feat: synchronize prompt colors with terminal background (#8)

cli/color/color.go

@@ -3,15 +3,15 @@ package color
 import "fmt"
 
 var (
-	reset  = "\033[0m"
-	red    = "\033[31m"
-	green  = "\033[32m"
-	yellow = "\033[33m"
-	blue   = "\033[34m"
-	purple = "\033[35m"
-	cyan   = "\033[36m"
-	gray   = "\033[37m"
-	white  = "\033[97m"
+	reset   = "\033[0m"
+	red     = "\033[31m"
+	green   = "\033[32m"
+	yellow  = "\033[33m"
+	blue    = "\033[34m"
+	magenta = "\033[35m"
+	cyan    = "\033[36m"
+	gray    = "\033[37m"
+	white   = "\033[97m"
 )
 
 // Red adds red color to str in terminal.
@@ -34,9 +34,9 @@ func Blue(str string) string {
 	return fmt.Sprintf("%s%s%s", blue, str, reset)
 }
 
-// Purple adds purple color to str in terminal.
-func Purple(str string) string {
-	return fmt.Sprintf("%s%s%s", purple, str, reset)
+// Magenta adds magenta color to str in terminal.
+func Magenta(str string) string {
+	return fmt.Sprintf("%s%s%s", magenta, str, reset)
 }
 
 // Cyan adds cyan color to str in terminal.

cli/prompt.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/muesli/termenv"
 	"github.com/reugn/gemini-cli/cli/color"
 )
 
@@ -19,13 +20,35 @@ type prompt struct {
 	cli      string
 }
 
+type promptColor struct {
+	user   func(string) string
+	gemini func(string) string
+	cli    func(string) string
+}
+
+func newPromptColor() *promptColor {
+	if termenv.HasDarkBackground() {
+		return &promptColor{
+			user:   color.Cyan,
+			gemini: color.Green,
+			cli:    color.Yellow,
+		}
+	}
+	return &promptColor{
+		user:   color.Blue,
+		gemini: color.Green,
+		cli:    color.Magenta,
+	}
+}
+
 func newPrompt(currentUser string) *prompt {
 	maxLength := maxLength(currentUser, geminiUser, cliUser)
+	pc := newPromptColor()
 	return &prompt{
-		user:     color.Blue(buildPrompt(currentUser, maxLength)),
-		userNext: color.Blue(buildPrompt(strings.Repeat(" ", len(currentUser)), maxLength)),
-		gemini:   color.Green(buildPrompt(geminiUser, maxLength)),
-		cli:      color.Yellow(buildPrompt(cliUser, maxLength)),
+		user:     pc.user(buildPrompt(currentUser, maxLength)),
+		userNext: pc.user(buildPrompt(strings.Repeat(" ", len(currentUser)), maxLength)),
+		gemini:   pc.gemini(buildPrompt(geminiUser, maxLength)),
+		cli:      pc.cli(buildPrompt(cliUser, maxLength)),
 	}
 }
 

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/charmbracelet/glamour v0.6.0
 	github.com/chzyer/readline v1.5.1
 	github.com/google/generative-ai-go v0.7.0
+	github.com/muesli/termenv v0.13.0
 	github.com/spf13/cobra v1.8.0
 	google.golang.org/api v0.149.0
 )
@@ -31,7 +32,6 @@ require (
 	github.com/mattn/go-runewidth v0.0.14 // indirect
 	github.com/microcosm-cc/bluemonday v1.0.21 // indirect
 	github.com/muesli/reflow v0.3.0 // indirect
-	github.com/muesli/termenv v0.13.0 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect