register clone cmd

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: taigrr # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.gitignore

@@ -0,0 +1 @@
+cmd/mg/mg

README.md

@@ -0,0 +1,32 @@
+# mg
+
+Golang replacement for [myrepos](https://myrepos.branchable.com/) which only supports git repos.
+
+This app will support the following subcommands:
+
+- mg commit
+- mg push
+- mg status
+- mg diff
+- mg pull
+- mg fetch
+- mg register
+- mg unregister
+
+Passing the `-jX` argument will spin up X jobs simultaneously
+
+mg supports loading an existing ~/.mrconfig and migrating it to ~/.config/mg.conf, provided no mg.conf file exists.
+
+
+## Improvements over mr:
+1. No external dependencies (even git!*) 
+1. More output options (summary of failures)
+1. More deterministic behavior (global vs local run, register from git project subdir)
+1. Exports public functions and can be embedded into other Go programs idiomatically
+
+
+## Why to stick with mr:
+1. If you need support for non-git VCS tooling
+1. If you want to use the [mr plugin ecosystem](https://myrepos.branchable.com/#:~:text=repos%20to%20myrepos-,related%20software,-garden%3A%20manage%20git)
+
+*: custom-registered commands may rely on external applications.

cmd/mg/cmd/clone.go

@@ -0,0 +1,96 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"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))
+			for i := 0; i < jobs; i++ {
+				go func() {
+					for repo := range repoChan {
+						_, err := git.PlainOpenWithOptions(repo.Remote, &(git.PlainOpenOptions{DetectDotGit: true}))
+						if err == nil {
+							log.Printf("already cloned: %s\n", repo.Path)
+							mutex.Lock()
+							alreadyCloned++
+							mutex.Unlock()
+						} else if err == git.ErrRepositoryNotExists {
+							log.Printf("attempting clone: %s\n", repo)
+							_, 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)
+							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, err)
+							wg.Done()
+							continue
+						}
+					}
+				}()
+			}
+			for _, repo := range conf.Repos {
+				repoChan <- repo
+			}
+			close(repoChan)
+			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

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// commitCmd represents the commit command
+var commitCmd = &cobra.Command{
+	Use:   "commit",
+	Short: "commit all current repos with the same message",
+	Run: func(_ *cobra.Command, args []string) {
+		fmt.Println("commit called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(commitCmd)
+}

cmd/mg/cmd/common.go

@@ -0,0 +1,31 @@
+package cmd
+
+import (
+	"log"
+	"os"
+
+	"github.com/taigrr/mg/parse"
+)
+
+func GetConfig() parse.MGConfig {
+	conf, err := parse.LoadMGConfig()
+	if err != nil {
+		if os.IsNotExist(err) {
+			// Try to load mr config instead
+			mrconf, err := parse.LoadMRConfig()
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+
+			conf = mrconf.ToMGConfig()
+			log.Println("migrated mrconfig to mgconfig")
+			err = conf.Save()
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+		}
+	}
+	return conf
+}

cmd/mg/cmd/config.go

@@ -0,0 +1,21 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// configCmd represents the config command
+var configCmd = &cobra.Command{
+	Use:   "config",
+	Short: "",
+	Long:  ``,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("config called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(configCmd)
+}

cmd/mg/cmd/diff.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// diffCmd represents the diff command
+var diffCmd = &cobra.Command{
+	Use:   "diff",
+	Short: "compute a collective diff",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("diff called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(diffCmd)
+}

cmd/mg/cmd/fetch.go

@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var fetchCmd = &cobra.Command{
+	Use:   "fetch",
+	Short: "fetch all git repos without merging",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("fetch called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(fetchCmd)
+}

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

@@ -0,0 +1,103 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"sync"
+
+	git "github.com/go-git/go-git/v5"
+	"github.com/spf13/cobra"
+)
+
+// pullCmd represents the pull command
+var (
+	jobs    int
+	pullCmd = &cobra.Command{
+		Use:   "pull",
+		Short: "add current path to list of repos",
+		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 string, len(conf.Repos))
+			errs := []RepoError{}
+			alreadyUpToDate := 0
+			mutex := sync.Mutex{}
+			wg := sync.WaitGroup{}
+			wg.Add(len(conf.Repos))
+			for i := 0; i < jobs; i++ {
+				go func() {
+					for repo := range repoChan {
+						log.Printf("attempting pull: %s\n", repo)
+						r, err := git.PlainOpenWithOptions(repo, &(git.PlainOpenOptions{DetectDotGit: true}))
+						if err != nil {
+							mutex.Lock()
+							errs = append(errs, RepoError{Error: err, Repo: repo})
+							mutex.Unlock()
+							log.Printf("pull failed for %s: %v\n", repo, err)
+							wg.Done()
+							continue
+						}
+						w, err := r.Worktree()
+						if err != nil {
+							mutex.Lock()
+							errs = append(errs, RepoError{Error: err, Repo: repo})
+							mutex.Unlock()
+							log.Printf("pull failed for %s: %v\n", repo, err)
+							wg.Done()
+							continue
+						}
+						err = w.Pull(&git.PullOptions{})
+						if err == git.NoErrAlreadyUpToDate {
+							mutex.Lock()
+							alreadyUpToDate++
+							mutex.Unlock()
+							fmt.Printf("repo %s: already up to date\n", repo)
+							wg.Done()
+							continue
+						} else if err != nil {
+							mutex.Lock()
+							errs = append(errs, RepoError{Error: err, Repo: repo})
+							mutex.Unlock()
+							log.Printf("pull failed for %s: %v\n", repo, err)
+							wg.Done()
+							continue
+						} else {
+							fmt.Printf("successfully pulled %s\n", w.Filesystem.Root())
+						}
+						wg.Done()
+					}
+				}()
+			}
+			for _, repo := range conf.Repos {
+				repoChan <- repo.Path
+			}
+			close(repoChan)
+			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 pulled %d/%d repos\n", len(conf.Repos)-lenErrs, len(conf.Repos))
+			fmt.Printf("%d repos already up to date\n", alreadyUpToDate)
+			fmt.Printf("failed to pull %d/%d repos\n", lenErrs, len(conf.Repos))
+		},
+	}
+)
+
+func init() {
+	rootCmd.AddCommand(pullCmd)
+	pullCmd.Flags().IntVarP(&jobs, "jobs", "j", 1, "number of jobs to run in parallel")
+}

cmd/mg/cmd/push.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// pushCmd represents the push command
+var pushCmd = &cobra.Command{
+	Use:   "push",
+	Short: "push all git repos",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("push called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(pushCmd)
+}

cmd/mg/cmd/register.go

@@ -0,0 +1,72 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	git "github.com/go-git/go-git/v5"
+	"github.com/spf13/cobra"
+)
+
+var registerCmd = &cobra.Command{
+	Use:   "register",
+	Short: "add current path to list of repos",
+	Run: func(_ *cobra.Command, args []string) {
+		conf := GetConfig()
+		path, err := os.Getwd()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		if len(args) == 1 {
+			path = args[0]
+		} else if len(args) > 1 {
+			log.Println("too many arguments")
+			os.Exit(1)
+		}
+		r, err := git.PlainOpenWithOptions(path, &(git.PlainOpenOptions{DetectDotGit: true}))
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		remotes, err := r.Remotes()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		if len(remotes) == 0 {
+			log.Println("no remotes found")
+			os.Exit(1)
+		}
+		remote := remotes[0]
+		urls := remote.Config().URLs
+		if len(urls) == 0 {
+			log.Println("no urls found for remote")
+			os.Exit(1)
+		}
+		url := urls[0]
+		newPath, err := r.Worktree()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		path = newPath.Filesystem.Root()
+		for _, v := range conf.Repos {
+			if v.Path == path {
+				fmt.Printf("repo %s already registered\n", path)
+				os.Exit(0)
+			}
+		}
+		conf.AddRepo(path, url)
+		err = conf.Save()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(registerCmd)
+}

cmd/mg/cmd/root.go

@@ -0,0 +1,22 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// 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",
+}
+
+// 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)
+	}
+}

cmd/mg/cmd/status.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// statusCmd represents the status command
+var statusCmd = &cobra.Command{
+	Use:   "status",
+	Short: "get the combined git status for all git repos",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("status called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(statusCmd)
+}

cmd/mg/cmd/unregister.go

@@ -0,0 +1,60 @@
+package cmd
+
+import (
+	"log"
+	"os"
+
+	git "github.com/go-git/go-git/v5"
+	"github.com/spf13/cobra"
+)
+
+// unregisterCmd represents the unregister command
+var unregisterCmd = &cobra.Command{
+	Use:   "unregister",
+	Short: "add current path to list of repos",
+	Run: func(_ *cobra.Command, args []string) {
+		conf := GetConfig()
+		path, err := os.Getwd()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		if len(args) == 1 {
+			path = args[0]
+			err = conf.DelRepo(path)
+			if err != nil {
+				log.Println(err)
+				os.Exit(1)
+			}
+			return
+		} else if len(args) > 1 {
+			log.Println("too many arguments")
+			os.Exit(1)
+		}
+		r, err := git.PlainOpenWithOptions(path, &(git.PlainOpenOptions{DetectDotGit: true}))
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		newPath, err := r.Worktree()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		path = newPath.Filesystem.Root()
+		err = conf.DelRepo(path)
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+		err = conf.Save()
+		if err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(unregisterCmd)
+}

cmd/mg/main.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"github.com/taigrr/mg/cmd/mg/cmd"
+)
+
+func main() {
+	cmd.Execute()
+}

go.mod

@@ -1,3 +1,34 @@
 module github.com/taigrr/mg
 
-go 1.19
+go 1.21
+
+require (
+	github.com/go-git/go-git/v5 v5.11.0
+	github.com/spf13/cobra v1.8.0
+)
+
+require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/ProtonMail/go-crypto v0.0.0-20230923063757-afb1ddc0824c // indirect
+	github.com/cloudflare/circl v1.3.7 // indirect
+	github.com/cyphar/filepath-securejoin v0.2.4 // 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 v5.5.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // 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 v1.2.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
+	golang.org/x/crypto v0.17.0 // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/net v0.19.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/tools v0.16.1 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+)

go.sum

@@ -0,0 +1,153 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+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 v0.0.0-20230923063757-afb1ddc0824c h1:kMFnB0vCcX7IL/m9Y5LO+KQYv+t1CQOiFe6+SV2J7bE=
+github.com/ProtonMail/go-crypto v0.0.0-20230923063757-afb1ddc0824c/go.mod h1:EjAoLdwvbIOoOQr3ihjnSoLZRtE8azugULFRteWMNc0=
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+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/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=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+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/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

@@ -0,0 +1,141 @@
+package parse
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+var errAlreadyRegistered = os.ErrExist
+
+// MGConfig is the struct that represents the mgconfig file
+// It contains a slice of Repo structs and a map of aliases
+// The aliases map is a map of strings to strings, where the key is the alias
+// and the value is a command to be run
+type MGConfig struct {
+	Repos   []Repo
+	Aliases map[string]string
+}
+
+// GetRepoPaths returns a slice of strings containing the paths of the repos
+// in the mgconfig file
+
+func (m MGConfig) GetRepoPaths() []string {
+	paths := []string{}
+	for _, r := range m.Repos {
+		paths = append(paths, r.Path)
+	}
+	return paths
+}
+
+func (m *MGConfig) DelRepo(path string) error {
+	for i, v := range m.Repos {
+		if v.Path == path {
+			m.Repos = append(m.Repos[:i], m.Repos[i+1:]...)
+			return nil
+		}
+	}
+	return os.ErrNotExist
+}
+
+func (m *MGConfig) AddRepo(path, remote string) error {
+	for _, v := range m.Repos {
+		if v.Path == path {
+			return errAlreadyRegistered
+		}
+	}
+
+	m.Repos = append(m.Repos, Repo{Path: path, Remote: remote})
+	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) {
+	mgConf := os.Getenv("MGCONFIG")
+	if mgConf == "" {
+		confDir := os.Getenv("XDG_CONFIG_HOME")
+		if confDir == "" {
+			home, err := os.UserHomeDir()
+			if err != nil {
+				return MGConfig{}, err
+			}
+			confDir = filepath.Join(home, ".config")
+			if _, err := os.Stat(confDir); err != nil {
+				return MGConfig{}, err
+			}
+		}
+		mgConf = filepath.Join(confDir, "mgconfig")
+	}
+	file, err := os.ReadFile(mgConf)
+	if err != nil {
+		return MGConfig{}, err
+	}
+	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
+}
+
+func (m MGConfig) Save() error {
+	mgConf := os.Getenv("MGCONFIG")
+	if mgConf == "" {
+		confDir := os.Getenv("XDG_CONFIG_HOME")
+		if confDir == "" {
+			home, err := os.UserHomeDir()
+			if err != nil {
+				return err
+			}
+			confDir = filepath.Join(home, ".config")
+			if _, err := os.Stat(confDir); err != nil {
+				return err
+			}
+		}
+		mgConf = filepath.Join(confDir, "mgconfig")
+	}
+	b, err := json.MarshalIndent(m, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(mgConf, b, 0o644)
+}

parse/myrepos.go

@@ -3,22 +3,23 @@ package parse
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
 )
 
 type MRConfig struct {
-	Unregister string
-	GC         string
-	Repos      []Repo
+	Repos   []Repo
+	Aliases map[string]string
 }
 type Repo struct {
-	Path     string
-	Checkout string
+	Path    string
+	Remote  string
+	Aliases map[string]string `json:"aliases,omitempty"`
 }
 
+// GetRepoPaths returns a slice of strings containing the paths of all repos
+// in the MRConfig struct
 func (m MRConfig) GetRepoPaths() []string {
 	paths := []string{}
 	for _, r := range m.Repos {
@@ -27,6 +28,24 @@ func (m MRConfig) GetRepoPaths() []string {
 	return paths
 }
 
+func (m MRConfig) ToMGConfig() MGConfig {
+	mgconf := MGConfig(m)
+	for i, repo := range mgconf.Repos {
+		checkout := repo.Remote
+		if strings.HasPrefix(checkout, "git clone '") {
+			// git clone 'git@bitbucket.org:taigrr/mg.git' 'mg'
+			remote := strings.TrimPrefix(checkout, "git clone '")
+			sp := strings.Split(remote, "' '")
+			remote = sp[0]
+			mgconf.Repos[i].Remote = remote
+		}
+	}
+	return mgconf
+}
+
+// LoadMRConfig loads the mrconfig file from the user's home directory
+// and returns a MRConfig struct
+// TODO: load aliases into map instead of hardcoded Unregister prop
 func LoadMRConfig() (MRConfig, error) {
 	home, err := os.UserHomeDir()
 	if err != nil {
@@ -40,13 +59,16 @@ 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
 	}
 	text := string(f)
 	lines := strings.Split(text, "\n")
-	config := MRConfig{}
+	config := MRConfig{
+		Aliases: make(map[string]string),
+		Repos:   []Repo{},
+	}
 
 	length := -1
 	mode := "default"
@@ -81,13 +103,17 @@ func LoadMRConfig() (MRConfig, error) {
 			if split[0] != "checkout" {
 				return MRConfig{}, fmt.Errorf("unexpected argument on line %d: %s", n, line)
 			}
-			config.Repos[length].Checkout = split[1]
+
+			config.Repos[length].Remote = split[1]
+
 		case "default":
+
+			// TODO load text into Aliases map instead of hardcoded Unregister prop
 			switch split[0] {
 			case "unregister":
-				config.Unregister = split[1]
+				config.Aliases["unregister"] = split[1]
 			case "git_gc":
-				config.GC = split[1]
+				config.Aliases["gc"] = split[1]
 			default:
 				return MRConfig{}, fmt.Errorf("unexpected argument on line %d: %s", n, line)
 			}

parse/myrepos_test.go

@@ -0,0 +1,16 @@
+package parse
+
+import "testing"
+
+func TestLoadMRConfig(t *testing.T) {
+	// test cases for LoadMRConfig
+	tests := []struct {
+		id string
+	}{}
+
+	for _, test := range tests {
+		t.Run(test.id, func(t *testing.T) {
+			// TODO
+		})
+	}
+}