✨ Add configuration to set sign-off

Allow setting the default state for sign-off of commits.

Identified a problem with reseting the footer model which was not
changing the signoff to the default value. By fixing this issue, there
is no need to use the toggle signoff method within the footer model.

README.md

@@ -124,6 +124,12 @@ view:
   # Default: below
   emojiSelector: below
 
+commit:
+  # Enable author sign-off for commits.
+  # Values: true, false
+  # Default: false
+  signoff: false
+
 authors:
   # List of extra authors.
   - name: John Doe

internal/ui/footer/footer.go

@@ -16,12 +16,14 @@ type Model struct {
 }
 
 func New(state *commit.State) Model {
-	if len(state.Repository.Users) == 0 {
-		state.Repository.Users = []repository.User{{}}
+	authors := concatSlice(state.Repository.Users, state.Config.Authors)
+
+	if len(authors) == 0 {
+		authors = []repository.User{{}}
 	}
 
 	return Model{
-		Author: state.Repository.Users[0],
+		Author: authors[0],
 	}
 }
 
@@ -68,3 +70,8 @@ func (m Model) signoff() string {
 func ToModel(m tea.Model, c tea.Cmd) (Model, tea.Cmd) {
 	return m.(Model), c
 }
+
+func concatSlice[T any](first []T, second []T) []T {
+	n := len(first)
+	return append(first[:n:n], second...)
+}

internal/ui/testdata/config_signoff_off.golden

@@ -0,0 +1,32 @@
+commit 1 (HEAD -> master)
+author: John Doe <[email protected]>
+date:   Sat Jan 1 01:00:00 2022 +0000
+
+    ┌────┐ ┌─────────────────────────────────────────────────────────────┐
+    │    │ │ placeholder                                                 │  0/50
+    └────┘ └─────────────────────────────────────────────────────────────┘
+
+    ┌──────────────────────────────────────────────────────────────────────────┐
+    │? Choose an emoji:                                                      ● │
+    │❯ 🎨 - Improve structure / format of the code.                            │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    └──────────────────────────────────────────────────────────────────────────┘
+
+    ┌──────────────────────────────────────────────────────────────────────────┐
+    │ placeholder                                                              │
+    │  ~                                                                       │
+    │  ~                                                                       │
+    │  ~                                                                       │
+    │  ~                                                                       │
+    │  ~                                                                       │
+    └──────────────────────────────────────────────────────────────────────────┘
+
+ Alt + <enter> Commit <s> Sign-off </> Help                Summary <tab>
+Ctrl +     <c> Cancel                                       Author <tab> + Shift

internal/ui/testdata/config_signoff_on.golden

@@ -0,0 +1,32 @@
+commit 1 (HEAD -> master)
+author: John Doe <[email protected]>
+date:   Sat Jan 1 01:00:00 2022 +0000
+
+    ┌────┐ ┌─────────────────────────────────────────────────────────────┐
+    │    │ │ placeholder                                                 │  0/50
+    └────┘ └─────────────────────────────────────────────────────────────┘
+
+    ┌──────────────────────────────────────────────────────────────────────────┐
+    │? Choose an emoji:                                                      ● │
+    │❯ 🎨 - Improve structure / format of the code.                            │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    │                                                                          │
+    └──────────────────────────────────────────────────────────────────────────┘
+
+    ┌──────────────────────────────────────────────────────────────────────────┐
+    │ placeholder                                                              │
+    │  ~                                                                       │
+    │  ~                                                                       │
+    │  ~                                                                       │
+    └──────────────────────────────────────────────────────────────────────────┘
+
+      Signed-off-by: John Doe <[email protected]>
+
+ Alt + <enter> Commit <s> Sign-off </> Help                Summary <tab>
+Ctrl +     <c> Cancel                                       Author <tab> + Shift

internal/ui/ui.go

@@ -88,6 +88,7 @@ func (m *Model) Configure(state *commit.State) {
 	}
 
 	m.defaultFocus(state.Config)
+	m.signoff = state.Config.Commit.Signoff
 }
 
 func (m Model) Start() (*commit.Request, error) {
@@ -227,7 +228,6 @@ func (m Model) onKeyPress(msg tea.KeyMsg) keyResponse {
 		return keyResponse{model: m, cmd: tea.Quit, end: true}
 	case "alt+s":
 		m.signoff = !m.signoff
-		m.models.footer.ToggleSignoff()
 
 		return keyResponse{model: m, end: false, nilMsg: true}
 	case "alt+t":
@@ -276,6 +276,7 @@ func (m Model) resetModels() Model {
 	m.models.body.Blur()
 	m.models.body.Height = bodyDefaultHeight
 	m.models.footer.Author = m.models.info.Author
+	m.models.footer.Signoff = m.signoff
 	m.models.help.Blur()
 
 	return m

internal/ui/ui_test.go

@@ -529,6 +529,30 @@ func TestModel(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "config_signoff_off",
+			args: args{
+				state: func(s *commit.State) {
+					s.Config.Commit.Signoff = false
+				},
+				model: func(m ui.Model) ui.Model {
+					m, _ = ToModel(m.Update(nil))
+					return m
+				},
+			},
+		},
+		{
+			name: "config_signoff_on",
+			args: args{
+				state: func(s *commit.State) {
+					s.Config.Commit.Signoff = true
+				},
+				model: func(m ui.Model) ui.Model {
+					m, _ = ToModel(m.Update(nil))
+					return m
+				},
+			},
+		},
 	}
 
 	for _, tt := range tests {