Add author filtering to commit view

This commit introduces a new feature to the commit view, allowing users
to filter commits based on the author's name or email address. Similar
to the existing path filtering functionality, accessible through <c-s>,
this feature allows users to filter the commit history by the currently
selected commit's author if the commit view is focused, or by typing in
the author's name or email address.

This feature adds an entry to the filtering menu, to provide users with
a familiar and intuitive experience

pkg/integration/tests/filter_by_author/select_author.go

@@ -0,0 +1,70 @@
+package filter_by_author
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var SelectAuthor = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Filter commits using the currently highlighted commit's author when the commit view is active",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(config *config.AppConfig) {
+		config.AppState.GitLogShowGraph = "never"
+	},
+	SetupRepo: func(shell *Shell) {
+		commonSetup(shell)
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			SelectedLineIdx(0).
+			Press(keys.Universal.FilteringMenu)
+
+		t.ExpectPopup().Menu().
+			Title(Equals("Filtering")).
+			Select(Contains("Filter by 'Paul Oberstein <paul.oberstein@email.com>'")).
+			Confirm()
+
+		t.Views().Commits().
+			IsFocused().
+			Lines(
+				Contains("commit 7"),
+				Contains("commit 6"),
+				Contains("commit 5"),
+				Contains("commit 4"),
+				Contains("commit 3"),
+				Contains("commit 2"),
+				Contains("commit 1"),
+				Contains("commit 0"),
+			)
+
+		t.Views().Information().Content(Contains("Filtering by 'Paul Oberstein <paul.oberstein@email.com>'"))
+
+		t.Views().Commits().
+			Press(keys.Universal.FilteringMenu)
+
+		t.ExpectPopup().Menu().
+			Title(Equals("Filtering")).
+			Select(Contains("Stop filtering")).
+			Confirm()
+
+		t.Views().Commits().
+			IsFocused().
+			NavigateToLine(Contains("SK commit 0")).
+			Press(keys.Universal.FilteringMenu)
+
+		t.ExpectPopup().Menu().
+			Title(Equals("Filtering")).
+			Select(Contains("Filter by 'Siegfried Kircheis <siegfried.kircheis@email.com>'")).
+			Confirm()
+
+		t.Views().Commits().
+			IsFocused().
+			Lines(
+				Contains("commit 0"),
+			)
+
+		t.Views().Information().Content(Contains("Filtering by 'Siegfried Kircheis <siegfried.kircheis@email.com>'"))
+	},
+})

pkg/integration/tests/filter_by_author/shared.go

@@ -0,0 +1,30 @@
+package filter_by_author
+
+import (
+	"fmt"
+	"strings"
+
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+type AuthorInfo struct {
+	name            string
+	numberOfCommits int
+}
+
+func commonSetup(shell *Shell) {
+	authors := []AuthorInfo{{"Yang Wen-li", 3}, {"Siegfried Kircheis", 1}, {"Paul Oberstein", 8}}
+	totalCommits := 0
+	repoStartDaysAgo := 100
+
+	for _, authorInfo := range authors {
+		for i := 0; i < authorInfo.numberOfCommits; i++ {
+			authorEmail := strings.ToLower(strings.ReplaceAll(authorInfo.name, " ", ".")) + "@email.com"
+			commitMessage := fmt.Sprintf("commit %d", i)
+
+			shell.SetAuthor(authorInfo.name, authorEmail)
+			shell.EmptyCommitDaysAgo(commitMessage, repoStartDaysAgo-totalCommits)
+			totalCommits++
+		}
+	}
+}

pkg/integration/tests/filter_by_author/type_author.go

@@ -0,0 +1,66 @@
+package filter_by_author
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var TypeAuthor = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Filter commits by author using the typed in author",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(config *config.AppConfig) {
+	},
+	SetupRepo: func(shell *Shell) {
+		commonSetup(shell)
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Status().
+			Focus().
+			Press(keys.Universal.FilteringMenu)
+
+		t.ExpectPopup().Menu().
+			Title(Equals("Filtering")).
+			Select(Contains("Enter author to filter by")).
+			Confirm()
+
+		t.ExpectPopup().Prompt().
+			Title(Equals("Enter author:")).
+			Type("Yang").
+			SuggestionLines(Equals("Yang Wen-li <yang.wen-li@email.com>")).
+			ConfirmFirstSuggestion()
+
+		t.Views().Commits().
+			IsFocused().
+			Lines(
+				Contains("commit 2"),
+				Contains("commit 1"),
+				Contains("commit 0"),
+			)
+
+		t.Views().Information().Content(Contains("Filtering by 'Yang Wen-li <yang.wen-li@email.com>'"))
+
+		t.Views().Status().
+			Focus().
+			Press(keys.Universal.FilteringMenu)
+
+		t.ExpectPopup().Menu().
+			Title(Equals("Filtering")).
+			Select(Contains("Enter author to filter by")).
+			Confirm()
+
+		t.ExpectPopup().Prompt().
+			Title(Equals("Enter author:")).
+			Type("Siegfried").
+			SuggestionLines(Equals("Siegfried Kircheis <siegfried.kircheis@email.com>")).
+			ConfirmFirstSuggestion()
+
+		t.Views().Commits().
+			IsFocused().
+			Lines(
+				Contains("commit 0"),
+			)
+
+		t.Views().Information().Content(Contains("Filtering by 'Siegfried Kircheis <siegfried.kircheis@email.com>'"))
+	},
+})

pkg/integration/tests/test_list.go

@@ -15,6 +15,7 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/integration/tests/diff"
 	"github.com/jesseduffield/lazygit/pkg/integration/tests/file"
 	"github.com/jesseduffield/lazygit/pkg/integration/tests/filter_and_search"
+	"github.com/jesseduffield/lazygit/pkg/integration/tests/filter_by_author"
 	"github.com/jesseduffield/lazygit/pkg/integration/tests/filter_by_path"
 	"github.com/jesseduffield/lazygit/pkg/integration/tests/interactive_rebase"
 	"github.com/jesseduffield/lazygit/pkg/integration/tests/misc"
@@ -149,6 +150,8 @@ var tests = []*components.IntegrationTest{
 	filter_and_search.NestedFilter,
 	filter_and_search.NestedFilterTransient,
 	filter_and_search.NewSearch,
+	filter_by_author.SelectAuthor,
+	filter_by_author.TypeAuthor,
 	filter_by_path.CliArg,
 	filter_by_path.SelectFile,
 	filter_by_path.TypeFile,