update go deps

.gitignore

@@ -1 +1,2 @@
 cmd/mg/mg
+.crush

AGENTS.md

@@ -0,0 +1,234 @@
+# AGENTS.md
+
+Agent guide for the `mg` codebase - a Go replacement for [myrepos](https://myrepos.branchable.com/) that only supports git repos.
+
+## Project Overview
+
+`mg` is a CLI tool for managing multiple git repositories simultaneously. It uses `go-git/go-git` for pure Go git operations (no external git dependency required) and `spf13/cobra` for CLI structure.
+
+### Key Features
+
+- Parallel operations via `-j` flag
+- Compatible with existing `~/.mrconfig` files (auto-migrates to `mgconfig`)
+- Pure Go implementation - no external git binary needed
+- Embeddable as a library
+
+## Commands
+
+```bash
+# Build
+go build ./...
+
+# Run tests
+go test ./...
+
+# Install the binary
+go install ./cmd/mg
+
+# Run directly
+go run ./cmd/mg <command>
+```
+
+## Project Structure
+
+```
+mg/
+├── cmd/
+│   ├── mg/
+│   │   ├── main.go          # Entry point
+│   │   └── cmd/             # Cobra commands
+│   │       ├── root.go      # Root command setup
+│   │       ├── common.go    # Shared utilities (GetConfig)
+│   │       ├── clone.go     # Clone all repos (implemented)
+│   │       ├── pull.go      # Pull all repos (implemented)
+│   │       ├── register.go  # Register repo (implemented)
+│   │       ├── unregister.go# Unregister repo (implemented)
+│   │       ├── import.go    # Merge configs (implemented)
+│   │       ├── push.go      # Stub
+│   │       ├── fetch.go     # Stub
+│   │       ├── status.go    # Stub
+│   │       ├── diff.go      # Stub
+│   │       ├── commit.go    # Stub
+│   │       └── config.go    # Stub
+│   └── paths/
+│       └── mrpaths.go       # Utility to list repo paths from mrconfig
+└── parse/
+    ├── mgconf.go            # MGConfig: JSON-based config format
+    ├── myrepos.go           # MRConfig: Parse ~/.mrconfig (INI-style)
+    └── myrepos_test.go      # Tests (skeleton)
+```
+
+## Implementation Status
+
+| Command      | Status      | Notes                              |
+|--------------|-------------|------------------------------------|
+| `clone`      | Implemented | Parallel via `-j`, creates dirs   |
+| `pull`       | Implemented | Parallel via `-j`                  |
+| `register`   | Implemented | Detects git root, stores `$HOME`  |
+| `unregister` | Implemented | By path or current dir             |
+| `import`     | Implemented | Merge configs, supports stdin `-` |
+| `push`       | Stub        | Prints "push called"               |
+| `fetch`      | Stub        | Prints "fetch called"              |
+| `status`     | Stub        | Prints "status called"             |
+| `diff`       | Stub        | Prints "diff called"               |
+| `commit`     | Stub        | Prints "commit called"             |
+| `config`     | Stub        | Prints "config called"             |
+
+## Configuration
+
+### Config File Location
+
+1. `$MGCONFIG` environment variable (if set)
+2. `$XDG_CONFIG_HOME/mgconfig`
+3. `~/.config/mgconfig`
+
+### Config Format (JSON)
+
+```json
+{
+  "Repos": [
+    {
+      "Path": "$HOME/code/project",
+      "Remote": "git@github.com:user/project.git"
+    }
+  ],
+  "Aliases": {}
+}
+```
+
+### Migration from myrepos
+
+If no `mgconfig` exists but `~/.mrconfig` does, `mg` auto-migrates on first run. The `MRConfig.ToMGConfig()` method handles conversion.
+
+## Code Patterns
+
+### Adding a New Command
+
+1. Create `cmd/mg/cmd/<name>.go`
+2. Define a `cobra.Command` variable
+3. Register in `init()` via `rootCmd.AddCommand()`
+4. For parallel operations, follow the pattern in `clone.go` or `pull.go`:
+
+```go
+var myCmd = &cobra.Command{
+    Use:   "mycommand",
+    Short: "description",
+    Run: func(_ *cobra.Command, args []string) {
+        conf := GetConfig()  // Load config with fallback to mrconfig
+        // Implementation...
+    },
+}
+
+func init() {
+    rootCmd.AddCommand(myCmd)
+    myCmd.Flags().IntVarP(&jobs, "jobs", "j", 1, "number of parallel jobs")
+}
+```
+
+### Parallel Execution Pattern
+
+Used in `clone.go` and `pull.go`:
+
+```go
+repoChan := make(chan RepoType, len(repos))
+wg := sync.WaitGroup{}
+mutex := sync.Mutex{}
+errs := []Error{}
+
+wg.Add(len(repos))
+for i := 0; i < jobs; i++ {
+    go func() {
+        for repo := range repoChan {
+            // Do work
+            // Use mutex for shared state (errs, counters)
+            wg.Done()
+        }
+    }()
+}
+
+for _, repo := range repos {
+    repoChan <- repo
+}
+close(repoChan)
+wg.Wait()
+```
+
+### Git Operations
+
+Use `go-git/go-git/v5`:
+
+```go
+import git "github.com/go-git/go-git/v5"
+
+// Open repo (detects .git in parent dirs)
+r, err := git.PlainOpenWithOptions(path, &git.PlainOpenOptions{DetectDotGit: true})
+
+// Clone
+_, err = git.PlainClone(path, false, &git.CloneOptions{URL: remote})
+
+// Pull
+w, _ := r.Worktree()
+err = w.Pull(&git.PullOptions{})
+// Check: err == git.NoErrAlreadyUpToDate
+```
+
+### Path Handling
+
+- Paths in config use `$HOME` prefix for portability
+- `GetConfig()` in `common.go` expands `$HOME` to actual home directory at runtime
+- `register` command stores paths with `$HOME` prefix
+
+## Key Types
+
+### `parse.MGConfig`
+
+```go
+type MGConfig struct {
+    Repos   []Repo
+    Aliases map[string]string
+}
+
+// Methods
+func LoadMGConfig() (MGConfig, error)
+func (m *MGConfig) AddRepo(path, remote string) error
+func (m *MGConfig) DelRepo(path string) error
+func (m *MGConfig) Merge(m2 MGConfig) (Stats, error)
+func (m MGConfig) Save() error
+```
+
+### `parse.Repo`
+
+```go
+type Repo struct {
+    Path    string
+    Remote  string
+    Aliases map[string]string `json:"aliases,omitempty"`
+}
+```
+
+## Dependencies
+
+- `github.com/go-git/go-git/v5` - Pure Go git implementation
+- `github.com/spf13/cobra` - CLI framework
+
+## Testing
+
+Tests are minimal. Only `parse/myrepos_test.go` exists with a skeleton structure:
+
+```bash
+go test ./...
+```
+
+## Known Issues / TODOs
+
+1. Several commands are stubs (push, fetch, status, diff, commit, config)
+2. `parse/mgconf.go:61` has a hint about inefficient string concatenation in a loop
+3. Test coverage is minimal
+4. `unregister` command short description incorrectly says "add current path" (copy-paste error)
+
+## Error Handling Pattern
+
+Commands typically:
+1. Log errors via `log.Println(err)`
+2. Exit with `os.Exit(1)` on fatal errors
+3. Collect errors during parallel operations and report summary at end

cmd/mg/.gitignore

@@ -0,0 +1 @@
+main

cmd/mg/cmd/clone.go

@@ -0,0 +1,106 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"sync"
+
+	git "github.com/go-git/go-git/v5"
+	"github.com/spf13/cobra"
+
+	"github.com/taigrr/mg/parse"
+)
+
+// cloneCmd represents the clone command
+var (
+	cloneCmd = &cobra.Command{
+		Use:   "clone",
+		Short: "ensure all repos defined in the config are cloned",
+		Run: func(_ *cobra.Command, args []string) {
+			type RepoError struct {
+				Error error
+				Repo  string
+			}
+			if jobs < 1 {
+				log.Println("jobs must be greater than 0")
+				os.Exit(1)
+			}
+			conf := GetConfig()
+			if len(args) > 0 {
+				log.Println("too many arguments")
+				os.Exit(1)
+			}
+			repoChan := make(chan parse.Repo, len(conf.Repos))
+			errs := []RepoError{}
+			alreadyCloned := 0
+			mutex := sync.Mutex{}
+			wg := sync.WaitGroup{}
+			wg.Add(len(conf.Repos))
+			cloneFunc := func() {
+				for repo := range repoChan {
+					_, err := git.PlainOpenWithOptions(repo.Path, &(git.PlainOpenOptions{DetectDotGit: true}))
+					if err == nil {
+						log.Printf("already cloned: %s\n", repo.Path)
+						mutex.Lock()
+						alreadyCloned++
+						mutex.Unlock()
+						wg.Done()
+						continue
+					} else if err == git.ErrRepositoryNotExists {
+						log.Printf("attempting clone: %s\n", repo.Path)
+						parentPath := filepath.Dir(repo.Path)
+						if _, err := os.Stat(parentPath); err != nil {
+							os.MkdirAll(parentPath, os.ModeDir|os.ModePerm)
+						}
+						_, err = git.PlainClone(repo.Path, false, &git.CloneOptions{
+							URL: repo.Remote,
+						})
+						if err != nil {
+							mutex.Lock()
+							errs = append(errs, RepoError{Error: err, Repo: repo.Path})
+							mutex.Unlock()
+							log.Printf("clone failed for %s: %v\n", repo.Path, err)
+							wg.Done()
+							continue
+						}
+						fmt.Printf("successfully cloned %s\n", repo.Path)
+						wg.Done()
+						continue
+					} else {
+						mutex.Lock()
+						errs = append(errs, RepoError{Error: err, Repo: repo.Path})
+						mutex.Unlock()
+						log.Printf("clone failed for %s: %v\n", repo.Path, err)
+						wg.Done()
+						continue
+					}
+				}
+			}
+			for i := 0; i < jobs; i++ {
+				go cloneFunc()
+			}
+			fmt.Println(len(conf.Repos))
+			for _, repo := range conf.Repos {
+				repoChan <- repo
+			}
+			close(repoChan)
+			fmt.Println("waiting...")
+			wg.Wait()
+			for _, err := range errs {
+				log.Printf("error pulling %s: %s\n", err.Repo, err.Error)
+			}
+			lenErrs := len(errs)
+			fmt.Println()
+			fmt.Printf("successfully cloned %d/%d repos\n", len(conf.Repos)-lenErrs, len(conf.Repos))
+			fmt.Printf("%d repos already cloned\n", alreadyCloned)
+			fmt.Printf("failed to clone %d/%d repos\n", lenErrs, len(conf.Repos))
+		},
+	}
+)
+
+func init() {
+	rootCmd.AddCommand(cloneCmd)
+	cloneCmd.Flags().IntVarP(&jobs, "jobs", "j", 1, "number of jobs to run in parallel")
+}

cmd/mg/cmd/commit.go

@@ -10,7 +10,7 @@ import (
 var commitCmd = &cobra.Command{
 	Use:   "commit",
 	Short: "commit all current repos with the same message",
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, args []string) {
 		fmt.Println("commit called")
 	},
 }

cmd/mg/cmd/common.go

@@ -27,5 +27,6 @@ func GetConfig() parse.MGConfig {
 			}
 		}
 	}
+	conf.ExpandPaths()
 	return conf
 }

cmd/mg/cmd/import.go

@@ -0,0 +1,64 @@
+package cmd
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/taigrr/mg/parse"
+)
+
+var importCmd = &cobra.Command{
+	Use:   "import <file>",
+	Short: "merge a new mgconfig into the current one",
+	Args:  cobra.ExactArgs(1),
+	Run: func(_ *cobra.Command, args []string) {
+		conf := GetConfig()
+		if args[0] == "-" {
+			f, err := io.ReadAll(os.Stdin)
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			parsed, err := parse.ParseMGConfig(f)
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			stats, err := conf.Merge(parsed)
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			fmt.Println(stats)
+		} else {
+			f, err := os.ReadFile(args[0])
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			parsed, err := parse.ParseMGConfig(f)
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			stats, err := conf.Merge(parsed)
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			fmt.Println(stats)
+		}
+		err := conf.Save()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(importCmd)
+}

cmd/mg/cmd/pull.go

@@ -15,7 +15,7 @@ var (
 	jobs    int
 	pullCmd = &cobra.Command{
 		Use:   "pull",
-		Short: "add current path to list of repos",
+		Short: "update all git repos specified in config",
 		Run: func(_ *cobra.Command, args []string) {
 			type RepoError struct {
 				Error error

cmd/mg/cmd/register.go

@@ -52,6 +52,7 @@ var registerCmd = &cobra.Command{
 			os.Exit(1)
 		}
 		path = newPath.Filesystem.Root()
+
 		for _, v := range conf.Repos {
 			if v.Path == path {
 				fmt.Printf("repo %s already registered\n", path)

cmd/mg/cmd/root.go

@@ -2,14 +2,44 @@ package cmd
 
 import (
 	"os"
+	"runtime/debug"
 
 	"github.com/spf13/cobra"
 )
 
+func getVersion() string {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "dev"
+	}
+	if info.Main.Version != "" && info.Main.Version != "(devel)" {
+		return info.Main.Version
+	}
+	var revision, dirty string
+	for _, s := range info.Settings {
+		switch s.Key {
+		case "vcs.revision":
+			revision = s.Value
+		case "vcs.modified":
+			if s.Value == "true" {
+				dirty = "-dirty"
+			}
+		}
+	}
+	if revision != "" {
+		if len(revision) > 7 {
+			revision = revision[:7]
+		}
+		return revision + dirty
+	}
+	return "dev"
+}
+
 // rootCmd represents the base command when called without any subcommands
 var rootCmd = &cobra.Command{
-	Use:   "mg",
-	Short: "go replacement for myrepos which only supports git repos",
+	Use:     "mg",
+	Short:   "go replacement for myrepos which only supports git repos",
+	Version: getVersion(),
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.

go.mod

@@ -1,35 +1,35 @@
 module github.com/taigrr/mg
 
-go 1.20
+go 1.25.5
 
 require (
-	github.com/go-git/go-git/v5 v5.8.1
-	github.com/spf13/cobra v1.7.0
+	github.com/go-git/go-git/v5 v5.16.4
+	github.com/spf13/cobra v1.10.2
 )
 
 require (
-	dario.cat/mergo v1.0.0 // indirect
-	github.com/Microsoft/go-winio v0.6.1 // indirect
-	github.com/ProtonMail/go-crypto v0.0.0-20230717121422-5aa5874ade95 // indirect
-	github.com/acomagu/bufpipe v1.0.4 // indirect
-	github.com/cloudflare/circl v1.3.3 // indirect
+	dario.cat/mergo v1.0.2 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.3.0 // indirect
+	github.com/cloudflare/circl v1.6.2 // indirect
+	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
-	github.com/go-git/go-billy/v5 v5.4.1 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/imdario/mergo v0.3.16 // indirect
+	github.com/go-git/go-billy/v5 v5.7.0 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
-	github.com/kevinburke/ssh_config v1.2.0 // indirect
-	github.com/pjbgf/sha1cd v0.3.0 // indirect
-	github.com/sergi/go-diff v1.3.1 // indirect
-	github.com/skeema/knownhosts v1.2.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/kevinburke/ssh_config v1.4.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/pjbgf/sha1cd v0.5.0 // indirect
+	github.com/sergi/go-diff v1.4.0 // indirect
+	github.com/skeema/knownhosts v1.3.2 // indirect
+	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/xanzy/ssh-agent v0.3.3 // indirect
-	golang.org/x/crypto v0.12.0 // indirect
-	golang.org/x/mod v0.12.0 // indirect
-	golang.org/x/net v0.14.0 // indirect
-	golang.org/x/sys v0.11.0 // indirect
-	golang.org/x/tools v0.12.0 // indirect
+	golang.org/x/crypto v0.47.0 // indirect
+	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 )

go.sum

@@ -1,92 +1,132 @@
 dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
 dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+dario.cat/mergo v1.0.2 h1:85+piFYR1tMbRrLcDwR18y4UKJ3aH1Tbzi24VRW1TK8=
+dario.cat/mergo v1.0.2/go.mod h1:E/hbnu0NxMFBjpMIE34DRGLWqDy0g5FuKDhCb31ngxA=
 github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
 github.com/Microsoft/go-winio v0.6.1 h1:9/kr64B9VUZrLm5YYwbGtUJnMgqWVOdUAXu6Migciow=
 github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5+sAH+4kjUM=
-github.com/ProtonMail/go-crypto v0.0.0-20230717121422-5aa5874ade95 h1:KLq8BE0KwCL+mmXnjLWEAOYO+2l2AE4YMmqG1ZpZHBs=
-github.com/ProtonMail/go-crypto v0.0.0-20230717121422-5aa5874ade95/go.mod h1:EjAoLdwvbIOoOQr3ihjnSoLZRtE8azugULFRteWMNc0=
-github.com/acomagu/bufpipe v1.0.4 h1:e3H4WUzM3npvo5uv95QuJM3cQspFNtFBzvJ2oNjKIDQ=
-github.com/acomagu/bufpipe v1.0.4/go.mod h1:mxdxdup/WdsKVreO5GpW4+M/1CE2sMG4jeGJ2sYmHc4=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v0.0.0-20230923063757-afb1ddc0824c h1:kMFnB0vCcX7IL/m9Y5LO+KQYv+t1CQOiFe6+SV2J7bE=
+github.com/ProtonMail/go-crypto v0.0.0-20230923063757-afb1ddc0824c/go.mod h1:EjAoLdwvbIOoOQr3ihjnSoLZRtE8azugULFRteWMNc0=
+github.com/ProtonMail/go-crypto v1.3.0 h1:ILq8+Sf5If5DCpHQp4PbZdS1J7HDFRXz/+xKBiRGFrw=
+github.com/ProtonMail/go-crypto v1.3.0/go.mod h1:9whxjD8Rbs29b4XWbB8irEcE8KHMqaR2e7GWU1R+/PE=
 github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/bwesterb/go-ristretto v1.2.3/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
-github.com/cloudflare/circl v1.3.3 h1:fE/Qz0QdIGqeWfnwq0RE0R7MI51s0M2E4Ga9kq5AEMs=
 github.com/cloudflare/circl v1.3.3/go.mod h1:5XYMA4rFBvNIrhs50XuiBJ15vF2pZn4nnUKZrLbUZFA=
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+golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
+golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
+golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
@@ -94,14 +134,15 @@ golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug
 golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
-golang.org/x/net v0.12.0 h1:cfawfvKITfUsFCeJIHJrbSxpeu/E81khclypR0GVT50=
-golang.org/x/net v0.12.0/go.mod h1:zEVYFnQC7m/vmpQFELhcD1EWkZlX69l4oqgmer6hfKA=
-golang.org/x/net v0.14.0 h1:BONx9s002vGdD9umnlX1Po8vOZmrgH34qlHcD1MfK14=
-golang.org/x/net v0.14.0/go.mod h1:PpSgVXXLK0OxS0F31C1/tv6XNguvCrnXIDrFMspZIUI=
+golang.org/x/net v0.19.0 h1:zTwKpTd2XuCqf8huc7Fo2iSy+4RHPd10s4KzeTnVr1c=
+golang.org/x/net v0.19.0/go.mod h1:CfAk/cbD4CthTvqiEl8NpboMuiuOYsAr/7NOjZJtv1U=
+golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
+golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
+golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
+golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -115,17 +156,17 @@ golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
-golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
-golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
+golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
-golang.org/x/term v0.10.0 h1:3R7pNqamzBraeqj/Tj8qt1aQ2HpmlC+Cx/qL/7hn4/c=
-golang.org/x/term v0.11.0 h1:F9tnn/DA/Im8nCwm+fX+1/eBwi4qFjRT++MhtVC4ZX0=
+golang.org/x/term v0.15.0 h1:y/Oo/a/q3IXu26lQgl04j/gjuBDOBlx7X6Om1j2CPW4=
+golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
@@ -133,15 +174,16 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.11.0 h1:LAntKIrcmeSKERyiOh0XMV39LXS8IE9UL2yP7+f5ij4=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.11.0 h1:EMCa6U9S2LtZXLAMoWiR/R8dAQFRqbAitmbJ2UKhoi8=
-golang.org/x/tools v0.11.0/go.mod h1:anzJrxPjNtfgiYQYirP2CPGzGLxrH2u2QBhn6Bf3qY8=
-golang.org/x/tools v0.12.0 h1:YW6HUoUmYBpwSgyaGaZq1fHjrBjX1rlpZ54T6mu2kss=
-golang.org/x/tools v0.12.0/go.mod h1:Sc0INKfu04TlqNoRA1hgpFZbhYXHPr4V5DzpSBTPqQM=
+golang.org/x/tools v0.16.1 h1:TLyB3WofjdOEepBHAU20JdNC1Zbg87elYofWYAY5oZA=
+golang.org/x/tools v0.16.1/go.mod h1:kYVVN6I1mBNoB1OX+noeBjbRk4IUEPa7JJ+TJMEooJ0=
+golang.org/x/tools v0.41.0 h1:a9b8iMweWG+S0OBnlU36rzLp20z1Rp10w+IY2czHTQc=
+golang.org/x/tools v0.41.0/go.mod h1:XSY6eDqxVNiYgezAVqqCeihT4j1U2CCsqvH3WhQpnlg=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -150,7 +192,6 @@ gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EV
 gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

parse/mgconf.go

@@ -2,9 +2,10 @@ package parse
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 )
 
 var errAlreadyRegistered = os.ErrExist
@@ -50,11 +51,44 @@ func (m *MGConfig) AddRepo(path, remote string) error {
 	return nil
 }
 
+type Stats struct {
+	Duplicates int
+	NewPaths   []string
+}
+
+func (s Stats) String() string {
+	str := ""
+	for _, v := range s.NewPaths {
+		str += "Added repo " + v + "\n"
+	}
+	str += "\nAdded " + fmt.Sprintf("%d", len(s.NewPaths)) + " new repos\n"
+	str += "Skipped " + fmt.Sprintf("%d", s.Duplicates) + " duplicate repos"
+	return str
+}
+
+func (m *MGConfig) Merge(m2 MGConfig) (Stats, error) {
+	stats := Stats{}
+	for _, v := range m2.Repos {
+		err := m.AddRepo(v.Path, v.Remote)
+		switch err {
+		case errAlreadyRegistered:
+			stats.Duplicates++
+			continue
+		case nil:
+			stats.NewPaths = append(stats.NewPaths, v.Path)
+			continue
+		default:
+
+			return stats, err
+		}
+	}
+	return stats, nil
+}
+
 // LoadMGConfig loads the mgconfig file from the XDG_CONFIG_HOME directory
 // or from the default location of $HOME/.config/mgconfig
 // If the file is not found, an error is returned
 func LoadMGConfig() (MGConfig, error) {
-	var config MGConfig
 	mgConf := os.Getenv("MGCONFIG")
 	if mgConf == "" {
 		confDir := os.Getenv("XDG_CONFIG_HOME")
@@ -74,11 +108,38 @@ func LoadMGConfig() (MGConfig, error) {
 	if err != nil {
 		return MGConfig{}, err
 	}
-	err = json.Unmarshal(file, &config)
+	return ParseMGConfig(file)
+}
 
+// ParseMGConfig parses the mgconfig file from a byte slice
+func ParseMGConfig(b []byte) (MGConfig, error) {
+	var config MGConfig
+	err := json.Unmarshal(b, &config)
 	return config, err
 }
 
+// ExpandPaths expands shell variables in all repo paths using os.ExpandEnv.
+// This allows paths like $HOME/code or $GOPATH/src to work cross-platform.
+func (m *MGConfig) ExpandPaths() {
+	for i := range m.Repos {
+		m.Repos[i].Path = os.ExpandEnv(m.Repos[i].Path)
+	}
+}
+
+// CollapsePaths replaces the user's home directory with $HOME in all repo paths.
+// This allows config files to be shared across machines with different home paths.
+func (m *MGConfig) CollapsePaths() {
+	home, err := os.UserHomeDir()
+	if err != nil || home == "" {
+		return
+	}
+	for i := range m.Repos {
+		if strings.HasPrefix(m.Repos[i].Path, home) {
+			m.Repos[i].Path = "$HOME" + m.Repos[i].Path[len(home):]
+		}
+	}
+}
+
 func (m MGConfig) Save() error {
 	mgConf := os.Getenv("MGCONFIG")
 	if mgConf == "" {
@@ -95,9 +156,17 @@ func (m MGConfig) Save() error {
 		}
 		mgConf = filepath.Join(confDir, "mgconfig")
 	}
-	b, err := json.MarshalIndent(m, "", "  ")
+	// Collapse paths before saving so config is portable
+	toSave := MGConfig{
+		Repos:   make([]Repo, len(m.Repos)),
+		Aliases: m.Aliases,
+	}
+	copy(toSave.Repos, m.Repos)
+	toSave.CollapsePaths()
+
+	b, err := json.MarshalIndent(toSave, "", "  ")
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(mgConf, b, 0o644)
+	return os.WriteFile(mgConf, b, 0o644)
 }

parse/mgconf_test.go

@@ -0,0 +1,530 @@
+package parse
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestExpandPaths(t *testing.T) {
+	// Set up test environment variables
+	t.Setenv("HOME", "/home/testuser")
+	t.Setenv("GOPATH", "/home/testuser/go")
+	t.Setenv("CUSTOM_VAR", "/custom/path")
+
+	tests := []struct {
+		name     string
+		input    []Repo
+		expected []string
+	}{
+		{
+			name: "expand $HOME",
+			input: []Repo{
+				{Path: "$HOME/code/project", Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"/home/testuser/code/project"},
+		},
+		{
+			name: "expand multiple variables",
+			input: []Repo{
+				{Path: "$HOME/code/project", Remote: "git@github.com:user/project.git"},
+				{Path: "$GOPATH/src/github.com/user/repo", Remote: "git@github.com:user/repo.git"},
+			},
+			expected: []string{
+				"/home/testuser/code/project",
+				"/home/testuser/go/src/github.com/user/repo",
+			},
+		},
+		{
+			name: "expand custom variable",
+			input: []Repo{
+				{Path: "$CUSTOM_VAR/subdir", Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"/custom/path/subdir"},
+		},
+		{
+			name: "no expansion needed",
+			input: []Repo{
+				{Path: "/absolute/path/to/repo", Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"/absolute/path/to/repo"},
+		},
+		{
+			name: "empty repos",
+			input: []Repo{},
+			expected: []string{},
+		},
+		{
+			name: "undefined variable stays as-is",
+			input: []Repo{
+				{Path: "$UNDEFINED_VAR/code", Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"/code"}, // undefined vars expand to empty string
+		},
+		{
+			name: "braced variable syntax",
+			input: []Repo{
+				{Path: "${HOME}/code/project", Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"/home/testuser/code/project"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf := MGConfig{Repos: tt.input}
+			conf.ExpandPaths()
+
+			if len(conf.Repos) != len(tt.expected) {
+				t.Fatalf("expected %d repos, got %d", len(tt.expected), len(conf.Repos))
+			}
+
+			for i, repo := range conf.Repos {
+				if repo.Path != tt.expected[i] {
+					t.Errorf("repo %d: expected path %q, got %q", i, tt.expected[i], repo.Path)
+				}
+			}
+		})
+	}
+}
+
+func TestCollapsePaths(t *testing.T) {
+	// Get the actual home directory for this test
+	home, err := os.UserHomeDir()
+	if err != nil {
+		t.Fatalf("failed to get home directory: %v", err)
+	}
+
+	tests := []struct {
+		name     string
+		input    []Repo
+		expected []string
+	}{
+		{
+			name: "collapse home directory",
+			input: []Repo{
+				{Path: filepath.Join(home, "code/project"), Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"$HOME/code/project"},
+		},
+		{
+			name: "collapse multiple paths",
+			input: []Repo{
+				{Path: filepath.Join(home, "code/project1"), Remote: "git@github.com:user/project1.git"},
+				{Path: filepath.Join(home, "code/project2"), Remote: "git@github.com:user/project2.git"},
+			},
+			expected: []string{
+				"$HOME/code/project1",
+				"$HOME/code/project2",
+			},
+		},
+		{
+			name: "path not under home",
+			input: []Repo{
+				{Path: "/opt/repos/project", Remote: "git@github.com:user/project.git"},
+			},
+			expected: []string{"/opt/repos/project"},
+		},
+		{
+			name: "mixed paths",
+			input: []Repo{
+				{Path: filepath.Join(home, "code/project"), Remote: "git@github.com:user/project.git"},
+				{Path: "/opt/repos/other", Remote: "git@github.com:user/other.git"},
+			},
+			expected: []string{
+				"$HOME/code/project",
+				"/opt/repos/other",
+			},
+		},
+		{
+			name: "empty repos",
+			input: []Repo{},
+			expected: []string{},
+		},
+		{
+			name: "home directory itself",
+			input: []Repo{
+				{Path: home, Remote: "git@github.com:user/home.git"},
+			},
+			expected: []string{"$HOME"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf := MGConfig{Repos: tt.input}
+			conf.CollapsePaths()
+
+			if len(conf.Repos) != len(tt.expected) {
+				t.Fatalf("expected %d repos, got %d", len(tt.expected), len(conf.Repos))
+			}
+
+			for i, repo := range conf.Repos {
+				if repo.Path != tt.expected[i] {
+					t.Errorf("repo %d: expected path %q, got %q", i, tt.expected[i], repo.Path)
+				}
+			}
+		})
+	}
+}
+
+func TestExpandAndCollapse_Roundtrip(t *testing.T) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		t.Fatalf("failed to get home directory: %v", err)
+	}
+
+	// Start with $HOME-based paths (as stored in config)
+	original := MGConfig{
+		Repos: []Repo{
+			{Path: "$HOME/code/project1", Remote: "git@github.com:user/project1.git"},
+			{Path: "$HOME/go/src/github.com/user/repo", Remote: "git@github.com:user/repo.git"},
+			{Path: "/opt/external/repo", Remote: "git@github.com:user/external.git"},
+		},
+	}
+
+	// Expand paths (as done when loading)
+	conf := MGConfig{
+		Repos: make([]Repo, len(original.Repos)),
+	}
+	copy(conf.Repos, original.Repos)
+	conf.ExpandPaths()
+
+	// Verify expansion worked
+	expectedExpanded := []string{
+		filepath.Join(home, "code/project1"),
+		filepath.Join(home, "go/src/github.com/user/repo"),
+		"/opt/external/repo",
+	}
+	for i, repo := range conf.Repos {
+		if repo.Path != expectedExpanded[i] {
+			t.Errorf("after expand, repo %d: expected %q, got %q", i, expectedExpanded[i], repo.Path)
+		}
+	}
+
+	// Collapse paths (as done when saving)
+	conf.CollapsePaths()
+
+	// Verify we're back to the original
+	for i, repo := range conf.Repos {
+		if repo.Path != original.Repos[i].Path {
+			t.Errorf("after roundtrip, repo %d: expected %q, got %q", i, original.Repos[i].Path, repo.Path)
+		}
+	}
+}
+
+func TestSave_CollapsesPaths(t *testing.T) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		t.Fatalf("failed to get home directory: %v", err)
+	}
+
+	// Create a temp file for the config
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "mgconfig")
+	t.Setenv("MGCONFIG", configPath)
+
+	// Create config with expanded (absolute) paths
+	conf := MGConfig{
+		Repos: []Repo{
+			{Path: filepath.Join(home, "code/project"), Remote: "git@github.com:user/project.git"},
+			{Path: "/opt/external/repo", Remote: "git@github.com:user/external.git"},
+		},
+		Aliases: map[string]string{"test": "echo test"},
+	}
+
+	// Save should collapse paths
+	err = conf.Save()
+	if err != nil {
+		t.Fatalf("Save() failed: %v", err)
+	}
+
+	// Read back and verify paths are collapsed
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		t.Fatalf("failed to read saved config: %v", err)
+	}
+
+	var saved MGConfig
+	if err := json.Unmarshal(data, &saved); err != nil {
+		t.Fatalf("failed to parse saved config: %v", err)
+	}
+
+	expectedPaths := []string{
+		"$HOME/code/project",
+		"/opt/external/repo",
+	}
+
+	for i, repo := range saved.Repos {
+		if repo.Path != expectedPaths[i] {
+			t.Errorf("saved repo %d: expected path %q, got %q", i, expectedPaths[i], repo.Path)
+		}
+	}
+
+	// Verify original config wasn't modified
+	if conf.Repos[0].Path != filepath.Join(home, "code/project") {
+		t.Errorf("original config was modified: expected %q, got %q",
+			filepath.Join(home, "code/project"), conf.Repos[0].Path)
+	}
+}
+
+func TestParseMGConfig(t *testing.T) {
+	tests := []struct {
+		name      string
+		input     string
+		wantRepos int
+		wantErr   bool
+	}{
+		{
+			name: "valid config",
+			input: `{
+				"Repos": [
+					{"Path": "$HOME/code/project", "Remote": "git@github.com:user/project.git"}
+				],
+				"Aliases": {"gc": "git gc"}
+			}`,
+			wantRepos: 1,
+			wantErr:   false,
+		},
+		{
+			name:      "empty config",
+			input:     `{"Repos": [], "Aliases": {}}`,
+			wantRepos: 0,
+			wantErr:   false,
+		},
+		{
+			name:      "invalid json",
+			input:     `{invalid}`,
+			wantRepos: 0,
+			wantErr:   true,
+		},
+		{
+			name: "multiple repos",
+			input: `{
+				"Repos": [
+					{"Path": "$HOME/code/project1", "Remote": "git@github.com:user/project1.git"},
+					{"Path": "$HOME/code/project2", "Remote": "git@github.com:user/project2.git"}
+				]
+			}`,
+			wantRepos: 2,
+			wantErr:   false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf, err := ParseMGConfig([]byte(tt.input))
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ParseMGConfig() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !tt.wantErr && len(conf.Repos) != tt.wantRepos {
+				t.Errorf("ParseMGConfig() got %d repos, want %d", len(conf.Repos), tt.wantRepos)
+			}
+		})
+	}
+}
+
+func TestAddRepo(t *testing.T) {
+	tests := []struct {
+		name       string
+		initial    []Repo
+		addPath    string
+		addRemote  string
+		wantErr    bool
+		wantCount  int
+	}{
+		{
+			name:      "add to empty",
+			initial:   []Repo{},
+			addPath:   "$HOME/code/new",
+			addRemote: "git@github.com:user/new.git",
+			wantErr:   false,
+			wantCount: 1,
+		},
+		{
+			name: "add to existing",
+			initial: []Repo{
+				{Path: "$HOME/code/existing", Remote: "git@github.com:user/existing.git"},
+			},
+			addPath:   "$HOME/code/new",
+			addRemote: "git@github.com:user/new.git",
+			wantErr:   false,
+			wantCount: 2,
+		},
+		{
+			name: "add duplicate",
+			initial: []Repo{
+				{Path: "$HOME/code/existing", Remote: "git@github.com:user/existing.git"},
+			},
+			addPath:   "$HOME/code/existing",
+			addRemote: "git@github.com:user/existing.git",
+			wantErr:   true,
+			wantCount: 1,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf := MGConfig{Repos: tt.initial}
+			err := conf.AddRepo(tt.addPath, tt.addRemote)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("AddRepo() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			if len(conf.Repos) != tt.wantCount {
+				t.Errorf("AddRepo() repo count = %d, want %d", len(conf.Repos), tt.wantCount)
+			}
+		})
+	}
+}
+
+func TestDelRepo(t *testing.T) {
+	tests := []struct {
+		name      string
+		initial   []Repo
+		delPath   string
+		wantErr   bool
+		wantCount int
+	}{
+		{
+			name: "delete existing",
+			initial: []Repo{
+				{Path: "$HOME/code/project", Remote: "git@github.com:user/project.git"},
+			},
+			delPath:   "$HOME/code/project",
+			wantErr:   false,
+			wantCount: 0,
+		},
+		{
+			name: "delete from multiple",
+			initial: []Repo{
+				{Path: "$HOME/code/project1", Remote: "git@github.com:user/project1.git"},
+				{Path: "$HOME/code/project2", Remote: "git@github.com:user/project2.git"},
+			},
+			delPath:   "$HOME/code/project1",
+			wantErr:   false,
+			wantCount: 1,
+		},
+		{
+			name: "delete non-existent",
+			initial: []Repo{
+				{Path: "$HOME/code/project", Remote: "git@github.com:user/project.git"},
+			},
+			delPath:   "$HOME/code/other",
+			wantErr:   true,
+			wantCount: 1,
+		},
+		{
+			name:      "delete from empty",
+			initial:   []Repo{},
+			delPath:   "$HOME/code/project",
+			wantErr:   true,
+			wantCount: 0,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf := MGConfig{Repos: tt.initial}
+			err := conf.DelRepo(tt.delPath)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("DelRepo() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			if len(conf.Repos) != tt.wantCount {
+				t.Errorf("DelRepo() repo count = %d, want %d", len(conf.Repos), tt.wantCount)
+			}
+		})
+	}
+}
+
+func TestMerge(t *testing.T) {
+	tests := []struct {
+		name           string
+		initial        []Repo
+		merge          []Repo
+		wantCount      int
+		wantDuplicates int
+		wantNewPaths   int
+	}{
+		{
+			name:    "merge into empty",
+			initial: []Repo{},
+			merge: []Repo{
+				{Path: "$HOME/code/new", Remote: "git@github.com:user/new.git"},
+			},
+			wantCount:      1,
+			wantDuplicates: 0,
+			wantNewPaths:   1,
+		},
+		{
+			name: "merge with duplicates",
+			initial: []Repo{
+				{Path: "$HOME/code/existing", Remote: "git@github.com:user/existing.git"},
+			},
+			merge: []Repo{
+				{Path: "$HOME/code/existing", Remote: "git@github.com:user/existing.git"},
+				{Path: "$HOME/code/new", Remote: "git@github.com:user/new.git"},
+			},
+			wantCount:      2,
+			wantDuplicates: 1,
+			wantNewPaths:   1,
+		},
+		{
+			name: "merge all duplicates",
+			initial: []Repo{
+				{Path: "$HOME/code/project", Remote: "git@github.com:user/project.git"},
+			},
+			merge: []Repo{
+				{Path: "$HOME/code/project", Remote: "git@github.com:user/project.git"},
+			},
+			wantCount:      1,
+			wantDuplicates: 1,
+			wantNewPaths:   0,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf := MGConfig{Repos: tt.initial}
+			mergeConf := MGConfig{Repos: tt.merge}
+
+			stats, err := conf.Merge(mergeConf)
+			if err != nil {
+				t.Fatalf("Merge() unexpected error: %v", err)
+			}
+
+			if len(conf.Repos) != tt.wantCount {
+				t.Errorf("Merge() repo count = %d, want %d", len(conf.Repos), tt.wantCount)
+			}
+			if stats.Duplicates != tt.wantDuplicates {
+				t.Errorf("Merge() duplicates = %d, want %d", stats.Duplicates, tt.wantDuplicates)
+			}
+			if len(stats.NewPaths) != tt.wantNewPaths {
+				t.Errorf("Merge() new paths = %d, want %d", len(stats.NewPaths), tt.wantNewPaths)
+			}
+		})
+	}
+}
+
+func TestGetRepoPaths(t *testing.T) {
+	conf := MGConfig{
+		Repos: []Repo{
+			{Path: "$HOME/code/project1", Remote: "git@github.com:user/project1.git"},
+			{Path: "$HOME/code/project2", Remote: "git@github.com:user/project2.git"},
+		},
+	}
+
+	paths := conf.GetRepoPaths()
+
+	if len(paths) != 2 {
+		t.Fatalf("GetRepoPaths() returned %d paths, want 2", len(paths))
+	}
+
+	expected := []string{"$HOME/code/project1", "$HOME/code/project2"}
+	for i, path := range paths {
+		if path != expected[i] {
+			t.Errorf("GetRepoPaths()[%d] = %q, want %q", i, path, expected[i])
+		}
+	}
+}

parse/myrepos.go

@@ -3,7 +3,6 @@ package parse
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -33,9 +32,9 @@ func (m MRConfig) ToMGConfig() MGConfig {
 	mgconf := MGConfig(m)
 	for i, repo := range mgconf.Repos {
 		checkout := repo.Remote
-		if strings.HasPrefix(checkout, "git clone '") {
+		if after, ok := strings.CutPrefix(checkout, "git clone '"); ok {
 			// git clone 'git@bitbucket.org:taigrr/mg.git' 'mg'
-			remote := strings.TrimPrefix(checkout, "git clone '")
+			remote := after
 			sp := strings.Split(remote, "' '")
 			remote = sp[0]
 			mgconf.Repos[i].Remote = remote
@@ -60,7 +59,7 @@ func LoadMRConfig() (MRConfig, error) {
 	if s.IsDir() {
 		return MRConfig{}, errors.New("expected mrconfig file but got a directory")
 	}
-	f, err := ioutil.ReadFile(mrconfPath)
+	f, err := os.ReadFile(mrconfPath)
 	if err != nil {
 		return MRConfig{}, err
 	}