fix: set absolute path to the credentials file

When creating the configuration file during the initialisation process
calculate the absolute path to the credentials file instead of the
relative path.

internal/config/config.go

@@ -71,7 +71,15 @@ func SaveDefaultConfigToFile(configDir string) error {
 	}
 	defer file.Close()
 
-	config := defaultConfig(configDir)
+	config := defaultConfig()
+
+	credentialsFilePath, err := utilities.AbsolutePath(defaultCredentialsConfigFile(configDir))
+	if err != nil {
+		return fmt.Errorf("unable to calculate the path to the credentials file: %w", err)
+	}
+
+	config.CredentialsFile = credentialsFilePath
+
 	encoder := json.NewEncoder(file)
 	encoder.SetIndent("", "    ")
 
@@ -86,11 +94,9 @@ func configFile(configDir string) string {
 	return filepath.Join(utilities.CalculateConfigDir(configDir), configFileName)
 }
 
-func defaultConfig(configDir string) Config {
+func defaultConfig() Config {
-	credentialsFilePath := defaultCredentialsConfigFile(configDir)
-
 	return Config{
-		CredentialsFile: credentialsFilePath,
+		CredentialsFile: "",
 		CacheDirectory:  "",
 		HTTP: HTTPConfig{
 			Timeout:      5,

internal/utilities/absolute.go

@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2024 Dan Anglin <d.n.i.anglin@gmail.com>
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package utilities
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func AbsolutePath(path string) (string, error) {
+	if strings.HasPrefix(path, "~") {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			return "", fmt.Errorf("unable to get user's home directory; %w", err)
+		}
+
+		path = filepath.Join(homeDir, path[1:])
+	}
+
+	absPath, err := filepath.Abs(path)
+	if err != nil {
+		return "", fmt.Errorf("unable to get the absolute path: %w", err)
+	}
+
+	return absPath, nil
+}