merge master changes

flaggy_test.go

@@ -137,6 +137,9 @@ func TestComplexNesting(t *testing.T) {
 		t.Log("testE", testE)
 		t.FailNow()
 	}
+	if subcommandName := flaggy.DefaultParser.TrailingSubcommand().Name; subcommandName != "scD" {
+		t.Fatal("Used subcommand was incorrect:", subcommandName)
+	}
 
 }
 
@@ -206,5 +209,8 @@ func TestParsePositionalsA(t *testing.T) {
 	if parser.TrailingArguments[1] != "trailingB" {
 		t.Fatal("Trailing argumentB was incorrect:", parser.TrailingArguments[1])
 	}
+	if subcommandName := parser.TrailingSubcommand().Name; subcommandName != "subcommand" {
+		t.Fatal("Used subcommand was incorrect:", subcommandName)
+	}
 
 }

go.mod

@@ -1,3 +1,5 @@
 module github.com/integrii/flaggy
 
 go 1.12
+
+require github.com/google/go-cmp v0.5.6 // for tests only

go.sum

@@ -0,0 +1,4 @@
+github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

helpValues.go

@@ -52,7 +52,6 @@ type HelpFlag struct {
 // parser. The parser is required in order to detect default flag settings
 // for help and version output.
 func (h *Help) ExtractValues(p *Parser, message string) {
-
 	// accept message string for output
 	h.Message = message
 
@@ -187,13 +186,11 @@ func (h *Help) ExtractValues(p *Parser, message string) {
 	}
 
 	h.UsageString = usageString
-
 }
 
 // parseFlagsToHelpFlags parses the specified slice of flags into
 // help flags on the the calling help command
 func (h *Help) parseFlagsToHelpFlags(flags []*Flag, maxLength int) {
-
 	for _, f := range flags {
 		if f.Hidden {
 			continue

helpValues_blackbox_test.go

@@ -1,22 +1,59 @@
 package flaggy_test
 
 import (
+	"os"
+	"strings"
 	"testing"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
 	"github.com/integrii/flaggy"
 )
 
 func TestMinimalHelpOutput(t *testing.T) {
 	p := flaggy.NewParser("TestMinimalHelpOutput")
+
+	rd, wr, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("pipe: error: %s", err)
+	}
+	savedStderr := os.Stderr
+	os.Stderr = wr
+
+	defer func() {
+		os.Stderr = savedStderr
+	}()
+
 	p.ShowHelp()
+
+	buf := make([]byte, 1024)
+	n, err := rd.Read(buf)
+	if err != nil {
+		t.Fatalf("read: error: %s", err)
+	}
+	got := strings.Split(string(buf[:n]), "\n")
+	want := []string{
+		"",
+		"",
+		"  Flags: ",
+		"       --version   Displays the program version string.",
+		"    -h --help      Displays help with available flag, subcommand, and positional value parameters.",
+		"",
+		"",
+	}
+
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("help mismatch (-want +got):\n%s", diff)
+	}
 }
 
 func TestHelpWithMissingSCName(t *testing.T) {
 	defer func() {
 		r := recover()
-		if r == nil {
-			t.Fatal("Expected panic with subcommand avilability at position, but did not get one")
+		gotMsg := r.(string)
+		wantMsg := "Panic instead of exit with code: 2"
+		if gotMsg != wantMsg {
+			t.Fatalf("error: got: %s; want: %s", gotMsg, wantMsg)
 		}
 	}()
 	flaggy.ResetParser()
@@ -62,6 +99,45 @@ func TestHelpOutput(t *testing.T) {
 	p.Duration(&durationFlag, "d", "durationFlag", "This is a test duration flag that does some untimely stuff.")
 	p.AdditionalHelpPrepend = "This is a prepend for help"
 	p.AdditionalHelpAppend = "This is an append for help"
-	p.ParseArgs([]string{"subcommandA", "subcommandB", "hiddenPositional1"})
+
+	rd, wr, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("pipe: error: %s", err)
+	}
+	savedStderr := os.Stderr
+	os.Stderr = wr
+
+	defer func() {
+		os.Stderr = savedStderr
+	}()
+
+	if err := p.ParseArgs([]string{"subcommandA", "subcommandB", "hiddenPositional1"}); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 	p.ShowHelpWithMessage("This is a help message on exit")
+
+	buf := make([]byte, 1024)
+	n, err := rd.Read(buf)
+	if err != nil {
+		t.Fatalf("read: error: %s", err)
+	}
+	got := strings.Split(string(buf[:n]), "\n")
+	want := []string{
+		"subcommandB - Subcommand B is a command that does other stuff",
+		"",
+		"  Flags: ",
+		"       --version        Displays the program version string.",
+		"    -h --help           Displays help with available flag, subcommand, and positional value parameters.",
+		"    -s --stringFlag     This is a test string flag that does some stringy string stuff. (default: defaultStringHere)",
+		"    -i --intFlg         This is a test int flag that does some interesting int stuff. (default: 0)",
+		"    -b --boolFlag       This is a test bool flag that does some booly bool stuff.",
+		"    -d --durationFlag   This is a test duration flag that does some untimely stuff. (default: 0s)",
+		"",
+		"This is a help message on exit",
+		"",
+	}
+
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("help mismatch (-want +got):\n%s", diff)
+	}
 }

parser.go

@@ -26,6 +26,11 @@ type Parser struct {
 	subcommandContext          *Subcommand        // points to the most specific subcommand being used
 }
 
+// TrailingSubcommand returns the last and most specific subcommand invoked.
+func (p *Parser) TrailingSubcommand() *Subcommand {
+	return p.subcommandContext
+}
+
 // NewParser creates a new ArgumentParser ready to parse inputs
 func NewParser(name string) *Parser {
 	// this can not be done inline because of struct embedding

subCommand.go

@@ -666,14 +666,14 @@ func (sc *Subcommand) AddPositionalValue(assignmentVar *string, name string, rel
 	// ensure no other positionals are at this depth
 	for _, other := range sc.PositionalFlags {
 		if relativePosition == other.Position {
-			log.Panicln("Unable to add positional value because one already exists at position: " + strconv.Itoa(relativePosition))
+			log.Panicln("Unable to add positional value " + name + " because " + other.Name + " already exists at position: " + strconv.Itoa(relativePosition))
 		}
 	}
 
 	// ensure no subcommands at this depth
 	for _, other := range sc.Subcommands {
 		if relativePosition == other.Position {
-			log.Panicln("Unable to add positional value a subcommand already exists at position: " + strconv.Itoa(relativePosition))
+			log.Panicln("Unable to add positional value " + name + "because a subcommand, " + other.Name + ", already exists at position: " + strconv.Itoa(relativePosition))
 		}
 	}
 
@@ -699,7 +699,9 @@ func (sc *Subcommand) SetValueForKey(key string, value string) (bool, error) {
 		// debugPrint("Evaluating string flag", f.ShortName, "==", key, "||", f.LongName, "==", key)
 		if f.ShortName == key || f.LongName == key {
 			// debugPrint("Setting string value for", key, "to", value)
-			f.identifyAndAssignValue(value)
+			if err := f.identifyAndAssignValue(value); err != nil {
+				return false, err
+			}
 			return true, nil
 		}
 	}

subcommand_test.go

@@ -21,7 +21,6 @@ func TestSCNameExists(t *testing.T) {
 	scB := flaggy.NewSubcommand("test")
 	flaggy.AttachSubcommand(scA, 1)
 	flaggy.AttachSubcommand(scB, 1)
-
 }
 
 func TestFlagExists(t *testing.T) {
@@ -37,7 +36,6 @@ func TestFlagExists(t *testing.T) {
 	if e == false {
 		t.Fatal("Flag does not exist on a subcommand that should")
 	}
-
 }
 
 // TestExitOnUnknownFlag tests that when an unknown flag is supplied and the
@@ -157,7 +155,9 @@ func TestTypoSubcommand(t *testing.T) {
 	newSCB := flaggy.NewSubcommand("TestTypoSubcommandB")
 	p.AttachSubcommand(newSCA, 1)
 	p.AttachSubcommand(newSCB, 1)
-	p.ParseArgs(args)
+	if err := p.ParseArgs(args); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 // TestIgnoreUnexpected tests what happens when an invalid subcommand is passed but should be ignored
@@ -167,7 +167,9 @@ func TestIgnoreUnexpected(t *testing.T) {
 	args := []string{"unexpectedArg"}
 	newSCA := flaggy.NewSubcommand("TestTypoSubcommandA")
 	p.AttachSubcommand(newSCA, 1)
-	p.ParseArgs(args)
+	if err := p.ParseArgs(args); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 // TestSubcommandHelp tests displaying of help on unspecified commands
@@ -181,7 +183,9 @@ func TestSubcommandHelp(t *testing.T) {
 	p := flaggy.NewParser("TestSubcommandHelp")
 	p.ShowHelpOnUnexpected = true
 	args := []string{"unexpectedArg"}
-	p.ParseArgs(args)
+	if err := p.ParseArgs(args); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 func TestHelpWithHFlagA(t *testing.T) {
@@ -194,7 +198,9 @@ func TestHelpWithHFlagA(t *testing.T) {
 	p := flaggy.NewParser("TestHelpWithHFlag")
 	p.ShowHelpWithHFlag = true
 	args := []string{"-h"}
-	p.ParseArgs(args)
+	if err := p.ParseArgs(args); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 func TestHelpWithHFlagB(t *testing.T) {
@@ -207,7 +213,9 @@ func TestHelpWithHFlagB(t *testing.T) {
 	p := flaggy.NewParser("TestHelpWithHFlag")
 	p.ShowHelpWithHFlag = true
 	args := []string{"--help"}
-	p.ParseArgs(args)
+	if err := p.ParseArgs(args); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 func TestVersionWithVFlagB(t *testing.T) {
@@ -221,7 +229,9 @@ func TestVersionWithVFlagB(t *testing.T) {
 	p.ShowVersionWithVersionFlag = true
 	p.Version = "TestVersionWithVFlagB 0.0.0a"
 	args := []string{"--version"}
-	p.ParseArgs(args)
+	if err := p.ParseArgs(args); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 // TestSubcommandParse tests paring of a single subcommand
@@ -243,7 +253,9 @@ func TestSubcommandParse(t *testing.T) {
 
 	// override os args and parse them
 	os.Args = []string{"binaryName", "testSubcommand", "testPositional"}
-	p.Parse()
+	if err := p.Parse(); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 
 	// ensure subcommand and positional used
 	if !newSC.Used {
@@ -255,7 +267,6 @@ func TestSubcommandParse(t *testing.T) {
 }
 
 func TestBadSubcommand(t *testing.T) {
-
 	// create the argument parser
 	p := flaggy.NewParser("TestBadSubcommand")
 
@@ -265,11 +276,12 @@ func TestBadSubcommand(t *testing.T) {
 
 	//  test what happens if you add a bad subcommand
 	os.Args = []string{"test"}
-	p.Parse()
+	if err := p.Parse(); err != nil {
+		t.Fatalf("got: %s; want: no error", err)
+	}
 }
 
 func TestBadPositional(t *testing.T) {
-
 	// create the argument parser
 	p := flaggy.NewParser("TestBadPositional")
 
@@ -310,7 +322,6 @@ func debugOff() {
 // BenchmarkSubcommandParse benchmarks the creation and parsing of
 // a basic subcommand
 func BenchmarkSubcommandParse(b *testing.B) {
-
 	// catch errors that may occur
 	defer func(b *testing.B) {
 		err := recover()
@@ -342,7 +353,6 @@ func BenchmarkSubcommandParse(b *testing.B) {
 			b.Fatal("Error parsing args: " + err.Error())
 		}
 	}
-
 }
 
 // TestSCInputParsing tests all flag types on subcommands
@@ -804,3 +814,18 @@ func TestNestedSCBoolFlag(t *testing.T) {
 		t.Fatal("Error parsing args: " + err.Error())
 	}
 }
+
+func TestParseErrorsAreReportedRegression(t *testing.T) {
+	defer func() {
+		r := recover()
+		if r == nil {
+			t.Fatal("Expected crash on invalid syntax")
+		}
+	}()
+
+	flaggy.ResetParser()
+	intFlag := 42
+	flaggy.Int(&intFlag, "i", "int", "dummy")
+	os.Args = []string{"prog", "--int", "abc"}
+	flaggy.Parse()
+}