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branch_cmd.go
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/
branch_cmd.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright © 2021 Wrangle Ltd
package main
import (
"encoding/hex"
"fmt"
"strings"
"github.com/gobwas/glob"
"github.com/spf13/cobra"
"github.com/wrgl/core/pkg/conf"
conffs "github.com/wrgl/core/pkg/conf/fs"
"github.com/wrgl/core/pkg/objects"
"github.com/wrgl/core/pkg/ref"
"github.com/wrgl/core/pkg/slice"
"github.com/wrgl/core/wrgl/utils"
)
func newBranchCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "branch [BRANCH_NAME] [START_POINT]",
Short: "List, create, or delete branches",
Args: cobra.MaximumNArgs(2),
Example: strings.Join([]string{
` # list branches`,
` wrgl branch`,
``,
` # list branches that match a pattern`,
` wrgl branch -l <pattern>`,
``,
` # create a new branch`,
` wrgl branch <newbranch> <ref or commit sum>`,
``,
` # clone a new branch`,
` wrgl branch -c <newbranch> <oldbranch>`,
``,
` # rename a branch`,
` wrgl branch -m <newbranch> <oldbranch>`,
``,
` # delete a branch`,
` wrgl branch -d <branchname>`,
}, "\n"),
RunE: func(cmd *cobra.Command, args []string) error {
rd := getRepoDir(cmd)
wrglDir := utils.MustWRGLDir(cmd)
s := conffs.NewStore(wrglDir, conffs.AggregateSource, "")
c, err := s.Open()
if err != nil {
return err
}
quitIfRepoDirNotExist(cmd, rd)
db, err := rd.OpenObjectsStore()
if err != nil {
return err
}
defer db.Close()
rs := rd.OpenRefStore()
patterns, err := cmd.Flags().GetStringSlice("list")
if err != nil {
return err
}
globs := []glob.Glob{}
for _, pattern := range patterns {
g, err := glob.Compile(pattern)
if err != nil {
return err
}
globs = append(globs, g)
}
if len(args) == 0 || len(patterns) > 0 {
return listBranch(cmd, rs, globs)
}
newBranch, err := cmd.Flags().GetString("copy")
if err != nil {
return err
}
if newBranch != "" {
return copyBranch(cmd, c.User, rs, args[0], newBranch)
}
newBranch, err = cmd.Flags().GetString("move")
if err != nil {
return err
}
if newBranch != "" {
return moveBranch(cmd, rs, args[0], newBranch)
}
del, err := cmd.Flags().GetBool("delete")
if err != nil {
return err
}
if del {
return deleteBranch(cmd, rs, args)
}
return createBranch(cmd, c.User, db, rs, args)
},
}
cmd.Flags().StringSliceP("list", "l", nil, "list branches that match wildcard patterns")
cmd.Flags().StringP("copy", "c", "", "clone a branch and assign a new name to it")
cmd.Flags().StringP("move", "m", "", "rename a branch")
cmd.Flags().BoolP("delete", "d", false, "delete a branch")
return cmd
}
func listBranch(cmd *cobra.Command, rs ref.Store, globs []glob.Glob) error {
branchMap, err := ref.ListHeads(rs)
if err != nil {
return err
}
names := []string{}
for name := range branchMap {
names = slice.InsertToSortedStringSlice(names, name)
}
for _, name := range names {
if len(globs) > 0 {
for _, g := range globs {
if g.Match(name) {
fmt.Fprintln(cmd.OutOrStdout(), name)
break
}
}
} else {
fmt.Fprintln(cmd.OutOrStdout(), name)
}
}
return nil
}
func validateNewBranch(rs ref.Store, newBranch string) error {
if !ref.HeadPattern.MatchString(newBranch) {
return fmt.Errorf(`branch name "%s" is invalid`, newBranch)
}
_, err := ref.GetHead(rs, newBranch)
if err == nil {
return fmt.Errorf(`branch "%s" already exist`, newBranch)
}
return nil
}
func copyBranch(cmd *cobra.Command, u *conf.User, rs ref.Store, oldBranch, newBranch string) error {
err := validateNewBranch(rs, newBranch)
if err != nil {
return err
}
b, err := ref.GetHead(rs, oldBranch)
if err != nil {
return fmt.Errorf(`branch %q does not exist`, oldBranch)
}
_, err = ref.CopyRef(rs, "heads/"+oldBranch, "heads/"+newBranch)
if err != nil {
return err
}
cmd.Printf("created branch %s (%s)\n", newBranch, hex.EncodeToString(b))
return nil
}
func moveBranch(cmd *cobra.Command, rs ref.Store, oldBranch, newBranch string) error {
err := validateNewBranch(rs, newBranch)
if err != nil {
return err
}
_, err = ref.GetHead(rs, oldBranch)
if err != nil {
return fmt.Errorf(`branch %q does not exist`, oldBranch)
}
sum, err := ref.RenameRef(rs, "heads/"+oldBranch, "heads/"+newBranch)
if err != nil {
return err
}
cmd.Printf("created branch %s (%s)\n", newBranch, hex.EncodeToString(sum))
return nil
}
func deleteBranch(cmd *cobra.Command, rs ref.Store, args []string) error {
_, err := ref.GetHead(rs, args[0])
if err != nil {
return fmt.Errorf(`branch %q does not exist`, args[0])
}
err = ref.DeleteHead(rs, args[0])
if err != nil {
return err
}
cmd.Println("deleted branch", args[0])
return nil
}
func createBranch(cmd *cobra.Command, u *conf.User, db objects.Store, rs ref.Store, args []string) error {
if len(args) < 2 {
return fmt.Errorf("please specify both branch name and start point (could be branch name, commit hash)")
}
err := validateNewBranch(rs, args[0])
if err != nil {
return err
}
name, hash, commit, err := ref.InterpretCommitName(db, rs, args[1], false)
if err != nil {
return err
}
if commit == nil {
return fmt.Errorf(`commit "%s" not found`, args[1])
}
name = strings.TrimPrefix(name, "heads/")
err = ref.SaveRef(rs, "heads/"+args[0], hash, u.Name, u.Email, "branch", "created from "+name)
if err != nil {
return err
}
cmd.Printf("created branch %s (%s)\n", args[0], hex.EncodeToString(hash))
return nil
}