factor out code from git.go

pkg/commands/branches.go

@@ -0,0 +1,157 @@
+package commands
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
+	"github.com/jesseduffield/lazygit/pkg/utils"
+)
+
+// NewBranch create new branch
+func (c *GitCommand) NewBranch(name string, base string) error {
+	return c.OSCommand.RunCommand("git checkout -b %s %s", name, base)
+}
+
+// CurrentBranchName get the current branch name and displayname.
+// the first returned string is the name and the second is the displayname
+// e.g. name is 123asdf and displayname is '(HEAD detached at 123asdf)'
+func (c *GitCommand) CurrentBranchName() (string, string, error) {
+	branchName, err := c.OSCommand.RunCommandWithOutput("git symbolic-ref --short HEAD")
+	if err == nil && branchName != "HEAD\n" {
+		trimmedBranchName := strings.TrimSpace(branchName)
+		return trimmedBranchName, trimmedBranchName, nil
+	}
+	output, err := c.OSCommand.RunCommandWithOutput("git branch --contains")
+	if err != nil {
+		return "", "", err
+	}
+	for _, line := range utils.SplitLines(output) {
+		re := regexp.MustCompile(CurrentBranchNameRegex)
+		match := re.FindStringSubmatch(line)
+		if len(match) > 0 {
+			branchName = match[1]
+			displayBranchName := match[0][2:]
+			return branchName, displayBranchName, nil
+		}
+	}
+	return "HEAD", "HEAD", nil
+}
+
+// DeleteBranch delete branch
+func (c *GitCommand) DeleteBranch(branch string, force bool) error {
+	command := "git branch -d"
+
+	if force {
+		command = "git branch -D"
+	}
+
+	return c.OSCommand.RunCommand("%s %s", command, branch)
+}
+
+// Checkout checks out a branch (or commit), with --force if you set the force arg to true
+type CheckoutOptions struct {
+	Force   bool
+	EnvVars []string
+}
+
+func (c *GitCommand) Checkout(branch string, options CheckoutOptions) error {
+	forceArg := ""
+	if options.Force {
+		forceArg = "--force "
+	}
+	return c.OSCommand.RunCommandWithOptions(fmt.Sprintf("git checkout %s %s", forceArg, branch), oscommands.RunCommandOptions{EnvVars: options.EnvVars})
+}
+
+// GetBranchGraph gets the color-formatted graph of the log for the given branch
+// Currently it limits the result to 100 commits, but when we get async stuff
+// working we can do lazy loading
+func (c *GitCommand) GetBranchGraph(branchName string) (string, error) {
+	cmdStr := c.GetBranchGraphCmdStr(branchName)
+	return c.OSCommand.RunCommandWithOutput(cmdStr)
+}
+
+func (c *GitCommand) GetUpstreamForBranch(branchName string) (string, error) {
+	output, err := c.OSCommand.RunCommandWithOutput("git rev-parse --abbrev-ref --symbolic-full-name %s@{u}", branchName)
+	return strings.TrimSpace(output), err
+}
+
+func (c *GitCommand) GetBranchGraphCmdStr(branchName string) string {
+	branchLogCmdTemplate := c.Config.GetUserConfig().GetString("git.branchLogCmd")
+	templateValues := map[string]string{
+		"branchName": branchName,
+	}
+	return utils.ResolvePlaceholderString(branchLogCmdTemplate, templateValues)
+}
+
+func (c *GitCommand) SetUpstreamBranch(upstream string) error {
+	return c.OSCommand.RunCommand("git branch -u %s", upstream)
+}
+
+func (c *GitCommand) SetBranchUpstream(remoteName string, remoteBranchName string, branchName string) error {
+	return c.OSCommand.RunCommand("git branch --set-upstream-to=%s/%s %s", remoteName, remoteBranchName, branchName)
+}
+
+func (c *GitCommand) GetCurrentBranchUpstreamDifferenceCount() (string, string) {
+	return c.GetCommitDifferences("HEAD", "HEAD@{u}")
+}
+
+func (c *GitCommand) GetBranchUpstreamDifferenceCount(branchName string) (string, string) {
+	return c.GetCommitDifferences(branchName, branchName+"@{u}")
+}
+
+// GetCommitDifferences checks how many pushables/pullables there are for the
+// current branch
+func (c *GitCommand) GetCommitDifferences(from, to string) (string, string) {
+	command := "git rev-list %s..%s --count"
+	pushableCount, err := c.OSCommand.RunCommandWithOutput(command, to, from)
+	if err != nil {
+		return "?", "?"
+	}
+	pullableCount, err := c.OSCommand.RunCommandWithOutput(command, from, to)
+	if err != nil {
+		return "?", "?"
+	}
+	return strings.TrimSpace(pushableCount), strings.TrimSpace(pullableCount)
+}
+
+type MergeOpts struct {
+	FastForwardOnly bool
+}
+
+// Merge merge
+func (c *GitCommand) Merge(branchName string, opts MergeOpts) error {
+	mergeArgs := c.Config.GetUserConfig().GetString("git.merging.args")
+
+	command := fmt.Sprintf("git merge --no-edit %s %s", mergeArgs, branchName)
+	if opts.FastForwardOnly {
+		command = fmt.Sprintf("%s --ff-only", command)
+	}
+
+	return c.OSCommand.RunCommand(command)
+}
+
+// AbortMerge abort merge
+func (c *GitCommand) AbortMerge() error {
+	return c.OSCommand.RunCommand("git merge --abort")
+}
+
+func (c *GitCommand) IsHeadDetached() bool {
+	err := c.OSCommand.RunCommand("git symbolic-ref -q HEAD")
+	return err != nil
+}
+
+// ResetHardHead runs `git reset --hard`
+func (c *GitCommand) ResetHard(ref string) error {
+	return c.OSCommand.RunCommand("git reset --hard " + ref)
+}
+
+// ResetSoft runs `git reset --soft HEAD`
+func (c *GitCommand) ResetSoft(ref string) error {
+	return c.OSCommand.RunCommand("git reset --soft " + ref)
+}
+
+func (c *GitCommand) RenameBranch(oldName string, newName string) error {
+	return c.OSCommand.RunCommand("git branch --move %s %s", oldName, newName)
+}

pkg/commands/commits.go

@@ -0,0 +1,93 @@
+package commands
+
+import (
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+
+	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
+	"github.com/jesseduffield/lazygit/pkg/models"
+)
+
+// RenameCommit renames the topmost commit with the given name
+func (c *GitCommand) RenameCommit(name string) error {
+	return c.OSCommand.RunCommand("git commit --allow-empty --amend -m %s", c.OSCommand.Quote(name))
+}
+
+// ResetToCommit reset to commit
+func (c *GitCommand) ResetToCommit(sha string, strength string, options oscommands.RunCommandOptions) error {
+	return c.OSCommand.RunCommandWithOptions(fmt.Sprintf("git reset --%s %s", strength, sha), options)
+}
+
+// Commit commits to git
+func (c *GitCommand) Commit(message string, flags string) (*exec.Cmd, error) {
+	command := fmt.Sprintf("git commit %s -m %s", flags, strconv.Quote(message))
+	if c.usingGpg() {
+		return c.OSCommand.ShellCommandFromString(command), nil
+	}
+
+	return nil, c.OSCommand.RunCommand(command)
+}
+
+// Get the subject of the HEAD commit
+func (c *GitCommand) GetHeadCommitMessage() (string, error) {
+	cmdStr := "git log -1 --pretty=%s"
+	message, err := c.OSCommand.RunCommandWithOutput(cmdStr)
+	return strings.TrimSpace(message), err
+}
+
+func (c *GitCommand) GetCommitMessage(commitSha string) (string, error) {
+	cmdStr := "git rev-list --format=%B --max-count=1 " + commitSha
+	messageWithHeader, err := c.OSCommand.RunCommandWithOutput(cmdStr)
+	message := strings.Join(strings.SplitAfter(messageWithHeader, "\n")[1:], "\n")
+	return strings.TrimSpace(message), err
+}
+
+// AmendHead amends HEAD with whatever is staged in your working tree
+func (c *GitCommand) AmendHead() (*exec.Cmd, error) {
+	command := "git commit --amend --no-edit --allow-empty"
+	if c.usingGpg() {
+		return c.OSCommand.ShellCommandFromString(command), nil
+	}
+
+	return nil, c.OSCommand.RunCommand(command)
+}
+
+// PrepareCommitAmendSubProcess prepares a subprocess for `git commit --amend --allow-empty`
+func (c *GitCommand) PrepareCommitAmendSubProcess() *exec.Cmd {
+	return c.OSCommand.PrepareSubProcess("git", "commit", "--amend", "--allow-empty")
+}
+
+func (c *GitCommand) ShowCmdStr(sha string, filterPath string) string {
+	filterPathArg := ""
+	if filterPath != "" {
+		filterPathArg = fmt.Sprintf(" -- %s", c.OSCommand.Quote(filterPath))
+	}
+	return fmt.Sprintf("git show --submodule --color=%s --no-renames --stat -p %s %s", c.colorArg(), sha, filterPathArg)
+}
+
+// Revert reverts the selected commit by sha
+func (c *GitCommand) Revert(sha string) error {
+	return c.OSCommand.RunCommand("git revert %s", sha)
+}
+
+// CherryPickCommits begins an interactive rebase with the given shas being cherry picked onto HEAD
+func (c *GitCommand) CherryPickCommits(commits []*models.Commit) error {
+	todo := ""
+	for _, commit := range commits {
+		todo = "pick " + commit.Sha + " " + commit.Name + "\n" + todo
+	}
+
+	cmd, err := c.PrepareInteractiveRebaseCommand("HEAD", todo, false)
+	if err != nil {
+		return err
+	}
+
+	return c.OSCommand.RunPreparedCommand(cmd)
+}
+
+// CreateFixupCommit creates a commit that fixes up a previous commit
+func (c *GitCommand) CreateFixupCommit(sha string) error {
+	return c.OSCommand.RunCommand("git commit --fixup=%s", sha)
+}

pkg/commands/config.go

@@ -0,0 +1,52 @@
+package commands
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/jesseduffield/lazygit/pkg/utils"
+)
+
+func (c *GitCommand) ConfiguredPager() string {
+	if os.Getenv("GIT_PAGER") != "" {
+		return os.Getenv("GIT_PAGER")
+	}
+	if os.Getenv("PAGER") != "" {
+		return os.Getenv("PAGER")
+	}
+	output, err := c.OSCommand.RunCommandWithOutput("git config --get-all core.pager")
+	if err != nil {
+		return ""
+	}
+	trimmedOutput := strings.TrimSpace(output)
+	return strings.Split(trimmedOutput, "\n")[0]
+}
+
+func (c *GitCommand) GetPager(width int) string {
+	useConfig := c.Config.GetUserConfig().GetBool("git.paging.useConfig")
+	if useConfig {
+		pager := c.ConfiguredPager()
+		return strings.Split(pager, "| less")[0]
+	}
+
+	templateValues := map[string]string{
+		"columnWidth": strconv.Itoa(width/2 - 6),
+	}
+
+	pagerTemplate := c.Config.GetUserConfig().GetString("git.paging.pager")
+	return utils.ResolvePlaceholderString(pagerTemplate, templateValues)
+}
+
+func (c *GitCommand) colorArg() string {
+	return c.Config.GetUserConfig().GetString("git.paging.colorArg")
+}
+
+func (c *GitCommand) GetConfigValue(key string) string {
+	output, err := c.OSCommand.RunCommandWithOutput("git config --get %s", key)
+	if err != nil {
+		// looks like this returns an error if there is no matching value which we're okay with
+		return ""
+	}
+	return strings.TrimSpace(output)
+}

pkg/commands/files.go

@@ -0,0 +1,270 @@
+package commands
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/go-errors/errors"
+	"github.com/jesseduffield/lazygit/pkg/models"
+	"github.com/jesseduffield/lazygit/pkg/utils"
+)
+
+// CatFile obtains the content of a file
+func (c *GitCommand) CatFile(fileName string) (string, error) {
+	return c.OSCommand.RunCommandWithOutput("%s %s", c.OSCommand.Platform.CatCmd, c.OSCommand.Quote(fileName))
+}
+
+// StageFile stages a file
+func (c *GitCommand) StageFile(fileName string) error {
+	// renamed files look like "file1 -> file2"
+	fileNames := strings.Split(fileName, " -> ")
+	return c.OSCommand.RunCommand("git add %s", c.OSCommand.Quote(fileNames[len(fileNames)-1]))
+}
+
+// StageAll stages all files
+func (c *GitCommand) StageAll() error {
+	return c.OSCommand.RunCommand("git add -A")
+}
+
+// UnstageAll stages all files
+func (c *GitCommand) UnstageAll() error {
+	return c.OSCommand.RunCommand("git reset")
+}
+
+// UnStageFile unstages a file
+func (c *GitCommand) UnStageFile(fileName string, tracked bool) error {
+	command := "git rm --cached %s"
+	if tracked {
+		command = "git reset HEAD %s"
+	}
+
+	// renamed files look like "file1 -> file2"
+	fileNames := strings.Split(fileName, " -> ")
+	for _, name := range fileNames {
+		if err := c.OSCommand.RunCommand(command, c.OSCommand.Quote(name)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *GitCommand) BeforeAndAfterFileForRename(file *models.File) (*models.File, *models.File, error) {
+
+	if !file.IsRename() {
+		return nil, nil, errors.New("Expected renamed file")
+	}
+
+	// we've got a file that represents a rename from one file to another. Unfortunately
+	// our File abstraction fails to consider this case, so here we will refetch
+	// all files, passing the --no-renames flag and then recursively call the function
+	// again for the before file and after file. At some point we should fix the abstraction itself
+
+	split := strings.Split(file.Name, " -> ")
+	filesWithoutRenames := c.GetStatusFiles(GetStatusFileOptions{NoRenames: true})
+	var beforeFile *models.File
+	var afterFile *models.File
+	for _, f := range filesWithoutRenames {
+		if f.Name == split[0] {
+			beforeFile = f
+		}
+		if f.Name == split[1] {
+			afterFile = f
+		}
+	}
+
+	if beforeFile == nil || afterFile == nil {
+		return nil, nil, errors.New("Could not find deleted file or new file for file rename")
+	}
+
+	if beforeFile.IsRename() || afterFile.IsRename() {
+		// probably won't happen but we want to ensure we don't get an infinite loop
+		return nil, nil, errors.New("Nested rename found")
+	}
+
+	return beforeFile, afterFile, nil
+}
+
+// DiscardAllFileChanges directly
+func (c *GitCommand) DiscardAllFileChanges(file *models.File) error {
+	if file.IsRename() {
+		beforeFile, afterFile, err := c.BeforeAndAfterFileForRename(file)
+		if err != nil {
+			return err
+		}
+
+		if err := c.DiscardAllFileChanges(beforeFile); err != nil {
+			return err
+		}
+
+		if err := c.DiscardAllFileChanges(afterFile); err != nil {
+			return err
+		}
+
+		return nil
+	}
+
+	// if the file isn't tracked, we assume you want to delete it
+	quotedFileName := c.OSCommand.Quote(file.Name)
+	if file.HasStagedChanges || file.HasMergeConflicts {
+		if err := c.OSCommand.RunCommand("git reset -- %s", quotedFileName); err != nil {
+			return err
+		}
+	}
+
+	if !file.Tracked {
+		return c.removeFile(file.Name)
+	}
+	return c.DiscardUnstagedFileChanges(file)
+}
+
+// DiscardUnstagedFileChanges directly
+func (c *GitCommand) DiscardUnstagedFileChanges(file *models.File) error {
+	quotedFileName := c.OSCommand.Quote(file.Name)
+	return c.OSCommand.RunCommand("git checkout -- %s", quotedFileName)
+}
+
+// Ignore adds a file to the gitignore for the repo
+func (c *GitCommand) Ignore(filename string) error {
+	return c.OSCommand.AppendLineToFile(".gitignore", filename)
+}
+
+// WorktreeFileDiff returns the diff of a file
+func (c *GitCommand) WorktreeFileDiff(file *models.File, plain bool, cached bool) string {
+	// for now we assume an error means the file was deleted
+	s, _ := c.OSCommand.RunCommandWithOutput(c.WorktreeFileDiffCmdStr(file, plain, cached))
+	return s
+}
+
+func (c *GitCommand) WorktreeFileDiffCmdStr(file *models.File, plain bool, cached bool) string {
+	cachedArg := ""
+	trackedArg := "--"
+	colorArg := c.colorArg()
+	split := strings.Split(file.Name, " -> ") // in case of a renamed file we get the new filename
+	fileName := c.OSCommand.Quote(split[len(split)-1])
+	if cached {
+		cachedArg = "--cached"
+	}
+	if !file.Tracked && !file.HasStagedChanges && !cached {
+		trackedArg = "--no-index /dev/null"
+	}
+	if plain {
+		colorArg = "never"
+	}
+
+	return fmt.Sprintf("git diff --submodule --no-ext-diff --color=%s %s %s %s", colorArg, cachedArg, trackedArg, fileName)
+}
+
+func (c *GitCommand) ApplyPatch(patch string, flags ...string) error {
+	filepath := filepath.Join(c.Config.GetUserConfigDir(), utils.GetCurrentRepoName(), time.Now().Format("Jan _2 15.04.05.000000000")+".patch")
+	c.Log.Infof("saving temporary patch to %s", filepath)
+	if err := c.OSCommand.CreateFileWithContent(filepath, patch); err != nil {
+		return err
+	}
+
+	flagStr := ""
+	for _, flag := range flags {
+		flagStr += " --" + flag
+	}
+
+	return c.OSCommand.RunCommand("git apply %s %s", flagStr, c.OSCommand.Quote(filepath))
+}
+
+// ShowFileDiff get the diff of specified from and to. Typically this will be used for a single commit so it'll be 123abc^..123abc
+// but when we're in diff mode it could be any 'from' to any 'to'. The reverse flag is also here thanks to diff mode.
+func (c *GitCommand) ShowFileDiff(from string, to string, reverse bool, fileName string, plain bool) (string, error) {
+	cmdStr := c.ShowFileDiffCmdStr(from, to, reverse, fileName, plain)
+	return c.OSCommand.RunCommandWithOutput(cmdStr)
+}
+
+func (c *GitCommand) ShowFileDiffCmdStr(from string, to string, reverse bool, fileName string, plain bool) string {
+	colorArg := c.colorArg()
+	if plain {
+		colorArg = "never"
+	}
+
+	reverseFlag := ""
+	if reverse {
+		reverseFlag = " -R "
+	}
+
+	return fmt.Sprintf("git diff --submodule --no-ext-diff --no-renames --color=%s %s %s %s -- %s", colorArg, from, to, reverseFlag, fileName)
+}
+
+// CheckoutFile checks out the file for the given commit
+func (c *GitCommand) CheckoutFile(commitSha, fileName string) error {
+	return c.OSCommand.RunCommand("git checkout %s %s", commitSha, fileName)
+}
+
+// DiscardOldFileChanges discards changes to a file from an old commit
+func (c *GitCommand) DiscardOldFileChanges(commits []*models.Commit, commitIndex int, fileName string) error {
+	if err := c.BeginInteractiveRebaseForCommit(commits, commitIndex); err != nil {
+		return err
+	}
+
+	// check if file exists in previous commit (this command returns an error if the file doesn't exist)
+	if err := c.OSCommand.RunCommand("git cat-file -e HEAD^:%s", fileName); err != nil {
+		if err := c.OSCommand.Remove(fileName); err != nil {
+			return err
+		}
+		if err := c.StageFile(fileName); err != nil {
+			return err
+		}
+	} else if err := c.CheckoutFile("HEAD^", fileName); err != nil {
+		return err
+	}
+
+	// amend the commit
+	cmd, err := c.AmendHead()
+	if cmd != nil {
+		return errors.New("received unexpected pointer to cmd")
+	}
+	if err != nil {
+		return err
+	}
+
+	// continue
+	return c.GenericMergeOrRebaseAction("rebase", "continue")
+}
+
+// DiscardAnyUnstagedFileChanges discards any unstages file changes via `git checkout -- .`
+func (c *GitCommand) DiscardAnyUnstagedFileChanges() error {
+	return c.OSCommand.RunCommand("git checkout -- .")
+}
+
+// RemoveTrackedFiles will delete the given file(s) even if they are currently tracked
+func (c *GitCommand) RemoveTrackedFiles(name string) error {
+	return c.OSCommand.RunCommand("git rm -r --cached %s", name)
+}
+
+// RemoveUntrackedFiles runs `git clean -fd`
+func (c *GitCommand) RemoveUntrackedFiles() error {
+	return c.OSCommand.RunCommand("git clean -fd")
+}
+
+// ResetAndClean removes all unstaged changes and removes all untracked files
+func (c *GitCommand) ResetAndClean() error {
+	submoduleConfigs, err := c.GetSubmoduleConfigs()
+	if err != nil {
+		return err
+	}
+
+	if len(submoduleConfigs) > 0 {
+		for _, config := range submoduleConfigs {
+			if err := c.SubmoduleStash(config); err != nil {
+				return err
+			}
+		}
+
+		if err := c.SubmoduleUpdateAll(); err != nil {
+			return err
+		}
+	}
+
+	if err := c.ResetHard("HEAD"); err != nil {
+		return err
+	}
+
+	return c.RemoveUntrackedFiles()
+}

pkg/commands/git_test.go

@@ -2012,7 +2012,7 @@ func TestGitCommandSkipEditorCommand(t *testing.T) {
 		)
 	})
 
-	_ = cmd.RunSkipEditorCommand("true")
+	_ = cmd.runSkipEditorCommand("true")
 }
 
 func TestFindDotGitDir(t *testing.T) {

pkg/commands/loading_files.go

@@ -8,6 +8,11 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/utils"
 )
 
+// GetStatusFiles git status files
+type GetStatusFileOptions struct {
+	NoRenames bool
+}
+
 func (c *GitCommand) GetStatusFiles(opts GetStatusFileOptions) []*models.File {
 	// check if config wants us ignoring untracked files
 	untrackedFilesSetting := c.GetConfigValue("status.showUntrackedFiles")
@@ -82,7 +87,7 @@ func (c *GitCommand) MergeStatusFiles(oldFiles, newFiles []*models.File, selecte
 	result := []*models.File{}
 	for _, oldFile := range oldFiles {
 		for newIndex, newFile := range newFiles {
-			if includesInt(appendedIndexes, newIndex) {
+			if utils.IncludesInt(appendedIndexes, newIndex) {
 				continue
 			}
 			// if we just staged B and in doing so created 'A -> B' and we are currently have oldFile: A and newFile: 'A -> B', we want to wait until we come across B so the our cursor isn't jumping anywhere
@@ -97,7 +102,7 @@ func (c *GitCommand) MergeStatusFiles(oldFiles, newFiles []*models.File, selecte
 
 	// append any new files to the end
 	for index, newFile := range newFiles {
-		if !includesInt(appendedIndexes, index) {
+		if !utils.IncludesInt(appendedIndexes, index) {
 			result = append(result, newFile)
 		}
 	}

pkg/commands/patch_rebases.go

@@ -16,7 +16,7 @@ func (c *GitCommand) DeletePatchesFromCommit(commits []*models.Commit, commitInd
 
 	// apply each patch in reverse
 	if err := p.ApplyPatches(true); err != nil {
-		if err := c.GenericMerge("rebase", "abort"); err != nil {
+		if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 			return err
 		}
 		return err
@@ -33,7 +33,7 @@ func (c *GitCommand) DeletePatchesFromCommit(commits []*models.Commit, commitInd
 	}
 
 	// continue
-	return c.GenericMerge("rebase", "continue")
+	return c.GenericMergeOrRebaseAction("rebase", "continue")
 }
 
 func (c *GitCommand) MovePatchToSelectedCommit(commits []*models.Commit, sourceCommitIdx int, destinationCommitIdx int, p *patch.PatchManager) error {
@@ -44,7 +44,7 @@ func (c *GitCommand) MovePatchToSelectedCommit(commits []*models.Commit, sourceC
 
 		// apply each patch forward
 		if err := p.ApplyPatches(false); err != nil {
-			if err := c.GenericMerge("rebase", "abort"); err != nil {
+			if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 				return err
 			}
 			return err
@@ -61,7 +61,7 @@ func (c *GitCommand) MovePatchToSelectedCommit(commits []*models.Commit, sourceC
 		}
 
 		// continue
-		return c.GenericMerge("rebase", "continue")
+		return c.GenericMergeOrRebaseAction("rebase", "continue")
 	}
 
 	if len(commits)-1 < sourceCommitIdx {
@@ -96,7 +96,7 @@ func (c *GitCommand) MovePatchToSelectedCommit(commits []*models.Commit, sourceC
 
 	// apply each patch in reverse
 	if err := p.ApplyPatches(true); err != nil {
-		if err := c.GenericMerge("rebase", "abort"); err != nil {
+		if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 			return err
 		}
 		return err
@@ -115,7 +115,7 @@ func (c *GitCommand) MovePatchToSelectedCommit(commits []*models.Commit, sourceC
 		// now we should be up to the destination, so let's apply forward these patches to that.
 		// ideally we would ensure we're on the right commit but I'm not sure if that check is necessary
 		if err := p.ApplyPatches(false); err != nil {
-			if err := c.GenericMerge("rebase", "abort"); err != nil {
+			if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 				return err
 			}
 			return err
@@ -131,10 +131,10 @@ func (c *GitCommand) MovePatchToSelectedCommit(commits []*models.Commit, sourceC
 			return nil
 		}
 
-		return c.GenericMerge("rebase", "continue")
+		return c.GenericMergeOrRebaseAction("rebase", "continue")
 	}
 
-	return c.GenericMerge("rebase", "continue")
+	return c.GenericMergeOrRebaseAction("rebase", "continue")
 }
 
 func (c *GitCommand) PullPatchIntoIndex(commits []*models.Commit, commitIdx int, p *patch.PatchManager, stash bool) error {
@@ -150,7 +150,7 @@ func (c *GitCommand) PullPatchIntoIndex(commits []*models.Commit, commitIdx int,
 
 	if err := p.ApplyPatches(true); err != nil {
 		if c.WorkingTreeState() == "rebasing" {
-			if err := c.GenericMerge("rebase", "abort"); err != nil {
+			if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 				return err
 			}
 		}
@@ -170,7 +170,7 @@ func (c *GitCommand) PullPatchIntoIndex(commits []*models.Commit, commitIdx int,
 		// add patches to index
 		if err := p.ApplyPatches(false); err != nil {
 			if c.WorkingTreeState() == "rebasing" {
-				if err := c.GenericMerge("rebase", "abort"); err != nil {
+				if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 					return err
 				}
 			}
@@ -187,7 +187,7 @@ func (c *GitCommand) PullPatchIntoIndex(commits []*models.Commit, commitIdx int,
 		return nil
 	}
 
-	return c.GenericMerge("rebase", "continue")
+	return c.GenericMergeOrRebaseAction("rebase", "continue")
 }
 
 func (c *GitCommand) PullPatchIntoNewCommit(commits []*models.Commit, commitIdx int, p *patch.PatchManager) error {
@@ -196,7 +196,7 @@ func (c *GitCommand) PullPatchIntoNewCommit(commits []*models.Commit, commitIdx
 	}
 
 	if err := p.ApplyPatches(true); err != nil {
-		if err := c.GenericMerge("rebase", "abort"); err != nil {
+		if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 			return err
 		}
 		return err
@@ -209,7 +209,7 @@ func (c *GitCommand) PullPatchIntoNewCommit(commits []*models.Commit, commitIdx
 
 	// add patches to index
 	if err := p.ApplyPatches(false); err != nil {
-		if err := c.GenericMerge("rebase", "abort"); err != nil {
+		if err := c.GenericMergeOrRebaseAction("rebase", "abort"); err != nil {
 			return err
 		}
 		return err
@@ -227,5 +227,5 @@ func (c *GitCommand) PullPatchIntoNewCommit(commits []*models.Commit, commitIdx
 	}
 
 	c.PatchManager.Reset()
-	return c.GenericMerge("rebase", "continue")
+	return c.GenericMergeOrRebaseAction("rebase", "continue")
 }

pkg/commands/rebasing.go

@@ -0,0 +1,287 @@
+package commands
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"github.com/go-errors/errors"
+	"github.com/jesseduffield/lazygit/pkg/models"
+	"github.com/mgutz/str"
+)
+
+func (c *GitCommand) RewordCommit(commits []*models.Commit, index int) (*exec.Cmd, error) {
+	todo, sha, err := c.GenerateGenericRebaseTodo(commits, index, "reword")
+	if err != nil {
+		return nil, err
+	}
+
+	return c.PrepareInteractiveRebaseCommand(sha, todo, false)
+}
+
+func (c *GitCommand) MoveCommitDown(commits []*models.Commit, index int) error {
+	// we must ensure that we have at least two commits after the selected one
+	if len(commits) <= index+2 {
+		// assuming they aren't picking the bottom commit
+		return errors.New(c.Tr.SLocalize("NoRoom"))
+	}
+
+	todo := ""
+	orderedCommits := append(commits[0:index], commits[index+1], commits[index])
+	for _, commit := range orderedCommits {
+		todo = "pick " + commit.Sha + " " + commit.Name + "\n" + todo
+	}
+
+	cmd, err := c.PrepareInteractiveRebaseCommand(commits[index+2].Sha, todo, true)
+	if err != nil {
+		return err
+	}
+
+	return c.OSCommand.RunPreparedCommand(cmd)
+}
+
+func (c *GitCommand) InteractiveRebase(commits []*models.Commit, index int, action string) error {
+	todo, sha, err := c.GenerateGenericRebaseTodo(commits, index, action)
+	if err != nil {
+		return err
+	}
+
+	cmd, err := c.PrepareInteractiveRebaseCommand(sha, todo, true)
+	if err != nil {
+		return err
+	}
+
+	return c.OSCommand.RunPreparedCommand(cmd)
+}
+
+// PrepareInteractiveRebaseCommand returns the cmd for an interactive rebase
+// we tell git to run lazygit to edit the todo list, and we pass the client
+// lazygit a todo string to write to the todo file
+func (c *GitCommand) PrepareInteractiveRebaseCommand(baseSha string, todo string, overrideEditor bool) (*exec.Cmd, error) {
+	ex := c.OSCommand.GetLazygitPath()
+
+	debug := "FALSE"
+	if c.OSCommand.Config.GetDebug() {
+		debug = "TRUE"
+	}
+
+	cmdStr := fmt.Sprintf("git rebase --interactive --autostash --keep-empty %s", baseSha)
+	c.Log.WithField("command", cmdStr).Info("RunCommand")
+	splitCmd := str.ToArgv(cmdStr)
+
+	cmd := c.OSCommand.Command(splitCmd[0], splitCmd[1:]...)
+
+	gitSequenceEditor := ex
+	if todo == "" {
+		gitSequenceEditor = "true"
+	}
+
+	cmd.Env = os.Environ()
+	cmd.Env = append(
+		cmd.Env,
+		"LAZYGIT_CLIENT_COMMAND=INTERACTIVE_REBASE",
+		"LAZYGIT_REBASE_TODO="+todo,
+		"DEBUG="+debug,
+		"LANG=en_US.UTF-8",   // Force using EN as language
+		"LC_ALL=en_US.UTF-8", // Force using EN as language
+		"GIT_SEQUENCE_EDITOR="+gitSequenceEditor,
+	)
+
+	if overrideEditor {
+		cmd.Env = append(cmd.Env, "GIT_EDITOR="+ex)
+	}
+
+	return cmd, nil
+}
+
+func (c *GitCommand) GenerateGenericRebaseTodo(commits []*models.Commit, actionIndex int, action string) (string, string, error) {
+	baseIndex := actionIndex + 1
+
+	if len(commits) <= baseIndex {
+		return "", "", errors.New(c.Tr.SLocalize("CannotRebaseOntoFirstCommit"))
+	}
+
+	if action == "squash" || action == "fixup" {
+		baseIndex++
+
+		if len(commits) <= baseIndex {
+			return "", "", errors.New(c.Tr.SLocalize("CannotSquashOntoSecondCommit"))
+		}
+	}
+
+	todo := ""
+	for i, commit := range commits[0:baseIndex] {
+		var commitAction string
+		if i == actionIndex {
+			commitAction = action
+		} else if commit.IsMerge {
+			// your typical interactive rebase will actually drop merge commits by default. Damn git CLI, you scary!
+			// doing this means we don't need to worry about rebasing over merges which always causes problems.
+			// you typically shouldn't be doing rebases that pass over merge commits anyway.
+			commitAction = "drop"
+		} else {
+			commitAction = "pick"
+		}
+		todo = commitAction + " " + commit.Sha + " " + commit.Name + "\n" + todo
+	}
+
+	return todo, commits[baseIndex].Sha, nil
+}
+
+// AmendTo amends the given commit with whatever files are staged
+func (c *GitCommand) AmendTo(sha string) error {
+	if err := c.CreateFixupCommit(sha); err != nil {
+		return err
+	}
+
+	return c.SquashAllAboveFixupCommits(sha)
+}
+
+// EditRebaseTodo sets the action at a given index in the git-rebase-todo file
+func (c *GitCommand) EditRebaseTodo(index int, action string) error {
+	fileName := filepath.Join(c.DotGitDir, "rebase-merge/git-rebase-todo")
+	bytes, err := ioutil.ReadFile(fileName)
+	if err != nil {
+		return err
+	}
+
+	content := strings.Split(string(bytes), "\n")
+	commitCount := c.getTodoCommitCount(content)
+
+	// we have the most recent commit at the bottom whereas the todo file has
+	// it at the bottom, so we need to subtract our index from the commit count
+	contentIndex := commitCount - 1 - index
+	splitLine := strings.Split(content[contentIndex], " ")
+	content[contentIndex] = action + " " + strings.Join(splitLine[1:], " ")
+	result := strings.Join(content, "\n")
+
+	return ioutil.WriteFile(fileName, []byte(result), 0644)
+}
+
+func (c *GitCommand) getTodoCommitCount(content []string) int {
+	// count lines that are not blank and are not comments
+	commitCount := 0
+	for _, line := range content {
+		if line != "" && !strings.HasPrefix(line, "#") {
+			commitCount++
+		}
+	}
+	return commitCount
+}
+
+// MoveTodoDown moves a rebase todo item down by one position
+func (c *GitCommand) MoveTodoDown(index int) error {
+	fileName := filepath.Join(c.DotGitDir, "rebase-merge/git-rebase-todo")
+	bytes, err := ioutil.ReadFile(fileName)
+	if err != nil {
+		return err
+	}
+
+	content := strings.Split(string(bytes), "\n")
+	commitCount := c.getTodoCommitCount(content)
+	contentIndex := commitCount - 1 - index
+
+	rearrangedContent := append(content[0:contentIndex-1], content[contentIndex], content[contentIndex-1])
+	rearrangedContent = append(rearrangedContent, content[contentIndex+1:]...)
+	result := strings.Join(rearrangedContent, "\n")
+
+	return ioutil.WriteFile(fileName, []byte(result), 0644)
+}
+
+// SquashAllAboveFixupCommits squashes all fixup! commits above the given one
+func (c *GitCommand) SquashAllAboveFixupCommits(sha string) error {
+	return c.runSkipEditorCommand(
+		fmt.Sprintf(
+			"git rebase --interactive --autostash --autosquash %s^",
+			sha,
+		),
+	)
+}
+
+// BeginInteractiveRebaseForCommit starts an interactive rebase to edit the current
+// commit and pick all others. After this you'll want to call `c.GenericMergeOrRebaseAction("rebase", "continue")`
+func (c *GitCommand) BeginInteractiveRebaseForCommit(commits []*models.Commit, commitIndex int) error {
+	if len(commits)-1 < commitIndex {
+		return errors.New("index outside of range of commits")
+	}
+
+	// we can make this GPG thing possible it just means we need to do this in two parts:
+	// one where we handle the possibility of a credential request, and the other
+	// where we continue the rebase
+	if c.usingGpg() {
+		return errors.New(c.Tr.SLocalize("DisabledForGPG"))
+	}
+
+	todo, sha, err := c.GenerateGenericRebaseTodo(commits, commitIndex, "edit")
+	if err != nil {
+		return err
+	}
+
+	cmd, err := c.PrepareInteractiveRebaseCommand(sha, todo, true)
+	if err != nil {
+		return err
+	}
+
+	if err := c.OSCommand.RunPreparedCommand(cmd); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// RebaseBranch interactive rebases onto a branch
+func (c *GitCommand) RebaseBranch(branchName string) error {
+	cmd, err := c.PrepareInteractiveRebaseCommand(branchName, "", false)
+	if err != nil {
+		return err
+	}
+
+	return c.OSCommand.RunPreparedCommand(cmd)
+}
+
+// GenericMerge takes a commandType of "merge" or "rebase" and a command of "abort", "skip" or "continue"
+// By default we skip the editor in the case where a commit will be made
+func (c *GitCommand) GenericMergeOrRebaseAction(commandType string, command string) error {
+	err := c.runSkipEditorCommand(
+		fmt.Sprintf(
+			"git %s --%s",
+			commandType,
+			command,
+		),
+	)
+	if err != nil {
+		if !strings.Contains(err.Error(), "no rebase in progress") {
+			return err
+		}
+		c.Log.Warn(err)
+	}
+
+	// sometimes we need to do a sequence of things in a rebase but the user needs to
+	// fix merge conflicts along the way. When this happens we queue up the next step
+	// so that after the next successful rebase continue we can continue from where we left off
+	if commandType == "rebase" && command == "continue" && c.onSuccessfulContinue != nil {
+		f := c.onSuccessfulContinue
+		c.onSuccessfulContinue = nil
+		return f()
+	}
+	if command == "abort" {
+		c.onSuccessfulContinue = nil
+	}
+	return nil
+}
+
+func (c *GitCommand) runSkipEditorCommand(command string) error {
+	cmd := c.OSCommand.ExecutableFromString(command)
+	lazyGitPath := c.OSCommand.GetLazygitPath()
+	cmd.Env = append(
+		cmd.Env,
+		"LAZYGIT_CLIENT_COMMAND=EXIT_IMMEDIATELY",
+		"GIT_EDITOR="+lazyGitPath,
+		"EDITOR="+lazyGitPath,
+		"VISUAL="+lazyGitPath,
+	)
+	return c.OSCommand.RunExecutable(cmd)
+}

pkg/commands/remotes.go

@@ -0,0 +1,40 @@
+package commands
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/models"
+)
+
+func (c *GitCommand) AddRemote(name string, url string) error {
+	return c.OSCommand.RunCommand("git remote add %s %s", name, url)
+}
+
+func (c *GitCommand) RemoveRemote(name string) error {
+	return c.OSCommand.RunCommand("git remote remove %s", name)
+}
+
+func (c *GitCommand) RenameRemote(oldRemoteName string, newRemoteName string) error {
+	return c.OSCommand.RunCommand("git remote rename %s %s", oldRemoteName, newRemoteName)
+}
+
+func (c *GitCommand) UpdateRemoteUrl(remoteName string, updatedUrl string) error {
+	return c.OSCommand.RunCommand("git remote set-url %s %s", remoteName, updatedUrl)
+}
+
+func (c *GitCommand) DeleteRemoteBranch(remoteName string, branchName string) error {
+	return c.OSCommand.RunCommand("git push %s --delete %s", remoteName, branchName)
+}
+
+// CheckRemoteBranchExists Returns remote branch
+func (c *GitCommand) CheckRemoteBranchExists(branch *models.Branch) bool {
+	_, err := c.OSCommand.RunCommandWithOutput(
+		"git show-ref --verify -- refs/remotes/origin/%s",
+		branch.Name,
+	)
+
+	return err == nil
+}
+
+// GetRemoteURL returns current repo remote url
+func (c *GitCommand) GetRemoteURL() string {
+	return c.GetConfigValue("remote.origin.url")
+}

pkg/commands/stash_entries.go

@@ -0,0 +1,58 @@
+package commands
+
+import "fmt"
+
+// StashDo modify stash
+func (c *GitCommand) StashDo(index int, method string) error {
+	return c.OSCommand.RunCommand("git stash %s stash@{%d}", method, index)
+}
+
+// StashSave save stash
+// TODO: before calling this, check if there is anything to save
+func (c *GitCommand) StashSave(message string) error {
+	return c.OSCommand.RunCommand("git stash save %s", c.OSCommand.Quote(message))
+}
+
+// GetStashEntryDiff stash diff
+func (c *GitCommand) ShowStashEntryCmdStr(index int) string {
+	return fmt.Sprintf("git stash show -p --stat --color=%s stash@{%d}", c.colorArg(), index)
+}
+
+// StashSaveStagedChanges stashes only the currently staged changes. This takes a few steps
+// shoutouts to Joe on https://stackoverflow.com/questions/14759748/stashing-only-staged-changes-in-git-is-it-possible
+func (c *GitCommand) StashSaveStagedChanges(message string) error {
+
+	if err := c.OSCommand.RunCommand("git stash --keep-index"); err != nil {
+		return err
+	}
+
+	if err := c.StashSave(message); err != nil {
+		return err
+	}
+
+	if err := c.OSCommand.RunCommand("git stash apply stash@{1}"); err != nil {
+		return err
+	}
+
+	if err := c.OSCommand.PipeCommands("git stash show -p", "git apply -R"); err != nil {
+		return err
+	}
+
+	if err := c.OSCommand.RunCommand("git stash drop stash@{1}"); err != nil {
+		return err
+	}
+
+	// if you had staged an untracked file, that will now appear as 'AD' in git status
+	// meaning it's deleted in your working tree but added in your index. Given that it's
+	// now safely stashed, we need to remove it.
+	files := c.GetStatusFiles(GetStatusFileOptions{})
+	for _, file := range files {
+		if file.ShortStatus == "AD" {
+			if err := c.UnStageFile(file.Name, false); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}

pkg/commands/status.go

@@ -0,0 +1,48 @@
+package commands
+
+import (
+	"path/filepath"
+
+	gogit "github.com/go-git/go-git/v5"
+)
+
+// RebaseMode returns "" for non-rebase mode, "normal" for normal rebase
+// and "interactive" for interactive rebase
+func (c *GitCommand) RebaseMode() (string, error) {
+	exists, err := c.OSCommand.FileExists(filepath.Join(c.DotGitDir, "rebase-apply"))
+	if err != nil {
+		return "", err
+	}
+	if exists {
+		return "normal", nil
+	}
+	exists, err = c.OSCommand.FileExists(filepath.Join(c.DotGitDir, "rebase-merge"))
+	if exists {
+		return "interactive", err
+	} else {
+		return "", err
+	}
+}
+
+func (c *GitCommand) WorkingTreeState() string {
+	rebaseMode, _ := c.RebaseMode()
+	if rebaseMode != "" {
+		return "rebasing"
+	}
+	merging, _ := c.IsInMergeState()
+	if merging {
+		return "merging"
+	}
+	return "normal"
+}
+
+// IsInMergeState states whether we are still mid-merge
+func (c *GitCommand) IsInMergeState() (bool, error) {
+	return c.OSCommand.FileExists(filepath.Join(c.DotGitDir, "MERGE_HEAD"))
+}
+
+func (c *GitCommand) IsBareRepo() bool {
+	// note: could use `git rev-parse --is-bare-repository` if we wanna drop go-git
+	_, err := c.Repo.Worktree()
+	return err == gogit.ErrIsBareRepository
+}

pkg/commands/sync.go

@@ -0,0 +1,74 @@
+package commands
+
+import (
+	"fmt"
+	"strings"
+)
+
+// usingGpg tells us whether the user has gpg enabled so that we can know
+// whether we need to run a subprocess to allow them to enter their password
+func (c *GitCommand) usingGpg() bool {
+	overrideGpg := c.Config.GetUserConfig().GetBool("git.overrideGpg")
+	if overrideGpg {
+		return false
+	}
+
+	gpgsign, _ := c.getLocalGitConfig("commit.gpgsign")
+	if gpgsign == "" {
+		gpgsign, _ = c.getGlobalGitConfig("commit.gpgsign")
+	}
+	value := strings.ToLower(gpgsign)
+
+	return value == "true" || value == "1" || value == "yes" || value == "on"
+}
+
+// Push pushes to a branch
+func (c *GitCommand) Push(branchName string, force bool, upstream string, args string, promptUserForCredential func(string) string) error {
+	forceFlag := ""
+	if force {
+		forceFlag = "--force-with-lease"
+	}
+
+	setUpstreamArg := ""
+	if upstream != "" {
+		setUpstreamArg = "--set-upstream " + upstream
+	}
+
+	cmd := fmt.Sprintf("git push --follow-tags %s %s %s", forceFlag, setUpstreamArg, args)
+	return c.OSCommand.DetectUnamePass(cmd, promptUserForCredential)
+}
+
+type FetchOptions struct {
+	PromptUserForCredential func(string) string
+	RemoteName              string
+	BranchName              string
+}
+
+// Fetch fetch git repo
+func (c *GitCommand) Fetch(opts FetchOptions) error {
+	command := "git fetch"
+
+	if opts.RemoteName != "" {
+		command = fmt.Sprintf("%s %s", command, opts.RemoteName)
+	}
+	if opts.BranchName != "" {
+		command = fmt.Sprintf("%s %s", command, opts.BranchName)
+	}
+
+	return c.OSCommand.DetectUnamePass(command, func(question string) string {
+		if opts.PromptUserForCredential != nil {
+			return opts.PromptUserForCredential(question)
+		}
+		return "\n"
+	})
+}
+
+func (c *GitCommand) FastForward(branchName string, remoteName string, remoteBranchName string, promptUserForCredential func(string) string) error {
+	command := fmt.Sprintf("git fetch %s %s:%s", remoteName, remoteBranchName, branchName)
+	return c.OSCommand.DetectUnamePass(command, promptUserForCredential)
+}
+
+func (c *GitCommand) FetchRemote(remoteName string, promptUserForCredential func(string) string) error {
+	command := fmt.Sprintf("git fetch %s", remoteName)
+	return c.OSCommand.DetectUnamePass(command, promptUserForCredential)
+}

pkg/commands/tags.go

@@ -0,0 +1,13 @@
+package commands
+
+func (c *GitCommand) CreateLightweightTag(tagName string, commitSha string) error {
+	return c.OSCommand.RunCommand("git tag %s %s", tagName, commitSha)
+}
+
+func (c *GitCommand) DeleteTag(tagName string) error {
+	return c.OSCommand.RunCommand("git tag -d %s", tagName)
+}
+
+func (c *GitCommand) PushTag(remoteName string, tagName string) error {
+	return c.OSCommand.RunCommand("git push %s %s", remoteName, tagName)
+}

pkg/gui/rebase_options_panel.go

@@ -53,7 +53,7 @@ func (gui *Gui) genericMergeCommand(command string) error {
 		}
 		return nil
 	}
-	result := gui.GitCommand.GenericMerge(commandType, command)
+	result := gui.GitCommand.GenericMergeOrRebaseAction(commandType, command)
 	if err := gui.handleGenericMergeCommandResult(result); err != nil {
 		return err
 	}

pkg/gui/remotes_panel.go

@@ -161,9 +161,9 @@ func (gui *Gui) handleFetchRemote(g *gocui.Gui, v *gocui.View) error {
 		gui.State.FetchMutex.Lock()
 		defer gui.State.FetchMutex.Unlock()
 
-		if err := gui.GitCommand.FetchRemote(remote.Name); err != nil {
-			return err
-		}
+		// TODO: test this
+		err := gui.GitCommand.FetchRemote(remote.Name, gui.promptUserForCredential)
+		gui.handleCredentialsPopup(err)
 
 		return gui.refreshSidePanels(refreshOptions{scope: []int{BRANCHES, REMOTES}})
 	})