Store commit.Action as an enum instead of a string

The main reason for doing this (besides the reasons given for Status in the
previous commit) is that it allows us to easily convert from TodoCommand to
Action and back. This will be needed later in the branch. Fortunately,
TodoCommand is one-based, so this allows us to add an ActionNone constant with
the value 0.

pkg/commands/models/commit.go

@@ -3,6 +3,7 @@ package models
 import (
 	"fmt"
 
+	"github.com/fsmiamoto/git-todo-parser/todo"
 	"github.com/jesseduffield/lazygit/pkg/utils"
 )
 
@@ -21,12 +22,18 @@ const (
 	StatusReflog
 )
 
+const (
+	// Conveniently for us, the todo package starts the enum at 1, and given
+	// that it doesn't have a "none" value, we're setting ours to 0
+	ActionNone todo.TodoCommand = 0
+)
+
 // Commit : A git commit
 type Commit struct {
 	Sha           string
 	Name          string
 	Status        CommitStatus
-	Action        string // one of "", "pick", "edit", "squash", "reword", "drop", "fixup"
+	Action        todo.TodoCommand
 	Tags          []string
 	ExtraInfo     string // something like 'HEAD -> master, tag: v0.15.2'
 	AuthorName    string // something like 'Jesse Duffield'
@@ -75,7 +82,7 @@ func (c *Commit) IsMerge() bool {
 // returns true if this commit is not actually in the git log but instead
 // is from a TODO file for an interactive rebase.
 func (c *Commit) IsTODO() bool {
-	return c.Action != ""
+	return c.Action != ActionNone
 }
 
 func IsHeadCommit(commits []*Commit, index int) bool {