Add small UX improvements for databricks configure (#3608)

## Changes
1. Removed the default `https://` prefix in the Host input and always
prefixed it if the host input passed with the https://

<img width="366" height="66" alt="Screenshot 2025-09-15 at 16 19 32"
src="https://github.com/user-attachments/assets/8a7c42cd-9252-43c1-8201-baebcec680af"
/>


## Why
Small UX improvements/tweaks

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release,
add a separate entry in NEXT_CHANGELOG.md as part of your PR. -->

Author: andrewnester

cmd/configure/configure.go

@@ -18,15 +18,17 @@ func configureInteractive(cmd *cobra.Command, flags *configureFlags, cfg *config
 	// Ask user to specify the host if not already set.
 	if cfg.Host == "" {
 		prompt := cmdio.Prompt(ctx)
-		prompt.Label = "Databricks host"
-		prompt.Default = "https://"
+		prompt.Label = "Databricks workspace host (https://...)"
 		prompt.AllowEdit = true
-		prompt.Validate = validateHost
+		prompt.Validate = func(input string) error {
+			normalized := normalizeHost(input)
+			return validateHost(normalized)
+		}
 		out, err := prompt.Run()
 		if err != nil {
 			return err
 		}
-		cfg.Host = out
+		cfg.Host = normalizeHost(out)
 	}
 
 	// Ask user to specify the token is not already set.
@@ -110,14 +112,15 @@ The host must be specified with the --host flag or the DATABRICKS_HOST environme
 
 		// Populate configuration from flags (if set).
 		if flags.Host != "" {
-			cfg.Host = flags.Host
+			cfg.Host = normalizeHost(flags.Host)
 		}
 		if flags.Profile != "" {
 			cfg.Profile = flags.Profile
 		}
 
-		// Verify that the host is valid (if set).
+		// Normalize and verify that the host is valid (if set).
 		if cfg.Host != "" {
+			cfg.Host = normalizeHost(cfg.Host)
 			err = validateHost(cfg.Host)
 			if err != nil {
 				return err

cmd/configure/host.go

@@ -3,8 +3,29 @@ package configure
 import (
 	"errors"
 	"net/url"
+	"strings"
 )
 
+// normalizeHost normalizes host input to prevent double https:// prefixes.
+// If the input already starts with https://, it returns it as-is.
+// If the input doesn't start with https://, it prepends https://.
+func normalizeHost(input string) string {
+	input = strings.TrimSpace(input)
+	u, err := url.Parse(input)
+	// If the input is not a valid URL, return it as-is
+	if err != nil {
+		return input
+	}
+
+	// If it already starts with https:// or http://, return as-is
+	if u.Scheme == "https" || u.Scheme == "http" {
+		return input
+	}
+
+	// Otherwise, prepend https://
+	return "https://" + input
+}
+
 func validateHost(s string) error {
 	u, err := url.Parse(s)
 	if err != nil {

cmd/configure/host_test.go

@@ -6,6 +6,41 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestNormalizeHost(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		// Empty input
+		{"", "https://"},
+		{"   ", "https://"},
+
+		// Already has https://
+		{"https://example.databricks.com", "https://example.databricks.com"},
+		{"HTTPS://EXAMPLE.DATABRICKS.COM", "HTTPS://EXAMPLE.DATABRICKS.COM"},
+		{"https://example.databricks.com/", "https://example.databricks.com/"},
+
+		// Missing protocol (should add https://)
+		{"example.databricks.com", "https://example.databricks.com"},
+		{"  example.databricks.com  ", "https://example.databricks.com"},
+		{"subdomain.example.databricks.com", "https://subdomain.example.databricks.com"},
+
+		// Edge cases
+		{"https://", "https://"},
+		{"example.com", "https://example.com"},
+		{"https://example.databricks.com/path", "https://example.databricks.com/path"},
+		{"https://example.databricks.com/path/", "https://example.databricks.com/path/"},
+		{"http://localhost:8080", "http://localhost:8080"},
+	}
+
+	for _, test := range tests {
+		t.Run(test.input, func(t *testing.T) {
+			result := normalizeHost(test.input)
+			assert.Equal(t, test.expected, result)
+		})
+	}
+}
+
 func TestValidateHost(t *testing.T) {
 	var err error