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package main
import (
"os"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
)
type exitCode int
const (
exitCodeSuccess exitCode = iota
exitCodeNotFound
exitCodeWrongSyntax
exitCodeCouldNotOpenRepository
exitCodeCouldNotParseRevision
exitCodeUnexpected
cmdDesc = "Returns the merge-base between two commits:"
helpShortMsg = `
usage: %_COMMAND_NAME_% <path> <commitRev> <commitRev>
or: %_COMMAND_NAME_% <path> --independent <commitRev>...
or: %_COMMAND_NAME_% <path> --is-ancestor <commitRev> <commitRev>
or: %_COMMAND_NAME_% --help
params:
<path> path to the git repository
<commitRev> git revision as supported by go-git
options:
(no options) lists the best common ancestors of the two passed commits
--independent list commits not reachable from the others
--is-ancestor is the first one ancestor of the other?
--help show the full help message of %_COMMAND_NAME_%
`
)
// Command that mimics `git merge-base --all <baseRev> <headRev>`
// Command that mimics `git merge-base --is-ancestor <baseRev> <headRev>`
// Command that mimics `git merge-base --independent <commitRev>...`
func main() {
if len(os.Args) == 1 {
helpAndExit("Returns the merge-base between two commits:", helpShortMsg, exitCodeSuccess)
}
if os.Args[1] == "--help" || os.Args[1] == "-h" {
helpAndExit("Returns the merge-base between two commits:", helpLongMsg, exitCodeSuccess)
}
if len(os.Args) < 4 {
helpAndExit("Wrong syntax", helpShortMsg, exitCodeWrongSyntax)
}
path := os.Args[1]
var modeIndependent, modeAncestor bool
var commitRevs []string
var res []*object.Commit
switch os.Args[2] {
case "--independent":
modeIndependent = true
commitRevs = os.Args[3:]
case "--is-ancestor":
modeAncestor = true
commitRevs = os.Args[3:]
if len(commitRevs) != 2 {
helpAndExit("Wrong syntax", helpShortMsg, exitCodeWrongSyntax)
}
default:
commitRevs = os.Args[2:]
if len(commitRevs) != 2 {
helpAndExit("Wrong syntax", helpShortMsg, exitCodeWrongSyntax)
}
}
// Open a git repository from current directory
repo, err := git.PlainOpen(path)
checkIfError(err, exitCodeCouldNotOpenRepository, "not in a git repository")
// Get the hashes of the passed revisions
var hashes []*plumbing.Hash
for _, rev := range commitRevs {
hash, err := repo.ResolveRevision(plumbing.Revision(rev))
checkIfError(err, exitCodeCouldNotParseRevision, "could not parse revision '%s'", rev)
hashes = append(hashes, hash)
}
// Get the commits identified by the passed hashes
var commits []*object.Commit
for _, hash := range hashes {
commit, err := repo.CommitObject(*hash)
checkIfError(err, exitCodeUnexpected, "could not find commit '%s'", hash.String())
commits = append(commits, commit)
}
if modeAncestor {
isAncestor, err := commits[0].IsAncestor(commits[1])
checkIfError(err, exitCodeUnexpected, "could not traverse the repository history")
if !isAncestor {
os.Exit(int(exitCodeNotFound))
}
os.Exit(int(exitCodeSuccess))
}
if modeIndependent {
res, err = object.Independents(commits)
checkIfError(err, exitCodeUnexpected, "could not traverse the repository history")
} else {
res, err = commits[0].MergeBase(commits[1])
checkIfError(err, exitCodeUnexpected, "could not traverse the repository history")
if len(res) == 0 {
os.Exit(int(exitCodeNotFound))
}
}
printCommits(res)
}
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