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Update shell completion to respect flag groups (#1659)
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Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

Co-authored-by: Marc Khouzam <marc.khouzam@montreal.ca>
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@marckhouzam
marckhouzam and marckhouzam authored Jun 21, 2022
1 parent b9ca594 commit 5f2ec3c
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Showing 3 changed files with 238 additions and 0 deletions.
3 changes: 3 additions & 0 deletions completions.go
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Original file line number Diff line number Diff line change
Expand Up @@ -325,6 +325,9 @@ func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDi
var completions []string
var directive ShellCompDirective

// Enforce flag groups before doing flag completions
finalCmd.enforceFlagGroupsForCompletion()

// Note that we want to perform flagname completion even if finalCmd.DisableFlagParsing==true;
// doing this allows for completion of persistent flag names even for commands that disable flag parsing.
//
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186 changes: 186 additions & 0 deletions completions_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2691,3 +2691,189 @@ func TestFixedCompletions(t *testing.T) {
t.Errorf("expected: %q, got: %q", expected, output)
}
}

func TestCompletionForGroupedFlags(t *testing.T) {
getCmd := func() *Command {
rootCmd := &Command{
Use: "root",
Run: emptyRun,
}
childCmd := &Command{
Use: "child",
ValidArgsFunction: func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
return []string{"subArg"}, ShellCompDirectiveNoFileComp
},
Run: emptyRun,
}
rootCmd.AddCommand(childCmd)

rootCmd.PersistentFlags().Int("ingroup1", -1, "ingroup1")
rootCmd.PersistentFlags().String("ingroup2", "", "ingroup2")

childCmd.Flags().Bool("ingroup3", false, "ingroup3")
childCmd.Flags().Bool("nogroup", false, "nogroup")

// Add flags to a group
childCmd.MarkFlagsRequiredTogether("ingroup1", "ingroup2", "ingroup3")

return rootCmd
}

// Each test case uses a unique command from the function above.
testcases := []struct {
desc string
args []string
expectedOutput string
}{
{
desc: "flags in group not suggested without - prefix",
args: []string{"child", ""},
expectedOutput: strings.Join([]string{
"subArg",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "flags in group suggested with - prefix",
args: []string{"child", "-"},
expectedOutput: strings.Join([]string{
"--ingroup1",
"--ingroup2",
"--ingroup3",
"--nogroup",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "when flag in group present, other flags in group suggested even without - prefix",
args: []string{"child", "--ingroup2", "value", ""},
expectedOutput: strings.Join([]string{
"--ingroup1",
"--ingroup3",
"subArg",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "when all flags in group present, flags not suggested without - prefix",
args: []string{"child", "--ingroup1", "8", "--ingroup2", "value2", "--ingroup3", ""},
expectedOutput: strings.Join([]string{
"subArg",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "group ignored if some flags not applicable",
args: []string{"--ingroup2", "value", ""},
expectedOutput: strings.Join([]string{
"child",
"completion",
"help",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
}

for _, tc := range testcases {
t.Run(tc.desc, func(t *testing.T) {
c := getCmd()
args := []string{ShellCompNoDescRequestCmd}
args = append(args, tc.args...)
output, err := executeCommand(c, args...)
switch {
case err == nil && output != tc.expectedOutput:
t.Errorf("expected: %q, got: %q", tc.expectedOutput, output)
case err != nil:
t.Errorf("Unexpected error %q", err)
}
})
}
}

func TestCompletionForMutuallyExclusiveFlags(t *testing.T) {
getCmd := func() *Command {
rootCmd := &Command{
Use: "root",
Run: emptyRun,
}
childCmd := &Command{
Use: "child",
ValidArgsFunction: func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
return []string{"subArg"}, ShellCompDirectiveNoFileComp
},
Run: emptyRun,
}
rootCmd.AddCommand(childCmd)

rootCmd.PersistentFlags().IntSlice("ingroup1", []int{1}, "ingroup1")
rootCmd.PersistentFlags().String("ingroup2", "", "ingroup2")

childCmd.Flags().Bool("ingroup3", false, "ingroup3")
childCmd.Flags().Bool("nogroup", false, "nogroup")

// Add flags to a group
childCmd.MarkFlagsMutuallyExclusive("ingroup1", "ingroup2", "ingroup3")

return rootCmd
}

// Each test case uses a unique command from the function above.
testcases := []struct {
desc string
args []string
expectedOutput string
}{
{
desc: "flags in mutually exclusive group not suggested without the - prefix",
args: []string{"child", ""},
expectedOutput: strings.Join([]string{
"subArg",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "flags in mutually exclusive group suggested with the - prefix",
args: []string{"child", "-"},
expectedOutput: strings.Join([]string{
"--ingroup1",
"--ingroup2",
"--ingroup3",
"--nogroup",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "when flag in mutually exclusive group present, other flags in group not suggested even with the - prefix",
args: []string{"child", "--ingroup1", "8", "-"},
expectedOutput: strings.Join([]string{
"--ingroup1", // Should be suggested again since it is a slice
"--nogroup",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
{
desc: "group ignored if some flags not applicable",
args: []string{"--ingroup1", "8", "-"},
expectedOutput: strings.Join([]string{
"--ingroup1",
"--ingroup2",
":4",
"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n"),
},
}

for _, tc := range testcases {
t.Run(tc.desc, func(t *testing.T) {
c := getCmd()
args := []string{ShellCompNoDescRequestCmd}
args = append(args, tc.args...)
output, err := executeCommand(c, args...)
switch {
case err == nil && output != tc.expectedOutput:
t.Errorf("expected: %q, got: %q", tc.expectedOutput, output)
case err != nil:
t.Errorf("Unexpected error %q", err)
}
})
}
}
49 changes: 49 additions & 0 deletions flag_groups.go
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Original file line number Diff line number Diff line change
Expand Up @@ -172,3 +172,52 @@ func sortedKeys(m map[string]map[string]bool) []string {
sort.Strings(keys)
return keys
}

// enforceFlagGroupsForCompletion will do the following:
// - when a flag in a group is present, other flags in the group will be marked required
// - when a flag in a mutually exclusive group is present, other flags in the group will be marked as hidden
// This allows the standard completion logic to behave appropriately for flag groups
func (c *Command) enforceFlagGroupsForCompletion() {
if c.DisableFlagParsing {
return
}

flags := c.Flags()
groupStatus := map[string]map[string]bool{}
mutuallyExclusiveGroupStatus := map[string]map[string]bool{}
c.Flags().VisitAll(func(pflag *flag.Flag) {
processFlagForGroupAnnotation(flags, pflag, requiredAsGroup, groupStatus)
processFlagForGroupAnnotation(flags, pflag, mutuallyExclusive, mutuallyExclusiveGroupStatus)
})

// If a flag that is part of a group is present, we make all the other flags
// of that group required so that the shell completion suggests them automatically
for flagList, flagnameAndStatus := range groupStatus {
for _, isSet := range flagnameAndStatus {
if isSet {
// One of the flags of the group is set, mark the other ones as required
for _, fName := range strings.Split(flagList, " ") {
_ = c.MarkFlagRequired(fName)
}
}
}
}

// If a flag that is mutually exclusive to others is present, we hide the other
// flags of that group so the shell completion does not suggest them
for flagList, flagnameAndStatus := range mutuallyExclusiveGroupStatus {
for flagName, isSet := range flagnameAndStatus {
if isSet {
// One of the flags of the mutually exclusive group is set, mark the other ones as hidden
// Don't mark the flag that is already set as hidden because it may be an
// array or slice flag and therefore must continue being suggested
for _, fName := range strings.Split(flagList, " ") {
if fName != flagName {
flag := c.Flags().Lookup(fName)
flag.Hidden = true
}
}
}
}
}
}

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