do error checking

calc.go

@@ -121,28 +121,20 @@ func (c *Calc) GetCompleteCustomFuncalls() func(string) []string {
 		}
 
 		for command := range c.SettingsCommands {
-			if len(command) > 1 {
 			completions = append(completions, command)
 		}
-		}
 
 		for command := range c.ShowCommands {
-			if len(command) > 1 {
 			completions = append(completions, command)
 		}
-		}
 
 		for command := range c.StackCommands {
-			if len(command) > 1 {
 			completions = append(completions, command)
 		}
-		}
 
 		for command := range c.Commands {
-			if len(command) > 1 {
 			completions = append(completions, command)
 		}
-		}
 
 		return completions
 	}

command.go

@@ -305,15 +305,6 @@ func (c *Calc) SetCommands() {
 
 	// aliases
 	c.Commands["quit"] = c.Commands["exit"]
-
-	c.SettingsCommands["d"] = c.SettingsCommands["debug"]
-	c.SettingsCommands["b"] = c.SettingsCommands["batch"]
-	c.SettingsCommands["s"] = c.SettingsCommands["showstack"]
-
-	c.ShowCommands["h"] = c.ShowCommands["history"]
-	c.ShowCommands["p"] = c.ShowCommands["dump"]
-	c.ShowCommands["v"] = c.ShowCommands["vars"]
-
-	c.StackCommands["c"] = c.StackCommands["clear"]
-	c.StackCommands["u"] = c.StackCommands["undo"]
+	c.SettingsCommands["undebug"] = c.SettingsCommands["nodebug"]
+	c.SettingsCommands["show"] = c.SettingsCommands["showstack"]
 }

rpn.go

@@ -178,27 +178,17 @@ DESCRIPTION
         [no]debug            toggle debug output (nodebug turns it off)
         [no]showstack        show the last 5 items of the stack (noshowtack turns it off)
 
-    Show commands:
+    Show commands: dump display the stack contents hex show last stack item
+    in hex form (converted to int) history display calculation history vars
+    show list of variables
 
-        dump                 display the stack contents
-        hex                  show last stack item in hex form (converted to int)
-        history              display calculation history
-        vars                 show list of variables
+    Stack manipulation commands: clear clear the whole stack shift remove
+    the last element of the stack reverse reverse the stack elements swap
+    exchange the last two stack elements dup duplicate last stack item undo
+    undo last operation edit edit the stack interactively using vi or
+    $EDITOR
 
-    Stack manipulation commands:
-
-        clear                clear the whole stack
-        shift                remove the last element of the stack
-        reverse              reverse the stack elements
-        swap                 exchange the last two stack elements
-        dup                  duplicate last stack item
-        undo                 undo last operation
-        edit                 edit the stack interactively using vi or $EDITOR
-
-    Other commands:
-
-        help|?               show this message
-        manual               show manual
+    Other commands: help|? show this message manual show manual
     quit|exit|c-d|c-c exit program
 
     Register variables:
@@ -208,17 +198,6 @@ DESCRIPTION
 
     Refer to https://pkg.go.dev/math for details about those functions.
 
-    There are also a number of shortcuts for some commands available:
-
-        d    debug
-        b    batch
-        s    showstack
-        h    history
-        p    dump (aka print)
-        v    vars
-        c    clear
-        u    undo
-
 INTERACTIVE REPL
     While you can use rpn in the command-line, the best experience you'll
     have is the interactive repl (read eval print loop). Just execute "rpn"

rpn.pod

@@ -186,14 +186,12 @@ Configuration Commands:
     [no]showstack        show the last 5 items of the stack (noshowtack turns it off)
 
 Show commands:
-
     dump                 display the stack contents
     hex                  show last stack item in hex form (converted to int)
     history              display calculation history
     vars                 show list of variables
 
 Stack manipulation commands:
-
     clear                clear the whole stack
     shift                remove the last element of the stack
     reverse              reverse the stack elements
@@ -203,7 +201,6 @@ Stack manipulation commands:
     edit                 edit the stack interactively using vi or $EDITOR
 
 Other commands:
-
     help|?               show this message
     manual               show manual
     quit|exit|c-d|c-c    exit program
@@ -216,17 +213,6 @@ Register variables:
 
 Refer to https://pkg.go.dev/math for details about those functions.
 
-There are also a number of shortcuts for some commands available:
-
-    d    debug
-    b    batch
-    s    showstack
-    h    history
-    p    dump (aka print)
-    v    vars
-    c    clear
-    u    undo
-
 =head1 INTERACTIVE REPL
 
 While you can use rpn in the command-line, the best experience you'll