Check for group presence after full initialization (#1839)

Fixes #1831

By moving the check for help group existence to "ExecuteC()" we no
longer need groups to be added before AddCommand() is called.  This
provides more flexibility to developers and works better with the use
of "init()" for command creation.

Signed-off-by: Marc Khouzam <marc.khouzam@gmail.com>
This commit is contained in:
Marc Khouzam 2022-10-24 11:11:57 -04:00 committed by GitHub
parent 4b9d00dfec
commit 10cf7be997
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 100 additions and 8 deletions

View file

@ -998,6 +998,10 @@ func (c *Command) ExecuteC() (cmd *Command, err error) {
// initialize completion at the last point to allow for user overriding
c.InitDefaultCompletionCmd()
// Now that all commands have been created, let's make sure all groups
// are properly created also
c.checkCommandGroups()
args := c.args
// Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155
@ -1092,6 +1096,19 @@ func (c *Command) ValidateRequiredFlags() error {
return nil
}
// checkCommandGroups checks if a command has been added to a group that does not exists.
// If so, we panic because it indicates a coding error that should be corrected.
func (c *Command) checkCommandGroups() {
for _, sub := range c.commands {
// if Group is not defined let the developer know right away
if sub.GroupID != "" && !c.ContainsGroup(sub.GroupID) {
panic(fmt.Sprintf("group id '%s' is not defined for subcommand '%s'", sub.GroupID, sub.CommandPath()))
}
sub.checkCommandGroups()
}
}
// InitDefaultHelpFlag adds default help flag to c.
// It is called automatically by executing the c or by calling help and usage.
// If c already has help flag, it will do nothing.
@ -1218,10 +1235,6 @@ func (c *Command) AddCommand(cmds ...*Command) {
panic("Command can't be a child of itself")
}
cmds[i].parent = c
// if Group is not defined let the developer know right away
if x.GroupID != "" && !c.ContainsGroup(x.GroupID) {
panic(fmt.Sprintf("Group id '%s' is not defined for subcommand '%s'", x.GroupID, cmds[i].CommandPath()))
}
// update max lengths
usageLen := len(x.Use)
if usageLen > c.commandsMaxUseLen {

View file

@ -1862,6 +1862,84 @@ func TestAddGroup(t *testing.T) {
checkStringContains(t, output, "\nTest group\n cmd")
}
func TestWrongGroupFirstLevel(t *testing.T) {
var rootCmd = &Command{Use: "root", Short: "test", Run: emptyRun}
rootCmd.AddGroup(&Group{ID: "group", Title: "Test group"})
// Use the wrong group ID
rootCmd.AddCommand(&Command{Use: "cmd", GroupID: "wrong", Run: emptyRun})
defer func() {
if recover() == nil {
t.Errorf("The code should have panicked due to a missing group")
}
}()
_, err := executeCommand(rootCmd, "--help")
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
}
func TestWrongGroupNestedLevel(t *testing.T) {
var rootCmd = &Command{Use: "root", Short: "test", Run: emptyRun}
var childCmd = &Command{Use: "child", Run: emptyRun}
rootCmd.AddCommand(childCmd)
childCmd.AddGroup(&Group{ID: "group", Title: "Test group"})
// Use the wrong group ID
childCmd.AddCommand(&Command{Use: "cmd", GroupID: "wrong", Run: emptyRun})
defer func() {
if recover() == nil {
t.Errorf("The code should have panicked due to a missing group")
}
}()
_, err := executeCommand(rootCmd, "child", "--help")
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
}
func TestWrongGroupForHelp(t *testing.T) {
var rootCmd = &Command{Use: "root", Short: "test", Run: emptyRun}
var childCmd = &Command{Use: "child", Run: emptyRun}
rootCmd.AddCommand(childCmd)
rootCmd.AddGroup(&Group{ID: "group", Title: "Test group"})
// Use the wrong group ID
rootCmd.SetHelpCommandGroupID("wrong")
defer func() {
if recover() == nil {
t.Errorf("The code should have panicked due to a missing group")
}
}()
_, err := executeCommand(rootCmd, "--help")
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
}
func TestWrongGroupForCompletion(t *testing.T) {
var rootCmd = &Command{Use: "root", Short: "test", Run: emptyRun}
var childCmd = &Command{Use: "child", Run: emptyRun}
rootCmd.AddCommand(childCmd)
rootCmd.AddGroup(&Group{ID: "group", Title: "Test group"})
// Use the wrong group ID
rootCmd.SetCompletionCommandGroupID("wrong")
defer func() {
if recover() == nil {
t.Errorf("The code should have panicked due to a missing group")
}
}()
_, err := executeCommand(rootCmd, "--help")
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
}
func TestSetOutput(t *testing.T) {
c := &Command{}
c.SetOutput(nil)

View file

@ -492,10 +492,11 @@ around it. In fact, you can provide your own if you want.
### Grouping commands in help
Cobra supports grouping of available commands. Groups must be explicitly defined by `AddGroup` and set by
the `GroupId` element of a subcommand. The groups will appear in the same order as they are defined.
If you use the generated `help` or `completion` commands, you can set the group ids by `SetHelpCommandGroupId`
and `SetCompletionCommandGroupId`, respectively.
Cobra supports grouping of available commands in the help output. To group commands, each group must be explicitly
defined using `AddGroup()` on the parent command. Then a subcommand can be added to a group using the `GroupID` element
of that subcommand. The groups will appear in the help output in the same order as they are defined using different
calls to `AddGroup()`. If you use the generated `help` or `completion` commands, you can set their group ids using
`SetHelpCommandGroupId()` and `SetCompletionCommandGroupId()` on the root command, respectively.
### Defining your own help