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subCommand.go
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subCommand.go
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package flaggy
import (
"fmt"
"log"
"net"
"os"
"strconv"
"strings"
"time"
)
// Subcommand represents a subcommand which contains a set of child
// subcommands along with a set of flags relevant to it. Parsing
// runs until a subcommand is detected by matching its name and
// position. Once a matching subcommand is found, the next set
// of parsing occurs within that matched subcommand.
type Subcommand struct {
Name string
ShortName string
Description string
Position int // the position of this subcommand, not including flags
Subcommands []*Subcommand
Flags []*Flag
PositionalFlags []*PositionalValue
ParsedValues []parsedValue // a list of values and positionals parsed
AdditionalHelpPrepend string // additional prepended message when Help is displayed
AdditionalHelpAppend string // additional appended message when Help is displayed
Used bool // indicates this subcommand was found and parsed
Hidden bool // indicates this subcommand should be hidden from help
}
// NewSubcommand creates a new subcommand that can have flags or PositionalFlags
// added to it. The position starts with 1, not 0
func NewSubcommand(name string) *Subcommand {
if len(name) == 0 {
fmt.Fprintln(os.Stderr, "Error creating subcommand (NewSubcommand()). No subcommand name was specified.")
exitOrPanic(2)
}
newSC := &Subcommand{
Name: name,
}
return newSC
}
// parseAllFlagsFromArgs parses the non-positional flags such as -f or -v=value
// out of the supplied args and returns the resulting positional items in order,
// all the flag names found (without values), a bool to indicate if help was
// requested, and any errors found during parsing
func (sc *Subcommand) parseAllFlagsFromArgs(p *Parser, args []string) ([]string, bool, error) {
var positionalOnlyArguments []string
var helpRequested bool // indicates the user has supplied -h and we
// should render help if we are the last subcommand
// indicates we should skip the next argument, like when parsing a flag
// that separates key and value by space
var skipNext bool
// endArgfound indicates that a -- was found and everything
// remaining should be added to the trailing arguments slices
var endArgFound bool
// find all the normal flags (not positional) and parse them out
for i, a := range args {
debugPrint("parsing arg:", a)
// evaluate if there is a following arg to avoid panics
var nextArgExists bool
var nextArg string
if len(args)-1 >= i+1 {
nextArgExists = true
nextArg = args[i+1]
}
// if end arg -- has been found, just add everything to TrailingArguments
if endArgFound {
if !p.trailingArgumentsExtracted {
p.TrailingArguments = append(p.TrailingArguments, a)
}
continue
}
// skip this run if specified
if skipNext {
skipNext = false
debugPrint("skipping flag because it is an arg:", a)
continue
}
// parse the flag into its name for consideration without dashes
flagName := parseFlagToName(a)
// if the flag being passed is version or v and the option to display
// version with version flags, then display version
if p.ShowVersionWithVersionFlag {
if flagName == versionFlagLongName {
p.ShowVersionAndExit()
}
}
// if the show Help on h flag option is set, then show Help when h or Help
// is passed as an option
if p.ShowHelpWithHFlag {
if flagName == helpFlagShortName || flagName == helpFlagLongName {
// Ensure this is the last subcommand passed so we give the correct
// help output
helpRequested = true
continue
}
}
// determine what kind of flag this is
argType := determineArgType(a)
// strip flags from arg
debugPrint("Parsing flag named", a, "of type", argType)
// depending on the flag type, parse the key and value out, then apply it
switch argType {
case argIsFinal:
// debugPrint("Arg", i, "is final:", a)
endArgFound = true
case argIsPositional:
// debugPrint("Arg is positional or subcommand:", a)
// this positional argument into a slice of their own, so that
// we can determine if its a subcommand or positional value later
positionalOnlyArguments = append(positionalOnlyArguments, a)
// track this as a parsed value with the subcommand
sc.addParsedPositionalValue(a)
case argIsFlagWithSpace: // a flag with a space. ex) -k v or --key value
a = parseFlagToName(a)
// debugPrint("Arg", i, "is flag with space:", a)
// parse next arg as value to this flag and apply to subcommand flags
// if the flag is a bool flag, then we check for a following positional
// and skip it if necessary
if flagIsBool(sc, p, a) {
debugPrint(sc.Name, "bool flag", a, "next var is:", nextArg)
// set the value in this subcommand and its root parser
valueSet, err := setValueForParsers(a, "true", p, sc)
// if an error occurs, just return it and quit parsing
if err != nil {
return []string{}, false, err
}
// log all values parsed by this subcommand. We leave the value blank
// because the bool value had no explicit true or false supplied
if valueSet {
sc.addParsedFlag(a, "")
}
// we've found and set a standalone bool flag, so we move on to the next
// argument in the list of arguments
continue
}
skipNext = true
// debugPrint(sc.Name, "NOT bool flag", a)
// if the next arg was not found, then show a Help message
if !nextArgExists {
p.ShowHelpWithMessage("Expected a following arg for flag " + a + ", but it did not exist.")
exitOrPanic(2)
}
valueSet, err := setValueForParsers(a, nextArg, p, sc)
if err != nil {
return []string{}, false, err
}
// log all parsed values in the subcommand
if valueSet {
sc.addParsedFlag(a, nextArg)
}
case argIsFlagWithValue: // a flag with an equals sign. ex) -k=v or --key=value
// debugPrint("Arg", i, "is flag with value:", a)
a = parseFlagToName(a)
// parse flag into key and value and apply to subcommand flags
key, val := parseArgWithValue(a)
// set the value in this subcommand and its root parser
valueSet, err := setValueForParsers(key, val, p, sc)
if err != nil {
return []string{}, false, err
}
// log all values parsed by the subcommand
if valueSet {
sc.addParsedFlag(a, val)
}
}
}
return positionalOnlyArguments, helpRequested, nil
}
// findAllParsedValues finds all values parsed by all subcommands and this
// subcommand and its child subcommands
func (sc *Subcommand) findAllParsedValues() []parsedValue {
parsedValues := sc.ParsedValues
for _, sc := range sc.Subcommands {
// skip unused subcommands
if !sc.Used {
continue
}
parsedValues = append(parsedValues, sc.findAllParsedValues()...)
}
return parsedValues
}
// parse causes the argument parser to parse based on the supplied []string.
// depth specifies the non-flag subcommand positional depth. A slice of flags
// and subcommands parsed is returned so that the parser can ultimately decide
// if there were any unexpected values supplied by the user
func (sc *Subcommand) parse(p *Parser, args []string, depth int) error {
debugPrint("- Parsing subcommand", sc.Name, "with depth of", depth, "and args", args)
// if a command is parsed, its used
sc.Used = true
debugPrint("used subcommand", sc.Name, sc.ShortName)
if len(sc.Name) > 0 {
sc.addParsedPositionalValue(sc.Name)
}
if len(sc.ShortName) > 0 {
sc.addParsedPositionalValue(sc.ShortName)
}
// as subcommands are used, they become the context of the parser. This helps
// us understand how to display help based on which subcommand is being used
p.subcommandContext = sc
// ensure that help and version flags are not used if the parser has the
// built-in help and version flags enabled
if p.ShowHelpWithHFlag {
sc.ensureNoConflictWithBuiltinHelp()
}
if p.ShowVersionWithVersionFlag {
sc.ensureNoConflictWithBuiltinVersion()
}
// Parse the normal flags out of the argument list and return the positionals
// (subcommands and positional values), along with the flags used.
// Then the flag values are applied to the parent parser and the current
// subcommand being parsed.
positionalOnlyArguments, helpRequested, err := sc.parseAllFlagsFromArgs(p, args)
if err != nil {
return err
}
// indicate that trailing arguments have been extracted, so that they aren't
// appended a second time
p.trailingArgumentsExtracted = true
// loop over positional values and look for their matching positional
// parameter, or their positional command. If neither are found, then
// we throw an error
var parsedArgCount int
for pos, v := range positionalOnlyArguments {
// the first relative positional argument will be human natural at position 1
// but offset for the depth of relative commands being parsed for currently.
relativeDepth := pos - depth + 1
// debugPrint("Parsing positional only position", relativeDepth, "with value", v)
if relativeDepth < 1 {
// debugPrint(sc.Name, "skipped value:", v)
continue
}
parsedArgCount++
// determine subcommands and parse them by positional value and name
for _, cmd := range sc.Subcommands {
// debugPrint("Subcommand being compared", relativeDepth, "==", cmd.Position, "and", v, "==", cmd.Name, "==", cmd.ShortName)
if relativeDepth == cmd.Position && (v == cmd.Name || v == cmd.ShortName) {
debugPrint("Decending into positional subcommand", cmd.Name, "at relativeDepth", relativeDepth, "and absolute depth", depth+1)
return cmd.parse(p, args, depth+parsedArgCount) // continue recursive positional parsing
}
}
// determine positional args and parse them by positional value and name
var foundPositional bool
for _, val := range sc.PositionalFlags {
if relativeDepth == val.Position {
debugPrint("Found a positional value at relativePos:", relativeDepth, "value:", v)
// set original value for help output
val.defaultValue = *val.AssignmentVar
// defrerence the struct pointer, then set the pointer property within it
*val.AssignmentVar = v
// debugPrint("set positional to value", *val.AssignmentVar)
foundPositional = true
val.Found = true
break
}
}
// if there aren't any positional flags but there are subcommands that
// were not used, display a useful message with subcommand options.
if !foundPositional {
if p.ShowHelpOnUnexpected {
debugPrint("No positional at position", relativeDepth)
var foundSubcommandAtDepth bool
for _, cmd := range sc.Subcommands {
if cmd.Position == relativeDepth {
foundSubcommandAtDepth = true
}
}
// if there is a subcommand here but it was not specified, display them all
// as a suggestion to the user before exiting.
if foundSubcommandAtDepth {
// determine which name to use in upcoming help output
fmt.Fprintln(os.Stderr, sc.Name+":", "No subcommand or positional value found at position", strconv.Itoa(relativeDepth)+".")
var output string
for _, cmd := range sc.Subcommands {
if cmd.Hidden {
continue
}
output = output + " " + cmd.Name
}
// if there are available subcommands, let the user know
if len(output) > 0 {
output = strings.TrimLeft(output, " ")
fmt.Println("Available subcommands:", output)
}
exitOrPanic(2)
}
// if there were not any flags or subcommands at this position at all, then
// throw an error (display Help if necessary)
p.ShowHelpWithMessage("Unexpected argument: " + v)
exitOrPanic(2)
} else {
// if no positional value was registered at this position, but the parser is not
// configured to show help when any unexpected command is found, add this positional
// to the list of trailing arguments. This allows for any number of unspecified
// values to be added at the end of the arguments list without using the ---
// trailing arguments separator.
p.TrailingArguments = append(p.TrailingArguments, v)
}
}
}
// if help was requested and we should show help when h is passed,
if helpRequested && p.ShowHelpWithHFlag {
p.ShowHelp()
exitOrPanic(0)
}
// find any positionals that were not used on subcommands that were
// found and throw help (unknown argument) in the global parse or subcommand
for _, pv := range p.PositionalFlags {
if pv.Required && !pv.Found {
p.ShowHelpWithMessage("Required global positional variable " + pv.Name + " not found at position " + strconv.Itoa(pv.Position))
exitOrPanic(2)
}
}
for _, pv := range sc.PositionalFlags {
if pv.Required && !pv.Found {
p.ShowHelpWithMessage("Required positional of subcommand " + sc.Name + " named " + pv.Name + " not found at position " + strconv.Itoa(pv.Position))
exitOrPanic(2)
}
}
return nil
}
// addParsedFlag makes it easy to append flag values parsed by the subcommand
func (sc *Subcommand) addParsedFlag(key string, value string) {
sc.ParsedValues = append(sc.ParsedValues, newParsedValue(key, value, false))
}
// addParsedPositionalValue makes it easy to append positionals parsed by the
// subcommand
func (sc *Subcommand) addParsedPositionalValue(value string) {
sc.ParsedValues = append(sc.ParsedValues, newParsedValue("", value, true))
}
// FlagExists lets you know if the flag name exists as either a short or long
// name in the (sub)command
func (sc *Subcommand) FlagExists(name string) bool {
for _, f := range sc.Flags {
if f.HasName(name) {
return true
}
}
return false
}
// AttachSubcommand adds a possible subcommand to the Parser.
func (sc *Subcommand) AttachSubcommand(newSC *Subcommand, relativePosition int) {
// assign the depth of the subcommand when its attached
newSC.Position = relativePosition
// ensure no subcommands at this depth with this name
for _, other := range sc.Subcommands {
if newSC.Position == other.Position {
if newSC.Name != "" {
if newSC.Name == other.Name {
log.Panicln("Unable to add subcommand because one already exists at position" + strconv.Itoa(newSC.Position) + " with name " + other.Name)
}
}
if newSC.ShortName != "" {
if newSC.ShortName == other.ShortName {
log.Panicln("Unable to add subcommand because one already exists at position" + strconv.Itoa(newSC.Position) + " with name " + other.ShortName)
}
}
}
}
// ensure no positionals at this depth
for _, other := range sc.PositionalFlags {
if newSC.Position == other.Position {
log.Panicln("Unable to add subcommand because a positional value already exists at position " + strconv.Itoa(newSC.Position) + ": " + other.Name)
}
}
sc.Subcommands = append(sc.Subcommands, newSC)
}
// add is a "generic" to add flags of any type. Checks the supplied parent
// parser to ensure that the user isn't setting version or help flags that
// conflict with the built-in help and version flag behavior.
func (sc *Subcommand) add(assignmentVar interface{}, shortName string, longName string, description string) {
// if the flag is already used, throw an error
for _, existingFlag := range sc.Flags {
if longName != "" && existingFlag.LongName == longName {
log.Panicln("Flag " + longName + " added to subcommand " + sc.Name + " but the name is already assigned.")
}
if shortName != "" && existingFlag.ShortName == shortName {
log.Panicln("Flag " + shortName + " added to subcommand " + sc.Name + " but the short name is already assigned.")
}
}
newFlag := Flag{
AssignmentVar: assignmentVar,
ShortName: shortName,
LongName: longName,
Description: description,
}
sc.Flags = append(sc.Flags, &newFlag)
}
// String adds a new string flag
func (sc *Subcommand) String(assignmentVar *string, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// StringSlice adds a new slice of strings flag
// Specify the flag multiple times to fill the slice
func (sc *Subcommand) StringSlice(assignmentVar *[]string, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Bool adds a new bool flag
func (sc *Subcommand) Bool(assignmentVar *bool, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// BoolSlice adds a new slice of bools flag
// Specify the flag multiple times to fill the slice
func (sc *Subcommand) BoolSlice(assignmentVar *[]bool, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// ByteSlice adds a new slice of bytes flag
// Specify the flag multiple times to fill the slice. Takes hex as input.
func (sc *Subcommand) ByteSlice(assignmentVar *[]byte, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Duration adds a new time.Duration flag.
// Input format is described in time.ParseDuration().
// Example values: 1h, 1h50m, 32s
func (sc *Subcommand) Duration(assignmentVar *time.Duration, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// DurationSlice adds a new time.Duration flag.
// Input format is described in time.ParseDuration().
// Example values: 1h, 1h50m, 32s
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) DurationSlice(assignmentVar *[]time.Duration, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Float32 adds a new float32 flag.
func (sc *Subcommand) Float32(assignmentVar *float32, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Float32Slice adds a new float32 flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) Float32Slice(assignmentVar *[]float32, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Float64 adds a new float64 flag.
func (sc *Subcommand) Float64(assignmentVar *float64, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Float64Slice adds a new float64 flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) Float64Slice(assignmentVar *[]float64, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int adds a new int flag
func (sc *Subcommand) Int(assignmentVar *int, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// IntSlice adds a new int slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) IntSlice(assignmentVar *[]int, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt adds a new uint flag
func (sc *Subcommand) UInt(assignmentVar *uint, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UIntSlice adds a new uint slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) UIntSlice(assignmentVar *[]uint, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt64 adds a new uint64 flag
func (sc *Subcommand) UInt64(assignmentVar *uint64, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt64Slice adds a new uint64 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) UInt64Slice(assignmentVar *[]uint64, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt32 adds a new uint32 flag
func (sc *Subcommand) UInt32(assignmentVar *uint32, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt32Slice adds a new uint32 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) UInt32Slice(assignmentVar *[]uint32, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt16 adds a new uint16 flag
func (sc *Subcommand) UInt16(assignmentVar *uint16, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt16Slice adds a new uint16 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) UInt16Slice(assignmentVar *[]uint16, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt8 adds a new uint8 flag
func (sc *Subcommand) UInt8(assignmentVar *uint8, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// UInt8Slice adds a new uint8 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) UInt8Slice(assignmentVar *[]uint8, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int64 adds a new int64 flag.
func (sc *Subcommand) Int64(assignmentVar *int64, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int64Slice adds a new int64 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) Int64Slice(assignmentVar *[]int64, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int32 adds a new int32 flag
func (sc *Subcommand) Int32(assignmentVar *int32, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int32Slice adds a new int32 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) Int32Slice(assignmentVar *[]int32, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int16 adds a new int16 flag
func (sc *Subcommand) Int16(assignmentVar *int16, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int16Slice adds a new int16 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) Int16Slice(assignmentVar *[]int16, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int8 adds a new int8 flag
func (sc *Subcommand) Int8(assignmentVar *int8, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// Int8Slice adds a new int8 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) Int8Slice(assignmentVar *[]int8, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// IP adds a new net.IP flag.
func (sc *Subcommand) IP(assignmentVar *net.IP, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// IPSlice adds a new int8 slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) IPSlice(assignmentVar *[]net.IP, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// HardwareAddr adds a new net.HardwareAddr flag.
func (sc *Subcommand) HardwareAddr(assignmentVar *net.HardwareAddr, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// HardwareAddrSlice adds a new net.HardwareAddr slice flag.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) HardwareAddrSlice(assignmentVar *[]net.HardwareAddr, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// IPMask adds a new net.IPMask flag. IPv4 Only.
func (sc *Subcommand) IPMask(assignmentVar *net.IPMask, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// IPMaskSlice adds a new net.HardwareAddr slice flag. IPv4 only.
// Specify the flag multiple times to fill the slice.
func (sc *Subcommand) IPMaskSlice(assignmentVar *[]net.IPMask, shortName string, longName string, description string) {
sc.add(assignmentVar, shortName, longName, description)
}
// AddPositionalValue adds a positional value to the subcommand. the
// relativePosition starts at 1 and is relative to the subcommand it belongs to
func (sc *Subcommand) AddPositionalValue(assignmentVar *string, name string, relativePosition int, required bool, description string) {
// ensure no other positionals are at this depth
for _, other := range sc.PositionalFlags {
if relativePosition == other.Position {
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 " + name + "because a subcommand, " + other.Name + ", already exists at position: " + strconv.Itoa(relativePosition))
}
}
newPositionalValue := PositionalValue{
Name: name,
Position: relativePosition,
AssignmentVar: assignmentVar,
Required: required,
Description: description,
defaultValue: *assignmentVar,
}
sc.PositionalFlags = append(sc.PositionalFlags, &newPositionalValue)
}
// SetValueForKey sets the value for the specified key. If setting a bool
// value, then send "true" or "false" as strings. The returned bool indicates
// that a value was set.
func (sc *Subcommand) SetValueForKey(key string, value string) (bool, error) {
// debugPrint("Looking to set key", key, "to value", value)
// check for and assign flags that match the key
for _, f := range sc.Flags {
// 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)
if err := f.identifyAndAssignValue(value); err != nil {
return false, err
}
return true, nil
}
}
// debugPrint(sc.Name, "was unable to find a key named", key, "to set to value", value)
return false, nil
}
// ensureNoConflictWithBuiltinHelp ensures that the flags on this subcommand do
// not conflict with the builtin help flags (-h or --help). Exits the program
// if a conflict is found.
func (sc *Subcommand) ensureNoConflictWithBuiltinHelp() {
for _, f := range sc.Flags {
if f.LongName == helpFlagLongName {
sc.exitBecauseOfHelpFlagConflict(f.LongName)
}
if f.LongName == helpFlagShortName {
sc.exitBecauseOfHelpFlagConflict(f.LongName)
}
if f.ShortName == helpFlagLongName {
sc.exitBecauseOfHelpFlagConflict(f.ShortName)
}
if f.ShortName == helpFlagShortName {
sc.exitBecauseOfHelpFlagConflict(f.ShortName)
}
}
}
// ensureNoConflictWithBuiltinVersion ensures that the flags on this subcommand do
// not conflict with the builtin version flag (--version). Exits the program
// if a conflict is found.
func (sc *Subcommand) ensureNoConflictWithBuiltinVersion() {
for _, f := range sc.Flags {
if f.LongName == versionFlagLongName {
sc.exitBecauseOfVersionFlagConflict(f.LongName)
}
if f.ShortName == versionFlagLongName {
sc.exitBecauseOfVersionFlagConflict(f.ShortName)
}
}
}
// exitBecauseOfVersionFlagConflict exits the program with a message about how to prevent
// flags being defined from conflicting with the builtin flags.
func (sc *Subcommand) exitBecauseOfVersionFlagConflict(flagName string) {
fmt.Println(`Flag with name '` + flagName + `' conflicts with the internal --version flag in flaggy.
You must either change the flag's name, or disable flaggy's internal version
flag with 'flaggy.DefaultParser.ShowVersionWithVersionFlag = false'. If you are using
a custom parser, you must instead set '.ShowVersionWithVersionFlag = false' on it.`)
exitOrPanic(1)
}
// exitBecauseOfHelpFlagConflict exits the program with a message about how to prevent
// flags being defined from conflicting with the builtin flags.
func (sc *Subcommand) exitBecauseOfHelpFlagConflict(flagName string) {
fmt.Println(`Flag with name '` + flagName + `' conflicts with the internal --help or -h flag in flaggy.
You must either change the flag's name, or disable flaggy's internal help
flag with 'flaggy.DefaultParser.ShowHelpWithHFlag = false'. If you are using
a custom parser, you must instead set '.ShowHelpWithHFlag = false' on it.`)
exitOrPanic(1)
}