Enable revive linter, and fix a bunch of warnings

I took the set of enabled checks from revive's recommended configuration [1],
and removed some that I didn't like. There might be other useful checks in
revive that we might want to enable, but this is a nice improvement already.

The bulk of the changes here are removing unnecessary else statements after
returns, but there are a few others too.

[1] https://github.com/mgechev/revive?tab=readme-ov-file#recommended-configuration

pkg/commands/git_commands/branch_loader.go

@@ -356,9 +356,8 @@ func parseDifference(track string, regexStr string) string {
 	match := re.FindStringSubmatch(track)
 	if len(match) > 1 {
 		return match[1]
-	} else {
-		return "0"
 	}
+	return "0"
 }
 
 // TODO: only look at the new reflog commits, and otherwise store the recencies in

pkg/commands/git_commands/commit.go

@@ -149,9 +149,8 @@ func (self *CommitCommands) CommitEditorCmdObj() *oscommands.CmdObj {
 func (self *CommitCommands) signoffFlag() string {
 	if self.UserConfig().Git.Commit.SignOff {
 		return "--signoff"
-	} else {
-		return ""
 	}
+	return ""
 }
 
 func (self *CommitCommands) GetCommitMessage(commitHash string) (string, error) {

pkg/commands/git_commands/deps_test.go

@@ -97,7 +97,7 @@ func buildGitCommon(deps commonDeps) *GitCommon {
 
 func buildRepo() *gogit.Repository {
 	// TODO: think of a way to actually mock this out
-	var repo *gogit.Repository = nil
+	var repo *gogit.Repository
 	return repo
 }
 

pkg/commands/git_commands/git_command_builder.go

@@ -32,9 +32,8 @@ func (self *GitCommandBuilder) ArgIf(condition bool, ifTrue ...string) *GitComma
 func (self *GitCommandBuilder) ArgIfElse(condition bool, ifTrue string, ifFalse string) *GitCommandBuilder {
 	if condition {
 		return self.Arg(ifTrue)
-	} else {
-		return self.Arg(ifFalse)
 	}
+	return self.Arg(ifFalse)
 }
 
 func (self *GitCommandBuilder) Config(value string) *GitCommandBuilder {

pkg/commands/git_commands/rebase.go

@@ -327,9 +327,8 @@ func (self *RebaseCommands) MoveFixupCommitDown(commits []*models.Commit, target
 func todoFromCommit(commit *models.Commit) utils.Todo {
 	if commit.Action == todo.UpdateRef {
 		return utils.Todo{Ref: commit.Name}
-	} else {
-		return utils.Todo{Hash: commit.Hash()}
 	}
+	return utils.Todo{Hash: commit.Hash()}
 }
 
 // Sets the action for the given commits in the git-rebase-todo file
@@ -412,9 +411,9 @@ func (self *RebaseCommands) BeginInteractiveRebaseForCommit(
 			instruction:                daemon.NewInsertBreakInstruction(),
 			keepCommitsThatBecomeEmpty: keepCommitsThatBecomeEmpty,
 		}).Run()
-	} else {
-		return self.BeginInteractiveRebaseForCommitRange(commits, commitIndex, commitIndex, keepCommitsThatBecomeEmpty)
 	}
+
+	return self.BeginInteractiveRebaseForCommitRange(commits, commitIndex, commitIndex, keepCommitsThatBecomeEmpty)
 }
 
 func (self *RebaseCommands) BeginInteractiveRebaseForCommitRange(
@@ -574,7 +573,7 @@ func getBaseHashOrRoot(commits []*models.Commit, index int) string {
 	// at time of writing)
 	if index < len(commits) {
 		return commits[index].Hash()
-	} else {
-		return "--root"
 	}
+
+	return "--root"
 }

pkg/commands/git_commands/repo_paths.go

@@ -21,7 +21,7 @@ type RepoPaths struct {
 	isBareRepo         bool
 }
 
-var gitPathFormatVersion GitVersion = GitVersion{2, 31, 0, ""}
+var gitPathFormatVersion = GitVersion{2, 31, 0, ""}
 
 // Path to the current worktree. If we're in the main worktree, this will
 // be the same as RepoPath()

pkg/commands/git_commands/repo_paths_test.go

@@ -184,9 +184,7 @@ func TestGetRepoPaths(t *testing.T) {
 			Expected: nil,
 			Err: func(getRevParseArgs argFn) error {
 				args := strings.Join(getRevParseArgs(), " ")
-				return errors.New(
-					fmt.Sprintf("'git %v --show-toplevel --absolute-git-dir --git-common-dir --is-bare-repository --show-superproject-working-tree' failed: fatal: invalid gitfile format: /path/to/repo/worktree2/.git", args),
-				)
+				return fmt.Errorf("'git %v --show-toplevel --absolute-git-dir --git-common-dir --is-bare-repository --show-superproject-working-tree' failed: fatal: invalid gitfile format: /path/to/repo/worktree2/.git", args)
 			},
 		},
 	}

pkg/commands/git_commands/submodule.go

@@ -49,9 +49,8 @@ func (self *SubmoduleCommands) GetConfigs(parentModule *models.SubmoduleConfig)
 
 		if len(matches) > 0 {
 			return matches[1], true
-		} else {
-			return "", false
 		}
+		return "", false
 	}
 
 	configs := []*models.SubmoduleConfig{}

pkg/commands/git_commands/working_tree.go

@@ -66,9 +66,8 @@ func (self *WorkingTreeCommands) UnstageAll() error {
 func (self *WorkingTreeCommands) UnStageFile(paths []string, tracked bool) error {
 	if tracked {
 		return self.UnstageTrackedFiles(paths)
-	} else {
-		return self.UnstageUntrackedFiles(paths)
 	}
+	return self.UnstageUntrackedFiles(paths)
 }
 
 func (self *WorkingTreeCommands) UnstageTrackedFiles(paths []string) error {