refactor: Rewrote in golang.

app/config.go

@@ -0,0 +1,207 @@
+package app
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"filippo.io/age"
+	"filippo.io/age/agessh"
+)
+
+type Config struct {
+	Keys       []SshKeyPair `json:"keys"`
+	ScanConfig scanConfig   `json:"scan"`
+}
+
+type SshKeyPair struct {
+	Private string `json:"private"` // Path to the private key file
+	Public  string `json:"public"`  // Path to the public key file
+}
+
+type scanConfig struct {
+	Matcher string `json:"matcher"`
+	Exclude string `json:"exclude"`
+	Include string `json:"include"`
+}
+
+// Create a fresh config with sensible defaults.
+func NewConfig(privateKeyPaths []string) Config {
+	var keys = []SshKeyPair{}
+
+	for _, priv := range privateKeyPaths {
+		var key = SshKeyPair{
+			Private: priv,
+			Public:  priv + ".pub",
+		}
+
+		keys = append(keys, key)
+	}
+
+	return Config{
+		Keys: keys,
+		ScanConfig: scanConfig{
+			Matcher: "\\.env",
+			Exclude: "*.envrc",
+			Include: "~",
+		},
+	}
+}
+
+// Read the Config from disk.
+func LoadConfig() (*Config, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, err
+	}
+
+	configPath := filepath.Join(homeDir, ".envr", "config.json")
+
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return nil, fmt.Errorf("No config file found. Please run `envr init` to generate one.")
+		} else {
+			return nil, err
+		}
+	}
+
+	var config Config
+	if err := json.Unmarshal(data, &config); err != nil {
+		return nil, err
+	}
+
+	return &config, nil
+}
+
+// Write the Config to disk.
+func (c *Config) Save() error {
+	// Create the ~/.envr directory
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return err
+	}
+	configDir := filepath.Join(homeDir, ".envr")
+	if err := os.MkdirAll(configDir, 0755); err != nil {
+		return err
+	}
+
+	configPath := filepath.Join(configDir, "config.json")
+
+	// Check if file exists and is not empty
+	if info, err := os.Stat(configPath); err == nil {
+		if info.Size() > 0 {
+			return os.ErrExist
+		}
+	}
+
+	data, err := json.MarshalIndent(c, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(configPath, data, 0644)
+}
+
+// Use fd to find all ignored .env files that match the config's parameters
+func (c Config) scan() (paths []string, err error) {
+	searchPath, err := c.searchPath()
+	if err != nil {
+		return []string{}, err
+	}
+
+	// Find all files (including ignored ones)
+	fmt.Printf("Searching for all files in \"%s\"...\n", searchPath)
+	allCmd := exec.Command("fd", "-a", c.ScanConfig.Matcher, "-E", c.ScanConfig.Exclude, "-HI", searchPath)
+	allOutput, err := allCmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+
+	allFiles := strings.Split(strings.TrimSpace(string(allOutput)), "\n")
+	if len(allFiles) == 1 && allFiles[0] == "" {
+		allFiles = []string{}
+	}
+
+	// Find unignored files
+	fmt.Printf("Search for unignored fies in \"%s\"...\n", searchPath)
+	unignoredCmd := exec.Command("fd", "-a", c.ScanConfig.Matcher, "-E", c.ScanConfig.Exclude, "-H", searchPath)
+	unignoredOutput, err := unignoredCmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+
+	unignoredFiles := strings.Split(strings.TrimSpace(string(unignoredOutput)), "\n")
+	if len(unignoredFiles) == 1 && unignoredFiles[0] == "" {
+		unignoredFiles = []string{}
+	}
+
+	// Create a map for faster lookup
+	unignoredMap := make(map[string]bool)
+	for _, file := range unignoredFiles {
+		unignoredMap[file] = true
+	}
+
+	// Filter to get only ignored files
+	var ignoredFiles []string
+	for _, file := range allFiles {
+		if !unignoredMap[file] {
+			ignoredFiles = append(ignoredFiles, file)
+		}
+	}
+
+	return ignoredFiles, nil
+}
+
+func (c Config) searchPath() (path string, err error) {
+	include := c.ScanConfig.Include
+
+	if include == "~" {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			return "", err
+		}
+		return homeDir, nil
+	}
+
+	absPath, err := filepath.Abs(include)
+	if err != nil {
+		return "", err
+	}
+
+	return absPath, nil
+}
+
+// TODO: Should this be private?
+func (s SshKeyPair) Identity() (age.Identity, error) {
+	sshKey, err := os.ReadFile(s.Private)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read SSH key: %w", err)
+	}
+
+	id, err := agessh.ParseIdentity(sshKey)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse SSH identity: %w", err)
+	}
+
+	return id, nil
+}
+
+// TODO: Should this be private?
+func (s SshKeyPair) Recipient() (age.Recipient, error) {
+	sshKey, err := os.ReadFile(s.Public)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read SSH key: %w", err)
+	}
+
+	id, err := agessh.ParseRecipient(string(sshKey))
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse SSH identity: %w", err)
+	}
+
+	return id, nil
+}