mirror of
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558 lines
21 KiB
Go
558 lines
21 KiB
Go
package cobra
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import (
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"fmt"
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"os"
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"strings"
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"github.com/spf13/pflag"
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)
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const (
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// ShellCompRequestCmd is the name of the hidden command that is used to request
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// completion results from the program. It is used by the shell completion scripts.
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ShellCompRequestCmd = "__complete"
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// ShellCompNoDescRequestCmd is the name of the hidden command that is used to request
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// completion results without their description. It is used by the shell completion scripts.
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ShellCompNoDescRequestCmd = "__completeNoDesc"
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)
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// Global map of flag completion functions.
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var flagCompletionFunctions = map[*pflag.Flag]func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective){}
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// ShellCompDirective is a bit map representing the different behaviors the shell
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// can be instructed to have once completions have been provided.
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type ShellCompDirective int
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const (
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// ShellCompDirectiveError indicates an error occurred and completions should be ignored.
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ShellCompDirectiveError ShellCompDirective = 1 << iota
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// ShellCompDirectiveNoSpace indicates that the shell should not add a space
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// after the completion even if there is a single completion provided.
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ShellCompDirectiveNoSpace
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// ShellCompDirectiveNoFileComp indicates that the shell should not provide
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// file completion even when no completion is provided.
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// This currently does not work for zsh or bash < 4
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ShellCompDirectiveNoFileComp
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// ShellCompDirectiveFilterFileExt indicates that the provided completions
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// should be used as file extension filters.
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// For flags, using Command.MarkFlagFilename() and Command.MarkPersistentFlagFilename()
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// is a shortcut to using this directive explicitly. The BashCompFilenameExt
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// annotation can also be used to obtain the same behavior for flags.
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ShellCompDirectiveFilterFileExt
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// ShellCompDirectiveFilterDirs indicates that only directory names should
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// be provided in file completion. To request directory names within another
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// directory, the returned completions should specify the directory within
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// which to search. The BashCompSubdirsInDir annotation can be used to
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// obtain the same behavior but only for flags.
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ShellCompDirectiveFilterDirs
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// ===========================================================================
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// All directives using iota should be above this one.
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// For internal use.
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shellCompDirectiveMaxValue
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// ShellCompDirectiveDefault indicates to let the shell perform its default
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// behavior after completions have been provided.
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// This one must be last to avoid messing up the iota count.
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ShellCompDirectiveDefault ShellCompDirective = 0
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)
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// RegisterFlagCompletionFunc should be called to register a function to provide completion for a flag.
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func (c *Command) RegisterFlagCompletionFunc(flagName string, f func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective)) error {
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flag := c.Flag(flagName)
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if flag == nil {
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return fmt.Errorf("RegisterFlagCompletionFunc: flag '%s' does not exist", flagName)
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}
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if _, exists := flagCompletionFunctions[flag]; exists {
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return fmt.Errorf("RegisterFlagCompletionFunc: flag '%s' already registered", flagName)
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}
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flagCompletionFunctions[flag] = f
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return nil
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}
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// Returns a string listing the different directive enabled in the specified parameter
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func (d ShellCompDirective) string() string {
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var directives []string
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if d&ShellCompDirectiveError != 0 {
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directives = append(directives, "ShellCompDirectiveError")
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}
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if d&ShellCompDirectiveNoSpace != 0 {
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directives = append(directives, "ShellCompDirectiveNoSpace")
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}
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if d&ShellCompDirectiveNoFileComp != 0 {
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directives = append(directives, "ShellCompDirectiveNoFileComp")
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}
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if d&ShellCompDirectiveFilterFileExt != 0 {
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directives = append(directives, "ShellCompDirectiveFilterFileExt")
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}
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if d&ShellCompDirectiveFilterDirs != 0 {
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directives = append(directives, "ShellCompDirectiveFilterDirs")
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}
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if len(directives) == 0 {
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directives = append(directives, "ShellCompDirectiveDefault")
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}
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if d >= shellCompDirectiveMaxValue {
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return fmt.Sprintf("ERROR: unexpected ShellCompDirective value: %d", d)
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}
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return strings.Join(directives, ", ")
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}
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// Adds a special hidden command that can be used to request custom completions.
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func (c *Command) initCompleteCmd(args []string) {
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completeCmd := &Command{
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Use: fmt.Sprintf("%s [command-line]", ShellCompRequestCmd),
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Aliases: []string{ShellCompNoDescRequestCmd},
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DisableFlagsInUseLine: true,
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Hidden: true,
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DisableFlagParsing: true,
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Args: MinimumNArgs(1),
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Short: "Request shell completion choices for the specified command-line",
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Long: fmt.Sprintf("%[2]s is a special command that is used by the shell completion logic\n%[1]s",
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"to request completion choices for the specified command-line.", ShellCompRequestCmd),
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Run: func(cmd *Command, args []string) {
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finalCmd, completions, directive, err := cmd.getCompletions(args)
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if err != nil {
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CompErrorln(err.Error())
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// Keep going for multiple reasons:
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// 1- There could be some valid completions even though there was an error
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// 2- Even without completions, we need to print the directive
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}
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noDescriptions := (cmd.CalledAs() == ShellCompNoDescRequestCmd)
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for _, comp := range completions {
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if noDescriptions {
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// Remove any description that may be included following a tab character.
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comp = strings.Split(comp, "\t")[0]
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}
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// Make sure we only write the first line to the output.
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// This is needed if a description contains a linebreak.
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// Otherwise the shell scripts will interpret the other lines as new flags
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// and could therefore provide a wrong completion.
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comp = strings.Split(comp, "\n")[0]
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// Finally trim the completion. This is especially important to get rid
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// of a trailing tab when there are no description following it.
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// For example, a sub-command without a description should not be completed
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// with a tab at the end (or else zsh will show a -- following it
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// although there is no description).
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comp = strings.TrimSpace(comp)
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// Print each possible completion to stdout for the completion script to consume.
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fmt.Fprintln(finalCmd.OutOrStdout(), comp)
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}
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if directive >= shellCompDirectiveMaxValue {
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directive = ShellCompDirectiveDefault
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}
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// As the last printout, print the completion directive for the completion script to parse.
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// The directive integer must be that last character following a single colon (:).
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// The completion script expects :<directive>
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fmt.Fprintf(finalCmd.OutOrStdout(), ":%d\n", directive)
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// Print some helpful info to stderr for the user to understand.
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// Output from stderr must be ignored by the completion script.
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fmt.Fprintf(finalCmd.ErrOrStderr(), "Completion ended with directive: %s\n", directive.string())
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},
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}
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c.AddCommand(completeCmd)
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subCmd, _, err := c.Find(args)
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if err != nil || subCmd.Name() != ShellCompRequestCmd {
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// Only create this special command if it is actually being called.
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// This reduces possible side-effects of creating such a command;
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// for example, having this command would cause problems to a
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// cobra program that only consists of the root command, since this
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// command would cause the root command to suddenly have a subcommand.
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c.RemoveCommand(completeCmd)
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}
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}
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func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDirective, error) {
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// The last argument, which is not completely typed by the user,
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// should not be part of the list of arguments
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toComplete := args[len(args)-1]
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trimmedArgs := args[:len(args)-1]
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var finalCmd *Command
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var finalArgs []string
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var err error
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// Find the real command for which completion must be performed
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// check if we need to traverse here to parse local flags on parent commands
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if c.Root().TraverseChildren {
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finalCmd, finalArgs, err = c.Root().Traverse(trimmedArgs)
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} else {
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finalCmd, finalArgs, err = c.Root().Find(trimmedArgs)
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}
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if err != nil {
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// Unable to find the real command. E.g., <program> someInvalidCmd <TAB>
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return c, []string{}, ShellCompDirectiveDefault, fmt.Errorf("Unable to find a command for arguments: %v", trimmedArgs)
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}
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// Check if we are doing flag value completion before parsing the flags.
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// This is important because if we are completing a flag value, we need to also
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// remove the flag name argument from the list of finalArgs or else the parsing
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// could fail due to an invalid value (incomplete) for the flag.
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flag, finalArgs, toComplete, err := checkIfFlagCompletion(finalCmd, finalArgs, toComplete)
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if err != nil {
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// Error while attempting to parse flags
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return finalCmd, []string{}, ShellCompDirectiveDefault, err
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}
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// Parse the flags early so we can check if required flags are set
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if err = finalCmd.ParseFlags(finalArgs); err != nil {
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return finalCmd, []string{}, ShellCompDirectiveDefault, fmt.Errorf("Error while parsing flags from args %v: %s", finalArgs, err.Error())
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}
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if flag != nil {
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// Check if we are completing a flag value subject to annotations
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if validExts, present := flag.Annotations[BashCompFilenameExt]; present {
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if len(validExts) != 0 {
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// File completion filtered by extensions
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return finalCmd, validExts, ShellCompDirectiveFilterFileExt, nil
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}
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// The annotation requests simple file completion. There is no reason to do
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// that since it is the default behavior anyway. Let's ignore this annotation
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// in case the program also registered a completion function for this flag.
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// Even though it is a mistake on the program's side, let's be nice when we can.
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}
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if subDir, present := flag.Annotations[BashCompSubdirsInDir]; present {
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if len(subDir) == 1 {
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// Directory completion from within a directory
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return finalCmd, subDir, ShellCompDirectiveFilterDirs, nil
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}
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// Directory completion
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return finalCmd, []string{}, ShellCompDirectiveFilterDirs, nil
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}
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}
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// When doing completion of a flag name, as soon as an argument starts with
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// a '-' we know it is a flag. We cannot use isFlagArg() here as it requires
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// the flag name to be complete
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if flag == nil && len(toComplete) > 0 && toComplete[0] == '-' && !strings.Contains(toComplete, "=") {
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var completions []string
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// First check for required flags
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completions = completeRequireFlags(finalCmd, toComplete)
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// If we have not found any required flags, only then can we show regular flags
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if len(completions) == 0 {
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doCompleteFlags := func(flag *pflag.Flag) {
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if !flag.Changed ||
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strings.Contains(flag.Value.Type(), "Slice") ||
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strings.Contains(flag.Value.Type(), "Array") {
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// If the flag is not already present, or if it can be specified multiple times (Array or Slice)
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// we suggest it as a completion
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completions = append(completions, getFlagNameCompletions(flag, toComplete)...)
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}
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}
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// We cannot use finalCmd.Flags() because we may not have called ParsedFlags() for commands
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// that have set DisableFlagParsing; it is ParseFlags() that merges the inherited and
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// non-inherited flags.
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finalCmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) {
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doCompleteFlags(flag)
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})
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finalCmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
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doCompleteFlags(flag)
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})
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}
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directive := ShellCompDirectiveNoFileComp
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if len(completions) == 1 && strings.HasSuffix(completions[0], "=") {
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// If there is a single completion, the shell usually adds a space
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// after the completion. We don't want that if the flag ends with an =
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directive = ShellCompDirectiveNoSpace
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}
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return finalCmd, completions, directive, nil
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}
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// We only remove the flags from the arguments if DisableFlagParsing is not set.
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// This is important for commands which have requested to do their own flag completion.
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if !finalCmd.DisableFlagParsing {
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finalArgs = finalCmd.Flags().Args()
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}
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var completions []string
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directive := ShellCompDirectiveDefault
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if flag == nil {
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foundLocalNonPersistentFlag := false
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// If TraverseChildren is true on the root command we don't check for
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// local flags because we can use a local flag on a parent command
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if !finalCmd.Root().TraverseChildren {
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// Check if there are any local, non-persistent flags on the command-line
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localNonPersistentFlags := finalCmd.LocalNonPersistentFlags()
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finalCmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
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if localNonPersistentFlags.Lookup(flag.Name) != nil && flag.Changed {
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foundLocalNonPersistentFlag = true
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}
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})
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}
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// Complete subcommand names, including the help command
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if len(finalArgs) == 0 && !foundLocalNonPersistentFlag {
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// We only complete sub-commands if:
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// - there are no arguments on the command-line and
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// - there are no local, non-peristent flag on the command-line or TraverseChildren is true
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for _, subCmd := range finalCmd.Commands() {
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if subCmd.IsAvailableCommand() || subCmd == finalCmd.helpCommand {
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if strings.HasPrefix(subCmd.Name(), toComplete) {
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completions = append(completions, fmt.Sprintf("%s\t%s", subCmd.Name(), subCmd.Short))
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}
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directive = ShellCompDirectiveNoFileComp
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}
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}
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}
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// Complete required flags even without the '-' prefix
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completions = append(completions, completeRequireFlags(finalCmd, toComplete)...)
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// Always complete ValidArgs, even if we are completing a subcommand name.
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// This is for commands that have both subcommands and ValidArgs.
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if len(finalCmd.ValidArgs) > 0 {
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if len(finalArgs) == 0 {
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// ValidArgs are only for the first argument
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for _, validArg := range finalCmd.ValidArgs {
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if strings.HasPrefix(validArg, toComplete) {
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completions = append(completions, validArg)
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}
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}
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directive = ShellCompDirectiveNoFileComp
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// If no completions were found within commands or ValidArgs,
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// see if there are any ArgAliases that should be completed.
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if len(completions) == 0 {
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for _, argAlias := range finalCmd.ArgAliases {
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if strings.HasPrefix(argAlias, toComplete) {
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completions = append(completions, argAlias)
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}
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}
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}
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}
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// If there are ValidArgs specified (even if they don't match), we stop completion.
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// Only one of ValidArgs or ValidArgsFunction can be used for a single command.
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return finalCmd, completions, directive, nil
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}
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// Let the logic continue so as to add any ValidArgsFunction completions,
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// even if we already found sub-commands.
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// This is for commands that have subcommands but also specify a ValidArgsFunction.
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}
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// Find the completion function for the flag or command
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var completionFn func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective)
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if flag != nil {
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completionFn = flagCompletionFunctions[flag]
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} else {
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completionFn = finalCmd.ValidArgsFunction
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}
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if completionFn != nil {
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// Go custom completion defined for this flag or command.
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// Call the registered completion function to get the completions.
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var comps []string
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comps, directive = completionFn(finalCmd, finalArgs, toComplete)
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completions = append(completions, comps...)
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}
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return finalCmd, completions, directive, nil
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}
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func getFlagNameCompletions(flag *pflag.Flag, toComplete string) []string {
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if nonCompletableFlag(flag) {
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return []string{}
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}
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var completions []string
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flagName := "--" + flag.Name
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if strings.HasPrefix(flagName, toComplete) {
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// Flag without the =
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completions = append(completions, fmt.Sprintf("%s\t%s", flagName, flag.Usage))
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// Why suggest both long forms: --flag and --flag= ?
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// This forces the user to *always* have to type either an = or a space after the flag name.
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// Let's be nice and avoid making users have to do that.
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// Since boolean flags and shortname flags don't show the = form, let's go that route and never show it.
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// The = form will still work, we just won't suggest it.
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// This also makes the list of suggested flags shorter as we avoid all the = forms.
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//
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// if len(flag.NoOptDefVal) == 0 {
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// // Flag requires a value, so it can be suffixed with =
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// flagName += "="
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// completions = append(completions, fmt.Sprintf("%s\t%s", flagName, flag.Usage))
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// }
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}
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flagName = "-" + flag.Shorthand
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if len(flag.Shorthand) > 0 && strings.HasPrefix(flagName, toComplete) {
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completions = append(completions, fmt.Sprintf("%s\t%s", flagName, flag.Usage))
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}
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return completions
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}
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func completeRequireFlags(finalCmd *Command, toComplete string) []string {
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var completions []string
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doCompleteRequiredFlags := func(flag *pflag.Flag) {
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if _, present := flag.Annotations[BashCompOneRequiredFlag]; present {
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if !flag.Changed {
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// If the flag is not already present, we suggest it as a completion
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completions = append(completions, getFlagNameCompletions(flag, toComplete)...)
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}
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}
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}
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// We cannot use finalCmd.Flags() because we may not have called ParsedFlags() for commands
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// that have set DisableFlagParsing; it is ParseFlags() that merges the inherited and
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// non-inherited flags.
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finalCmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) {
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doCompleteRequiredFlags(flag)
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})
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finalCmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
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doCompleteRequiredFlags(flag)
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})
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return completions
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}
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func checkIfFlagCompletion(finalCmd *Command, args []string, lastArg string) (*pflag.Flag, []string, string, error) {
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if finalCmd.DisableFlagParsing {
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// We only do flag completion if we are allowed to parse flags
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// This is important for commands which have requested to do their own flag completion.
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return nil, args, lastArg, nil
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}
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var flagName string
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trimmedArgs := args
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flagWithEqual := false
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// When doing completion of a flag name, as soon as an argument starts with
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// a '-' we know it is a flag. We cannot use isFlagArg() here as that function
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// requires the flag name to be complete
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if len(lastArg) > 0 && lastArg[0] == '-' {
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if index := strings.Index(lastArg, "="); index >= 0 {
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// Flag with an =
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flagName = strings.TrimLeft(lastArg[:index], "-")
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lastArg = lastArg[index+1:]
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flagWithEqual = true
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} else {
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// Normal flag completion
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return nil, args, lastArg, nil
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}
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}
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if len(flagName) == 0 {
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if len(args) > 0 {
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prevArg := args[len(args)-1]
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if isFlagArg(prevArg) {
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// Only consider the case where the flag does not contain an =.
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// If the flag contains an = it means it has already been fully processed,
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// so we don't need to deal with it here.
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if index := strings.Index(prevArg, "="); index < 0 {
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flagName = strings.TrimLeft(prevArg, "-")
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// Remove the uncompleted flag or else there could be an error created
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// for an invalid value for that flag
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trimmedArgs = args[:len(args)-1]
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}
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}
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}
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}
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if len(flagName) == 0 {
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// Not doing flag completion
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return nil, trimmedArgs, lastArg, nil
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}
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|
flag := findFlag(finalCmd, flagName)
|
|
if flag == nil {
|
|
// Flag not supported by this command, nothing to complete
|
|
err := fmt.Errorf("Subcommand '%s' does not support flag '%s'", finalCmd.Name(), flagName)
|
|
return nil, nil, "", err
|
|
}
|
|
|
|
if !flagWithEqual {
|
|
if len(flag.NoOptDefVal) != 0 {
|
|
// We had assumed dealing with a two-word flag but the flag is a boolean flag.
|
|
// In that case, there is no value following it, so we are not really doing flag completion.
|
|
// Reset everything to do noun completion.
|
|
trimmedArgs = args
|
|
flag = nil
|
|
}
|
|
}
|
|
|
|
return flag, trimmedArgs, lastArg, nil
|
|
}
|
|
|
|
func findFlag(cmd *Command, name string) *pflag.Flag {
|
|
flagSet := cmd.Flags()
|
|
if len(name) == 1 {
|
|
// First convert the short flag into a long flag
|
|
// as the cmd.Flag() search only accepts long flags
|
|
if short := flagSet.ShorthandLookup(name); short != nil {
|
|
name = short.Name
|
|
} else {
|
|
set := cmd.InheritedFlags()
|
|
if short = set.ShorthandLookup(name); short != nil {
|
|
name = short.Name
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
return cmd.Flag(name)
|
|
}
|
|
|
|
// CompDebug prints the specified string to the same file as where the
|
|
// completion script prints its logs.
|
|
// Note that completion printouts should never be on stdout as they would
|
|
// be wrongly interpreted as actual completion choices by the completion script.
|
|
func CompDebug(msg string, printToStdErr bool) {
|
|
msg = fmt.Sprintf("[Debug] %s", msg)
|
|
|
|
// Such logs are only printed when the user has set the environment
|
|
// variable BASH_COMP_DEBUG_FILE to the path of some file to be used.
|
|
if path := os.Getenv("BASH_COMP_DEBUG_FILE"); path != "" {
|
|
f, err := os.OpenFile(path,
|
|
os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
|
|
if err == nil {
|
|
defer f.Close()
|
|
WriteStringAndCheck(f, msg)
|
|
}
|
|
}
|
|
|
|
if printToStdErr {
|
|
// Must print to stderr for this not to be read by the completion script.
|
|
fmt.Fprint(os.Stderr, msg)
|
|
}
|
|
}
|
|
|
|
// CompDebugln prints the specified string with a newline at the end
|
|
// to the same file as where the completion script prints its logs.
|
|
// Such logs are only printed when the user has set the environment
|
|
// variable BASH_COMP_DEBUG_FILE to the path of some file to be used.
|
|
func CompDebugln(msg string, printToStdErr bool) {
|
|
CompDebug(fmt.Sprintf("%s\n", msg), printToStdErr)
|
|
}
|
|
|
|
// CompError prints the specified completion message to stderr.
|
|
func CompError(msg string) {
|
|
msg = fmt.Sprintf("[Error] %s", msg)
|
|
CompDebug(msg, true)
|
|
}
|
|
|
|
// CompErrorln prints the specified completion message to stderr with a newline at the end.
|
|
func CompErrorln(msg string) {
|
|
CompError(fmt.Sprintf("%s\n", msg))
|
|
}
|