rephrase wording and add comments

Author: mjarkk

pkg/commands/branches.go

@@ -101,7 +101,10 @@ func (c *GitCommand) GetBranchUpstreamDifferenceCount(branchName string) (string
 	return c.GetCommitDifferences(branchName, branchName+"@{u}")
 }
 
-func (c *GitCommand) GetMainBranch() string {
+// TryGetMainBranch tries to get the main branch
+// For old repo's this is usually master and for newer once it is main
+func (c *GitCommand) TryGetMainBranch() string {
+	// Firstly try to get the main branch from the origins
 	cmdStr := `git branch --remotes --list '*/HEAD' --format '%(symref)'`
 	output, _ := c.OSCommand.RunCommandWithOutput(cmdStr)
 	lines := strings.Split(strings.TrimSpace(output), "\n")
@@ -112,6 +115,7 @@ func (c *GitCommand) GetMainBranch() string {
 		}
 	}
 
+	// If we didn't find a main branch from the remotes we check if there is a main or master branch
 	cmdStr = `git branch --format "%(refname:short)" --list "master" --list "main"`
 	output, _ = c.OSCommand.RunCommandWithOutput(cmdStr)
 	lines = append(lines[:0], strings.Split(strings.TrimSpace(output), "\n")...)

pkg/commands/loading_commits.go

@@ -312,7 +312,7 @@ func (c *CommitListBuilder) setCommitMergedStatuses(refName string, commits []*m
 }
 
 func (c *CommitListBuilder) getMergeBase(refName string) (string, error) {
-	baseBranch := c.GitCommand.GetMainBranch()
+	baseBranch := c.GitCommand.TryGetMainBranch()
 	if baseBranch == "" {
 		baseBranch = "master"
 	}