Add property outputTitle to CustomCommand

It can optionally be used to set the title of the panel that shows the output of
a command (when showOutput is true). If left unset, the command string is used
as the title.

pkg/integration/tests/custom_commands/show_output_in_panel.go

@@ -0,0 +1,57 @@
+package custom_commands
+
+import (
+	"fmt"
+
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var ShowOutputInPanel = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Run a command and show the output in a panel",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("my change")
+	},
+	SetupConfig: func(cfg *config.AppConfig) {
+		cfg.UserConfig.CustomCommands = []config.CustomCommand{
+			{
+				Key:        "X",
+				Context:    "commits",
+				Command:    "printf '%s' '{{ .SelectedLocalCommit.Name }}'",
+				ShowOutput: true,
+			},
+			{
+				Key:         "Y",
+				Context:     "commits",
+				Command:     "printf '%s' '{{ .SelectedLocalCommit.Name }}'",
+				ShowOutput:  true,
+				OutputTitle: "Subject of commit {{ .SelectedLocalCommit.Hash }}",
+			},
+		}
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Lines(
+				Contains("my change").IsSelected(),
+			).
+			Press("X")
+
+		t.ExpectPopup().Alert().
+			// Uses cmd string as title if no outputTitle is provided
+			Title(Equals("printf '%s' 'my change'")).
+			Content(Equals("my change")).
+			Confirm()
+
+		t.Views().Commits().
+			Press("Y")
+
+		hash := t.Git().GetCommitHash("HEAD")
+		t.ExpectPopup().Alert().
+			// Uses provided outputTitle with template fields resolved
+			Title(Equals(fmt.Sprintf("Subject of commit %s", hash))).
+			Content(Equals("my change"))
+	},
+})