Initial commit: Azure DevOps TUI client

A terminal-based user interface for browsing and managing Azure DevOps
work items. Features include:

- Browse work items with filtering by area, iteration, state, and type
- View work item details with markdown rendering
- Open work items in browser
- Create git branches from work items
- Update work item state
- Keyboard-driven navigation

🤖 Generated with [Claude Code](https://claude.ai/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/config/config.go

@@ -0,0 +1,142 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/viper"
+)
+
+// Config holds the application configuration
+type Config struct {
+	Organization string   `mapstructure:"organization"`
+	Project      string   `mapstructure:"project"`
+	Team         string   `mapstructure:"team"`
+	PAT          string   `mapstructure:"pat"`
+	Theme        string   `mapstructure:"theme"`
+	Defaults     Defaults `mapstructure:"defaults"`
+}
+
+// Defaults holds default filter settings
+type Defaults struct {
+	Sprint   string `mapstructure:"sprint"`
+	State    string `mapstructure:"state"`
+	Assigned string `mapstructure:"assigned"`
+}
+
+// Load loads the configuration from file and environment
+func Load() (*Config, error) {
+	v := viper.New()
+
+	// Set config file name and paths
+	v.SetConfigName("config")
+	v.SetConfigType("yaml")
+
+	// Add config paths
+	home, err := os.UserHomeDir()
+	if err == nil {
+		v.AddConfigPath(filepath.Join(home, ".config", "devops-tui"))
+	}
+	v.AddConfigPath(".")
+
+	// Set defaults
+	v.SetDefault("theme", "default")
+	v.SetDefault("defaults.sprint", "current")
+	v.SetDefault("defaults.state", "all")
+	v.SetDefault("defaults.assigned", "me")
+
+	// Read config file (ignore if not found)
+	if err := v.ReadInConfig(); err != nil {
+		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
+			return nil, fmt.Errorf("error reading config file: %w", err)
+		}
+	}
+
+	// Bind environment variables
+	v.SetEnvPrefix("")
+	v.AutomaticEnv()
+
+	// Map environment variables
+	v.BindEnv("pat", "AZURE_DEVOPS_PAT")
+	v.BindEnv("organization", "AZURE_DEVOPS_ORG")
+	v.BindEnv("project", "AZURE_DEVOPS_PROJECT")
+	v.BindEnv("team", "AZURE_DEVOPS_TEAM")
+
+	var cfg Config
+	if err := v.Unmarshal(&cfg); err != nil {
+		return nil, fmt.Errorf("error unmarshaling config: %w", err)
+	}
+
+	// Validate required fields
+	if cfg.Organization == "" {
+		return nil, fmt.Errorf("organization is required (set in config or AZURE_DEVOPS_ORG)")
+	}
+	if cfg.Project == "" {
+		return nil, fmt.Errorf("project is required (set in config or AZURE_DEVOPS_PROJECT)")
+	}
+	if cfg.Team == "" {
+		return nil, fmt.Errorf("team is required (set in config or AZURE_DEVOPS_TEAM)")
+	}
+	if cfg.PAT == "" {
+		return nil, fmt.Errorf("PAT is required (set in config or AZURE_DEVOPS_PAT)")
+	}
+
+	return &cfg, nil
+}
+
+// BaseURL returns the Azure DevOps API base URL
+func (c *Config) BaseURL() string {
+	return fmt.Sprintf("https://dev.azure.com/%s/%s/_apis", c.Organization, c.Project)
+}
+
+// TeamURL returns the Azure DevOps API URL for team-specific endpoints
+func (c *Config) TeamURL() string {
+	return fmt.Sprintf("https://dev.azure.com/%s/%s/%s/_apis", c.Organization, c.Project, c.Team)
+}
+
+// WebURL returns the Azure DevOps web URL for the project
+func (c *Config) WebURL() string {
+	return fmt.Sprintf("https://dev.azure.com/%s/%s", c.Organization, c.Project)
+}
+
+// CreateDefaultConfig creates a default config file
+func CreateDefaultConfig() error {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return err
+	}
+
+	configDir := filepath.Join(home, ".config", "devops-tui")
+	if err := os.MkdirAll(configDir, 0755); err != nil {
+		return err
+	}
+
+	configPath := filepath.Join(configDir, "config.yaml")
+
+	// Don't overwrite existing config
+	if _, err := os.Stat(configPath); err == nil {
+		return nil
+	}
+
+	content := `# Azure DevOps connection
+organization: "my-organization"
+project: "my-project"
+team: "my-team"
+
+# Authentication
+# PAT can be set here or via environment variable AZURE_DEVOPS_PAT
+pat: ""
+
+# UI settings
+theme: "default"  # default, dark, light
+
+# Default filters at startup
+defaults:
+  sprint: "current"      # "current", "all", or specific name
+  state: "all"           # "all", "new", "active", "resolved", "closed"
+  assigned: "me"         # "all", "me"
+`
+
+	return os.WriteFile(configPath, []byte(content), 0600)
+}