增加/context命令、Tab补全与输入历史，命令处理提取到internal/cli

internal/cli/complete.go

@@ -0,0 +1,35 @@
+package cli
+
+import "strings"
+
+var commands = []string{"/exit", "/quit", "/help", "/models", "/use", "/think", "/effort", "/context", "/info"}
+
+func Complete(line string, models []string) []string {
+	fields := strings.Fields(line)
+	switch len(fields) {
+	case 0:
+		return commands
+	case 1:
+		return prefixMatch(commands, fields[0])
+	}
+	arg := fields[1]
+	switch fields[0] {
+	case "/use":
+		return prefixMatch(models, arg)
+	case "/think":
+		return prefixMatch([]string{"on", "off"}, arg)
+	case "/effort":
+		return prefixMatch([]string{"low", "high", "max"}, arg)
+	}
+	return nil
+}
+
+func prefixMatch(list []string, prefix string) []string {
+	var out []string
+	for _, s := range list {
+		if strings.HasPrefix(s, prefix) {
+			out = append(out, s)
+		}
+	}
+	return out
+}