Use first class task objects instead of global counter

The global counter approach is easy to understand but it's brittle and depends on implicit behaviour that is not very discoverable.

With a global counter, if any goroutine accidentally decrements the counter twice, we'll think lazygit is idle when it's actually busy.
Likewise if a goroutine accidentally increments the counter twice we'll think lazygit is busy when it's actually idle.
With the new approach we have a map of tasks where each task can either be busy or not. We create a new task and add it to the map
when we spawn a worker goroutine (among other things) and we remove it once the task is done.

The task can also be paused and continued for situations where we switch back and forth between running a program and asking for user
input.

In order for this to work with `git push` (and other commands that require credentials) we need to obtain the task from gocui when
we create the worker goroutine, and then pass it along to the commands package to pause/continue the task as required. This is
MUCH more discoverable than the old approach which just decremented and incremented the global counter from within the commands package,
but it's at the cost of expanding some function signatures (arguably a good thing).

Likewise, whenever you want to call WithWaitingStatus or WithLoaderPanel the callback will now have access to the task for pausing/
continuing. We only need to actually make use of this functionality in a couple of places so it's a high price to pay, but I don't
know if I want to introduce a WithWaitingStatusTask and WithLoaderPanelTask function (open to suggestions).

pkg/commands/git_commands/remote.go

@@ -2,6 +2,8 @@ package git_commands
 
 import (
 	"fmt"
+
+	"github.com/jesseduffield/gocui"
 )
 
 type RemoteCommands struct {
@@ -46,12 +48,12 @@ func (self *RemoteCommands) UpdateRemoteUrl(remoteName string, updatedUrl string
 	return self.cmd.New(cmdArgs).Run()
 }
 
-func (self *RemoteCommands) DeleteRemoteBranch(remoteName string, branchName string) error {
+func (self *RemoteCommands) DeleteRemoteBranch(task *gocui.Task, remoteName string, branchName string) error {
 	cmdArgs := NewGitCmd("push").
 		Arg(remoteName, "--delete", branchName).
 		ToArgv()
 
-	return self.cmd.New(cmdArgs).PromptOnCredentialRequest().WithMutex(self.syncMutex).Run()
+	return self.cmd.New(cmdArgs).PromptOnCredentialRequest(task).WithMutex(self.syncMutex).Run()
 }
 
 // CheckRemoteBranchExists Returns remote branch

pkg/commands/git_commands/sync.go

@@ -2,6 +2,7 @@ package git_commands
 
 import (
 	"github.com/go-errors/errors"
+	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
 )
 
@@ -23,7 +24,7 @@ type PushOpts struct {
 	SetUpstream    bool
 }
 
-func (self *SyncCommands) PushCmdObj(opts PushOpts) (oscommands.ICmdObj, error) {
+func (self *SyncCommands) PushCmdObj(task *gocui.Task, opts PushOpts) (oscommands.ICmdObj, error) {
 	if opts.UpstreamBranch != "" && opts.UpstreamRemote == "" {
 		return nil, errors.New(self.Tr.MustSpecifyOriginError)
 	}
@@ -35,41 +36,37 @@ func (self *SyncCommands) PushCmdObj(opts PushOpts) (oscommands.ICmdObj, error)
 		ArgIf(opts.UpstreamBranch != "", opts.UpstreamBranch).
 		ToArgv()
 
-	cmdObj := self.cmd.New(cmdArgs).PromptOnCredentialRequest().WithMutex(self.syncMutex)
+	cmdObj := self.cmd.New(cmdArgs).PromptOnCredentialRequest(task).WithMutex(self.syncMutex)
 	return cmdObj, nil
 }
 
-func (self *SyncCommands) Push(opts PushOpts) error {
-	cmdObj, err := self.PushCmdObj(opts)
+func (self *SyncCommands) Push(task *gocui.Task, opts PushOpts) error {
+	cmdObj, err := self.PushCmdObj(task, opts)
 	if err != nil {
 		return err
 	}
 
 	return cmdObj.Run()
 }
 
-type FetchOptions struct {
-	Background bool
-}
-
-// Fetch fetch git repo
-func (self *SyncCommands) FetchCmdObj(opts FetchOptions) oscommands.ICmdObj {
+func (self *SyncCommands) Fetch(task *gocui.Task) error {
 	cmdArgs := NewGitCmd("fetch").
 		ArgIf(self.UserConfig.Git.FetchAll, "--all").
 		ToArgv()
 
 	cmdObj := self.cmd.New(cmdArgs)
-	if opts.Background {
-		cmdObj.DontLog().FailOnCredentialRequest()
-	} else {
-		cmdObj.PromptOnCredentialRequest()
-	}
-	return cmdObj.WithMutex(self.syncMutex)
+	cmdObj.PromptOnCredentialRequest(task)
+	return cmdObj.WithMutex(self.syncMutex).Run()
 }
 
-func (self *SyncCommands) Fetch(opts FetchOptions) error {
-	cmdObj := self.FetchCmdObj(opts)
-	return cmdObj.Run()
+func (self *SyncCommands) FetchBackground() error {
+	cmdArgs := NewGitCmd("fetch").
+		ArgIf(self.UserConfig.Git.FetchAll, "--all").
+		ToArgv()
+
+	cmdObj := self.cmd.New(cmdArgs)
+	cmdObj.DontLog().FailOnCredentialRequest()
+	return cmdObj.WithMutex(self.syncMutex).Run()
 }
 
 type PullOptions struct {
@@ -78,7 +75,7 @@ type PullOptions struct {
 	FastForwardOnly bool
 }
 
-func (self *SyncCommands) Pull(opts PullOptions) error {
+func (self *SyncCommands) Pull(task *gocui.Task, opts PullOptions) error {
 	cmdArgs := NewGitCmd("pull").
 		Arg("--no-edit").
 		ArgIf(opts.FastForwardOnly, "--ff-only").
@@ -88,22 +85,22 @@ func (self *SyncCommands) Pull(opts PullOptions) error {
 
 	// setting GIT_SEQUENCE_EDITOR to ':' as a way of skipping it, in case the user
 	// has 'pull.rebase = interactive' configured.
-	return self.cmd.New(cmdArgs).AddEnvVars("GIT_SEQUENCE_EDITOR=:").PromptOnCredentialRequest().WithMutex(self.syncMutex).Run()
+	return self.cmd.New(cmdArgs).AddEnvVars("GIT_SEQUENCE_EDITOR=:").PromptOnCredentialRequest(task).WithMutex(self.syncMutex).Run()
 }
 
-func (self *SyncCommands) FastForward(branchName string, remoteName string, remoteBranchName string) error {
+func (self *SyncCommands) FastForward(task *gocui.Task, branchName string, remoteName string, remoteBranchName string) error {
 	cmdArgs := NewGitCmd("fetch").
 		Arg(remoteName).
 		Arg(remoteBranchName + ":" + branchName).
 		ToArgv()
 
-	return self.cmd.New(cmdArgs).PromptOnCredentialRequest().WithMutex(self.syncMutex).Run()
+	return self.cmd.New(cmdArgs).PromptOnCredentialRequest(task).WithMutex(self.syncMutex).Run()
 }
 
-func (self *SyncCommands) FetchRemote(remoteName string) error {
+func (self *SyncCommands) FetchRemote(task *gocui.Task, remoteName string) error {
 	cmdArgs := NewGitCmd("fetch").
 		Arg(remoteName).
 		ToArgv()
 
-	return self.cmd.New(cmdArgs).PromptOnCredentialRequest().WithMutex(self.syncMutex).Run()
+	return self.cmd.New(cmdArgs).PromptOnCredentialRequest(task).WithMutex(self.syncMutex).Run()
 }

pkg/commands/git_commands/tag.go

@@ -1,5 +1,7 @@
 package git_commands
 
+import "github.com/jesseduffield/gocui"
+
 type TagCommands struct {
 	*GitCommon
 }
@@ -34,9 +36,9 @@ func (self *TagCommands) Delete(tagName string) error {
 	return self.cmd.New(cmdArgs).Run()
 }
 
-func (self *TagCommands) Push(remoteName string, tagName string) error {
+func (self *TagCommands) Push(task *gocui.Task, remoteName string, tagName string) error {
 	cmdArgs := NewGitCmd("push").Arg(remoteName, "tag", tagName).
 		ToArgv()
 
-	return self.cmd.New(cmdArgs).PromptOnCredentialRequest().WithMutex(self.syncMutex).Run()
+	return self.cmd.New(cmdArgs).PromptOnCredentialRequest(task).WithMutex(self.syncMutex).Run()
 }

pkg/commands/oscommands/cmd_obj.go

@@ -4,6 +4,7 @@ import (
 	"os/exec"
 	"strings"
 
+	"github.com/jesseduffield/gocui"
 	"github.com/samber/lo"
 	"github.com/sasha-s/go-deadlock"
 )
@@ -56,13 +57,14 @@ type ICmdObj interface {
 	// returns true if IgnoreEmptyError() was called
 	ShouldIgnoreEmptyError() bool
 
-	PromptOnCredentialRequest() ICmdObj
+	PromptOnCredentialRequest(task *gocui.Task) ICmdObj
 	FailOnCredentialRequest() ICmdObj
 
 	WithMutex(mutex *deadlock.Mutex) ICmdObj
 	Mutex() *deadlock.Mutex
 
 	GetCredentialStrategy() CredentialStrategy
+	GetTask() *gocui.Task
 }
 
 type CmdObj struct {
@@ -85,6 +87,7 @@ type CmdObj struct {
 
 	// if set to true, it means we might be asked to enter a username/password by this command.
 	credentialStrategy CredentialStrategy
+	task               *gocui.Task
 
 	// can be set so that we don't run certain commands simultaneously
 	mutex *deadlock.Mutex
@@ -192,8 +195,9 @@ func (self *CmdObj) RunAndProcessLines(onLine func(line string) (bool, error)) e
 	return self.runner.RunAndProcessLines(self, onLine)
 }
 
-func (self *CmdObj) PromptOnCredentialRequest() ICmdObj {
+func (self *CmdObj) PromptOnCredentialRequest(task *gocui.Task) ICmdObj {
 	self.credentialStrategy = PROMPT
+	self.task = task
 
 	return self
 }
@@ -207,3 +211,7 @@ func (self *CmdObj) FailOnCredentialRequest() ICmdObj {
 func (self *CmdObj) GetCredentialStrategy() CredentialStrategy {
 	return self.credentialStrategy
 }
+
+func (self *CmdObj) GetTask() *gocui.Task {
+	return self.task
+}

pkg/commands/oscommands/cmd_obj_runner.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"github.com/go-errors/errors"
+	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/utils"
 	"github.com/sirupsen/logrus"
 )
@@ -308,7 +309,7 @@ func (self *cmdObjRunner) runAndDetectCredentialRequest(
 		tr := io.TeeReader(handler.stdoutPipe, cmdWriter)
 
 		go utils.Safe(func() {
-			self.processOutput(tr, handler.stdinPipe, promptUserForCredential)
+			self.processOutput(tr, handler.stdinPipe, promptUserForCredential, cmdObj.GetTask())
 		})
 	})
 }
@@ -317,6 +318,7 @@ func (self *cmdObjRunner) processOutput(
 	reader io.Reader,
 	writer io.Writer,
 	promptUserForCredential func(CredentialType) <-chan string,
+	task *gocui.Task,
 ) {
 	checkForCredentialRequest := self.getCheckForCredentialRequestFunc()
 
@@ -327,13 +329,9 @@ func (self *cmdObjRunner) processOutput(
 		askFor, ok := checkForCredentialRequest(newBytes)
 		if ok {
 			responseChan := promptUserForCredential(askFor)
-			// We assume that the busy count is greater than zero here because we're
-			// in the middle of a command. We decrement it so that The user can be prompted
-			// without lazygit thinking it's still doing its own processing. This helps
-			// integration tests know how long to wait before typing in a response.
-			self.guiIO.DecrementBusyCount()
+			task.Pause()
 			toInput := <-responseChan
-			self.guiIO.IncrementBusyCount()
+			task.Continue()
 			// If the return data is empty we don't write anything to stdin
 			if toInput != "" {
 				_, _ = writer.Write([]byte(toInput))

pkg/commands/oscommands/gui_io.go

@@ -27,26 +27,19 @@ type guiIO struct {
 	// that a command requests it.
 	// the 'credential' arg is something like 'username' or 'password'
 	promptForCredentialFn func(credential CredentialType) <-chan string
-
-	IncrementBusyCount func()
-	DecrementBusyCount func()
 }
 
 func NewGuiIO(
 	log *logrus.Entry,
 	logCommandFn func(string, bool),
 	newCmdWriterFn func() io.Writer,
 	promptForCredentialFn func(CredentialType) <-chan string,
-	IncrementBusyCount func(),
-	DecrementBusyCount func(),
 ) *guiIO {
 	return &guiIO{
 		log:                   log,
 		logCommandFn:          logCommandFn,
 		newCmdWriterFn:        newCmdWriterFn,
 		promptForCredentialFn: promptForCredentialFn,
-		IncrementBusyCount:    IncrementBusyCount,
-		DecrementBusyCount:    DecrementBusyCount,
 	}
 }
 
@@ -58,7 +51,5 @@ func NewNullGuiIO(log *logrus.Entry) *guiIO {
 		logCommandFn:          func(string, bool) {},
 		newCmdWriterFn:        func() io.Writer { return io.Discard },
 		promptForCredentialFn: failPromptFn,
-		IncrementBusyCount:    func() {},
-		DecrementBusyCount:    func() {},
 	}
 }

pkg/gui/background.go

@@ -4,7 +4,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/jesseduffield/lazygit/pkg/commands/git_commands"
+	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
 	"github.com/jesseduffield/lazygit/pkg/utils"
 )
@@ -86,7 +86,7 @@ func (self *BackgroundRoutineMgr) goEvery(interval time.Duration, stop chan stru
 				if self.pauseBackgroundRefreshes {
 					continue
 				}
-				self.gui.c.OnWorker(func() { _ = function() })
+				self.gui.c.OnWorker(func(*gocui.Task) { _ = function() })
 			case <-stop:
 				return
 			}
@@ -95,7 +95,7 @@ func (self *BackgroundRoutineMgr) goEvery(interval time.Duration, stop chan stru
 }
 
 func (self *BackgroundRoutineMgr) backgroundFetch() (err error) {
-	err = self.gui.git.Sync.Fetch(git_commands.FetchOptions{Background: true})
+	err = self.gui.git.Sync.FetchBackground()
 
 	_ = self.gui.c.Refresh(types.RefreshOptions{Scope: []types.RefreshableView{types.BRANCHES, types.COMMITS, types.REMOTES, types.TAGS}, Mode: types.ASYNC})
 

pkg/gui/controllers/branches_controller.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/commands/git_commands"
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
 	"github.com/jesseduffield/lazygit/pkg/gui/context"
@@ -363,11 +364,12 @@ func (self *BranchesController) fastForward(branch *models.Branch) error {
 		},
 	)
 
-	return self.c.WithLoaderPanel(message, func() error {
+	return self.c.WithLoaderPanel(message, func(task *gocui.Task) error {
 		if branch == self.c.Helpers().Refs.GetCheckedOutRef() {
 			self.c.LogAction(action)
 
 			err := self.c.Git().Sync.Pull(
+				task,
 				git_commands.PullOptions{
 					RemoteName:      branch.UpstreamRemote,
 					BranchName:      branch.UpstreamBranch,
@@ -381,7 +383,7 @@ func (self *BranchesController) fastForward(branch *models.Branch) error {
 			return self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
 		} else {
 			self.c.LogAction(action)
-			err := self.c.Git().Sync.FastForward(branch.Name, branch.UpstreamRemote, branch.UpstreamBranch)
+			err := self.c.Git().Sync.FastForward(task, branch.Name, branch.UpstreamRemote, branch.UpstreamBranch)
 			if err != nil {
 				_ = self.c.Error(err)
 			}

pkg/gui/controllers/commits_files_controller.go

@@ -177,7 +177,7 @@ func (self *CommitFilesController) discard(node *filetree.CommitFileNode) error
 		Title:  self.c.Tr.DiscardFileChangesTitle,
 		Prompt: prompt,
 		HandleConfirm: func() error {
-			return self.c.WithWaitingStatus(self.c.Tr.RebasingStatus, func() error {
+			return self.c.WithWaitingStatus(self.c.Tr.RebasingStatus, func(*gocui.Task) error {
 				self.c.LogAction(self.c.Tr.Actions.DiscardOldFileChange)
 				if err := self.c.Git().Rebase.DiscardOldFileChanges(self.c.Model().Commits, self.c.Contexts().LocalCommits.GetSelectedLineIdx(), node.GetPath()); err != nil {
 					if err := self.c.Helpers().MergeAndRebase.CheckMergeOrRebase(err); err != nil {
@@ -205,7 +205,7 @@ func (self *CommitFilesController) edit(node *filetree.CommitFileNode) error {
 
 func (self *CommitFilesController) toggleForPatch(node *filetree.CommitFileNode) error {
 	toggle := func() error {
-		return self.c.WithWaitingStatus(self.c.Tr.UpdatingPatch, func() error {
+		return self.c.WithWaitingStatus(self.c.Tr.UpdatingPatch, func(*gocui.Task) error {
 			if !self.c.Git().Patch.PatchBuilder.Active() {
 				if err := self.startPatchBuilder(); err != nil {
 					return err