Issue 23: Added progress indicators and cancellation (#34)

- Wrapped all table operations in a new foreground job context, which mediates foreground tasks.
- Added cancellation support and partial results for table read operations.
- Added the "mark" command, which can mark, unmark & toggle marked items
- Added support for alias arguments.
- Removed the "unmark" command, and replaced it as an alias to the "marked" command
- Fixed seg faults raised when there is no table shown in the result set.

internal/common/ui/commandctrl/commandctrl.go

@@ -57,14 +57,20 @@ func (c *CommandController) execute(ctx ExecContext, commandInput string) tea.Ms
 	return command(ctx, tokens[1:])
 }
 
-func (c *CommandController) Alias(commandName string) Command {
+func (c *CommandController) Alias(commandName string, aliasArgs []string) Command {
 	return func(ctx ExecContext, args []string) tea.Msg {
 		command := c.lookupCommand(commandName)
 		if command == nil {
 			return events.Error(errors.New("no such command: " + commandName))
 		}
 
-		return command(ctx, args)
+		var allArgs []string
+		if len(aliasArgs) > 0 {
+			allArgs = append(append([]string{}, aliasArgs...), args...)
+		} else {
+			allArgs = args
+		}
+		return command(ctx, allArgs)
 	}
 }
 

internal/common/ui/events/commands.go

@@ -29,7 +29,13 @@ func PromptForInput(prompt string, onDone func(value string) tea.Msg) tea.Msg {
 	}
 }
 
-func Confirm(prompt string, onYes func() tea.Msg) tea.Msg {
+func Confirm(prompt string, onResult func(yes bool) tea.Msg) tea.Msg {
+	return PromptForInput(prompt, func(value string) tea.Msg {
+		return onResult(value == "y")
+	})
+}
+
+func ConfirmYes(prompt string, onYes func() tea.Msg) tea.Msg {
 	return PromptForInput(prompt, func(value string) tea.Msg {
 		if value == "y" {
 			return onYes()

internal/common/ui/events/jobs.go

@@ -0,0 +1,6 @@
+package events
+
+type ForegroundJobUpdate struct {
+	JobRunning bool
+	JobStatus  string
+}