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Support for flags before commands

This commit is contained in:
spf13 2014-06-17 12:32:27 -04:00
parent 07be8145cc
commit 10a8494a87
3 changed files with 171 additions and 121 deletions
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25
README.md
View File

@ -18,6 +18,13 @@ all commands.
Cobra has an exceptionally clean interface and simple design without needless
constructors or initialization methods.
Applications built with Cobra commands are designed to be as user friendly as
possible. Flags can be placed before or after the command (as long as a
confusing space isn’t provided). Both short and long flags can be used. A
command need not even be fully typed. The shortest unambiguous string will
suffice. Help is automatically generated and available for the application or
for a specific command using either the help command or the --help flag.
## Concepts
Cobra is built on a structure of commands & flags.
@ -283,14 +290,13 @@ You can provide your own command, function or template through the following met
The latter two will also apply to any children commands.
## Usage
When the user provides an invalid flag or invalid command Cobra responds by
showing the user the 'usage'
### Example
You may recognize this from the help above. That's because the default help
You may recognize this from the help above. That's because the default help
embeds the usage as part of it's output.
Usage:
@ -332,7 +338,22 @@ Like help the function and template are over ridable through public methods.
command.SetUsageTemplate(s string)
## Debugging
Cobra provides a ‘DebugFlags’ method on a command which when called will print
out everything Cobra knows about the flags for each command
### Example
command.DebugFlags()
## Release Notes
* **0.9.0** June 17, 2014
* flags can appears anywhere in the args (provided they are unambiguous)
* --help prints usage screen for app or command
* Prefix matching for commands
* Cleaner looking help and usage output
* Extensive test suite
* **0.8.0** Nov 5, 2013
* Reworked interface to remove commander completely
* Command now primary structure

190
cobra_test.go
View File

@ -168,10 +168,7 @@ func checkOutputContains(t *testing.T, c *Command, check string) {
}
func TestSingleCommand(t *testing.T) {
c := initialize()
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("print one two", " "))
c.Execute()
noRRSetupTest("print one two")
if te != nil || tt != nil {
t.Error("Wrong command called")
@ -185,11 +182,7 @@ func TestSingleCommand(t *testing.T) {
}
func TestChildCommand(t *testing.T) {
c := initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo times one two", " "))
c.Execute()
noRRSetupTest("echo times one two")
if te != nil || tp != nil {
t.Error("Wrong command called")
@ -203,11 +196,7 @@ func TestChildCommand(t *testing.T) {
}
func TestChildCommandPrefix(t *testing.T) {
c := initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("ech tim one two", " "))
c.Execute()
noRRSetupTest("ech tim one two")
if te != nil || tp != nil {
t.Error("Wrong command called")
@ -255,10 +244,7 @@ func TestChildSameNamePrefix(t *testing.T) {
}
func TestFlagLong(t *testing.T) {
c := initialize()
c.AddCommand(cmdPrint, cmdEcho, cmdTimes)
c.SetArgs(strings.Split("echo --intone=13 something here", " "))
c.Execute()
noRRSetupTest("echo --intone=13 something here")
if strings.Join(te, " ") != "something here" {
t.Errorf("flags didn't leave proper args remaining..%s given", te)
@ -272,10 +258,7 @@ func TestFlagLong(t *testing.T) {
}
func TestFlagShort(t *testing.T) {
c := initialize()
c.AddCommand(cmdPrint, cmdEcho, cmdTimes)
c.SetArgs(strings.Split("echo -i13 something here", " "))
c.Execute()
noRRSetupTest("echo -i13 something here")
if strings.Join(te, " ") != "something here" {
t.Errorf("flags didn't leave proper args remaining..%s given", te)
@ -287,10 +270,7 @@ func TestFlagShort(t *testing.T) {
t.Errorf("default flag value changed, 234 expected, %d given", flagi2)
}
c = initialize()
c.AddCommand(cmdPrint, cmdEcho, cmdTimes)
c.SetArgs(strings.Split("echo -i 13 something here", " "))
c.Execute()
noRRSetupTest("echo -i 13 something here")
if strings.Join(te, " ") != "something here" {
t.Errorf("flags didn't leave proper args remaining..%s given", te)
@ -302,11 +282,7 @@ func TestFlagShort(t *testing.T) {
t.Errorf("default flag value changed, 234 expected, %d given", flagi2)
}
// Testing same shortcode, different command
c = initialize()
c.AddCommand(cmdPrint, cmdEcho, cmdTimes)
c.SetArgs(strings.Split("print -i99 one two", " "))
c.Execute()
noRRSetupTest("print -i99 one two")
if strings.Join(tp, " ") != "one two" {
t.Errorf("flags didn't leave proper args remaining..%s given", tp)
@ -320,33 +296,21 @@ func TestFlagShort(t *testing.T) {
}
func TestChildCommandFlags(t *testing.T) {
c := initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo times -j 99 one two", " "))
c.Execute()
noRRSetupTest("echo times -j 99 one two")
if strings.Join(tt, " ") != "one two" {
t.Errorf("flags didn't leave proper args remaining..%s given", tt)
}
buf := new(bytes.Buffer)
// Testing with flag that shouldn't be persistent
c = initialize()
c.SetOutput(buf)
// define children
c.AddCommand(cmdPrint, cmdEcho)
// define grandchild
cmdEcho.AddCommand(cmdTimes)
c.SetArgs(strings.Split("echo times -j 99 -i77 one two", " "))
e := c.Execute()
r := noRRSetupTest("echo times -j 99 -i77 one two")
if e == nil {
if r.Error == nil {
t.Errorf("invalid flag should generate error")
}
if !strings.Contains(buf.String(), "unknown shorthand") {
t.Errorf("Wrong error message displayed, \n %s", buf.String())
if !strings.Contains(r.Output, "unknown shorthand") {
t.Errorf("Wrong error message displayed, \n %s", r.Output)
}
if flagi2 != 99 {
@ -358,61 +322,38 @@ func TestChildCommandFlags(t *testing.T) {
}
// Testing with flag only existing on child
buf.Reset()
c = initialize()
c.SetOutput(buf)
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo -j 99 -i77 one two", " "))
err := c.Execute()
r = noRRSetupTest("echo -j 99 -i77 one two")
if err == nil {
if r.Error == nil {
t.Errorf("invalid flag should generate error")
}
if !strings.Contains(buf.String(), "intone=123") {
t.Errorf("Wrong error message displayed, \n %s", buf.String())
if !strings.Contains(r.Output, "intone=123") {
t.Errorf("Wrong error message displayed, \n %s", r.Output)
}
// Testing flag with invalid input
buf.Reset()
c = initialize()
c.SetOutput(buf)
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo -i10E", " "))
err = c.Execute()
r = noRRSetupTest("echo -i10E")
if err == nil {
if r.Error == nil {
t.Errorf("invalid input should generate error")
}
if !strings.Contains(buf.String(), "invalid argument \"10E\" for -i10E") {
t.Errorf("Wrong error message displayed, \n %s", buf.String())
if !strings.Contains(r.Output, "invalid argument \"10E\" for -i10E") {
t.Errorf("Wrong error message displayed, \n %s", r.Output)
}
}
func TestTrailingCommandFlags(t *testing.T) {
buf := new(bytes.Buffer)
c := initialize()
c.SetOutput(buf)
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo two -x", " "))
e3 := c.Execute()
x := fullSetupTest("echo two -x")
if e3 == nil {
if x.Error == nil {
t.Errorf("invalid flag should generate error")
}
}
func TestPersistentFlags(t *testing.T) {
c := initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo -s something more here", " "))
c.Execute()
fullSetupTest("echo -s something more here")
// persistentFlag should act like normal flag on it's own command
if strings.Join(te, " ") != "more here" {
@ -424,11 +365,7 @@ func TestPersistentFlags(t *testing.T) {
t.Errorf("string flag didn't get correct value, had %v", flags1)
}
c = initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("echo times -s again -c test here", " "))
c.Execute()
fullSetupTest("echo times -s again -c test here")
if strings.Join(tt, " ") != "test here" {
t.Errorf("flags didn't leave proper args remaining..%s given", tt)
@ -444,26 +381,15 @@ func TestPersistentFlags(t *testing.T) {
}
func TestHelpCommand(t *testing.T) {
c := initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("help echo", " "))
c := fullSetupTest("help echo")
checkResultContains(t, c, cmdEcho.Long)
checkOutputContains(t, c, cmdEcho.Long)
c = initialize()
cmdEcho.AddCommand(cmdTimes)
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("help echo times", " "))
checkOutputContains(t, c, cmdTimes.Long)
r := fullSetupTest("help echo times")
checkResultContains(t, r, cmdTimes.Long)
}
func TestRunnableRootCommand(t *testing.T) {
c := initializeWithRootCmd()
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs([]string(nil))
c.Execute()
fullSetupTest("")
if rootcalled != true {
t.Errorf("Root Function was not called")
@ -471,10 +397,7 @@ func TestRunnableRootCommand(t *testing.T) {
}
func TestRootFlags(t *testing.T) {
c := initializeWithRootCmd()
c.AddCommand(cmdPrint, cmdEcho)
c.SetArgs(strings.Split("-i 17 -b", " "))
c.Execute()
fullSetupTest("-i 17 -b")
if flagbr != true {
t.Errorf("flag value should be true, %v given", flagbr)
@ -504,5 +427,56 @@ func TestRootHelp(t *testing.T) {
}
checkOutputContains(t, c, "Available Commands:")
func TestFlagsBeforeCommand(t *testing.T) {
// short without space
x := fullSetupTest("-i10 echo")
if x.Error != nil {
t.Errorf("Valid Input shouldn't have errors, got:\n %q", x.Error)
}
// short (int) with equals
// It appears that pflags doesn't support this...
// Commenting out until support can be added
//x = noRRSetupTest("echo -i=10")
//if x.Error != nil {
//t.Errorf("Valid Input shouldn't have errors, got:\n %s", x.Error)
//}
// long with equals
x = noRRSetupTest("--intone=123 echo one two")
if x.Error != nil {
t.Errorf("Valid Input shouldn't have errors, got:\n %s", x.Error)
}
// With parsing error properly reported
x = fullSetupTest("-i10E echo")
if !strings.Contains(x.Output, "invalid argument \"10E\" for -i10E") {
t.Errorf("Wrong error message displayed, \n %s", x.Output)
}
//With quotes
x = fullSetupTest("-s=\"walking\" echo")
if x.Error != nil {
t.Errorf("Valid Input shouldn't have errors, got:\n %q", x.Error)
}
//With quotes and space
x = fullSetupTest("-s=\"walking fast\" echo")
if x.Error != nil {
t.Errorf("Valid Input shouldn't have errors, got:\n %q", x.Error)
}
//With inner quote
x = fullSetupTest("-s=\"walking \\\"Inner Quote\\\" fast\" echo")
if x.Error != nil {
t.Errorf("Valid Input shouldn't have errors, got:\n %q", x.Error)
}
//With quotes and space
x = fullSetupTest("-s=\"walking \\\"Inner Quote\\\" fast\" echo")
if x.Error != nil {
t.Errorf("Valid Input shouldn't have errors, got:\n %q", x.Error)
}
}

77
command.go
View File

@ -225,6 +225,45 @@ func (c *Command) resetChildrensParents() {
}
}
func stripFlags(args []string) []string {
if len(args) < 1 {
return args
}
commands := []string{}
inQuote := false
for _, y := range args {
if !inQuote {
switch {
case strings.HasPrefix(y, "\""):
inQuote = true
case strings.Contains(y, "=\""):
inQuote = true
case !strings.HasPrefix(y, "-"):
commands = append(commands, y)
}
}
if strings.HasSuffix(y, "\"") && !strings.HasSuffix(y, "\\\"") {
inQuote = false
}
}
return commands
}
func argsMinusX(args []string, x string) []string {
newargs := []string{}
for _, y := range args {
if x != y {
newargs = append(newargs, y)
}
}
return newargs
}
// find the target command given the args and command tree
// Meant to be run on the highest node. Only searches down.
func (c *Command) Find(arrs []string) (*Command, []string, error) {
@ -240,18 +279,21 @@ func (c *Command) Find(arrs []string) (*Command, []string, error) {
innerfind = func(c *Command, args []string) (*Command, []string) {
if len(args) > 0 && c.HasSubCommands() {
matches := make([]*Command, 0)
for _, cmd := range c.commands {
if cmd.Name() == args[0] { // exact name match
return innerfind(cmd, args[1:])
} else if strings.HasPrefix(cmd.Name(), args[0]) { // prefix match
matches = append(matches, cmd)
argsWOflags := stripFlags(args)
if len(argsWOflags) > 0 {
matches := make([]*Command, 0)
for _, cmd := range c.commands {
if cmd.Name() == argsWOflags[0] { // exact name match
return innerfind(cmd, argsMinusX(args, cmd.Name()))
} else if strings.HasPrefix(cmd.Name(), argsWOflags[0]) { // prefix match
matches = append(matches, cmd)
}
}
}
// only accept a single prefix match - multiple matches would be ambiguous
if len(matches) == 1 {
return innerfind(matches[0], args[1:])
// only accept a single prefix match - multiple matches would be ambiguous
if len(matches) == 1 {
return innerfind(matches[0], argsMinusX(args, argsWOflags[0]))
}
}
}
@ -314,6 +356,18 @@ func (c *Command) execute(a []string) (err error) {
}
}
func (c *Command) errorMsgFromParse() string {
s := c.flagErrorBuf.String()
x := strings.Split(s, "\n")
if len(x) > 0 {
return x[0]
} else {
return ""
}
}
// Call execute to use the args (os.Args[1:] by default)
// and run through the command tree finding appropriate matches
// for commands and then corresponding flags.
@ -352,7 +406,8 @@ func (c *Command) Execute() (err error) {
e := c.ParseFlags(args)
if e != nil {
// Flags parsing had an error.
fmt.Println(e)
//fmt.Println(e)
c.Println(c.errorMsgFromParse())
c.Usage()
return e
} else {