Make Commit.Parents a getter for an unexported parents field

This is exactly the same as what we did for Hash earlier. And for the same
reason: we want to turn the parents field into a slice of pointers.

Author: stefanhaller

pkg/commands/models/commit.go

@@ -54,7 +54,7 @@ type Commit struct {
 	Divergence    Divergence // set to DivergenceNone unless we are showing the divergence view
 
 	// Hashes of parent commits (will be multiple if it's a merge commit)
-	Parents []string
+	parents []string
 }
 
 type NewCommitOpts struct {
@@ -83,7 +83,7 @@ func NewCommit(hashPool *utils.StringPool, opts NewCommitOpts) *Commit {
 		AuthorEmail:   opts.AuthorEmail,
 		UnixTimestamp: opts.UnixTimestamp,
 		Divergence:    opts.Divergence,
-		Parents:       opts.Parents,
+		parents:       opts.Parents,
 	}
 }
 
@@ -114,8 +114,12 @@ func (c *Commit) ParentRefName() string {
 	return c.RefName() + "^"
 }
 
+func (c *Commit) Parents() []string {
+	return c.parents
+}
+
 func (c *Commit) IsFirstCommit() bool {
-	return len(c.Parents) == 0
+	return len(c.parents) == 0
 }
 
 func (c *Commit) ID() string {
@@ -127,7 +131,7 @@ func (c *Commit) Description() string {
 }
 
 func (c *Commit) IsMerge() bool {
-	return len(c.Parents) > 1
+	return len(c.parents) > 1
 }
 
 // returns true if this commit is not actually in the git log but instead

pkg/gui/presentation/graph/graph.go

@@ -116,7 +116,7 @@ func getNextPipes(prevPipes []*Pipe, commit *models.Commit, getStyle func(c *mod
 		return pipe.kind != TERMINATES
 	})
 
-	newPipes := make([]*Pipe, 0, len(currentPipes)+len(commit.Parents))
+	newPipes := make([]*Pipe, 0, len(currentPipes)+len(commit.Parents()))
 	// start by assuming that we've got a brand new commit not related to any preceding commit.
 	// (this only happens when we're doing `git log --all`). These will be tacked onto the far end.
 	pos := maxPos + 1
@@ -137,7 +137,7 @@ func getNextPipes(prevPipes []*Pipe, commit *models.Commit, getStyle func(c *mod
 	if commit.IsFirstCommit() {
 		toHash = models.EmptyTreeCommitHash
 	} else {
-		toHash = commit.Parents[0]
+		toHash = commit.Parents()[0]
 	}
 	newPipes = append(newPipes, &Pipe{
 		fromPos:  pos,
@@ -216,7 +216,7 @@ func getNextPipes(prevPipes []*Pipe, commit *models.Commit, getStyle func(c *mod
 	}
 
 	if commit.IsMerge() {
-		for _, parent := range commit.Parents[1:] {
+		for _, parent := range commit.Parents()[1:] {
 			availablePos := getNextAvailablePosForNewPipe()
 			// need to act as if continuing pipes are going to continue on the same line.
 			newPipes = append(newPipes, &Pipe{

pkg/gui/presentation/graph/graph_test.go

@@ -576,7 +576,7 @@ func generateCommits(count int) []*models.Commit {
 		// I need to pick a random number of parents to add
 		parentCount := rnd.Intn(2) + 1
 
-		parentHashes := currentCommit.Parents
+		parentHashes := currentCommit.Parents()
 		for j := 0; j < parentCount; j++ {
 			reuseParent := rnd.Intn(6) != 1 && j <= len(pool)-1 && j != 0
 			var newParent *models.Commit

pkg/gui/services/custom_commands/session_state_loader.go

@@ -37,7 +37,7 @@ func commitShimFromModelCommit(commit *models.Commit) *Commit {
 		AuthorEmail:   commit.AuthorEmail,
 		UnixTimestamp: commit.UnixTimestamp,
 		Divergence:    commit.Divergence,
-		Parents:       commit.Parents,
+		Parents:       commit.Parents(),
 	}
 }