1292 lines
35 KiB
Go
1292 lines
35 KiB
Go
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// Copyright © 2013 Steve Francia <spf@spf13.com>.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//Package cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
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//In addition to providing an interface, Cobra simultaneously provides a controller to organize your application code.
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package cobra
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"sort"
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"strings"
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flag "github.com/spf13/pflag"
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)
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// Command is just that, a command for your application.
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// eg. 'go run' ... 'run' is the command. Cobra requires
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// you to define the usage and description as part of your command
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// definition to ensure usability.
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type Command struct {
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// Name is the command name, usually the executable's name.
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name string
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// The one-line usage message.
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Use string
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// An array of aliases that can be used instead of the first word in Use.
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Aliases []string
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// An array of command names for which this command will be suggested - similar to aliases but only suggests.
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SuggestFor []string
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// The short description shown in the 'help' output.
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Short string
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// The long message shown in the 'help <this-command>' output.
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Long string
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// Examples of how to use the command
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Example string
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// List of all valid non-flag arguments that are accepted in bash completions
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ValidArgs []string
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// List of aliases for ValidArgs. These are not suggested to the user in the bash
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// completion, but accepted if entered manually.
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ArgAliases []string
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// Custom functions used by the bash autocompletion generator
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BashCompletionFunction string
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// Is this command deprecated and should print this string when used?
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Deprecated string
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// Is this command hidden and should NOT show up in the list of available commands?
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Hidden bool
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// Full set of flags
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flags *flag.FlagSet
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// Set of flags childrens of this command will inherit
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pflags *flag.FlagSet
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// Flags that are declared specifically by this command (not inherited).
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lflags *flag.FlagSet
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// SilenceErrors is an option to quiet errors down stream
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SilenceErrors bool
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// Silence Usage is an option to silence usage when an error occurs.
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SilenceUsage bool
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// The *Run functions are executed in the following order:
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// * PersistentPreRun()
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// * PreRun()
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// * Run()
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// * PostRun()
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// * PersistentPostRun()
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// All functions get the same args, the arguments after the command name
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// PersistentPreRun: children of this command will inherit and execute
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PersistentPreRun func(cmd *Command, args []string)
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// PersistentPreRunE: PersistentPreRun but returns an error
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PersistentPreRunE func(cmd *Command, args []string) error
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// PreRun: children of this command will not inherit.
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PreRun func(cmd *Command, args []string)
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// PreRunE: PreRun but returns an error
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PreRunE func(cmd *Command, args []string) error
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// Run: Typically the actual work function. Most commands will only implement this
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Run func(cmd *Command, args []string)
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// RunE: Run but returns an error
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RunE func(cmd *Command, args []string) error
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// PostRun: run after the Run command.
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PostRun func(cmd *Command, args []string)
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// PostRunE: PostRun but returns an error
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PostRunE func(cmd *Command, args []string) error
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// PersistentPostRun: children of this command will inherit and execute after PostRun
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PersistentPostRun func(cmd *Command, args []string)
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// PersistentPostRunE: PersistentPostRun but returns an error
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PersistentPostRunE func(cmd *Command, args []string) error
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// DisableAutoGenTag remove
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DisableAutoGenTag bool
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// Commands is the list of commands supported by this program.
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commands []*Command
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// Parent Command for this command
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parent *Command
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// max lengths of commands' string lengths for use in padding
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commandsMaxUseLen int
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commandsMaxCommandPathLen int
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commandsMaxNameLen int
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// is commands slice are sorted or not
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commandsAreSorted bool
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flagErrorBuf *bytes.Buffer
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args []string // actual args parsed from flags
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output *io.Writer // out writer if set in SetOutput(w)
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usageFunc func(*Command) error // Usage can be defined by application
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usageTemplate string // Can be defined by Application
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flagErrorFunc func(*Command, error) error
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helpTemplate string // Can be defined by Application
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helpFunc func(*Command, []string) // Help can be defined by application
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helpCommand *Command // The help command
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// The global normalization function that we can use on every pFlag set and children commands
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globNormFunc func(f *flag.FlagSet, name string) flag.NormalizedName
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// Disable the suggestions based on Levenshtein distance that go along with 'unknown command' messages
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DisableSuggestions bool
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// If displaying suggestions, allows to set the minimum levenshtein distance to display, must be > 0
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SuggestionsMinimumDistance int
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// Disable the flag parsing. If this is true all flags will be passed to the command as arguments.
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DisableFlagParsing bool
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}
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// os.Args[1:] by default, if desired, can be overridden
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// particularly useful when testing.
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func (c *Command) SetArgs(a []string) {
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c.args = a
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}
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// SetOutput sets the destination for usage and error messages.
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// If output is nil, os.Stderr is used.
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func (c *Command) SetOutput(output io.Writer) {
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c.output = &output
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}
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// Usage can be defined by application.
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func (c *Command) SetUsageFunc(f func(*Command) error) {
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c.usageFunc = f
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}
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// Can be defined by Application.
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func (c *Command) SetUsageTemplate(s string) {
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c.usageTemplate = s
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}
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// SetFlagErrorFunc sets a function to generate an error when flag parsing
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// fails
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func (c *Command) SetFlagErrorFunc(f func(*Command, error) error) {
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c.flagErrorFunc = f
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}
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// Can be defined by Application
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func (c *Command) SetHelpFunc(f func(*Command, []string)) {
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c.helpFunc = f
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}
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func (c *Command) SetHelpCommand(cmd *Command) {
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c.helpCommand = cmd
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}
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// Can be defined by Application.
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func (c *Command) SetHelpTemplate(s string) {
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c.helpTemplate = s
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}
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// SetGlobalNormalizationFunc sets a normalization function to all flag sets and also to child commands.
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// The user should not have a cyclic dependency on commands.
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func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string) flag.NormalizedName) {
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c.Flags().SetNormalizeFunc(n)
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c.PersistentFlags().SetNormalizeFunc(n)
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c.globNormFunc = n
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for _, command := range c.commands {
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command.SetGlobalNormalizationFunc(n)
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}
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}
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func (c *Command) OutOrStdout() io.Writer {
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return c.getOut(os.Stdout)
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}
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func (c *Command) OutOrStderr() io.Writer {
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return c.getOut(os.Stderr)
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}
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func (c *Command) getOut(def io.Writer) io.Writer {
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if c.output != nil {
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return *c.output
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}
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if c.HasParent() {
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return c.parent.getOut(def)
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}
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return def
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}
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// UsageFunc returns either the function set by SetUsageFunc for this command
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// or a parent, or it returns a default usage function.
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func (c *Command) UsageFunc() (f func(*Command) error) {
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if c.usageFunc != nil {
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return c.usageFunc
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}
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if c.HasParent() {
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return c.parent.UsageFunc()
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}
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return func(c *Command) error {
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c.mergePersistentFlags()
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err := tmpl(c.OutOrStderr(), c.UsageTemplate(), c)
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if err != nil {
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c.Println(err)
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}
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return err
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}
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}
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// Usage puts out the usage for the command.
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// Used when a user provides invalid input.
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// Can be defined by user by overriding UsageFunc.
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func (c *Command) Usage() error {
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return c.UsageFunc()(c)
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}
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// HelpFunc returns either the function set by SetHelpFunc for this command
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// or a parent, or it returns a function with default help behavior.
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func (c *Command) HelpFunc() func(*Command, []string) {
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if helpFunc := c.checkHelpFunc(); helpFunc != nil {
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return helpFunc
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}
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return func(*Command, []string) {
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c.mergePersistentFlags()
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err := tmpl(c.OutOrStdout(), c.HelpTemplate(), c)
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if err != nil {
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c.Println(err)
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}
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}
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}
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// checkHelpFunc checks if there is helpFunc in ancestors of c.
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func (c *Command) checkHelpFunc() func(*Command, []string) {
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if c == nil {
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return nil
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}
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if c.helpFunc != nil {
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return c.helpFunc
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}
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if c.HasParent() {
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return c.parent.checkHelpFunc()
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}
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return nil
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}
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// Help puts out the help for the command.
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// Used when a user calls help [command].
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// Can be defined by user by overriding HelpFunc.
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func (c *Command) Help() error {
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c.HelpFunc()(c, []string{})
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return nil
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}
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func (c *Command) UsageString() string {
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tmpOutput := c.output
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bb := new(bytes.Buffer)
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c.SetOutput(bb)
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c.Usage()
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c.output = tmpOutput
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return bb.String()
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}
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// FlagErrorFunc returns either the function set by SetFlagErrorFunc for this
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// command or a parent, or it returns a function which returns the original
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// error.
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func (c *Command) FlagErrorFunc() (f func(*Command, error) error) {
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if c.flagErrorFunc != nil {
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return c.flagErrorFunc
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}
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if c.HasParent() {
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return c.parent.FlagErrorFunc()
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}
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return func(c *Command, err error) error {
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return err
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}
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}
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var minUsagePadding = 25
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func (c *Command) UsagePadding() int {
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if c.parent == nil || minUsagePadding > c.parent.commandsMaxUseLen {
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return minUsagePadding
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}
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return c.parent.commandsMaxUseLen
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}
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var minCommandPathPadding = 11
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//
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func (c *Command) CommandPathPadding() int {
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if c.parent == nil || minCommandPathPadding > c.parent.commandsMaxCommandPathLen {
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return minCommandPathPadding
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}
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return c.parent.commandsMaxCommandPathLen
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}
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var minNamePadding = 11
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func (c *Command) NamePadding() int {
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if c.parent == nil || minNamePadding > c.parent.commandsMaxNameLen {
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return minNamePadding
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}
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return c.parent.commandsMaxNameLen
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}
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func (c *Command) UsageTemplate() string {
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if c.usageTemplate != "" {
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return c.usageTemplate
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}
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if c.HasParent() {
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return c.parent.UsageTemplate()
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}
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return `Usage:{{if .Runnable}}
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{{if .HasAvailableFlags}}{{appendIfNotPresent .UseLine "[flags]"}}{{else}}{{.UseLine}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
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{{ .CommandPath}} [command]{{end}}{{if gt .Aliases 0}}
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Aliases:
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{{.NameAndAliases}}
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{{end}}{{if .HasExample}}
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Examples:
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{{ .Example }}{{end}}{{ if .HasAvailableSubCommands}}
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Available Commands:{{range .Commands}}{{if .IsAvailableCommand}}
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{{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasAvailableLocalFlags}}
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Flags:
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{{.LocalFlags.FlagUsages | trimRightSpace}}{{end}}{{ if .HasAvailableInheritedFlags}}
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Global Flags:
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{{.InheritedFlags.FlagUsages | trimRightSpace}}{{end}}{{if .HasHelpSubCommands}}
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Additional help topics:{{range .Commands}}{{if .IsHelpCommand}}
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{{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasAvailableSubCommands }}
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Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}
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`
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}
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func (c *Command) HelpTemplate() string {
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if c.helpTemplate != "" {
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return c.helpTemplate
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}
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if c.HasParent() {
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return c.parent.HelpTemplate()
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}
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return `{{with or .Long .Short }}{{. | trim}}
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{{end}}{{if or .Runnable .HasSubCommands}}{{.UsageString}}{{end}}`
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}
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// Really only used when casting a command to a commander.
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func (c *Command) resetChildrensParents() {
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for _, x := range c.commands {
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x.parent = c
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}
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}
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// Test if the named flag is a boolean flag.
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func isBooleanFlag(name string, f *flag.FlagSet) bool {
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flag := f.Lookup(name)
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if flag == nil {
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return false
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}
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return flag.Value.Type() == "bool"
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}
|
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// Test if the named flag is a boolean flag.
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func isBooleanShortFlag(name string, f *flag.FlagSet) bool {
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result := false
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f.VisitAll(func(f *flag.Flag) {
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if f.Shorthand == name && f.Value.Type() == "bool" {
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result = true
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}
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})
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return result
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}
|
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func stripFlags(args []string, c *Command) []string {
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if len(args) < 1 {
|
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return args
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}
|
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c.mergePersistentFlags()
|
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commands := []string{}
|
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|
|
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inQuote := false
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inFlag := false
|
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for _, y := range args {
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if !inQuote {
|
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switch {
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case strings.HasPrefix(y, "\""):
|
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inQuote = true
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case strings.Contains(y, "=\""):
|
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inQuote = true
|
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case strings.HasPrefix(y, "--") && !strings.Contains(y, "="):
|
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// TODO: this isn't quite right, we should really check ahead for 'true' or 'false'
|
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inFlag = !isBooleanFlag(y[2:], c.Flags())
|
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case strings.HasPrefix(y, "-") && !strings.Contains(y, "=") && len(y) == 2 && !isBooleanShortFlag(y[1:], c.Flags()):
|
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inFlag = true
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case inFlag:
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inFlag = false
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case y == "":
|
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|
// strip empty commands, as the go tests expect this to be ok....
|
||
|
case !strings.HasPrefix(y, "-"):
|
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commands = append(commands, y)
|
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|
inFlag = false
|
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}
|
||
|
}
|
||
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|
||
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if strings.HasSuffix(y, "\"") && !strings.HasSuffix(y, "\\\"") {
|
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|
inQuote = false
|
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}
|
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}
|
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|
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return commands
|
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}
|
||
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|
||
|
// argsMinusFirstX removes only the first x from args. Otherwise, commands that look like
|
||
|
// openshift admin policy add-role-to-user admin my-user, lose the admin argument (arg[4]).
|
||
|
func argsMinusFirstX(args []string, x string) []string {
|
||
|
for i, y := range args {
|
||
|
if x == y {
|
||
|
ret := []string{}
|
||
|
ret = append(ret, args[:i]...)
|
||
|
ret = append(ret, args[i+1:]...)
|
||
|
return ret
|
||
|
}
|
||
|
}
|
||
|
return args
|
||
|
}
|
||
|
|
||
|
// 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(args []string) (*Command, []string, error) {
|
||
|
if c == nil {
|
||
|
return nil, nil, fmt.Errorf("Called find() on a nil Command")
|
||
|
}
|
||
|
|
||
|
var innerfind func(*Command, []string) (*Command, []string)
|
||
|
|
||
|
innerfind = func(c *Command, innerArgs []string) (*Command, []string) {
|
||
|
argsWOflags := stripFlags(innerArgs, c)
|
||
|
if len(argsWOflags) == 0 {
|
||
|
return c, innerArgs
|
||
|
}
|
||
|
nextSubCmd := argsWOflags[0]
|
||
|
matches := make([]*Command, 0)
|
||
|
for _, cmd := range c.commands {
|
||
|
if cmd.Name() == nextSubCmd || cmd.HasAlias(nextSubCmd) { // exact name or alias match
|
||
|
return innerfind(cmd, argsMinusFirstX(innerArgs, nextSubCmd))
|
||
|
}
|
||
|
if EnablePrefixMatching {
|
||
|
if strings.HasPrefix(cmd.Name(), nextSubCmd) { // prefix match
|
||
|
matches = append(matches, cmd)
|
||
|
}
|
||
|
for _, x := range cmd.Aliases {
|
||
|
if strings.HasPrefix(x, nextSubCmd) {
|
||
|
matches = append(matches, cmd)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// only accept a single prefix match - multiple matches would be ambiguous
|
||
|
if len(matches) == 1 {
|
||
|
return innerfind(matches[0], argsMinusFirstX(innerArgs, argsWOflags[0]))
|
||
|
}
|
||
|
|
||
|
return c, innerArgs
|
||
|
}
|
||
|
|
||
|
commandFound, a := innerfind(c, args)
|
||
|
argsWOflags := stripFlags(a, commandFound)
|
||
|
|
||
|
// no subcommand, always take args
|
||
|
if !commandFound.HasSubCommands() {
|
||
|
return commandFound, a, nil
|
||
|
}
|
||
|
|
||
|
// root command with subcommands, do subcommand checking
|
||
|
if commandFound == c && len(argsWOflags) > 0 {
|
||
|
suggestionsString := ""
|
||
|
if !c.DisableSuggestions {
|
||
|
if c.SuggestionsMinimumDistance <= 0 {
|
||
|
c.SuggestionsMinimumDistance = 2
|
||
|
}
|
||
|
if suggestions := c.SuggestionsFor(argsWOflags[0]); len(suggestions) > 0 {
|
||
|
suggestionsString += "\n\nDid you mean this?\n"
|
||
|
for _, s := range suggestions {
|
||
|
suggestionsString += fmt.Sprintf("\t%v\n", s)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return commandFound, a, fmt.Errorf("unknown command %q for %q%s", argsWOflags[0], commandFound.CommandPath(), suggestionsString)
|
||
|
}
|
||
|
|
||
|
return commandFound, a, nil
|
||
|
}
|
||
|
|
||
|
func (c *Command) SuggestionsFor(typedName string) []string {
|
||
|
suggestions := []string{}
|
||
|
for _, cmd := range c.commands {
|
||
|
if cmd.IsAvailableCommand() {
|
||
|
levenshteinDistance := ld(typedName, cmd.Name(), true)
|
||
|
suggestByLevenshtein := levenshteinDistance <= c.SuggestionsMinimumDistance
|
||
|
suggestByPrefix := strings.HasPrefix(strings.ToLower(cmd.Name()), strings.ToLower(typedName))
|
||
|
if suggestByLevenshtein || suggestByPrefix {
|
||
|
suggestions = append(suggestions, cmd.Name())
|
||
|
}
|
||
|
for _, explicitSuggestion := range cmd.SuggestFor {
|
||
|
if strings.EqualFold(typedName, explicitSuggestion) {
|
||
|
suggestions = append(suggestions, cmd.Name())
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return suggestions
|
||
|
}
|
||
|
|
||
|
func (c *Command) VisitParents(fn func(*Command)) {
|
||
|
var traverse func(*Command) *Command
|
||
|
|
||
|
traverse = func(x *Command) *Command {
|
||
|
if x != c {
|
||
|
fn(x)
|
||
|
}
|
||
|
if x.HasParent() {
|
||
|
return traverse(x.parent)
|
||
|
}
|
||
|
return x
|
||
|
}
|
||
|
traverse(c)
|
||
|
}
|
||
|
|
||
|
func (c *Command) Root() *Command {
|
||
|
var findRoot func(*Command) *Command
|
||
|
|
||
|
findRoot = func(x *Command) *Command {
|
||
|
if x.HasParent() {
|
||
|
return findRoot(x.parent)
|
||
|
}
|
||
|
return x
|
||
|
}
|
||
|
|
||
|
return findRoot(c)
|
||
|
}
|
||
|
|
||
|
// ArgsLenAtDash will return the length of f.Args at the moment when a -- was
|
||
|
// found during arg parsing. This allows your program to know which args were
|
||
|
// before the -- and which came after. (Description from
|
||
|
// https://godoc.org/github.com/spf13/pflag#FlagSet.ArgsLenAtDash).
|
||
|
func (c *Command) ArgsLenAtDash() int {
|
||
|
return c.Flags().ArgsLenAtDash()
|
||
|
}
|
||
|
|
||
|
func (c *Command) execute(a []string) (err error) {
|
||
|
if c == nil {
|
||
|
return fmt.Errorf("Called Execute() on a nil Command")
|
||
|
}
|
||
|
|
||
|
if len(c.Deprecated) > 0 {
|
||
|
c.Printf("Command %q is deprecated, %s\n", c.Name(), c.Deprecated)
|
||
|
}
|
||
|
|
||
|
// initialize help flag as the last point possible to allow for user
|
||
|
// overriding
|
||
|
c.initHelpFlag()
|
||
|
|
||
|
err = c.ParseFlags(a)
|
||
|
if err != nil {
|
||
|
return c.FlagErrorFunc()(c, err)
|
||
|
}
|
||
|
// If help is called, regardless of other flags, return we want help
|
||
|
// Also say we need help if the command isn't runnable.
|
||
|
helpVal, err := c.Flags().GetBool("help")
|
||
|
if err != nil {
|
||
|
// should be impossible to get here as we always declare a help
|
||
|
// flag in initHelpFlag()
|
||
|
c.Println("\"help\" flag declared as non-bool. Please correct your code")
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
if helpVal || !c.Runnable() {
|
||
|
return flag.ErrHelp
|
||
|
}
|
||
|
|
||
|
c.preRun()
|
||
|
|
||
|
argWoFlags := c.Flags().Args()
|
||
|
if c.DisableFlagParsing {
|
||
|
argWoFlags = a
|
||
|
}
|
||
|
|
||
|
for p := c; p != nil; p = p.Parent() {
|
||
|
if p.PersistentPreRunE != nil {
|
||
|
if err := p.PersistentPreRunE(c, argWoFlags); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
break
|
||
|
} else if p.PersistentPreRun != nil {
|
||
|
p.PersistentPreRun(c, argWoFlags)
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
if c.PreRunE != nil {
|
||
|
if err := c.PreRunE(c, argWoFlags); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
} else if c.PreRun != nil {
|
||
|
c.PreRun(c, argWoFlags)
|
||
|
}
|
||
|
|
||
|
if c.RunE != nil {
|
||
|
if err := c.RunE(c, argWoFlags); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
} else {
|
||
|
c.Run(c, argWoFlags)
|
||
|
}
|
||
|
if c.PostRunE != nil {
|
||
|
if err := c.PostRunE(c, argWoFlags); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
} else if c.PostRun != nil {
|
||
|
c.PostRun(c, argWoFlags)
|
||
|
}
|
||
|
for p := c; p != nil; p = p.Parent() {
|
||
|
if p.PersistentPostRunE != nil {
|
||
|
if err := p.PersistentPostRunE(c, argWoFlags); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
break
|
||
|
} else if p.PersistentPostRun != nil {
|
||
|
p.PersistentPostRun(c, argWoFlags)
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (c *Command) preRun() {
|
||
|
for _, x := range initializers {
|
||
|
x()
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (c *Command) errorMsgFromParse() string {
|
||
|
s := c.flagErrorBuf.String()
|
||
|
|
||
|
x := strings.Split(s, "\n")
|
||
|
|
||
|
if len(x) > 0 {
|
||
|
return x[0]
|
||
|
}
|
||
|
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.
|
||
|
func (c *Command) Execute() error {
|
||
|
_, err := c.ExecuteC()
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
func (c *Command) ExecuteC() (cmd *Command, err error) {
|
||
|
|
||
|
// Regardless of what command execute is called on, run on Root only
|
||
|
if c.HasParent() {
|
||
|
return c.Root().ExecuteC()
|
||
|
}
|
||
|
|
||
|
// windows hook
|
||
|
if preExecHookFn != nil {
|
||
|
preExecHookFn(c)
|
||
|
}
|
||
|
|
||
|
// initialize help as the last point possible to allow for user
|
||
|
// overriding
|
||
|
c.initHelpCmd()
|
||
|
|
||
|
var args []string
|
||
|
|
||
|
// Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155
|
||
|
if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" {
|
||
|
args = os.Args[1:]
|
||
|
} else {
|
||
|
args = c.args
|
||
|
}
|
||
|
|
||
|
cmd, flags, err := c.Find(args)
|
||
|
if err != nil {
|
||
|
// If found parse to a subcommand and then failed, talk about the subcommand
|
||
|
if cmd != nil {
|
||
|
c = cmd
|
||
|
}
|
||
|
if !c.SilenceErrors {
|
||
|
c.Println("Error:", err.Error())
|
||
|
c.Printf("Run '%v --help' for usage.\n", c.CommandPath())
|
||
|
}
|
||
|
return c, err
|
||
|
}
|
||
|
err = cmd.execute(flags)
|
||
|
if err != nil {
|
||
|
// Always show help if requested, even if SilenceErrors is in
|
||
|
// effect
|
||
|
if err == flag.ErrHelp {
|
||
|
cmd.HelpFunc()(cmd, args)
|
||
|
return cmd, nil
|
||
|
}
|
||
|
|
||
|
// If root command has SilentErrors flagged,
|
||
|
// all subcommands should respect it
|
||
|
if !cmd.SilenceErrors && !c.SilenceErrors {
|
||
|
c.Println("Error:", err.Error())
|
||
|
}
|
||
|
|
||
|
// If root command has SilentUsage flagged,
|
||
|
// all subcommands should respect it
|
||
|
if !cmd.SilenceUsage && !c.SilenceUsage {
|
||
|
c.Println(cmd.UsageString())
|
||
|
}
|
||
|
return cmd, err
|
||
|
}
|
||
|
return cmd, nil
|
||
|
}
|
||
|
|
||
|
func (c *Command) initHelpFlag() {
|
||
|
c.mergePersistentFlags()
|
||
|
if c.Flags().Lookup("help") == nil {
|
||
|
c.Flags().BoolP("help", "h", false, "help for "+c.Name())
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (c *Command) initHelpCmd() {
|
||
|
if c.helpCommand == nil {
|
||
|
if !c.HasSubCommands() {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
c.helpCommand = &Command{
|
||
|
Use: "help [command]",
|
||
|
Short: "Help about any command",
|
||
|
Long: `Help provides help for any command in the application.
|
||
|
Simply type ` + c.Name() + ` help [path to command] for full details.`,
|
||
|
PersistentPreRun: func(cmd *Command, args []string) {},
|
||
|
PersistentPostRun: func(cmd *Command, args []string) {},
|
||
|
|
||
|
Run: func(c *Command, args []string) {
|
||
|
cmd, _, e := c.Root().Find(args)
|
||
|
if cmd == nil || e != nil {
|
||
|
c.Printf("Unknown help topic %#q.", args)
|
||
|
c.Root().Usage()
|
||
|
} else {
|
||
|
cmd.Help()
|
||
|
}
|
||
|
},
|
||
|
}
|
||
|
}
|
||
|
c.AddCommand(c.helpCommand)
|
||
|
}
|
||
|
|
||
|
// Used for testing.
|
||
|
func (c *Command) ResetCommands() {
|
||
|
c.commands = nil
|
||
|
c.helpCommand = nil
|
||
|
}
|
||
|
|
||
|
// Sorts commands by their names.
|
||
|
type commandSorterByName []*Command
|
||
|
|
||
|
func (c commandSorterByName) Len() int { return len(c) }
|
||
|
func (c commandSorterByName) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
|
||
|
func (c commandSorterByName) Less(i, j int) bool { return c[i].Name() < c[j].Name() }
|
||
|
|
||
|
// Commands returns a sorted slice of child commands.
|
||
|
func (c *Command) Commands() []*Command {
|
||
|
// do not sort commands if it already sorted or sorting was disabled
|
||
|
if EnableCommandSorting && !c.commandsAreSorted {
|
||
|
sort.Sort(commandSorterByName(c.commands))
|
||
|
c.commandsAreSorted = true
|
||
|
}
|
||
|
return c.commands
|
||
|
}
|
||
|
|
||
|
// AddCommand adds one or more commands to this parent command.
|
||
|
func (c *Command) AddCommand(cmds ...*Command) {
|
||
|
for i, x := range cmds {
|
||
|
if cmds[i] == c {
|
||
|
panic("Command can't be a child of itself")
|
||
|
}
|
||
|
cmds[i].parent = c
|
||
|
// update max lengths
|
||
|
usageLen := len(x.Use)
|
||
|
if usageLen > c.commandsMaxUseLen {
|
||
|
c.commandsMaxUseLen = usageLen
|
||
|
}
|
||
|
commandPathLen := len(x.CommandPath())
|
||
|
if commandPathLen > c.commandsMaxCommandPathLen {
|
||
|
c.commandsMaxCommandPathLen = commandPathLen
|
||
|
}
|
||
|
nameLen := len(x.Name())
|
||
|
if nameLen > c.commandsMaxNameLen {
|
||
|
c.commandsMaxNameLen = nameLen
|
||
|
}
|
||
|
// If global normalization function exists, update all children
|
||
|
if c.globNormFunc != nil {
|
||
|
x.SetGlobalNormalizationFunc(c.globNormFunc)
|
||
|
}
|
||
|
c.commands = append(c.commands, x)
|
||
|
c.commandsAreSorted = false
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// RemoveCommand removes one or more commands from a parent command.
|
||
|
func (c *Command) RemoveCommand(cmds ...*Command) {
|
||
|
commands := []*Command{}
|
||
|
main:
|
||
|
for _, command := range c.commands {
|
||
|
for _, cmd := range cmds {
|
||
|
if command == cmd {
|
||
|
command.parent = nil
|
||
|
continue main
|
||
|
}
|
||
|
}
|
||
|
commands = append(commands, command)
|
||
|
}
|
||
|
c.commands = commands
|
||
|
// recompute all lengths
|
||
|
c.commandsMaxUseLen = 0
|
||
|
c.commandsMaxCommandPathLen = 0
|
||
|
c.commandsMaxNameLen = 0
|
||
|
for _, command := range c.commands {
|
||
|
usageLen := len(command.Use)
|
||
|
if usageLen > c.commandsMaxUseLen {
|
||
|
c.commandsMaxUseLen = usageLen
|
||
|
}
|
||
|
commandPathLen := len(command.CommandPath())
|
||
|
if commandPathLen > c.commandsMaxCommandPathLen {
|
||
|
c.commandsMaxCommandPathLen = commandPathLen
|
||
|
}
|
||
|
nameLen := len(command.Name())
|
||
|
if nameLen > c.commandsMaxNameLen {
|
||
|
c.commandsMaxNameLen = nameLen
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Print is a convenience method to Print to the defined output, fallback to Stderr if not set.
|
||
|
func (c *Command) Print(i ...interface{}) {
|
||
|
fmt.Fprint(c.OutOrStderr(), i...)
|
||
|
}
|
||
|
|
||
|
// Println is a convenience method to Println to the defined output, fallback to Stderr if not set.
|
||
|
func (c *Command) Println(i ...interface{}) {
|
||
|
str := fmt.Sprintln(i...)
|
||
|
c.Print(str)
|
||
|
}
|
||
|
|
||
|
// Printf is a convenience method to Printf to the defined output, fallback to Stderr if not set.
|
||
|
func (c *Command) Printf(format string, i ...interface{}) {
|
||
|
str := fmt.Sprintf(format, i...)
|
||
|
c.Print(str)
|
||
|
}
|
||
|
|
||
|
// CommandPath returns the full path to this command.
|
||
|
func (c *Command) CommandPath() string {
|
||
|
str := c.Name()
|
||
|
x := c
|
||
|
for x.HasParent() {
|
||
|
str = x.parent.Name() + " " + str
|
||
|
x = x.parent
|
||
|
}
|
||
|
return str
|
||
|
}
|
||
|
|
||
|
// UseLine puts out the full usage for a given command (including parents).
|
||
|
func (c *Command) UseLine() string {
|
||
|
str := ""
|
||
|
if c.HasParent() {
|
||
|
str = c.parent.CommandPath() + " "
|
||
|
}
|
||
|
return str + c.Use
|
||
|
}
|
||
|
|
||
|
// For use in determining which flags have been assigned to which commands
|
||
|
// and which persist.
|
||
|
func (c *Command) DebugFlags() {
|
||
|
c.Println("DebugFlags called on", c.Name())
|
||
|
var debugflags func(*Command)
|
||
|
|
||
|
debugflags = func(x *Command) {
|
||
|
if x.HasFlags() || x.HasPersistentFlags() {
|
||
|
c.Println(x.Name())
|
||
|
}
|
||
|
if x.HasFlags() {
|
||
|
x.flags.VisitAll(func(f *flag.Flag) {
|
||
|
if x.HasPersistentFlags() {
|
||
|
if x.persistentFlag(f.Name) == nil {
|
||
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [L]")
|
||
|
} else {
|
||
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [LP]")
|
||
|
}
|
||
|
} else {
|
||
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [L]")
|
||
|
}
|
||
|
})
|
||
|
}
|
||
|
if x.HasPersistentFlags() {
|
||
|
x.pflags.VisitAll(func(f *flag.Flag) {
|
||
|
if x.HasFlags() {
|
||
|
if x.flags.Lookup(f.Name) == nil {
|
||
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [P]")
|
||
|
}
|
||
|
} else {
|
||
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [P]")
|
||
|
}
|
||
|
})
|
||
|
}
|
||
|
c.Println(x.flagErrorBuf)
|
||
|
if x.HasSubCommands() {
|
||
|
for _, y := range x.commands {
|
||
|
debugflags(y)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
debugflags(c)
|
||
|
}
|
||
|
|
||
|
// Name returns the command's name: the first word in the use line.
|
||
|
func (c *Command) Name() string {
|
||
|
if c.name != "" {
|
||
|
return c.name
|
||
|
}
|
||
|
name := c.Use
|
||
|
i := strings.Index(name, " ")
|
||
|
if i >= 0 {
|
||
|
name = name[:i]
|
||
|
}
|
||
|
return name
|
||
|
}
|
||
|
|
||
|
// HasAlias determines if a given string is an alias of the command.
|
||
|
func (c *Command) HasAlias(s string) bool {
|
||
|
for _, a := range c.Aliases {
|
||
|
if a == s {
|
||
|
return true
|
||
|
}
|
||
|
}
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
func (c *Command) NameAndAliases() string {
|
||
|
return strings.Join(append([]string{c.Name()}, c.Aliases...), ", ")
|
||
|
}
|
||
|
|
||
|
func (c *Command) HasExample() bool {
|
||
|
return len(c.Example) > 0
|
||
|
}
|
||
|
|
||
|
// Runnable determines if the command is itself runnable.
|
||
|
func (c *Command) Runnable() bool {
|
||
|
return c.Run != nil || c.RunE != nil
|
||
|
}
|
||
|
|
||
|
// HasSubCommands determines if the command has children commands.
|
||
|
func (c *Command) HasSubCommands() bool {
|
||
|
return len(c.commands) > 0
|
||
|
}
|
||
|
|
||
|
// IsAvailableCommand determines if a command is available as a non-help command
|
||
|
// (this includes all non deprecated/hidden commands).
|
||
|
func (c *Command) IsAvailableCommand() bool {
|
||
|
if len(c.Deprecated) != 0 || c.Hidden {
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
if c.HasParent() && c.Parent().helpCommand == c {
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
if c.Runnable() || c.HasAvailableSubCommands() {
|
||
|
return true
|
||
|
}
|
||
|
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
// IsHelpCommand determines if a command is a 'help' command; a help command is
|
||
|
// determined by the fact that it is NOT runnable/hidden/deprecated, and has no
|
||
|
// sub commands that are runnable/hidden/deprecated.
|
||
|
func (c *Command) IsHelpCommand() bool {
|
||
|
|
||
|
// if a command is runnable, deprecated, or hidden it is not a 'help' command
|
||
|
if c.Runnable() || len(c.Deprecated) != 0 || c.Hidden {
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
// if any non-help sub commands are found, the command is not a 'help' command
|
||
|
for _, sub := range c.commands {
|
||
|
if !sub.IsHelpCommand() {
|
||
|
return false
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// the command either has no sub commands, or no non-help sub commands
|
||
|
return true
|
||
|
}
|
||
|
|
||
|
// HasHelpSubCommands determines if a command has any available 'help' sub commands
|
||
|
// that need to be shown in the usage/help default template under 'additional help
|
||
|
// topics'.
|
||
|
func (c *Command) HasHelpSubCommands() bool {
|
||
|
|
||
|
// return true on the first found available 'help' sub command
|
||
|
for _, sub := range c.commands {
|
||
|
if sub.IsHelpCommand() {
|
||
|
return true
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// the command either has no sub commands, or no available 'help' sub commands
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
// HasAvailableSubCommands determines if a command has available sub commands that
|
||
|
// need to be shown in the usage/help default template under 'available commands'.
|
||
|
func (c *Command) HasAvailableSubCommands() bool {
|
||
|
|
||
|
// return true on the first found available (non deprecated/help/hidden)
|
||
|
// sub command
|
||
|
for _, sub := range c.commands {
|
||
|
if sub.IsAvailableCommand() {
|
||
|
return true
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// the command either has no sub comamnds, or no available (non deprecated/help/hidden)
|
||
|
// sub commands
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
// HasParent determines if the command is a child command.
|
||
|
func (c *Command) HasParent() bool {
|
||
|
return c.parent != nil
|
||
|
}
|
||
|
|
||
|
// GlobalNormalizationFunc returns the global normalization function or nil if doesn't exists.
|
||
|
func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName {
|
||
|
return c.globNormFunc
|
||
|
}
|
||
|
|
||
|
// Flage returns the complete FlagSet that applies
|
||
|
// to this command (local and persistent declared here and by all parents).
|
||
|
func (c *Command) Flags() *flag.FlagSet {
|
||
|
if c.flags == nil {
|
||
|
c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
if c.flagErrorBuf == nil {
|
||
|
c.flagErrorBuf = new(bytes.Buffer)
|
||
|
}
|
||
|
c.flags.SetOutput(c.flagErrorBuf)
|
||
|
}
|
||
|
return c.flags
|
||
|
}
|
||
|
|
||
|
// LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands.
|
||
|
func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
|
||
|
persistentFlags := c.PersistentFlags()
|
||
|
|
||
|
out := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
c.LocalFlags().VisitAll(func(f *flag.Flag) {
|
||
|
if persistentFlags.Lookup(f.Name) == nil {
|
||
|
out.AddFlag(f)
|
||
|
}
|
||
|
})
|
||
|
return out
|
||
|
}
|
||
|
|
||
|
// LocalFlags returns the local FlagSet specifically set in the current command.
|
||
|
func (c *Command) LocalFlags() *flag.FlagSet {
|
||
|
c.mergePersistentFlags()
|
||
|
|
||
|
local := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
c.lflags.VisitAll(func(f *flag.Flag) {
|
||
|
local.AddFlag(f)
|
||
|
})
|
||
|
if !c.HasParent() {
|
||
|
flag.CommandLine.VisitAll(func(f *flag.Flag) {
|
||
|
if local.Lookup(f.Name) == nil {
|
||
|
local.AddFlag(f)
|
||
|
}
|
||
|
})
|
||
|
}
|
||
|
return local
|
||
|
}
|
||
|
|
||
|
// InheritedFlags returns all flags which were inherited from parents commands.
|
||
|
func (c *Command) InheritedFlags() *flag.FlagSet {
|
||
|
c.mergePersistentFlags()
|
||
|
|
||
|
inherited := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
local := c.LocalFlags()
|
||
|
|
||
|
var rmerge func(x *Command)
|
||
|
|
||
|
rmerge = func(x *Command) {
|
||
|
if x.HasPersistentFlags() {
|
||
|
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
|
||
|
if inherited.Lookup(f.Name) == nil && local.Lookup(f.Name) == nil {
|
||
|
inherited.AddFlag(f)
|
||
|
}
|
||
|
})
|
||
|
}
|
||
|
if x.HasParent() {
|
||
|
rmerge(x.parent)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if c.HasParent() {
|
||
|
rmerge(c.parent)
|
||
|
}
|
||
|
|
||
|
return inherited
|
||
|
}
|
||
|
|
||
|
// NonInheritedFlags returns all flags which were not inherited from parent commands.
|
||
|
func (c *Command) NonInheritedFlags() *flag.FlagSet {
|
||
|
return c.LocalFlags()
|
||
|
}
|
||
|
|
||
|
// PersistentFlags returns the persistent FlagSet specifically set in the current command.
|
||
|
func (c *Command) PersistentFlags() *flag.FlagSet {
|
||
|
if c.pflags == nil {
|
||
|
c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
if c.flagErrorBuf == nil {
|
||
|
c.flagErrorBuf = new(bytes.Buffer)
|
||
|
}
|
||
|
c.pflags.SetOutput(c.flagErrorBuf)
|
||
|
}
|
||
|
return c.pflags
|
||
|
}
|
||
|
|
||
|
// ResetFlags is used in testing.
|
||
|
func (c *Command) ResetFlags() {
|
||
|
c.flagErrorBuf = new(bytes.Buffer)
|
||
|
c.flagErrorBuf.Reset()
|
||
|
c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
c.flags.SetOutput(c.flagErrorBuf)
|
||
|
c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
c.pflags.SetOutput(c.flagErrorBuf)
|
||
|
}
|
||
|
|
||
|
// Does the command contain any flags (local plus persistent from the entire structure).
|
||
|
func (c *Command) HasFlags() bool {
|
||
|
return c.Flags().HasFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command contain persistent flags.
|
||
|
func (c *Command) HasPersistentFlags() bool {
|
||
|
return c.PersistentFlags().HasFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command has flags specifically declared locally.
|
||
|
func (c *Command) HasLocalFlags() bool {
|
||
|
return c.LocalFlags().HasFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command have flags inherited from its parent command.
|
||
|
func (c *Command) HasInheritedFlags() bool {
|
||
|
return c.InheritedFlags().HasFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command contain any flags (local plus persistent from the entire
|
||
|
// structure) which are not hidden or deprecated.
|
||
|
func (c *Command) HasAvailableFlags() bool {
|
||
|
return c.Flags().HasAvailableFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command contain persistent flags which are not hidden or deprecated.
|
||
|
func (c *Command) HasAvailablePersistentFlags() bool {
|
||
|
return c.PersistentFlags().HasAvailableFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command has flags specifically declared locally which are not hidden
|
||
|
// or deprecated.
|
||
|
func (c *Command) HasAvailableLocalFlags() bool {
|
||
|
return c.LocalFlags().HasAvailableFlags()
|
||
|
}
|
||
|
|
||
|
// Does the command have flags inherited from its parent command which are
|
||
|
// not hidden or deprecated.
|
||
|
func (c *Command) HasAvailableInheritedFlags() bool {
|
||
|
return c.InheritedFlags().HasAvailableFlags()
|
||
|
}
|
||
|
|
||
|
// Flag climbs up the command tree looking for matching flag.
|
||
|
func (c *Command) Flag(name string) (flag *flag.Flag) {
|
||
|
flag = c.Flags().Lookup(name)
|
||
|
|
||
|
if flag == nil {
|
||
|
flag = c.persistentFlag(name)
|
||
|
}
|
||
|
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Recursively find matching persistent flag.
|
||
|
func (c *Command) persistentFlag(name string) (flag *flag.Flag) {
|
||
|
if c.HasPersistentFlags() {
|
||
|
flag = c.PersistentFlags().Lookup(name)
|
||
|
}
|
||
|
|
||
|
if flag == nil && c.HasParent() {
|
||
|
flag = c.parent.persistentFlag(name)
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// ParseFlags parses persistent flag tree and local flags.
|
||
|
func (c *Command) ParseFlags(args []string) (err error) {
|
||
|
if c.DisableFlagParsing {
|
||
|
return nil
|
||
|
}
|
||
|
c.mergePersistentFlags()
|
||
|
err = c.Flags().Parse(args)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Parent returns a commands parent command.
|
||
|
func (c *Command) Parent() *Command {
|
||
|
return c.parent
|
||
|
}
|
||
|
|
||
|
func (c *Command) mergePersistentFlags() {
|
||
|
var rmerge func(x *Command)
|
||
|
|
||
|
// Save the set of local flags
|
||
|
if c.lflags == nil {
|
||
|
c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
||
|
if c.flagErrorBuf == nil {
|
||
|
c.flagErrorBuf = new(bytes.Buffer)
|
||
|
}
|
||
|
c.lflags.SetOutput(c.flagErrorBuf)
|
||
|
addtolocal := func(f *flag.Flag) {
|
||
|
c.lflags.AddFlag(f)
|
||
|
}
|
||
|
c.Flags().VisitAll(addtolocal)
|
||
|
c.PersistentFlags().VisitAll(addtolocal)
|
||
|
}
|
||
|
rmerge = func(x *Command) {
|
||
|
if !x.HasParent() {
|
||
|
flag.CommandLine.VisitAll(func(f *flag.Flag) {
|
||
|
if x.PersistentFlags().Lookup(f.Name) == nil {
|
||
|
x.PersistentFlags().AddFlag(f)
|
||
|
}
|
||
|
})
|
||
|
}
|
||
|
if x.HasPersistentFlags() {
|
||
|
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
|
||
|
if c.Flags().Lookup(f.Name) == nil {
|
||
|
c.Flags().AddFlag(f)
|
||
|
}
|
||
|
})
|
||
|
}
|
||
|
if x.HasParent() {
|
||
|
rmerge(x.parent)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
rmerge(c)
|
||
|
}
|