do error checking

Makefile

@@ -51,17 +51,14 @@ install: buildlocal
 	install -o $(UID) -g $(GID) -m 444 $(tool).1 $(PREFIX)/man/man1/
 
 clean:
-	rm -rf $(tool) coverage.out testdata
+	rm -rf $(tool) coverage.out
 
-test: clean
-	go test ./... $(ARGS)
-
-testfuzzy: clean
-	go test -fuzz ./... $(ARGS)
+test:
+	go test -v ./...
 
 singletest:
-	@echo "Call like this: make singletest TEST=TestPrepareColumns ARGS=-v"
-	go test -run $(TEST) $(ARGS)
+	@echo "Call like this: ''make singletest TEST=TestPrepareColumns"
+	go test -run $(TEST)
 
 cover-report:
 	go test ./... -cover -coverprofile=coverage.out

calc.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2023-2024 Thomas von Dein
+Copyright © 2023 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -20,7 +20,6 @@ package main
 import (
 	"errors"
 	"fmt"
-	"math"
 	"regexp"
 	"sort"
 	"strconv"
@@ -36,8 +35,6 @@ type Calc struct {
 	showstack    bool
 	intermediate bool
 	notdone      bool // set to true as long as there are items left in the eval loop
-	precision    int
-
 	stack        *Stack
 	history      []string
 	completer    readline.AutoCompleter
@@ -94,7 +91,6 @@ Register variables:
 const (
 	//Commands  string = `dump reverse clear shift undo help history manual exit quit swap debug undebug nodebug batch nobatch showstack noshowstack vars`
 	Constants string = `Pi Phi Sqrt2 SqrtE SqrtPi SqrtPhi Ln2 Log2E Ln10 Log10E`
-	Precision int    = 2
 )
 
 // That way we can add custom functions to completion
@@ -125,28 +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
 	}
@@ -154,7 +142,7 @@ func (c *Calc) GetCompleteCustomFuncalls() func(string) []string {
 }
 
 func NewCalc() *Calc {
-	c := Calc{stack: NewStack(), debug: false, precision: Precision}
+	c := Calc{stack: NewStack(), debug: false}
 
 	c.Funcalls = DefineFunctions()
 	c.BatchFuncalls = DefineBatchFunctions()
@@ -226,12 +214,12 @@ func (c *Calc) Prompt() string {
 }
 
 // the actual work horse, evaluate a line of calc command[s]
-func (c *Calc) Eval(line string) error {
+func (c *Calc) Eval(line string) {
 	// remove surrounding whitespace and comments, if any
 	line = strings.TrimSpace(c.Comment.ReplaceAllString(line, ""))
 
 	if line == "" {
-		return nil
+		return
 	}
 
 	items := c.Space.Split(line, -1)
@@ -243,25 +231,6 @@ func (c *Calc) Eval(line string) error {
 			c.notdone = false
 		}
 
-		if err := c.EvalItem(item); err != nil {
-			return err
-		}
-	}
-
-	if c.showstack && !c.stdin {
-		dots := ""
-
-		if c.stack.Len() > 5 {
-			dots = "... "
-		}
-		last := c.stack.Last(5)
-		fmt.Printf("stack: %s%s\n", dots, list2str(last))
-	}
-
-	return nil
-}
-
-func (c *Calc) EvalItem(item string) error {
 		num, err := strconv.ParseFloat(item, 64)
 
 		if err == nil {
@@ -274,42 +243,45 @@ func (c *Calc) EvalItem(item string) error {
 			if err == nil {
 				c.stack.Backup()
 				c.stack.Push(float64(i))
-			return nil
+				continue
 			}
 
 			if contains(c.Constants, item) {
 				// put the constant onto the stack
 				c.stack.Backup()
 				c.stack.Push(const2num(item))
-			return nil
+				continue
 			}
 
-		if exists(c.Funcalls, item) {
+			if _, ok := c.Funcalls[item]; ok {
 				if err := c.DoFuncall(item); err != nil {
-				return Error(err.Error())
+					fmt.Println(err)
 				} else {
 					c.Result()
 				}
-			return nil
-		}
-
-		if exists(c.BatchFuncalls, item) {
-			if !c.batch {
-				return Error("only supported in batch mode")
+				continue
 			}
 
+			if c.batch {
+				if _, ok := c.BatchFuncalls[item]; ok {
 					if err := c.DoFuncall(item); err != nil {
-				return Error(err.Error())
+						fmt.Println(err)
 					} else {
 						c.Result()
 					}
-			return nil
+					continue
+				}
+			} else {
+				if _, ok := c.BatchFuncalls[item]; ok {
+					fmt.Println("only supported in batch mode")
+					continue
+				}
 			}
 
 			if contains(c.LuaFunctions, item) {
 				// user provided custom lua functions
 				c.EvalLuaFunction(item)
-			return nil
+				continue
 			}
 
 			regmatches := c.Register.FindStringSubmatch(item)
@@ -320,29 +292,28 @@ func (c *Calc) EvalItem(item string) error {
 				case "<":
 					c.GetVar(regmatches[2])
 				}
-			return nil
+				continue
 			}
 
 			// internal commands
-		// FIXME: propagate errors
-		if exists(c.Commands, item) {
+			if _, ok := c.Commands[item]; ok {
 				c.Commands[item].Func(c)
-			return nil
+				continue
 			}
 
-		if exists(c.ShowCommands, item) {
+			if _, ok := c.ShowCommands[item]; ok {
 				c.ShowCommands[item].Func(c)
-			return nil
+				continue
 			}
 
-		if exists(c.StackCommands, item) {
+			if _, ok := c.StackCommands[item]; ok {
 				c.StackCommands[item].Func(c)
-			return nil
+				continue
 			}
 
-		if exists(c.SettingsCommands, item) {
+			if _, ok := c.SettingsCommands[item]; ok {
 				c.SettingsCommands[item].Func(c)
-			return nil
+				continue
 			}
 
 			switch item {
@@ -352,11 +323,20 @@ func (c *Calc) EvalItem(item string) error {
 				c.PrintHelp()
 
 			default:
-			return Error("unknown command or operator")
+				fmt.Println("unknown command or operator!")
+			}
 		}
 	}
 
-	return nil
+	if c.showstack && !c.stdin {
+		dots := ""
+
+		if c.stack.Len() > 5 {
+			dots = "... "
+		}
+		last := c.stack.Last(5)
+		fmt.Printf("stack: %s%s\n", dots, list2str(last))
+	}
 }
 
 // Execute a math function, check if it is defined just in case
@@ -369,7 +349,7 @@ func (c *Calc) DoFuncall(funcname string) error {
 	}
 
 	if function == nil {
-		return Error("function not defined but in completion list")
+		panic("function not defined but in completion list")
 	}
 
 	var args Numbers
@@ -442,16 +422,7 @@ func (c *Calc) Result() float64 {
 			fmt.Print("= ")
 		}
 
-		result := c.stack.Last()[0]
-		truncated := math.Trunc(result)
-		precision := c.precision
-
-		if result == truncated {
-			precision = 0
-		}
-
-		format := fmt.Sprintf("%%.%df\n", precision)
-		fmt.Printf(format, result)
+		fmt.Println(c.stack.Last()[0])
 	}
 
 	return c.stack.Last()[0]
@@ -528,7 +499,7 @@ func (c *Calc) PutVar(name string) {
 }
 
 func (c *Calc) GetVar(name string) {
-	if exists(c.Vars, name) {
+	if _, ok := c.Vars[name]; ok {
 		c.Debug(fmt.Sprintf("retrieve %.2f from %s", c.Vars[name], name))
 		c.stack.Backup()
 		c.stack.Push(c.Vars[name])
@@ -541,10 +512,8 @@ func sortcommands(hash Commands) []string {
 	keys := make([]string, 0, len(hash))
 
 	for key := range hash {
-		if len(key) > 1 {
 		keys = append(keys, key)
 	}
-	}
 
 	sort.Strings(keys)
 

calc_test.go

@@ -19,8 +19,6 @@ package main
 
 import (
 	"fmt"
-	"strconv"
-	"strings"
 	"testing"
 
 	lua "github.com/yuin/gopher-lua"
@@ -77,9 +75,7 @@ func TestCommentsAndWhitespace(t *testing.T) {
 
 		t.Run(testname, func(t *testing.T) {
 			for _, line := range tt.cmd {
-				if err := calc.Eval(line); err != nil {
-					t.Errorf(err.Error())
-				}
+				calc.Eval(line)
 			}
 			got := calc.stack.Last()
 
@@ -292,9 +288,7 @@ func TestCalc(t *testing.T) {
 
 		t.Run(testname, func(t *testing.T) {
 			calc.batch = tt.batch
-			if err := calc.Eval(tt.cmd); err != nil {
-				t.Errorf(err.Error())
-			}
+			calc.Eval(tt.cmd)
 			got := calc.Result()
 			calc.stack.Clear()
 			if got != tt.exp {
@@ -356,60 +350,3 @@ func TestCalcLua(t *testing.T) {
 		})
 	}
 }
-
-func FuzzEval(f *testing.F) {
-	legal := []string{
-		"dump",
-		"showstack",
-		"help",
-		"Pi 31 *",
-		"SqrtE Pi /",
-		"55.5 yards-to-meters",
-		"2 4 +",
-		"7 8 batch sum",
-		"7 8 %-",
-		"7 8 clear",
-		"7 8 /",
-		"b",
-		"#444",
-		"<X",
-	}
-
-	for _, item := range legal {
-		f.Add(item)
-	}
-
-	calc := NewCalc()
-	var i int
-
-	f.Fuzz(func(t *testing.T, line string) {
-		t.Logf("Stack:\n%v\n", calc.stack.All())
-		if err := calc.EvalItem(line); err == nil {
-			t.Logf("given: <%s>", line)
-			// not corpus and empty?
-			if !contains(legal, line) && len(line) > 0 {
-				item := strings.TrimSpace(calc.Comment.ReplaceAllString(line, ""))
-				_, hexerr := fmt.Sscanf(item, "0x%x", &i)
-				// no comment?
-				if len(item) > 0 {
-					// no known command or function?
-					if _, err := strconv.ParseFloat(item, 64); err != nil {
-						if !contains(calc.Constants, item) &&
-							!exists(calc.Funcalls, item) &&
-							!exists(calc.BatchFuncalls, item) &&
-							!contains(calc.LuaFunctions, item) &&
-							!exists(calc.Commands, item) &&
-							!exists(calc.ShowCommands, item) &&
-							!exists(calc.SettingsCommands, item) &&
-							!exists(calc.StackCommands, item) &&
-							!calc.Register.MatchString(item) &&
-							item != "?" && item != "help" &&
-							hexerr != nil {
-							t.Errorf("Fuzzy input accepted: <%s>", line)
-						}
-					}
-				}
-			}
-		}
-	})
-}

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"]
 }

funcs.go

@@ -457,20 +457,12 @@ func DefineFunctions() Funcalls {
 
 		"<": NewFuncall(
 			func(arg Numbers) R {
-				// Shift by negative number provibited, so check it.
-				// Note that we check agains uint64 overflow as well here
-				if arg[1] < 0 || uint64(arg[1]) > math.MaxInt64 {
-					return NewR(0, errors.New("negative shift amount"))
-				}
 				return NewR(float64(int(arg[0])<<int(arg[1])), nil)
 			},
 			2),
 
 		">": NewFuncall(
 			func(arg Numbers) R {
-				if arg[1] < 0 || uint64(arg[1]) > math.MaxInt64 {
-					return NewR(0, errors.New("negative shift amount"))
-				}
 				return NewR(float64(int(arg[0])>>int(arg[1])), nil)
 			},
 			2),

go.mod

@@ -4,9 +4,7 @@ go 1.20
 
 require (
 	github.com/chzyer/readline v1.5.1 // indirect
-	github.com/rogpeppe/go-internal v1.11.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/yuin/gopher-lua v1.1.0 // indirect
-	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
-	golang.org/x/tools v0.1.12 // indirect
+	golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5 // indirect
 )

go.sum

@@ -2,15 +2,9 @@ github.com/chzyer/logex v1.2.1/go.mod h1:JLbx6lG2kDbNRFnfkgvh4eRJRPX1QCoOIWomwys
 github.com/chzyer/readline v1.5.1 h1:upd/6fQk4src78LMRzh5vItIt361/o4uq553V8B5sGI=
 github.com/chzyer/readline v1.5.1/go.mod h1:Eh+b79XXUwfKfcPLepksvw2tcLE/Ct21YObkaSkeBlk=
 github.com/chzyer/test v1.0.0/go.mod h1:2JlltgoNkt4TW/z9V/IzDdFaMTM2JPIi26O1pF38GC8=
-github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
-github.com/rogpeppe/go-internal v1.11.0/go.mod h1:ddIwULY96R17DhadqLgMfk9H9tvdUzkipdSkR5nkCZA=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/yuin/gopher-lua v1.1.0 h1:BojcDhfyDWgU2f2TOzYK/g5p2gxMrku8oupLDqlnSqE=
 github.com/yuin/gopher-lua v1.1.0/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
 golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5 h1:y/woIyUBFbpQGKS0u1aHF/40WUDnek3fPOyD08H5Vng=
 golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=

main.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2023-2024 Thomas von Dein
+Copyright © 2023 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -30,7 +30,7 @@ import (
 	lua "github.com/yuin/gopher-lua"
 )
 
-const VERSION string = "2.1.0"
+const VERSION string = "2.0.11"
 
 const Usage string = `This is rpn, a reverse polish notation calculator cli.
 
@@ -42,21 +42,15 @@ Options:
   -s, --stack         show last 5 items of the stack (off by default)
   -i  --intermediate  print intermediate results
   -m, --manual        show manual
-  -c, --config <file>   load <file> containing LUA code
-  -p, --precision <int> floating point number precision (default 2)
   -v, --version       show version
   -h, --help          show help
 
 When <operator>  is given, batch  mode ist automatically  enabled. Use
 this only when working with stdin. E.g.: echo "2 3 4 5" | rpn +
 
-Copyright (c) 2023-2024 T.v.Dein`
+Copyright (c) 2023 T.v.Dein`
 
 func main() {
-	os.Exit(Main())
-}
-
-func Main() int {
 	calc := NewCalc()
 
 	showversion := false
@@ -75,18 +69,17 @@ func Main() int {
 	flag.BoolVarP(&showmanual, "manual", "m", false, "show manual")
 	flag.StringVarP(&configfile, "config", "c",
 		os.Getenv("HOME")+"/.rpn.lua", "config file (lua format)")
-	flag.IntVarP(&calc.precision, "precision", "p", Precision, "floating point precision")
 
 	flag.Parse()
 
 	if showversion {
 		fmt.Printf("This is rpn version %s\n", VERSION)
-		return 0
+		return
 	}
 
 	if showhelp {
 		fmt.Println(Usage)
-		return 0
+		return
 	}
 
 	if enabledebug {
@@ -95,7 +88,7 @@ func Main() int {
 
 	if showmanual {
 		man()
-		return 0
+		os.Exit(0)
 	}
 
 	// the lua state object is global, instanciate it early
@@ -108,25 +101,14 @@ func Main() int {
 		luarunner := NewInterpreter(configfile, enabledebug)
 		luarunner.InitLua()
 		calc.SetInt(luarunner)
-		if calc.debug {
-			fmt.Println("loaded config")
-		}
-	} else {
-		if calc.debug {
-			fmt.Println(err)
-		}
 	}
 
 	if len(flag.Args()) > 1 {
 		// commandline calc operation, no readline etc needed
 		// called like rpn 2 2 +
 		calc.stdin = true
-		if err := calc.Eval(strings.Join(flag.Args(), " ")); err != nil {
-			fmt.Println(err)
-			return 1
-		}
-
-		return 0
+		calc.Eval(strings.Join(flag.Args(), " "))
+		return
 	}
 
 	// interactive mode, need readline
@@ -159,10 +141,7 @@ func Main() int {
 			break
 		}
 
-		err = calc.Eval(line)
-		if err != nil {
-			fmt.Println(err)
-		}
+		calc.Eval(line)
 		rl.SetPrompt(calc.Prompt())
 	}
 
@@ -171,13 +150,8 @@ func Main() int {
 		// echo 1 2 3 4 | rpn +
 		// batch mode enabled automatically
 		calc.batch = true
-		if err = calc.Eval(flag.Args()[0]); err != nil {
-			fmt.Println(err)
-			return 1
+		calc.Eval(flag.Args()[0])
 	}
-	}
-
-	return 0
 }
 
 func inputIsStdin() bool {

main_test.go

@@ -1,20 +0,0 @@
-package main
-
-import (
-	"os"
-	"testing"
-
-	"github.com/rogpeppe/go-internal/testscript"
-)
-
-func TestMain(m *testing.M) {
-	os.Exit(testscript.RunMain(m, map[string]func() int{
-		"testrpn": Main,
-	}))
-}
-
-func TestRpn(t *testing.T) {
-	testscript.Run(t, testscript.Params{
-		Dir: "t",
-	})
-}

rpn.go

@@ -13,8 +13,6 @@ SYNOPSIS
           -s, --stack         show last 5 items of the stack (off by default)
           -i  --intermediate  print intermediate results
           -m, --manual        show manual
-          -c, --config <file>   load <file> containing LUA code
-          -p, --precision <int> floating point number precision (default 2)
           -v, --version       show version
           -h, --help          show help
     
@@ -180,27 +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:
@@ -210,17 +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"
@@ -311,15 +288,6 @@ EXTENDING RPN USING LUA
     So you can't open files, execute other programs or open a connection to
     the outside!
 
-CONFIGURATION
-    rpn can be configured via command line flags (see usage above). Most of
-    the flags are also available as interactive commands, such as "--batch"
-    has the same effect as the batch command.
-
-    The floating point number precision option "-p, --precision" however is
-    not available as interactive command, it MUST be configured on the
-    command line, if needed. The default precision is 2.
-
 GETTING HELP
     In interactive mode you can enter the help command (or ?) to get a short
     help along with a list of all supported operators and functions.
@@ -339,7 +307,7 @@ LICENSE
     This software is licensed under the GNU GENERAL PUBLIC LICENSE version
     3.
 
-    Copyright (c) 2023-2024 by Thomas von Dein
+    Copyright (c) 2023 by Thomas von Dein
 
     This software uses the following GO modules:
 

rpn.pod

@@ -12,8 +12,6 @@ rpn - Programmable command-line calculator using reverse polish notation
       -s, --stack         show last 5 items of the stack (off by default)
       -i  --intermediate  print intermediate results
       -m, --manual        show manual
-      -c, --config <file>   load <file> containing LUA code
-      -p, --precision <int> floating point number precision (default 2)
       -v, --version       show version
       -h, --help          show help
     
@@ -188,14 +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
@@ -205,7 +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
@@ -218,17 +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
@@ -344,16 +328,6 @@ B<Please note, that io, networking and system stuff is not allowed
 though. So you can't open files, execute other programs or open a
 connection to the outside!>
 
-=head1 CONFIGURATION
-
-B<rpn> can be configured via command line flags (see usage
-above). Most of the flags are also available as interactive commands,
-such as C<--batch> has the same effect as the B<batch> command.
-
-The floating point number  precision option C<-p, --precision> however
-is not available as interactive command,  it MUST be configured on the
-command line, if needed. The default precision is 2.
-
 =head1 GETTING HELP
 
 In interactive mode you can enter the B<help> command (or B<?>) to get
@@ -376,7 +350,7 @@ L<https://github.com/TLINDEN/rpnc/issues>.
 
 This software is licensed under the GNU GENERAL PUBLIC LICENSE version 3.
 
-Copyright (c) 2023-2024 by Thomas von Dein
+Copyright (c) 2023 by Thomas von Dein
 
 This software uses the following GO modules:
 

t/cmdline-command.txtar

@@ -1,2 +0,0 @@
-exec testrpn 1 2 dump
-stdout 'Stack revision 2 .0x'

t/cmdline-invalidcommand.txtar

@@ -1,2 +0,0 @@
-! exec testrpn 1 2 dumb
-stdout 'unknown command or operator'

t/cmdline-precision.txtar

@@ -1,2 +0,0 @@
-exec testrpn -p 4 2 3 /
-stdout '0.6667\n'

t/cmdline-short-stack.txtar

@@ -1,2 +0,0 @@
-! exec testrpn 4 +
-stdout 'stack doesn''t provide enough arguments'

t/cmdlinecalc-debug.txtar

@@ -1,2 +0,0 @@
-exec testrpn -d 44 55 *
-stdout 'push to stack: 2420.00\n'

t/cmdlinecalc-divzero.txtar

@@ -1,2 +0,0 @@
-! exec testrpn 100 50 50 - /
-stdout 'division by null'

t/cmdlinecalc-lua.txtar

@@ -1,16 +0,0 @@
-exec testrpn -d -c test.lua 3 5 lower
-stdout '3\n'
-
--- test.lua --
-function lower(a,b)
-    if a < b then
-        return a
-    else
-        return b
-    end
-end
-
-function init()
-    -- expects 2 args
-    register("lower", 2, "lower")
-end

t/cmdlinecalc.txtar

@@ -1,2 +0,0 @@
-exec testrpn 44 55 *
-stdout '2420\n'

t/getman.txtar

@@ -1,2 +0,0 @@
-exec testrpn -m
-stdout 'This software is licensed under the GNU GENERAL PUBLIC LICENSE'

t/getusage.txtar

@@ -1,2 +0,0 @@
-exec testrpn -h
-stdout 'This is rpn'

t/getversion.txtar

@@ -1,2 +0,0 @@
-exec testrpn -v
-stdout 'This is rpn version'

t/stdin-batch-cmd.txtar

@@ -1,4 +0,0 @@
-exec echo 1 2 3 4 5 batch median
-stdin stdout
-exec testrpn
-[unix] stdout '3\n'

t/stdin-batch.txtar

@@ -1,4 +0,0 @@
-exec echo 1 2 3 4 5
-stdin stdout
-[unix] exec testrpn median
-[unix] stdout '3\n'

t/stdin-calc.txtar

@@ -1,4 +0,0 @@
-exec echo 10 10 +
-stdin stdout
-exec testrpn
-[unix] stdout '20\n'

t/stdin-help.txtar

@@ -1,6 +0,0 @@
-stdin input.txt
-exec testrpn
-[unix] stdout 'Available configuration commands'
-
--- input.txt --
-?

t/stdin-use-vars.txtar

@@ -1,13 +0,0 @@
-stdin input.txt
-exec testrpn
-[unix] stdout '28\n'
-
--- input.txt --
-10
-10
-+
->SUM
-clear
-8
-<SUM
-+

t/stdint-explicit-batch.txtar

@@ -1,4 +0,0 @@
-exec echo 1 2 3 4 5 median
-stdin stdout
-exec testrpn -b
-[unix] stdout '3\n'

t/test.lua

@@ -1,13 +0,0 @@
--- simple function, return the lower number of the two operands
-function lower(a,b)
-    if a < b then
-        return a
-    else
-        return b
-    end
-end
-
-function init()
-    -- expects 2 args
-    register("lower", 2, "lower")
-end  

util.go

@@ -23,24 +23,16 @@ import (
 	"strings"
 )
 
-// find an item in a list, generic variant
-func contains[E comparable](s []E, v E) bool {
-	for _, vs := range s {
-		if v == vs {
+// find an item in a list
+func contains(s []string, e string) bool {
+	for _, a := range s {
+		if a == e {
 			return true
 		}
 	}
 	return false
 }
 
-// look if a key in a map exists, generic variant
-func exists[K comparable, V any](m map[K]V, v K) bool {
-	if _, ok := m[v]; ok {
-		return true
-	}
-	return false
-}
-
 func const2num(name string) float64 {
 	switch name {
 	case "Pi":
@@ -71,7 +63,3 @@ func const2num(name string) float64 {
 func list2str(list Numbers) string {
 	return strings.Trim(strings.Join(strings.Fields(fmt.Sprint(list)), " "), "[]")
 }
-
-func Error(m string) error {
-	return fmt.Errorf("Error: %s!", m)
-}