsed
+		if elapsed > maxSeen {
+			maxSeen = elapsed
+		}
+
+		t.Logf("iteration %d: %v (%d connections)", i+1, elapsed, len(conns))
+	}
+
+	avg := total / time.Duration(iterations)
+	t.Logf("average: %v, max: %v", avg, maxSeen)
+
+	if maxSeen > maxDuration {
+		t.Errorf("slowest iteration took %v, expected < %v", maxSeen, maxDuration)
+	}
+}
+
+func TestGetConnectionsColdCache(t *testing.T) {
+	// tests performance with cold user cache
+	// this simulates first run or after cache invalidation
+
+	const maxDuration = 2 * time.Second
+
+	clearUserCache()
+
+	start := time.Now()
+	conns, err := GetConnections()
+	elapsed := time.Since(start)
+
+	if err != nil {
+		t.Fatalf("GetConnections() failed: %v", err)
+	}
+
+	t.Logf("cold cache: %v (%d connections, %d cached users after)",
+		elapsed, len(conns), userCacheSize())
+
+	if elapsed > maxDuration {
+		t.Errorf("cold cache took %v, expected < %v", elapsed, maxDuration)
+	}
+}
+
+func BenchmarkGetConnections(b *testing.B) {
+	// warm cache benchmark - measures typical runtime
+	// run with: go test -bench=BenchmarkGetConnections -benchtime=5s
+
+	// warm up
+	_, _ = GetConnections()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, _ = GetConnections()
+	}
+}
+
+func BenchmarkGetConnectionsColdCache(b *testing.B) {
+	// cold cache benchmark - measures worst-case with cache cleared each iteration
+	// run with: go test -bench=BenchmarkGetConnectionsColdCache -benchtime=10s
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		clearUserCache()
+		_, _ = GetConnections()
+	}
+}
+
+func BenchmarkBuildInodeMap(b *testing.B) {
+	// benchmarks just the inode map building (most expensive part)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, _ = buildInodeToProcessMap()
+	}
 }

internal/collector/collector_test_helpers_linux.go

@@ -0,0 +1,18 @@
+//go:build linux
+
+package collector
+
+// clearUserCache clears the user lookup cache for testing
+func clearUserCache() {
+	userCache.Lock()
+	userCache.m = make(map[int]string)
+	userCache.Unlock()
+}
+
+// userCacheSize returns the number of cached user entries
+func userCacheSize() int {
+	userCache.RLock()
+	defer userCache.RUnlock()
+	return len(userCache.m)
+}
+

internal/config/config.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 	"time"
 
+	"github.com/karol-broda/snitch/internal/theme"
 	"github.com/spf13/viper"
 )
 
@@ -92,7 +94,7 @@ func setDefaults(v *viper.Viper) {
 	v.SetDefault("defaults.interval", "1s")
 	v.SetDefault("defaults.numeric", false)
 	v.SetDefault("defaults.fields", []string{"pid", "process", "user", "proto", "state", "laddr", "lport", "raddr", "rport"})
-	v.SetDefault("defaults.theme", "auto")
+	v.SetDefault("defaults.theme", "ansi")
 	v.SetDefault("defaults.units", "auto")
 	v.SetDefault("defaults.color", "auto")
 	v.SetDefault("defaults.resolve", true)
@@ -127,7 +129,7 @@ func Get() *Config {
 					Interval:     "1s",
 					Numeric:      false,
 					Fields:       []string{"pid", "process", "user", "proto", "state", "laddr", "lport", "raddr", "rport"},
-					Theme:        "auto",
+					Theme:        "ansi",
 					Units:        "auto",
 					Color:        "auto",
 					Resolve:      true,
@@ -154,7 +156,9 @@ func (c *Config) GetInterval() time.Duration {
 
 // CreateExampleConfig creates an example configuration file
 func CreateExampleConfig(path string) error {
-	exampleConfig := `# snitch configuration file
+	themeList := strings.Join(theme.ListThemes(), ", ")
+
+	exampleConfig := fmt.Sprintf(`# snitch configuration file
 # See https://github.com/you/snitch for full documentation
 
 [defaults]
@@ -167,8 +171,9 @@ numeric = false
 # Default fields to display (comma-separated list)
 fields = ["pid", "process", "user", "proto", "state", "laddr", "lport", "raddr", "rport"]
 
-# Default theme for TUI (dark, light, mono, auto)
-theme = "auto"
+# Default theme for TUI (ansi inherits terminal colors)
+# Available: %s
+theme = "%s"
 
 # Default units for byte display (auto, si, iec)
 units = "auto"
@@ -187,17 +192,17 @@ ipv6 = false
 no_headers = false
 output_format = "table"
 sort_by = ""
-`
+`, themeList, theme.DefaultTheme)
 
 	// Ensure directory exists
 	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
 		return fmt.Errorf("failed to create config directory: %w", err)
 	}
-	
+
 	// Write config file
 	if err := os.WriteFile(path, []byte(exampleConfig), 0644); err != nil {
 		return fmt.Errorf("failed to write config file: %w", err)
 	}
-	
+
 	return nil
 }

internal/resolver/resolver.go

@@ -2,12 +2,16 @@ package resolver
 
 import (
 	"context"
+	"fmt"
 	"net"
+	"os"
 	"strconv"
 	"sync"
 	"time"
 )
 
+var debugTiming = os.Getenv("SNITCH_DEBUG_TIMING") != ""
+
 // Resolver handles DNS and service name resolution with caching and timeouts
 type Resolver struct {
 	timeout time.Duration
@@ -41,6 +45,7 @@ func (r *Resolver) ResolveAddr(addr string) string {
 	}
 
 	// Perform resolution with timeout
+	start := time.Now()
 	ctx, cancel := context.WithTimeout(context.Background(), r.timeout)
 	defer cancel()
 
@@ -55,6 +60,11 @@ func (r *Resolver) ResolveAddr(addr string) string {
 		}
 	}
 
+	elapsed := time.Since(start)
+	if debugTiming && elapsed > 50*time.Millisecond {
+		fmt.Fprintf(os.Stderr, "[timing] slow DNS lookup: %s -> %s (%v)\n", addr, resolved, elapsed)
+	}
+
 	// Cache the result
 	r.mutex.Lock()
 	r.cache[addr] = resolved

internal/theme/ansi.go

@@ -0,0 +1,24 @@
+package theme
+
+// ANSI palette uses standard terminal colors (0-15)
+// this allows the theme to inherit from the user's terminal color scheme
+var paletteANSI = Palette{
+	Name: "ansi",
+
+	Fg:       "15", // bright white
+	FgMuted:  "7",  // white
+	FgSubtle: "8",  // bright black (gray)
+	Bg:       "0",  // black
+	BgMuted:  "0",  // black
+	Border:   "8",  // bright black (gray)
+
+	Red:     "1",  // red
+	Green:   "2",  // green
+	Yellow:  "3",  // yellow
+	Blue:    "4",  // blue
+	Magenta: "5",  // magenta
+	Cyan:    "6",  // cyan
+	Orange:  "3",  // yellow (ansi has no orange, fallback to yellow)
+	Gray:    "8",  // bright black
+}
+

internal/theme/catppuccin.go

@@ -0,0 +1,87 @@
+package theme
+
+// catppuccin mocha (dark)
+// https://github.com/catppuccin/catppuccin
+var paletteCatppuccinMocha = Palette{
+	Name: "catppuccin-mocha",
+
+	Fg:       "#cdd6f4", // text
+	FgMuted:  "#a6adc8", // subtext0
+	FgSubtle: "#6c7086", // overlay0
+	Bg:       "#1e1e2e", // base
+	BgMuted:  "#313244", // surface0
+	Border:   "#45475a", // surface1
+
+	Red:     "#f38ba8",
+	Green:   "#a6e3a1",
+	Yellow:  "#f9e2af",
+	Blue:    "#89b4fa",
+	Magenta: "#cba6f7", // mauve
+	Cyan:    "#94e2d5", // teal
+	Orange:  "#fab387", // peach
+	Gray:    "#585b70", // surface2
+}
+
+// catppuccin macchiato (medium-dark)
+var paletteCatppuccinMacchiato = Palette{
+	Name: "catppuccin-macchiato",
+
+	Fg:       "#cad3f5", // text
+	FgMuted:  "#a5adcb", // subtext0
+	FgSubtle: "#6e738d", // overlay0
+	Bg:       "#24273a", // base
+	BgMuted:  "#363a4f", // surface0
+	Border:   "#494d64", // surface1
+
+	Red:     "#ed8796",
+	Green:   "#a6da95",
+	Yellow:  "#eed49f",
+	Blue:    "#8aadf4",
+	Magenta: "#c6a0f6", // mauve
+	Cyan:    "#8bd5ca", // teal
+	Orange:  "#f5a97f", // peach
+	Gray:    "#5b6078", // surface2
+}
+
+// catppuccin frappe (medium)
+var paletteCatppuccinFrappe = Palette{
+	Name: "catppuccin-frappe",
+
+	Fg:       "#c6d0f5", // text
+	FgMuted:  "#a5adce", // subtext0
+	FgSubtle: "#737994", // overlay0
+	Bg:       "#303446", // base
+	BgMuted:  "#414559", // surface0
+	Border:   "#51576d", // surface1
+
+	Red:     "#e78284",
+	Green:   "#a6d189",
+	Yellow:  "#e5c890",
+	Blue:    "#8caaee",
+	Magenta: "#ca9ee6", // mauve
+	Cyan:    "#81c8be", // teal
+	Orange:  "#ef9f76", // peach
+	Gray:    "#626880", // surface2
+}
+
+// catppuccin latte (light)
+var paletteCatppuccinLatte = Palette{
+	Name: "catppuccin-latte",
+
+	Fg:       "#4c4f69", // text
+	FgMuted:  "#6c6f85", // subtext0
+	FgSubtle: "#9ca0b0", // overlay0
+	Bg:       "#eff1f5", // base
+	BgMuted:  "#ccd0da", // surface0
+	Border:   "#bcc0cc", // surface1
+
+	Red:     "#d20f39",
+	Green:   "#40a02b",
+	Yellow:  "#df8e1d",
+	Blue:    "#1e66f5",
+	Magenta: "#8839ef", // mauve
+	Cyan:    "#179299", // teal
+	Orange:  "#fe640b", // peach
+	Gray:    "#acb0be", // surface2
+}
+

internal/theme/dracula.go

@@ -0,0 +1,24 @@
+package theme
+
+// dracula theme
+// https://draculatheme.com/
+var paletteDracula = Palette{
+	Name: "dracula",
+
+	Fg:       "#f8f8f2", // foreground
+	FgMuted:  "#f8f8f2", // foreground
+	FgSubtle: "#6272a4", // comment
+	Bg:       "#282a36", // background
+	BgMuted:  "#44475a", // selection
+	Border:   "#44475a", // selection
+
+	Red:     "#ff5555",
+	Green:   "#50fa7b",
+	Yellow:  "#f1fa8c",
+	Blue:    "#6272a4", // dracula uses comment color for blue tones
+	Magenta: "#bd93f9", // purple
+	Cyan:    "#8be9fd",
+	Orange:  "#ffb86c",
+	Gray:    "#6272a4", // comment
+}
+

internal/theme/gruvbox.go

@@ -0,0 +1,45 @@
+package theme
+
+// gruvbox dark
+// https://github.com/morhetz/gruvbox
+var paletteGruvboxDark = Palette{
+	Name: "gruvbox-dark",
+
+	Fg:       "#ebdbb2", // fg
+	FgMuted:  "#d5c4a1", // fg2
+	FgSubtle: "#a89984", // fg4
+	Bg:       "#282828", // bg
+	BgMuted:  "#3c3836", // bg1
+	Border:   "#504945", // bg2
+
+	Red:     "#fb4934",
+	Green:   "#b8bb26",
+	Yellow:  "#fabd2f",
+	Blue:    "#83a598",
+	Magenta: "#d3869b", // purple
+	Cyan:    "#8ec07c", // aqua
+	Orange:  "#fe8019",
+	Gray:    "#928374",
+}
+
+// gruvbox light
+var paletteGruvboxLight = Palette{
+	Name: "gruvbox-light",
+
+	Fg:       "#3c3836", // fg
+	FgMuted:  "#504945", // fg2
+	FgSubtle: "#7c6f64", // fg4
+	Bg:       "#fbf1c7", // bg
+	BgMuted:  "#ebdbb2", // bg1
+	Border:   "#d5c4a1", // bg2
+
+	Red:     "#cc241d",
+	Green:   "#98971a",
+	Yellow:  "#d79921",
+	Blue:    "#458588",
+	Magenta: "#b16286", // purple
+	Cyan:    "#689d6a", // aqua
+	Orange:  "#d65d0e",
+	Gray:    "#928374",
+}
+

internal/theme/mono.go

@@ -0,0 +1,49 @@
+package theme
+
+import "github.com/charmbracelet/lipgloss"
+
+// createMonoTheme creates a monochrome theme (no colors)
+// useful for accessibility, piping output, or minimal terminals
+func createMonoTheme() *Theme {
+	baseStyle := lipgloss.NewStyle()
+	boldStyle := lipgloss.NewStyle().Bold(true)
+
+	return &Theme{
+		Name: "mono",
+		Styles: Styles{
+			Header:     boldStyle,
+			Border:     baseStyle,
+			Selected:   boldStyle,
+			Watched:    boldStyle,
+			Normal:     baseStyle,
+			Error:      boldStyle,
+			Success:    boldStyle,
+			Warning:    boldStyle,
+			Footer:     baseStyle,
+			Background: baseStyle,
+
+			Proto: ProtoStyles{
+				TCP:  baseStyle,
+				UDP:  baseStyle,
+				Unix: baseStyle,
+				TCP6: baseStyle,
+				UDP6: baseStyle,
+			},
+
+			State: StateStyles{
+				Listen:      baseStyle,
+				Established: baseStyle,
+				TimeWait:    baseStyle,
+				CloseWait:   baseStyle,
+				SynSent:     baseStyle,
+				SynRecv:     baseStyle,
+				FinWait1:    baseStyle,
+				FinWait2:    baseStyle,
+				Closing:     baseStyle,
+				LastAck:     baseStyle,
+				Closed:      baseStyle,
+			},
+		},
+	}
+}
+

internal/theme/nord.go

@@ -0,0 +1,24 @@
+package theme
+
+// nord theme
+// https://www.nordtheme.com/
+var paletteNord = Palette{
+	Name: "nord",
+
+	Fg:       "#eceff4", // snow storm - nord6
+	FgMuted:  "#d8dee9", // snow storm - nord4
+	FgSubtle: "#4c566a", // polar night - nord3
+	Bg:       "#2e3440", // polar night - nord0
+	BgMuted:  "#3b4252", // polar night - nord1
+	Border:   "#434c5e", // polar night - nord2
+
+	Red:     "#bf616a", // aurora - nord11
+	Green:   "#a3be8c", // aurora - nord14
+	Yellow:  "#ebcb8b", // aurora - nord13
+	Blue:    "#81a1c1", // frost - nord9
+	Magenta: "#b48ead", // aurora - nord15
+	Cyan:    "#88c0d0", // frost - nord8
+	Orange:  "#d08770", // aurora - nord12
+	Gray:    "#4c566a", // polar night - nord3
+}
+

internal/theme/one_dark.go

@@ -0,0 +1,24 @@
+package theme
+
+// one dark theme (atom editor)
+// https://github.com/atom/atom/tree/master/packages/one-dark-syntax
+var paletteOneDark = Palette{
+	Name: "one-dark",
+
+	Fg:       "#abb2bf", // foreground
+	FgMuted:  "#9da5b4", // foreground muted
+	FgSubtle: "#5c6370", // comment
+	Bg:       "#282c34", // background
+	BgMuted:  "#21252b", // gutter background
+	Border:   "#3e4451", // selection
+
+	Red:     "#e06c75",
+	Green:   "#98c379",
+	Yellow:  "#e5c07b",
+	Blue:    "#61afef",
+	Magenta: "#c678dd", // purple
+	Cyan:    "#56b6c2",
+	Orange:  "#d19a66",
+	Gray:    "#5c6370", // comment
+}
+

internal/theme/palette.go

@@ -0,0 +1,111 @@
+package theme
+
+import (
+	"strconv"
+
+	"github.com/charmbracelet/lipgloss"
+)
+
+// Palette defines the semantic colors for a theme
+type Palette struct {
+	Name string
+
+	// base colors
+	Fg       string // primary foreground
+	FgMuted  string // secondary/muted foreground
+	FgSubtle string // subtle/disabled foreground
+	Bg       string // primary background
+	BgMuted  string // secondary background (selections, highlights)
+	Border   string // border color
+
+	// semantic colors
+	Red     string
+	Green   string
+	Yellow  string
+	Blue    string
+	Magenta string
+	Cyan    string
+	Orange  string
+	Gray    string
+}
+
+// Color converts a palette color string to a lipgloss.TerminalColor.
+// If the string is 1-2 characters, it's treated as an ANSI color code.
+// Otherwise, it's treated as a hex color.
+func (p *Palette) Color(c string) lipgloss.TerminalColor {
+	if c == "" {
+		return lipgloss.NoColor{}
+	}
+
+	if len(c) <= 2 {
+		n, err := strconv.Atoi(c)
+		if err == nil {
+			return lipgloss.ANSIColor(n)
+		}
+	}
+
+	return lipgloss.Color(c)
+}
+
+// ToTheme converts a Palette to a Theme with lipgloss styles
+func (p *Palette) ToTheme() *Theme {
+	return &Theme{
+		Name: p.Name,
+		Styles: Styles{
+			Header: lipgloss.NewStyle().
+				Bold(true).
+				Foreground(p.Color(p.Fg)),
+
+			Border: lipgloss.NewStyle().
+				Foreground(p.Color(p.Border)),
+
+			Selected: lipgloss.NewStyle().
+				Bold(true).
+				Foreground(p.Color(p.Fg)),
+
+			Watched: lipgloss.NewStyle().
+				Bold(true).
+				Foreground(p.Color(p.Orange)),
+
+			Normal: lipgloss.NewStyle().
+				Foreground(p.Color(p.FgMuted)),
+
+			Error: lipgloss.NewStyle().
+				Foreground(p.Color(p.Red)),
+
+			Success: lipgloss.NewStyle().
+				Foreground(p.Color(p.Green)),
+
+			Warning: lipgloss.NewStyle().
+				Foreground(p.Color(p.Yellow)),
+
+			Footer: lipgloss.NewStyle().
+				Foreground(p.Color(p.FgSubtle)),
+
+			Background: lipgloss.NewStyle(),
+
+			Proto: ProtoStyles{
+				TCP:  lipgloss.NewStyle().Foreground(p.Color(p.Green)),
+				UDP:  lipgloss.NewStyle().Foreground(p.Color(p.Magenta)),
+				Unix: lipgloss.NewStyle().Foreground(p.Color(p.Gray)),
+				TCP6: lipgloss.NewStyle().Foreground(p.Color(p.Cyan)),
+				UDP6: lipgloss.NewStyle().Foreground(p.Color(p.Blue)),
+			},
+
+			State: StateStyles{
+				Listen:      lipgloss.NewStyle().Foreground(p.Color(p.Green)),
+				Established: lipgloss.NewStyle().Foreground(p.Color(p.Blue)),
+				TimeWait:    lipgloss.NewStyle().Foreground(p.Color(p.Yellow)),
+				CloseWait:   lipgloss.NewStyle().Foreground(p.Color(p.Orange)),
+				SynSent:     lipgloss.NewStyle().Foreground(p.Color(p.Magenta)),
+				SynRecv:     lipgloss.NewStyle().Foreground(p.Color(p.Magenta)),
+				FinWait1:    lipgloss.NewStyle().Foreground(p.Color(p.Red)),
+				FinWait2:    lipgloss.NewStyle().Foreground(p.Color(p.Red)),
+				Closing:     lipgloss.NewStyle().Foreground(p.Color(p.Red)),
+				LastAck:     lipgloss.NewStyle().Foreground(p.Color(p.Red)),
+				Closed:      lipgloss.NewStyle().Foreground(p.Color(p.Gray)),
+			},
+		},
+	}
+}
+

internal/theme/readme.md

@@ -0,0 +1,14 @@
+# theme Palettes
+
+the color palettes in this directory were generated by an LLM agent (Claude Opus 4.5) using web search to fetch the official color specifications from each themes documentation
+as it is with llm agents its possible the colors may be wrong
+
+Sources:
+- [Catppuccin](https://github.com/catppuccin/catppuccin)
+- [Dracula](https://draculatheme.com/)
+- [Gruvbox](https://github.com/morhetz/gruvbox)
+- [Nord](https://www.nordtheme.com/)
+- [One Dark](https://github.com/atom/one-dark-syntax)
+- [Solarized](https://ethanschoonover.com/solarized/)
+- [Tokyo Night](https://github.com/enkia/tokyo-night-vscode-theme)
+

internal/theme/solarized.go

@@ -0,0 +1,45 @@
+package theme
+
+// solarized dark theme
+// https://ethanschoonover.com/solarized/
+var paletteSolarizedDark = Palette{
+	Name: "solarized-dark",
+
+	Fg:       "#839496", // base0
+	FgMuted:  "#93a1a1", // base1
+	FgSubtle: "#586e75", // base01
+	Bg:       "#002b36", // base03
+	BgMuted:  "#073642", // base02
+	Border:   "#073642", // base02
+
+	Red:     "#dc322f",
+	Green:   "#859900",
+	Yellow:  "#b58900",
+	Blue:    "#268bd2",
+	Magenta: "#d33682",
+	Cyan:    "#2aa198",
+	Orange:  "#cb4b16",
+	Gray:    "#657b83", // base00
+}
+
+// solarized light theme
+var paletteSolarizedLight = Palette{
+	Name: "solarized-light",
+
+	Fg:       "#657b83", // base00
+	FgMuted:  "#586e75", // base01
+	FgSubtle: "#93a1a1", // base1
+	Bg:       "#fdf6e3", // base3
+	BgMuted:  "#eee8d5", // base2
+	Border:   "#eee8d5", // base2
+
+	Red:     "#dc322f",
+	Green:   "#859900",
+	Yellow:  "#b58900",
+	Blue:    "#268bd2",
+	Magenta: "#d33682",
+	Cyan:    "#2aa198",
+	Orange:  "#cb4b16",
+	Gray:    "#839496", // base0
+}
+

internal/theme/theme.go

@@ -1,6 +1,7 @@
 package theme
 
 import (
+	"sort"
 	"strings"
 
 	"github.com/charmbracelet/lipgloss"
@@ -52,152 +53,73 @@ type StateStyles struct {
 	Closed      lipgloss.Style
 }
 
-var (
-	themes map[string]*Theme
-)
+var themes map[string]*Theme
 
 func init() {
-	themes = map[string]*Theme{
-		"default": createAdaptiveTheme(),
-		"mono":    createMonoTheme(),
-	}
+	themes = make(map[string]*Theme)
+
+	// ansi theme (default) - inherits from terminal colors
+	themes["ansi"] = paletteANSI.ToTheme()
+
+	// catppuccin variants
+	themes["catppuccin-mocha"] = paletteCatppuccinMocha.ToTheme()
+	themes["catppuccin-macchiato"] = paletteCatppuccinMacchiato.ToTheme()
+	themes["catppuccin-frappe"] = paletteCatppuccinFrappe.ToTheme()
+	themes["catppuccin-latte"] = paletteCatppuccinLatte.ToTheme()
+
+	// gruvbox variants
+	themes["gruvbox-dark"] = paletteGruvboxDark.ToTheme()
+	themes["gruvbox-light"] = paletteGruvboxLight.ToTheme()
+
+	// dracula
+	themes["dracula"] = paletteDracula.ToTheme()
+
+	// nord
+	themes["nord"] = paletteNord.ToTheme()
+
+	// tokyo night variants
+	themes["tokyo-night"] = paletteTokyoNight.ToTheme()
+	themes["tokyo-night-storm"] = paletteTokyoNightStorm.ToTheme()
+	themes["tokyo-night-light"] = paletteTokyoNightLight.ToTheme()
+
+	// solarized variants
+	themes["solarized-dark"] = paletteSolarizedDark.ToTheme()
+	themes["solarized-light"] = paletteSolarizedLight.ToTheme()
+
+	// one dark
+	themes["one-dark"] = paletteOneDark.ToTheme()
+
+	// monochrome (no colors)
+	themes["mono"] = createMonoTheme()
 }
 
-// GetTheme returns a theme by name, with auto-detection support
+// DefaultTheme is the theme used when none is specified
+const DefaultTheme = "ansi"
+
+// GetTheme returns a theme by name
 func GetTheme(name string) *Theme {
-	if name == "auto" {
-		// lipgloss handles adaptive colors, so we just return the default
-		return themes["default"]
+	if name == "" || name == "auto" || name == "default" {
+		return themes[DefaultTheme]
 	}
 
 	if theme, exists := themes[name]; exists {
 		return theme
 	}
 
-	// a specific theme was requested (e.g. "dark", "light"), but we now use adaptive
-	// so we can just return the default theme and lipgloss will handle it
-	if name == "dark" || name == "light" {
-		return themes["default"]
-	}
-
 	// fallback to default
-	return themes["default"]
+	return themes[DefaultTheme]
 }
 
-// ListThemes returns available theme names
+// ListThemes returns available theme names sorted alphabetically
 func ListThemes() []string {
-	var names []string
+	names := make([]string, 0, len(themes))
 	for name := range themes {
 		names = append(names, name)
 	}
+	sort.Strings(names)
 	return names
 }
 
-// createAdaptiveTheme creates a clean, minimal theme
-func createAdaptiveTheme() *Theme {
-	return &Theme{
-		Name: "default",
-		Styles: Styles{
-			Header: lipgloss.NewStyle().
-				Bold(true).
-				Foreground(lipgloss.AdaptiveColor{Light: "#1F2937", Dark: "#F9FAFB"}),
-
-			Watched: lipgloss.NewStyle().
-				Bold(true).
-				Foreground(lipgloss.AdaptiveColor{Light: "#D97706", Dark: "#F59E0B"}),
-
-			Border: lipgloss.NewStyle().
-				Foreground(lipgloss.AdaptiveColor{Light: "#D1D5DB", Dark: "#374151"}),
-
-			Selected: lipgloss.NewStyle().
-				Bold(true).
-				Foreground(lipgloss.AdaptiveColor{Light: "#1F2937", Dark: "#F9FAFB"}),
-
-			Normal: lipgloss.NewStyle().
-				Foreground(lipgloss.AdaptiveColor{Light: "#6B7280", Dark: "#9CA3AF"}),
-
-			Error: lipgloss.NewStyle().
-				Foreground(lipgloss.AdaptiveColor{Light: "#DC2626", Dark: "#F87171"}),
-
-			Success: lipgloss.NewStyle().
-				Foreground(lipgloss.AdaptiveColor{Light: "#059669", Dark: "#34D399"}),
-
-			Warning: lipgloss.NewStyle().
-				Foreground(lipgloss.AdaptiveColor{Light: "#D97706", Dark: "#FBBF24"}),
-
-			Footer: lipgloss.NewStyle().
-				Foreground(lipgloss.AdaptiveColor{Light: "#9CA3AF", Dark: "#6B7280"}),
-
-			Background: lipgloss.NewStyle(),
-
-			Proto: ProtoStyles{
-				TCP:  lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#059669", Dark: "#34D399"}),
-				UDP:  lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#7C3AED", Dark: "#A78BFA"}),
-				Unix: lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#6B7280", Dark: "#9CA3AF"}),
-				TCP6: lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#059669", Dark: "#34D399"}),
-				UDP6: lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#7C3AED", Dark: "#A78BFA"}),
-			},
-
-			State: StateStyles{
-				Listen:      lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#059669", Dark: "#34D399"}),
-				Established: lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#2563EB", Dark: "#60A5FA"}),
-				TimeWait:    lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#D97706", Dark: "#FBBF24"}),
-				CloseWait:   lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#D97706", Dark: "#FBBF24"}),
-				SynSent:     lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#7C3AED", Dark: "#A78BFA"}),
-				SynRecv:     lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#7C3AED", Dark: "#A78BFA"}),
-				FinWait1:    lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#DC2626", Dark: "#F87171"}),
-				FinWait2:    lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#DC2626", Dark: "#F87171"}),
-				Closing:     lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#DC2626", Dark: "#F87171"}),
-				LastAck:     lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#DC2626", Dark: "#F87171"}),
-				Closed:      lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#9CA3AF", Dark: "#6B7280"}),
-			},
-		},
-	}
-}
-
-// createMonoTheme creates a monochrome theme (no colors)
-func createMonoTheme() *Theme {
-	baseStyle := lipgloss.NewStyle()
-	boldStyle := lipgloss.NewStyle().Bold(true)
-
-	return &Theme{
-		Name: "mono",
-		Styles: Styles{
-			Header:     boldStyle,
-			Border:     baseStyle,
-			Selected:   boldStyle,
-			Normal:     baseStyle,
-			Error:      boldStyle,
-			Success:    boldStyle,
-			Warning:    boldStyle,
-			Footer:     baseStyle,
-			Background: baseStyle,
-
-			Proto: ProtoStyles{
-				TCP:  baseStyle,
-				UDP:  baseStyle,
-				Unix: baseStyle,
-				TCP6: baseStyle,
-				UDP6: baseStyle,
-			},
-
-			State: StateStyles{
-				Listen:      baseStyle,
-				Established: baseStyle,
-				TimeWait:    baseStyle,
-				CloseWait:   baseStyle,
-				SynSent:     baseStyle,
-				SynRecv:     baseStyle,
-				FinWait1:    baseStyle,
-				FinWait2:    baseStyle,
-				Closing:     baseStyle,
-				LastAck:     baseStyle,
-				Closed:      baseStyle,
-			},
-		},
-	}
-}
-
 // GetProtoStyle returns the appropriate style for a protocol
 func (s *Styles) GetProtoStyle(proto string) lipgloss.Style {
 	switch strings.ToLower(proto) {

internal/theme/tokyo_night.go

@@ -0,0 +1,66 @@
+package theme
+
+// tokyo night theme
+// https://github.com/enkia/tokyo-night-vscode-theme
+var paletteTokyoNight = Palette{
+	Name: "tokyo-night",
+
+	Fg:       "#c0caf5", // foreground
+	FgMuted:  "#a9b1d6", // foreground dark
+	FgSubtle: "#565f89", // comment
+	Bg:       "#1a1b26", // background
+	BgMuted:  "#24283b", // background highlight
+	Border:   "#414868", // border
+
+	Red:     "#f7768e",
+	Green:   "#9ece6a",
+	Yellow:  "#e0af68",
+	Blue:    "#7aa2f7",
+	Magenta: "#bb9af7", // purple
+	Cyan:    "#7dcfff",
+	Orange:  "#ff9e64",
+	Gray:    "#565f89", // comment
+}
+
+// tokyo night storm variant
+var paletteTokyoNightStorm = Palette{
+	Name: "tokyo-night-storm",
+
+	Fg:       "#c0caf5", // foreground
+	FgMuted:  "#a9b1d6", // foreground dark
+	FgSubtle: "#565f89", // comment
+	Bg:       "#24283b", // background (storm is slightly lighter)
+	BgMuted:  "#1f2335", // background dark
+	Border:   "#414868", // border
+
+	Red:     "#f7768e",
+	Green:   "#9ece6a",
+	Yellow:  "#e0af68",
+	Blue:    "#7aa2f7",
+	Magenta: "#bb9af7", // purple
+	Cyan:    "#7dcfff",
+	Orange:  "#ff9e64",
+	Gray:    "#565f89", // comment
+}
+
+// tokyo night light variant
+var paletteTokyoNightLight = Palette{
+	Name: "tokyo-night-light",
+
+	Fg:       "#343b58", // foreground
+	FgMuted:  "#565a6e", // foreground dark
+	FgSubtle: "#9699a3", // comment
+	Bg:       "#d5d6db", // background
+	BgMuted:  "#cbccd1", // background highlight
+	Border:   "#b4b5b9", // border
+
+	Red:     "#8c4351",
+	Green:   "#485e30",
+	Yellow:  "#8f5e15",
+	Blue:    "#34548a",
+	Magenta: "#5a4a78", // purple
+	Cyan:    "#0f4b6e",
+	Orange:  "#965027",
+	Gray:    "#9699a3", // comment
+}
+