refactor: Rewrote in golang.

2025-12-29 15:47:38 -05:00 · 2025-11-03 16:19:17 -05:00
parent e38f8a4c8f
commit d6ef585a45
27 changed files with 1945 additions and 343 deletions
--- a/.envrc
+++ b/.envrc
@@ -1,3 +1 @@
 use flake
-
-export PATH="$PATH:./vendor/bin"
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,9 @@
+# dev env
 .direnv
-node_modules
-vendor
+
+# docs
+man 
+
+# build artifacts
+envr
+result
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 Have you ever wanted to back up all your .env files in case your hard drive gets
 nuked? `envr` makes it easier.

-`envr` is a [Nushell](https://www.nushell.sh) script that tracks your `.env` files
+`envr` is a binary applicate that tracks your `.env` files
 in an encyrpted sqlite database. Changes can be effortlessly synced with
 `envr sync`, and restored with `envr restore`.

--- a/app/config.go
+++ b/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
+}
--- a/app/db.go
+++ b/app/db.go
@@ -0,0 +1,376 @@
+package app
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"slices"
+
+	"filippo.io/age"
+	_ "modernc.org/sqlite"
+)
+
+// CloseMode determines whether or not the in-memory DB should be saved to disk
+// before closing the connection.
+type CloseMode int
+
+const (
+	ReadOnly CloseMode = iota
+	Write
+)
+
+type Db struct {
+	db       *sql.DB
+	cfg      Config
+	features *AvailableFeatures
+}
+
+func Open() (*Db, error) {
+	cfg, err := LoadConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err := os.Stat("/home/spencer/.envr/data.age"); err != nil {
+		// Create a new DB
+		db, err := newDb()
+		return &Db{db, *cfg, nil}, err
+	} else {
+		// Open the existing DB
+		tmpFile, err := os.CreateTemp("", "envr-*.db")
+		if err != nil {
+			return nil, fmt.Errorf("failed to create temp file: %w", err)
+		}
+		defer tmpFile.Close()
+		defer os.Remove(tmpFile.Name())
+
+		err = decryptDb(tmpFile.Name(), (*cfg).Keys)
+		if err != nil {
+			return nil, fmt.Errorf("failed to decrypt database: %w", err)
+		}
+
+		memDb, err := newDb()
+		if err != nil {
+			return nil, fmt.Errorf("failed to open temp database: %w", err)
+		}
+
+		restoreDB(tmpFile.Name(), memDb)
+
+		return &Db{memDb, *cfg, nil}, nil
+	}
+}
+
+// Creates the database for the first time
+func newDb() (*sql.DB, error) {
+	db, err := sql.Open("sqlite", ":memory:")
+
+	if err != nil {
+		return nil, err
+	} else {
+		_, err := db.Exec(`create table envr_env_files (
+      path text primary key not null
+    , dir text not null
+    , remotes text -- JSON
+    , sha256 text not null
+    , contents text not null
+  );`)
+		if err != nil {
+			return nil, err
+		} else {
+			return db, err
+		}
+	}
+}
+
+// Decrypt the database from the age file into a temp sqlite file.
+func decryptDb(tmpFilePath string, keys []SshKeyPair) error {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("failed to get user home directory: %w", err)
+	}
+
+	tmpFile, err := os.OpenFile(tmpFilePath, os.O_WRONLY, 0)
+	if err != nil {
+		return fmt.Errorf("failed to open temp file: %w", err)
+	}
+	defer tmpFile.Close()
+
+	ageFilePath := filepath.Join(homeDir, ".envr", "data.age")
+	ageFile, err := os.Open(ageFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to open age file: %w", err)
+	}
+	defer ageFile.Close()
+
+	identities := make([]age.Identity, 0, len(keys))
+
+	for _, key := range keys {
+		id, err := key.Identity()
+
+		if err != nil {
+			return err
+		}
+
+		identities = append(identities, id)
+	}
+
+	reader, err := age.Decrypt(ageFile, identities[:]...)
+	if err != nil {
+		return fmt.Errorf("failed to decrypt age file: %w", err)
+	}
+
+	_, err = io.Copy(tmpFile, reader)
+	if err != nil {
+		return fmt.Errorf("failed to copy decrypted content: %w", err)
+	}
+
+	return nil
+}
+
+// Restore the database from a file into memory
+func restoreDB(path string, destDB *sql.DB) error {
+	// Attach the source database
+	_, err := destDB.Exec("ATTACH DATABASE ? AS source", path)
+	if err != nil {
+		return fmt.Errorf("failed to attach database: %w", err)
+	}
+	defer destDB.Exec("DETACH DATABASE source")
+
+	// Copy data from source to destination
+	_, err = destDB.Exec("INSERT INTO main.envr_env_files SELECT * FROM source.envr_env_files")
+	if err != nil {
+		return fmt.Errorf("failed to copy data: %w", err)
+	}
+
+	return nil
+}
+
+// Returns all the EnvFiles present in the database.
+func (db *Db) List() (results []EnvFile, err error) {
+	rows, err := db.db.Query("select * from envr_env_files")
+
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var envFile EnvFile
+		var remotesJSON string
+
+		err := rows.Scan(&envFile.Path, &envFile.Dir, &remotesJSON, &envFile.Sha256, &envFile.contents)
+		if err != nil {
+			return nil, err
+		}
+
+		// TODO: unmarshal remotesJSON into envFile.remotes
+
+		results = append(results, envFile)
+	}
+
+	if err = rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return results, nil
+}
+
+func (db *Db) Close(mode CloseMode) error {
+	defer db.db.Close()
+
+	if mode == Write {
+		// Create tmp file
+		tmpFile, err := os.CreateTemp("", "envr-*.db")
+		if err != nil {
+			return fmt.Errorf("failed to create temp file: %w", err)
+		}
+		defer tmpFile.Close()
+		defer os.Remove(tmpFile.Name())
+
+		if err := backupDb(db.db, tmpFile.Name()); err != nil {
+			return err
+		}
+
+		if err := encryptDb(tmpFile.Name(), db.cfg.Keys); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Save the in-memory database to a tmp file.
+func backupDb(memDb *sql.DB, tmpFilePath string) error {
+	_, err := memDb.Exec("VACUUM INTO ?", tmpFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to vacuum database to file: %w", err)
+	}
+
+	return nil
+}
+
+// Encrypt the database from the temp sqlite file into an age file.
+func encryptDb(tmpFilePath string, keys []SshKeyPair) error {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("failed to get user home directory: %w", err)
+	}
+	ageFilePath := filepath.Join(homeDir, ".envr", "data.age")
+
+	// Ensure .envr directory exists
+	err = os.MkdirAll(filepath.Dir(ageFilePath), 0755)
+	if err != nil {
+		return fmt.Errorf("failed to create .envr directory: %w", err)
+	}
+
+	// Open temp file for reading
+	tmpFile, err := os.Open(tmpFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to open temp file: %w", err)
+	}
+	defer tmpFile.Close()
+
+	// Open/create age file for writing (this preserves hardlinks)
+	ageFile, err := os.OpenFile(ageFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return fmt.Errorf("failed to open age file: %w", err)
+	}
+	defer ageFile.Close()
+
+	recipients := make([]age.Recipient, 0, len(keys))
+	for _, key := range keys {
+		recipient, err := key.Recipient()
+
+		if err != nil {
+			return err
+		}
+
+		recipients = append(recipients, recipient)
+	}
+
+	writer, err := age.Encrypt(ageFile, recipients...)
+	if err != nil {
+		return fmt.Errorf("failed to create age writer: %w", err)
+	}
+
+	_, err = io.Copy(writer, tmpFile)
+	if err != nil {
+		return fmt.Errorf("failed to encrypt and write data: %w", err)
+	}
+
+	err = writer.Close()
+	if err != nil {
+		return fmt.Errorf("failed to close age writer: %w", err)
+	}
+
+	return nil
+}
+
+func (db *Db) Insert(file EnvFile) error {
+	// Marshal remotes to JSON
+	remotesJSON, err := json.Marshal(file.Remotes)
+	if err != nil {
+		return fmt.Errorf("failed to marshal remotes: %w", err)
+	}
+
+	// Insert into database
+	_, err = db.db.Exec(`
+		INSERT OR REPLACE INTO envr_env_files (path, dir, remotes, sha256, contents)
+		VALUES (?, ?, ?, ?, ?)
+	`, file.Path, file.Dir, string(remotesJSON), file.Sha256, file.contents)
+
+	if err != nil {
+		return fmt.Errorf("failed to insert env file: %w", err)
+	}
+
+	return nil
+}
+
+// Select a single EnvFile from the database.
+func (db *Db) Fetch(path string) (envFile EnvFile, err error) {
+	var remotesJSON string
+
+	row := db.db.QueryRow("SELECT path, dir, remotes, sha256, contents FROM envr_env_files WHERE path = ?", path)
+	err = row.Scan(&envFile.Path, &envFile.Dir, &remotesJSON, &envFile.Sha256, &envFile.contents)
+	if err != nil {
+		return EnvFile{}, fmt.Errorf("failed to fetch env file: %w", err)
+	}
+
+	if err = json.Unmarshal([]byte(remotesJSON), &envFile.Remotes); err != nil {
+		return EnvFile{}, fmt.Errorf("failed to unmarshal remotes: %w", err)
+	}
+
+	return envFile, nil
+}
+
+// Removes a file from the database, if present.
+func (db *Db) Delete(path string) error {
+	result, err := db.db.Exec("DELETE FROM envr_env_files WHERE path = ?", path)
+	if err != nil {
+		return fmt.Errorf("failed to delete env file: %w", err)
+	}
+
+	rowsAffected, err := result.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("failed to get rows affected: %w", err)
+	}
+
+	if rowsAffected == 0 {
+		return fmt.Errorf("no file found with path: %s", path)
+	}
+
+	return nil
+}
+
+// Finds .env files in the filesystem that aren't present in the database.
+func (db *Db) Scan() ([]string, error) {
+	all_paths, err := db.cfg.scan()
+	if err != nil {
+		return []string{}, err
+	}
+
+	untracked_paths := make([]string, 0, len(all_paths)/2)
+	env_files, err := db.List()
+
+	if err != nil {
+		return untracked_paths, err
+	}
+
+	for _, path := range all_paths {
+		backed_up := slices.ContainsFunc(env_files, func(e EnvFile) bool {
+			return e.Path == path
+		})
+
+		if backed_up {
+			continue
+		} else {
+			untracked_paths = append(untracked_paths, path)
+		}
+	}
+
+	return untracked_paths, nil
+}
+
+// Determine the available features on the installed system.
+func (db *Db) Features() AvailableFeatures {
+	if db.features == nil {
+		feats := checkFeatures()
+		db.features = &feats
+	}
+
+	return *db.features
+}
+
+// Returns nil if [Db.Scan] is safe to use, null otherwise.
+func (db *Db) CanScan() error {
+	if db.Features()&Fd == 0 {
+		return fmt.Errorf(
+			"please install fd to use the scan function (https://github.com/sharkdp/fd)",
+		)
+	} else {
+		return nil
+	}
+}
--- a/app/env_file.go
+++ b/app/env_file.go
@@ -0,0 +1,169 @@
+package app
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+type EnvFile struct {
+	Path     string
+	Dir      string
+	Remotes  []string // []string
+	Sha256   string
+	contents string
+}
+
+// The result returned by [EnvFile.Sync]
+type EnvFileSyncResult int
+
+const (
+	// The struct has been updated from the filesystem
+	// and should be updated in the database.
+	Updated EnvFileSyncResult = iota
+	// The filesystem has been restored to match the struct
+	// no further action is required.
+	Restored
+	Error
+	// The filesystem contents matches the struct
+	// no further action is required.
+	Noop
+)
+
+func NewEnvFile(path string) EnvFile {
+	// Get absolute path and directory
+	absPath, err := filepath.Abs(path)
+	if err != nil {
+		panic(fmt.Errorf("failed to get absolute path: %w", err))
+	}
+	dir := filepath.Dir(absPath)
+
+	// Get git remotes
+	remotes := getGitRemotes(dir)
+
+	// Read the file contents
+	contents, err := os.ReadFile(path)
+	if err != nil {
+		panic(fmt.Errorf("failed to read file %s: %w", path, err))
+	}
+
+	// Calculate SHA256 hash
+	hash := sha256.Sum256(contents)
+	sha256Hash := fmt.Sprintf("%x", hash)
+
+	return EnvFile{
+		Path:     absPath,
+		Dir:      dir,
+		Remotes:  remotes,
+		Sha256:   sha256Hash,
+		contents: string(contents),
+	}
+}
+
+func getGitRemotes(dir string) []string {
+	// TODO: Check for Git flag and change behaviour if unset.
+	cmd := exec.Command("git", "remote", "-v")
+	cmd.Dir = dir
+
+	output, err := cmd.Output()
+	if err != nil {
+		// Not a git repository or git command failed
+		return []string{}
+	}
+
+	lines := strings.Split(strings.TrimSpace(string(output)), "\n")
+	remoteSet := make(map[string]bool)
+
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+		parts := strings.Fields(line)
+		if len(parts) >= 2 {
+			remoteSet[parts[1]] = true
+		}
+	}
+
+	remotes := make([]string, 0, len(remoteSet))
+	for remote := range remoteSet {
+		remotes = append(remotes, remote)
+	}
+
+	return remotes
+}
+
+// Install the file into the file system
+func (file EnvFile) Restore() error {
+	// TODO: Handle restores more cleanly
+	// Ensure the directory exists
+	if err := os.MkdirAll(filepath.Dir(file.Path), 0755); err != nil {
+		return fmt.Errorf("failed to create directory: %w", err)
+	}
+
+	// Check if file already exists
+	if _, err := os.Stat(file.Path); err == nil {
+		return fmt.Errorf("file already exists: %s", file.Path)
+	}
+
+	// Write the contents to the file
+	if err := os.WriteFile(file.Path, []byte(file.contents), 0644); err != nil {
+		return fmt.Errorf("failed to write file: %w", err)
+	}
+
+	return nil
+}
+
+// Try to reconcile the EnvFile with the filesystem.
+//
+// If Updated is returned, [Db.Insert] should be called on file.
+func (file *EnvFile) Sync() (result EnvFileSyncResult, err error) {
+	// Check if the path exists in the file system
+	_, err = os.Stat(file.Path)
+	if err == nil {
+		contents, err := os.ReadFile(file.Path)
+		if err != nil {
+			return Error, fmt.Errorf("failed to read file for SHA comparison: %w", err)
+		}
+
+		// Check if sha matches by reading the current file and calculating its hash
+		hash := sha256.Sum256(contents)
+		currentSha := fmt.Sprintf("%x", hash)
+		if file.Sha256 == currentSha {
+			// Nothing to do
+			return Noop, nil
+		} else {
+			if err = file.Backup(); err != nil {
+				return Error, err
+			} else {
+				return Updated, nil
+			}
+		}
+	} else {
+		if err = file.Restore(); err != nil {
+			return Error, err
+		} else {
+			return Restored, nil
+		}
+	}
+}
+
+// Update the EnvFile using the file system
+func (file *EnvFile) Backup() error {
+	// Read the contents of the file
+	contents, err := os.ReadFile(file.Path)
+	if err != nil {
+		return fmt.Errorf("failed to read file %s: %w", file.Path, err)
+	}
+
+	// Update file.contents to match
+	file.contents = string(contents)
+
+	// Update file.sha256
+	hash := sha256.Sum256(contents)
+	file.Sha256 = fmt.Sprintf("%x", hash)
+
+	return nil
+}
--- a/app/features.go
+++ b/app/features.go
@@ -0,0 +1,32 @@
+package app
+
+import (
+	"os/exec"
+)
+
+// Represents which binaries are present in $PATH.
+// Used to fail safely when required features are unavailable
+type AvailableFeatures int
+
+const (
+	Git AvailableFeatures = 1
+	// fd
+	Fd AvailableFeatures = 2
+	// All features are present
+	All AvailableFeatures = Git & Fd
+)
+
+// Checks for available features.
+func checkFeatures() (feats AvailableFeatures) {
+	// Check for git binary
+	if _, err := exec.LookPath("git"); err == nil {
+		feats |= Git
+	}
+
+	// Check for fd binary
+	if _, err := exec.LookPath("fd"); err == nil {
+		feats |= Fd
+	}
+
+	return feats
+}
--- a/cmd/backup.go
+++ b/cmd/backup.go
@@ -0,0 +1,55 @@
+/*
+Copyright © 2025 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+// backupCmd represents the backup command
+var backupCmd = &cobra.Command{
+	Use:   "backup <path>",
+	Short: "Import a .env file into envr",
+	Args:  cobra.ExactArgs(1),
+	// Long: `Long desc`
+	RunE: func(cmd *cobra.Command, args []string) error {
+		path := args[0]
+		if len(strings.TrimSpace(path)) == 0 {
+			return fmt.Errorf("No path provided")
+		}
+
+		db, err := app.Open()
+		if err != nil {
+			return err
+		} else {
+			defer db.Close(app.Write)
+			record := app.NewEnvFile(path)
+
+			if err := db.Insert(record); err != nil {
+				panic(err)
+			} else {
+				fmt.Printf("Saved %s into the database", path)
+				return nil
+			}
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(backupCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// backupCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// backupCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
--- a/cmd/check.go
+++ b/cmd/check.go
@@ -0,0 +1,51 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/olekukonko/tablewriter"
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+var checkCmd = &cobra.Command{
+	Use:   "check",
+	Short: "Check for missing binaries",
+	Long: `envr relies on external binaries for certain functionality.
+
+The check command reports on which binaries are available and which are not.`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		db, err := app.Open()
+		if err != nil {
+			return err
+		} else {
+			defer db.Close(app.ReadOnly)
+			features := db.Features()
+
+			table := tablewriter.NewWriter(os.Stdout)
+			table.Header([]string{"Feature", "Status"})
+
+			// Check Git
+			if features&app.Git == 1 {
+				table.Append([]string{"Git", "✓ Available"})
+			} else {
+				table.Append([]string{"Git", "✗ Missing"})
+			}
+
+			// Check fd
+			if features&app.Fd == 1 {
+				table.Append([]string{"fd", "✓ Available"})
+			} else {
+				table.Append([]string{"fd", "✗ Missing"})
+			}
+
+			table.Render()
+
+			return nil
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(checkCmd)
+}
--- a/cmd/edit_config.go
+++ b/cmd/edit_config.go
@@ -0,0 +1,55 @@
+/*
+Copyright © 2025 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+)
+
+var editConfigCmd = &cobra.Command{
+	Use:   "edit-config",
+	Short: "Edit your config with your default editor",
+	// Long: ``,
+	Run: func(cmd *cobra.Command, args []string) {
+		editor := os.Getenv("EDITOR")
+		if editor == "" {
+			fmt.Println("Error: $EDITOR environment variable is not set")
+			return
+		}
+
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			fmt.Printf("Error getting home directory: %v\n", err)
+			return
+		}
+
+		configPath := filepath.Join(homeDir, ".envr", "config.json")
+
+		// Check if config file exists
+		if _, err := os.Stat(configPath); os.IsNotExist(err) {
+			fmt.Printf("Config file does not exist at %s. Run 'envr init' first.\n", configPath)
+			return
+		}
+
+		// Execute the editor
+		execCmd := exec.Command(editor, configPath)
+		execCmd.Stdin = os.Stdin
+		execCmd.Stdout = os.Stdout
+		execCmd.Stderr = os.Stderr
+
+		if err := execCmd.Run(); err != nil {
+			fmt.Printf("Error running editor: %v\n", err)
+			return
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(editConfigCmd)
+}
--- a/cmd/init.go
+++ b/cmd/init.go
@@ -0,0 +1,95 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/AlecAivazis/survey/v2"
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+// TODO: Add --force (-f) flag.
+var initCmd = &cobra.Command{
+	Use:                   "init",
+	DisableFlagsInUseLine: true,
+	Short:                 "Set up envr",
+	Long: `The init command generates your initial config and saves it to
+~/.envr/config in JSON format.
+
+During setup, you will be prompted to select one or more ssh keys with which to
+encrypt your databse. **Make 100% sure** that you have **a remote copy** of this
+key somewhere, otherwise your data could be lost forever.`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		config, _ := app.LoadConfig()
+
+		if config != nil {
+			return fmt.Errorf("You have already initialized envr")
+		} else {
+			keys, err := selectSSHKeys()
+			if err != nil {
+				return fmt.Errorf("Error selecting SSH keys: %v", err)
+			}
+
+			if len(keys) == 0 {
+				return fmt.Errorf("No SSH keys selected - Config not created")
+			}
+
+			cfg := app.NewConfig(keys)
+			if err := cfg.Save(); err != nil {
+				return err
+			}
+
+			fmt.Printf("Config initialized with %d SSH key(s). You are ready to use envr.\n", len(keys))
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(initCmd)
+}
+
+func selectSSHKeys() ([]string, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: Support reading from ssh-agent
+	sshDir := filepath.Join(homeDir, ".ssh")
+	entries, err := os.ReadDir(sshDir)
+	if err != nil {
+		return nil, fmt.Errorf("could not read ~/.ssh directory: %w", err)
+	}
+
+	var privateKeys []string
+	for _, entry := range entries {
+		name := entry.Name()
+		if !entry.IsDir() && !strings.HasSuffix(name, ".pub") &&
+			!strings.Contains(name, "known_hosts") && !strings.Contains(name, "config") {
+			privateKeys = append(privateKeys, filepath.Join(sshDir, name))
+		}
+	}
+
+	if len(privateKeys) == 0 {
+		return nil, fmt.Errorf("no SSH private keys found in ~/.ssh")
+	}
+
+	var selected []string
+
+	prompt := &survey.MultiSelect{
+		Message: "Select SSH private keys:",
+		Options: privateKeys,
+	}
+
+	err = survey.AskOne(prompt, &selected)
+	if err != nil {
+		return nil, err
+	}
+
+	return selected, nil
+}
--- a/cmd/list.go
+++ b/cmd/list.go
@@ -0,0 +1,69 @@
+package cmd
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+
+	"github.com/mattn/go-isatty"
+	"github.com/olekukonko/tablewriter"
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+type listEntry struct {
+	Directory string `json:"directory"`
+	Path      string `json:"path"`
+}
+
+var listCmd = &cobra.Command{
+	Use:   "list",
+	Short: "View your tracked files",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		db, err := app.Open()
+		if err != nil {
+			return err
+		}
+		defer db.Close(app.ReadOnly)
+
+		rows, err := db.List()
+		if err != nil {
+			return err
+		}
+
+		if isatty.IsTerminal(os.Stdout.Fd()) {
+			table := tablewriter.NewWriter(os.Stdout)
+			table.Header([]string{"Directory", "Path"})
+
+			for _, row := range rows {
+				path, err := filepath.Rel(row.Dir, row.Path)
+				if err != nil {
+					return err
+				}
+				table.Append([]string{row.Dir + "/", path})
+			}
+			table.Render()
+		} else {
+			var entries []listEntry
+			for _, row := range rows {
+				path, err := filepath.Rel(row.Dir, row.Path)
+				if err != nil {
+					return err
+				}
+				entries = append(entries, listEntry{
+					Directory: row.Dir + "/",
+					Path:      path,
+				})
+			}
+
+			encoder := json.NewEncoder(os.Stdout)
+			return encoder.Encode(entries)
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(listCmd)
+}
--- a/cmd/mod.nu
+++ b/cmd/mod.nu
@@ -0,0 +1,79 @@
+# envr command extern definitions for Nushell
+# A tool for managing environment files and backups
+
+export def tracked-paths [] {
+  (
+    ^envr list
+    | from json
+    | each {
+      [$in.directory $in.path] | path join
+    }
+  )
+}
+
+export def untracked-paths [] {
+  (
+    ^envr scan
+    | from json
+  )
+}
+
+# Complete shell types for completion command
+def shells [] {
+  ["bash", "zsh", "fish", "powershell"]
+}
+
+export extern envr [
+  ...args: any
+  --help(-h)              # Show help information
+  --toggle(-t)            # Help message for toggle
+]
+
+export extern "envr backup" [
+  --help(-h) # Show help for backup command
+  path: path@untracked-paths # Path to .env file to backup
+]
+#TODO: envr backup path.
+
+export extern "envr check" [
+  --help(-h)              # Show help for check command
+]
+
+export extern "envr completion" [
+  shell: string@shells   # Shell to generate completion for
+  --help(-h)                      # Show help for completion command
+]
+
+export extern "envr edit-config" [
+  --help(-h)              # Show help for edit-config command
+]
+
+export extern "envr help" [
+  command?: string        # Show help for specific command
+]
+
+export extern "envr init" [
+  --help(-h)              # Show help for init command
+]
+
+export extern "envr list" [
+  --help(-h)              # Show help for list command
+]
+
+export extern "envr remove" [
+  --help(-h)              # Show help for remove command
+  path: path@tracked-paths
+]
+
+export extern "envr restore" [
+  --help(-h)              # Show help for restore command
+  path: path@tracked-paths
+]
+
+export extern "envr scan" [
+  --help(-h)              # Show help for scan command
+]
+
+export extern "envr sync" [
+  --help(-h)              # Show help for sync command
+]
--- a/cmd/nushell_completion.go
+++ b/cmd/nushell_completion.go
@@ -0,0 +1,26 @@
+package cmd
+
+import (
+	_ "embed"
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+//go:embed mod.nu
+var completion string
+
+// nushellCompletionCmd represents the nushellCompletion command
+var nushellCompletionCmd = &cobra.Command{
+	Use:   "nushell-completion",
+	Short: "Generate custom completions for nushell",
+	Long: `At time of writing, cobra does not natively support nushell,
+so a custom command had to be written`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println(completion)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(nushellCompletionCmd)
+}
--- a/cmd/remove.go
+++ b/cmd/remove.go
@@ -0,0 +1,51 @@
+/*
+Copyright © 2025 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+var removeCmd = &cobra.Command{
+	Use:   "remove",
+	Short: "Remove a .env file from your database",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		path := args[0]
+		if len(strings.TrimSpace(path)) == 0 {
+			return fmt.Errorf("No path provided")
+		}
+
+		db, err := app.Open()
+		if err != nil {
+			return err
+		} else {
+			defer db.Close(app.Write)
+			if err := db.Delete(path); err != nil {
+				return err
+			} else {
+				fmt.Printf("Removed %s from the database", path)
+				return nil
+			}
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(removeCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// removeCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// removeCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
--- a/cmd/restore.go
+++ b/cmd/restore.go
@@ -0,0 +1,60 @@
+/*
+Copyright © 2025 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+// restoreCmd represents the restore command
+var restoreCmd = &cobra.Command{
+	Use:   "restore",
+	Short: "Install a .env file from the database into your file system",
+	// Long:  ``,
+	Args: cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		path := args[0]
+		if len(strings.TrimSpace(path)) == 0 {
+			return fmt.Errorf("No path provided")
+		}
+
+		db, err := app.Open()
+		if err != nil {
+			return err
+		} else {
+			defer db.Close(app.ReadOnly)
+			record, err := db.Fetch(path)
+
+			if err != nil {
+				return err
+			} else {
+				err := record.Restore()
+
+				if err != nil {
+					return err
+				} else {
+					return nil
+				}
+			}
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(restoreCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// restoreCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// restoreCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -0,0 +1,66 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "envr",
+	Short: "Manage your .env files.",
+	Long: `envr keeps your .env synced to a local, age encrypted database.
+Is a safe and eay way to gather all your .env files in one place where they can
+easily be backed by another tool such as restic or git.
+
+All your data is stored in ~/data.age
+
+Getting started is easy:
+
+1. Create your configuration file and set up encrypted storage:
+
+> envr init
+
+2. Scan for existing .env files:
+
+> envr scan
+
+Select the files you want to back up from the interactive list.
+
+3. Verify that it worked:
+
+> envr list
+
+4. After changing any of your .env files, update the backup with:
+
+> envr sync
+
+5. If you lose a repository, after re-cloning the repo into the same path it was
+at before, restore your backup with:
+
+> envr restore ~/&lt;path to repository&gt;/.env`,
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func init() {
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
+
+	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.envr.yaml)")
+
+	// Cobra also supports local flags, which will only run
+	// when this action is called directly.
+	// rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
+
+// Expose the root command for our generators.
+func Root() *cobra.Command { return rootCmd }
--- a/cmd/scan.go
+++ b/cmd/scan.go
@@ -0,0 +1,104 @@
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/AlecAivazis/survey/v2"
+	"github.com/mattn/go-isatty"
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+var scanCmd = &cobra.Command{
+	Use:   "scan",
+	Short: "Find and select .env files for backup",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		db, err := app.Open()
+		if err != nil {
+			return err
+		}
+
+		if db == nil {
+			return fmt.Errorf("No db was loaded")
+		}
+
+		if err := db.CanScan(); err != nil {
+			return err
+		}
+
+		files, err := db.Scan()
+		if err != nil {
+			return err
+		}
+
+		if len(files) == 0 {
+			return fmt.Errorf("No .env files found to add.")
+		}
+
+		if isatty.IsTerminal(os.Stdout.Fd()) {
+			selectedFiles, err := selectEnvFiles(files)
+			if err != nil {
+				return err
+			}
+
+			// Insert selected files into database
+			var addedCount int
+			for _, file := range selectedFiles {
+				envFile := app.NewEnvFile(file)
+				err := db.Insert(envFile)
+				if err != nil {
+					fmt.Printf("Error adding %s: %v\n", file, err)
+				} else {
+					addedCount++
+				}
+			}
+
+			// Close database with write mode to persist changes
+			if addedCount > 0 {
+				err = db.Close(app.Write)
+				if err != nil {
+					return fmt.Errorf("Error saving changes: %v\n", err)
+				} else {
+					fmt.Printf("Successfully added %d file(s) to backup.\n", addedCount)
+					return nil
+				}
+			} else {
+				err = db.Close(app.ReadOnly)
+				if err != nil {
+					return fmt.Errorf("Error closing database: %v\n", err)
+				}
+				fmt.Println("No files were added.")
+				return nil
+			}
+		} else {
+			output, err := json.Marshal(files)
+			if err != nil {
+				return fmt.Errorf("Error marshaling files to JSON: %v", err)
+			}
+			fmt.Println(string(output))
+			return nil
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(scanCmd)
+}
+
+func selectEnvFiles(files []string) ([]string, error) {
+	var selectedFiles []string
+
+	prompt := &survey.MultiSelect{
+		Message: "Select .env files to backup:",
+		Options: files,
+	}
+
+	err := survey.AskOne(prompt, &selectedFiles)
+	if err != nil {
+		return nil, err
+	}
+
+	return selectedFiles, nil
+}
--- a/cmd/sync.go
+++ b/cmd/sync.go
@@ -0,0 +1,62 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+// TODO: Detect when file paths have moved and update accordingly.
+var syncCmd = &cobra.Command{
+	Use:   "sync",
+	Short: "Update or restore your env backups",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		db, err := app.Open()
+		if err != nil {
+			return err
+		} else {
+			defer db.Close(app.Write)
+			files, err := db.List()
+
+			if err != nil {
+				return err
+			} else {
+				for _, file := range files {
+					fmt.Printf("%s\n", file.Path)
+
+					// Syncronize the filesystem with the database.
+					changed, err := file.Sync()
+
+					switch changed {
+					case app.Updated:
+						fmt.Printf("File updated - changes saved\n")
+						if err := db.Insert(file); err != nil {
+							return err
+						}
+					case app.Restored:
+						fmt.Printf("File missing - restored backup\n")
+					case app.Error:
+						if err == nil {
+							panic("err cannot be nil when Sync returns Error")
+						} else {
+							fmt.Printf("%s\n", err)
+						}
+					case app.Noop:
+						fmt.Println("Nothing to do")
+					default:
+						panic("Unknown result")
+					}
+
+					fmt.Println("")
+				}
+
+				return nil
+			}
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(syncCmd)
+}
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -0,0 +1,35 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+)
+
+var long bool
+
+// versionCmd represents the version command
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Show envr's version",
+	Run: func(cmd *cobra.Command, args []string) {
+		if long {
+			fmt.Printf("envr version %s\n", version)
+			fmt.Printf("commit: %s\n", commit)
+			fmt.Printf("built: %s\n", date)
+		} else {
+			fmt.Printf("%s\n", version)
+		}
+	},
+}
+
+func init() {
+	versionCmd.Flags().BoolVarP(&long, "long", "l", false, "Show all version information")
+	rootCmd.AddCommand(versionCmd)
+}
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
        "nixpkgs-lib": "nixpkgs-lib"
      },
      "locked": {
-        "lastModified": 1760948891,
-        "narHash": "sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4=",
+        "lastModified": 1751413152,
+        "narHash": "sha256-Tyw1RjYEsp5scoigs1384gIg6e0GoBVjms4aXFfRssQ=",
        "owner": "hercules-ci",
        "repo": "flake-parts",
-        "rev": "864599284fc7c0ba6357ed89ed5e2cd5040f0c04",
+        "rev": "77826244401ea9de6e3bac47c2db46005e1f30b5",
        "type": "github"
      },
      "original": {
@@ -20,25 +20,27 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1761594641,
-        "narHash": "sha256-sImk6SJQASDLQo8l+0zWWaBgg7TueLS6lTvdH5pBZpo=",
+        "lastModified": 1761597516,
+        "narHash": "sha256-wxX7u6D2rpkJLWkZ2E932SIvDJW8+ON/0Yy8+a5vsDU=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "1666250dbe4141e4ca8aaf89b40a3a51c2e36144",
+        "rev": "daf6dc47aa4b44791372d6139ab7b25269184d55",
        "type": "github"
      },
      "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "nixpkgs-lib": {
      "locked": {
-        "lastModified": 1754788789,
-        "narHash": "sha256-x2rJ+Ovzq0sCMpgfgGaaqgBSwY+LST+WbZ6TytnT9Rk=",
+        "lastModified": 1751159883,
+        "narHash": "sha256-urW/Ylk9FIfvXfliA1ywh75yszAbiTEVgpPeinFyVZo=",
        "owner": "nix-community",
        "repo": "nixpkgs.lib",
-        "rev": "a73b9c743612e4244d865a2fdee11865283c04e6",
+        "rev": "14a40a1d7fb9afa4739275ac642ed7301a9ba1ab",
        "type": "github"
      },
      "original": {
@@ -49,11 +51,11 @@
    },
    "nixpkgs-unstable": {
      "locked": {
-        "lastModified": 1761594641,
-        "narHash": "sha256-sImk6SJQASDLQo8l+0zWWaBgg7TueLS6lTvdH5pBZpo=",
+        "lastModified": 1751949589,
+        "narHash": "sha256-mgFxAPLWw0Kq+C8P3dRrZrOYEQXOtKuYVlo9xvPntt8=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "1666250dbe4141e4ca8aaf89b40a3a51c2e36144",
+        "rev": "9b008d60392981ad674e04016d25619281550a9d",
        "type": "github"
      },
      "original": {
@@ -67,7 +69,28 @@
      "inputs": {
        "flake-parts": "flake-parts",
        "nixpkgs": "nixpkgs",
-        "nixpkgs-unstable": "nixpkgs-unstable"
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1752055615,
+        "narHash": "sha256-19m7P4O/Aw/6+CzncWMAJu89JaKeMh3aMle1CNQSIwM=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "c9d477b5d5bd7f26adddd3f96cfd6a904768d4f9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
      }
    }
  },
--- a/flake.nix
+++ b/flake.nix
@@ -2,19 +2,25 @@
  description = "Manage your .env files.";

  inputs = {
-    # nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

    flake-parts.url = "github:hercules-ci/flake-parts";
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs =
-    inputs@{ self
-    , flake-parts
+    inputs@{ flake-parts
    , nixpkgs
    , nixpkgs-unstable
+    , self
+    , treefmt-nix
    }:
    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        inputs.treefmt-nix.flakeModule
+      ];
      systems = [ "x86_64-linux" ];

      perSystem =
@@ -24,17 +30,67 @@
            config.allowUnfree = true;

            overlays = [
-              (final: prev: { unstable = inputs'.nixpkgs-unstable.legacyPackages; })
+              (_final: _prev: { unstable = inputs'.nixpkgs-unstable.legacyPackages; })
            ];
          };

+          treefmt = {
+            # Used to find the project root
+            projectRootFile = "flake.nix";
+            settings.global.excludes = [
+              ".direnv/**"
+              ".jj/**"
+              ".env"
+              ".envrc"
+              ".env.local"
+            ];
+
+
+            # Format nix files
+            programs.nixpkgs-fmt.enable = true;
+            # programs.deadnix.enable = true;
+
+            # Format go files
+            programs.goimports.enable = true;
+          };
+
+          packages.default = pkgs.buildGoModule rec {
+            pname = "envr";
+            version = "0.1.0";
+            src = ./.;
+            # If the build complains, uncomment this line
+            # vendorHash = "sha256:0000000000000000000000000000000000000000000000000000";
+            vendorHash = "sha256-aC82an6vYifewx4amfXLzk639jz9fF5bD5cF6krY0Ks=";
+            
+            nativeBuildInputs = [ pkgs.installShellFiles ];
+
+            ldflags = [
+              "-X github.com/sbrow/envr/cmd.version=v${version}"
+              # "-X github.com/sbrow/envr/cmd.commit=$(git rev-parse HEAD)"
+              # "-X github.com/sbrow/envr/cmd.date=$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+            ];
+            
+            postBuild = ''
+              # Generate man pages
+              $GOPATH/bin/docgen -out ./man -format man
+            '';
+            
+            postInstall = ''
+              # Install man pages
+              installManPage ./man/*.1
+            '';
+          };
+
          devShells.default = pkgs.mkShell
            {
              buildInputs = with pkgs; [
-                age
                fd
                nushell
-                sqlite
+                go
+                gopls
+
+                gotools
+                cobra-cli

                # IDE
                unstable.helix
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,41 @@
+module github.com/sbrow/envr
+
+go 1.24.6
+
+require (
+	filippo.io/age v1.2.1
+	github.com/AlecAivazis/survey/v2 v2.3.7
+	github.com/mattn/go-isatty v0.0.20
+	github.com/olekukonko/tablewriter v1.1.0
+	github.com/spf13/cobra v1.10.1
+	modernc.org/sqlite v1.39.1
+)
+
+require (
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.6 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/fatih/color v1.15.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d // indirect
+	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/olekukonko/errors v1.1.0 // indirect
+	github.com/olekukonko/ll v0.0.9 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	golang.org/x/crypto v0.24.0 // indirect
+	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
+	golang.org/x/sys v0.37.0 // indirect
+	golang.org/x/term v0.36.0 // indirect
+	golang.org/x/text v0.30.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	modernc.org/libc v1.66.10 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
+)
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,138 @@
+c2sp.org/CCTV/age v0.0.0-20240306222714-3ec4d716e805 h1:u2qwJeEvnypw+OCPUHmoZE3IqwfuN5kgDfo5MLzpNM0=
+c2sp.org/CCTV/age v0.0.0-20240306222714-3ec4d716e805/go.mod h1:FomMrUJ2Lxt5jCLmZkG3FHa72zUprnhd3v/Z18Snm4w=
+filippo.io/age v1.2.1 h1:X0TZjehAZylOIj4DubWYU1vWQxv9bJpo+Uu2/LGhi1o=
+filippo.io/age v1.2.1/go.mod h1:JL9ew2lTN+Pyft4RiNGguFfOpewKwSHm5ayKD/A4004=
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/AlecAivazis/survey/v2 v2.3.7 h1:6I/u8FvytdGsgonrYsVn2t8t4QiRnh6QSTqkkhIiSjQ=
+github.com/AlecAivazis/survey/v2 v2.3.7/go.mod h1:xUTIdE4KCOIjsBAE1JYsUPoCqYdZ1reCfTwbto0Fduo=
+github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2 h1:+vx7roKuyA63nhn5WAunQHLTznkw5W8b1Xc0dNjp83s=
+github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2/go.mod h1:HBCaDeC1lPdgDeDbhX8XFpy1jqjK0IBG8W5K+xYqA0w=
+github.com/cpuguy83/go-md2man/v2 v2.0.6 h1:XJtiaUW6dEEqVuZiMTn1ldk455QWwEIsMIJlo5vtkx0=
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
+github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
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+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
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+github.com/mattn/go-colorable v0.1.14/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
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--- a/internal/tools/docgen/main.go
+++ b/internal/tools/docgen/main.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/sbrow/envr/cmd" // update to your module path
+	"github.com/spf13/cobra/doc"
+)
+
+func main() {
+	out := flag.String("out", "./docs/cli", "output directory")
+	format := flag.String("format", "markdown", "markdown|man|rest")
+	front := flag.Bool("frontmatter", false, "prepend simple YAML front matter to markdown")
+	flag.Parse()
+
+	if err := os.MkdirAll(*out, 0o755); err != nil {
+		log.Fatal(err)
+	}
+
+	root := cmd.Root()
+	root.DisableAutoGenTag = true // stable, reproducible files (no timestamp footer)
+
+	switch *format {
+	case "markdown":
+		if *front {
+			prep := func(filename string) string {
+				base := filepath.Base(filename)
+				name := strings.TrimSuffix(base, filepath.Ext(base))
+				title := strings.ReplaceAll(name, "_", " ")
+				return fmt.Sprintf("---\ntitle: %q\nslug: %q\ndescription: \"CLI reference for %s\"\n---\n\n", title, name, title)
+			}
+			link := func(name string) string { return strings.ToLower(name) }
+			if err := doc.GenMarkdownTreeCustom(root, *out, prep, link); err != nil {
+				log.Fatal(err)
+			}
+		} else {
+			if err := doc.GenMarkdownTree(root, *out); err != nil {
+				log.Fatal(err)
+			}
+		}
+	case "man":
+		hdr := &doc.GenManHeader{Title: strings.ToUpper(root.Name()), Section: "1"}
+		if err := doc.GenManTree(root, hdr, *out); err != nil {
+			log.Fatal(err)
+		}
+	case "rest":
+		if err := doc.GenReSTTree(root, *out); err != nil {
+			log.Fatal(err)
+		}
+	default:
+		log.Fatalf("unknown format: %s", *format)
+	}
+}
--- a/main.go
+++ b/main.go
@@ -0,0 +1,7 @@
+package main
+
+import "github.com/sbrow/envr/cmd"
+
+func main() {
+	cmd.Execute()
+}
--- a/mod.nu
+++ b/mod.nu
@@ -1,317 +0,0 @@
-#!/usr/bin/env nu
-#
-# TODO: Wrap blocks that use tmp files in try so we can clean them up.
-
-use std assert;
-
-# Manage your .env files with ease
-@example "Set up envr" { envr init }
-export def envr [] {
-  help envr
-}
-
-# Import a .env file into envr
-export def "envr backup" [
-  file: path
-] {
-  cd (dirname $file);
-
-  let contents = (open $file --raw)
-
-  open db
-
-  let row = {
-    path: $file
-    dir: (pwd)
-    remotes: (git remote | lines | each { git remote get-url $in } | to json)
-    sha256: ($contents | hash sha256)
-    contents: $contents
-  };
-
-  try {
-    $row | stor insert -t envr_env_files
-  } catch {
-    $row | stor update -t envr_env_files -w $'path == "($row.path)"'
-  }
-
-  close db
-
-  $"file '($file)' backed up!"
-}
-
-const db_path = '~/.envr/data.age'
-
-# Create or load the database
-def "open db" [] {
-  if (not ($db_path | path exists)) {
-    create-db
-  } else {
-    # Open the db
-    let dec = mktemp -p ~/.envr;
-    let priv_key = ((envr config show).keys.0.private | path expand);
-    age -d -i $priv_key ($db_path | path expand) | save -f $dec
-    stor import -f $dec
-    rm $dec
-  }
-
-  stor open
-}
-
-def "create-db" []: nothing -> any {
-  let dec = mktemp -p ~/.envr;
-
-  sqlite3 $dec 'create table envr_env_files (
-      path text primary key not null
-    , dir text not null
-    , remotes text -- JSON
-    , sha256 text not null
-    , contents text not null
-  );'
-
-  let pub_key = ((envr config show).keys.0.public | path expand);
-  age -R $pub_key $dec | save -f $db_path
-
-  stor import -f $dec
-  rm $dec;
-}
-
-def "close db" [] {
-  let dec = mktemp -p ~/.envr;
-
-  stor export --file-name $dec;
-
-  # Encrypt the file
-  let pub_key = ((envr config show).keys.0.public | path expand);
-  age -R $pub_key $dec | save -f $db_path
-
-  rm $dec
-}
-
-# Restore a .env file from backup
-export def "envr restore" [
-  path?: path # The path of the file to restore. Will be prompted if left blank.
-]: nothing -> string {
-  let files = (files)
-  let $path = if ($path | is-empty) {
-    (
-      $files
-      | select path dir remotes
-      | input list -f "Please select a file to restore"
-      | get path
-    )
-  } else {
-    $path
-  }
-
-  let file = ($files | where path == $path | first);
-  assert ($file | is-not-empty) "File must be found"
-
-  let response = if (($path | path type) == 'file') {
-    if (open --raw $file.path | hash sha256 | $in == $file.sha256) {
-      # File matches
-      $'(ansi yellow)file is already up to date.(ansi reset)';
-    } else {
-      # File exists, but doesn't match
-      let continue = (
-        [No Yes]
-        | input list $"File '($path)' already exists, are you sure you want to overwrite it?"
-        | $in == 'Yes'
-      );
-
-      if ($continue) {
-        null
-      } else {
-        $'(ansi yellow)No action was taken(ansi reset)'
-      }
-    }
-  };
-
-  if ($response | is-empty) {
-    # File should be restored
-    $file.contents | save -f $path
-    return $'(ansi green)($path) restored!(ansi reset)'
-  } else {
-    return $response
-  }
-}
-
-# Supported config formats
-const available_formats = [
-  json
-  toml
-  yaml
-  ini
-  xml
-  nuon
-]
-
-# Create your initial config
-export def "envr init" [
-  format?: string
-  #identity?: path
-]: nothing -> record {
-  mkdir ~/.envr
-
-  if (glob ~/.envr/config.* | length | $in > 0) {
-    error make {
-      msg: "A config file already exists"
-      label: {
-        text: ""
-        span: (metadata $format).span
-      }
-    }
-  } else {
-    let format = if ($format | is-empty) {
-      $available_formats | input list 'Please select the desired format for your config file'
-    }
-
-    # TODO: Let user select identity.
-    let identity = '~/.ssh/id_ed25519';
-  
-    # The path to the config file.
-    let source = $'~/.envr/config.($format)'
-
-    # TODO: Let user select file types to scan for.
-
-    {
-      source: $source
-      priv_key: $identity
-      pub_key: $'($identity).pub'
-      scan: {
-        matcher: '\.env'
-        exclude: '*.envrc'
-        include: '~'
-      }
-    } | tee {
-      save $source;
-      open db
-    }
-  }
-}
-
-# Remove a .env file from your backups.
-export def "envr remove" [
-  ...paths: path
-] {
-  let $paths = if ($paths | is-empty) {
-    (envr list | get path) | input list -m "Select path(s) to remove"
-  } else {
-    $paths
-  };
-
-  print -e $paths;
-
-  let confirmed = (
-    ['No' 'Yes']
-    | input list 'Are you sure you want to delete these backups?'
-    | $in == 'Yes'
-  );
-
-  if ($confirmed) {
-    let $q = (
-      $paths
-      | each { path expand }
-      | to json -r
-      | str replace '[' '('
-      | str replace ']' ')'
-      | str replace -a '"' "'");
-    (
-      open db
-      | stor delete -t envr_env_files -w $'path in ($q)'
-    );
-
-    close db
-
-    $'(ansi green)Paths removed!'
-  } else {
-    $'(ansi yellow)Operation aborted.(ansi reset)'
-  }
-}
-
-# View your tracked files
-export def "envr list" [] {
-  (
-    files
-    | reject contents
-    | update path { $in | path relative-to ~/ | $'~/($in)' }
-    | update dir { $in | path relative-to ~/ | $'~/($in)' }
-  )
-}
-
-# List all the files in the database
-def files [] {
-  (
-    open db
-    | query db 'select * from envr_env_files'
-    | update remotes { from json }
-  )
-}
-
-# Update or restore your env backups
-export def "envr sync" [] {
-  let $files = (files);
-
-  $files | each { |it|
-    if ($it.path | path type | $in == 'file') {
-      if (open $it.path | hash sha256 | $in != $it.sha256) {
-        envr backup $it.path
-      } else {
-        'Nothing to do!'
-      }
-    } else {
-      envr restore $it.path
-    }
-  }
-}
-
-# Search for .env files and select ones to back up.
-export def "envr scan" [] {
-  let config = (envr config show).scan;
-
-  let ignored_env_files = (
-    find env-files $config.matcher $config.exclude $config.include
-  );
-
-  let tracked_file_paths = (files).path;
-
-  let scanned = $ignored_env_files | where { |it|
-    not ($it in $tracked_file_paths)
-  }
-
-  (
-    $scanned
-    | input list -m "Select files to back up"
-    | each { envr backup $in }
-  )
-}
-
-# Search for hidden env files 
-def "find env-files" [
-  match: string = '\.env'
-  exclude: string = '*.envrc'
-  search: string = '~/'
-]: nothing -> list<path> {
-  let search = ($search | path expand);
-
-  let unignored = (fd -a $match -E $exclude -H $search | lines)
-  let all = (fd -a $match -E $exclude -HI $search | lines)
-  let ignored = $all | where { |it|
-    not ($it in $unignored)
-  }
-
-  $ignored | sort
-}
-
-# Edit your config
-export def "envr edit config" [] {
-  ^$env.EDITOR (config-file)
-}
-
-def "config-file" []: [nothing -> path nothing -> nothing] {
-  ls ~/.envr/config.* | get 0.name -o
-}
-
-# show your current config
-def "envr config show" []: nothing -> record<source: path, priv_key: path, pub_key: path> {
-  open (config-file)
-}