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![Paddy](/assets/img/avatar_default.png)
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
721 lines
20 KiB
Go
721 lines
20 KiB
Go
package cli
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import (
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"fmt"
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"io"
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"os"
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"regexp"
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"sort"
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"strings"
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"sync"
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"text/template"
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"github.com/armon/go-radix"
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"github.com/posener/complete"
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)
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// CLI contains the state necessary to run subcommands and parse the
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// command line arguments.
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//
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// CLI also supports nested subcommands, such as "cli foo bar". To use
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// nested subcommands, the key in the Commands mapping below contains the
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// full subcommand. In this example, it would be "foo bar".
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//
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// If you use a CLI with nested subcommands, some semantics change due to
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// ambiguities:
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//
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// * We use longest prefix matching to find a matching subcommand. This
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// means if you register "foo bar" and the user executes "cli foo qux",
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// the "foo" command will be executed with the arg "qux". It is up to
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// you to handle these args. One option is to just return the special
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// help return code `RunResultHelp` to display help and exit.
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//
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// * The help flag "-h" or "-help" will look at all args to determine
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// the help function. For example: "otto apps list -h" will show the
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// help for "apps list" but "otto apps -h" will show it for "apps".
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// In the normal CLI, only the first subcommand is used.
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//
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// * The help flag will list any subcommands that a command takes
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// as well as the command's help itself. If there are no subcommands,
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// it will note this. If the CLI itself has no subcommands, this entire
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// section is omitted.
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//
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// * Any parent commands that don't exist are automatically created as
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// no-op commands that just show help for other subcommands. For example,
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// if you only register "foo bar", then "foo" is automatically created.
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//
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type CLI struct {
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// Args is the list of command-line arguments received excluding
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// the name of the app. For example, if the command "./cli foo bar"
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// was invoked, then Args should be []string{"foo", "bar"}.
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Args []string
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// Commands is a mapping of subcommand names to a factory function
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// for creating that Command implementation. If there is a command
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// with a blank string "", then it will be used as the default command
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// if no subcommand is specified.
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//
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// If the key has a space in it, this will create a nested subcommand.
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// For example, if the key is "foo bar", then to access it our CLI
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// must be accessed with "./cli foo bar". See the docs for CLI for
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// notes on how this changes some other behavior of the CLI as well.
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//
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// The factory should be as cheap as possible, ideally only allocating
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// a struct. The factory may be called multiple times in the course
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// of a command execution and certain events such as help require the
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// instantiation of all commands. Expensive initialization should be
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// deferred to function calls within the interface implementation.
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Commands map[string]CommandFactory
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// HiddenCommands is a list of commands that are "hidden". Hidden
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// commands are not given to the help function callback and do not
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// show up in autocomplete. The values in the slice should be equivalent
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// to the keys in the command map.
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HiddenCommands []string
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// Name defines the name of the CLI.
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Name string
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// Version of the CLI.
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Version string
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// Autocomplete enables or disables subcommand auto-completion support.
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// This is enabled by default when NewCLI is called. Otherwise, this
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// must enabled explicitly.
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//
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// Autocomplete requires the "Name" option to be set on CLI. This name
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// should be set exactly to the binary name that is autocompleted.
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//
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// Autocompletion is supported via the github.com/posener/complete
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// library. This library supports bash, zsh and fish. To add support
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// for other shells, please see that library.
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//
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// AutocompleteInstall and AutocompleteUninstall are the global flag
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// names for installing and uninstalling the autocompletion handlers
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// for the user's shell. The flag should omit the hyphen(s) in front of
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// the value. Both single and double hyphens will automatically be supported
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// for the flag name. These default to `autocomplete-install` and
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// `autocomplete-uninstall` respectively.
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//
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// AutocompleteNoDefaultFlags is a boolean which controls if the default auto-
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// complete flags like -help and -version are added to the output.
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//
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// AutocompleteGlobalFlags are a mapping of global flags for
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// autocompletion. The help and version flags are automatically added.
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Autocomplete bool
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AutocompleteInstall string
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AutocompleteUninstall string
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AutocompleteNoDefaultFlags bool
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AutocompleteGlobalFlags complete.Flags
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autocompleteInstaller autocompleteInstaller // For tests
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// HelpFunc and HelpWriter are used to output help information, if
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// requested.
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//
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// HelpFunc is the function called to generate the generic help
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// text that is shown if help must be shown for the CLI that doesn't
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// pertain to a specific command.
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//
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// HelpWriter is the Writer where the help text is outputted to. If
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// not specified, it will default to Stderr.
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HelpFunc HelpFunc
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HelpWriter io.Writer
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//---------------------------------------------------------------
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// Internal fields set automatically
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once sync.Once
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autocomplete *complete.Complete
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commandTree *radix.Tree
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commandNested bool
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commandHidden map[string]struct{}
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subcommand string
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subcommandArgs []string
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topFlags []string
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// These are true when special global flags are set. We can/should
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// probably use a bitset for this one day.
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isHelp bool
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isVersion bool
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isAutocompleteInstall bool
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isAutocompleteUninstall bool
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}
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// NewClI returns a new CLI instance with sensible defaults.
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func NewCLI(app, version string) *CLI {
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return &CLI{
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Name: app,
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Version: version,
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HelpFunc: BasicHelpFunc(app),
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Autocomplete: true,
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}
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}
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// IsHelp returns whether or not the help flag is present within the
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// arguments.
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func (c *CLI) IsHelp() bool {
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c.once.Do(c.init)
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return c.isHelp
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}
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// IsVersion returns whether or not the version flag is present within the
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// arguments.
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func (c *CLI) IsVersion() bool {
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c.once.Do(c.init)
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return c.isVersion
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}
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// Run runs the actual CLI based on the arguments given.
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func (c *CLI) Run() (int, error) {
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c.once.Do(c.init)
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// If this is a autocompletion request, satisfy it. This must be called
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// first before anything else since its possible to be autocompleting
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// -help or -version or other flags and we want to show completions
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// and not actually write the help or version.
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if c.Autocomplete && c.autocomplete.Complete() {
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return 0, nil
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}
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// Just show the version and exit if instructed.
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if c.IsVersion() && c.Version != "" {
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c.HelpWriter.Write([]byte(c.Version + "\n"))
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return 0, nil
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}
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// Just print the help when only '-h' or '--help' is passed.
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if c.IsHelp() && c.Subcommand() == "" {
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c.HelpWriter.Write([]byte(c.HelpFunc(c.helpCommands(c.Subcommand())) + "\n"))
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return 0, nil
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}
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// If we're attempting to install or uninstall autocomplete then handle
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if c.Autocomplete {
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// Autocomplete requires the "Name" to be set so that we know what
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// command to setup the autocomplete on.
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if c.Name == "" {
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return 1, fmt.Errorf(
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"internal error: CLI.Name must be specified for autocomplete to work")
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}
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// If both install and uninstall flags are specified, then error
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if c.isAutocompleteInstall && c.isAutocompleteUninstall {
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return 1, fmt.Errorf(
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"Either the autocomplete install or uninstall flag may " +
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"be specified, but not both.")
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}
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// If the install flag is specified, perform the install or uninstall
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if c.isAutocompleteInstall {
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if err := c.autocompleteInstaller.Install(c.Name); err != nil {
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return 1, err
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}
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return 0, nil
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}
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if c.isAutocompleteUninstall {
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if err := c.autocompleteInstaller.Uninstall(c.Name); err != nil {
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return 1, err
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}
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return 0, nil
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}
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}
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// Attempt to get the factory function for creating the command
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// implementation. If the command is invalid or blank, it is an error.
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raw, ok := c.commandTree.Get(c.Subcommand())
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if !ok {
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c.HelpWriter.Write([]byte(c.HelpFunc(c.helpCommands(c.subcommandParent())) + "\n"))
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return 127, nil
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}
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command, err := raw.(CommandFactory)()
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if err != nil {
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return 1, err
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}
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// If we've been instructed to just print the help, then print it
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if c.IsHelp() {
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c.commandHelp(command)
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return 0, nil
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}
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// If there is an invalid flag, then error
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if len(c.topFlags) > 0 {
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c.HelpWriter.Write([]byte(
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"Invalid flags before the subcommand. If these flags are for\n" +
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"the subcommand, please put them after the subcommand.\n\n"))
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c.commandHelp(command)
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return 1, nil
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}
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code := command.Run(c.SubcommandArgs())
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if code == RunResultHelp {
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// Requesting help
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c.commandHelp(command)
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return 1, nil
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}
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return code, nil
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}
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// Subcommand returns the subcommand that the CLI would execute. For
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// example, a CLI from "--version version --help" would return a Subcommand
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// of "version"
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func (c *CLI) Subcommand() string {
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c.once.Do(c.init)
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return c.subcommand
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}
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// SubcommandArgs returns the arguments that will be passed to the
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// subcommand.
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func (c *CLI) SubcommandArgs() []string {
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c.once.Do(c.init)
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return c.subcommandArgs
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}
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// subcommandParent returns the parent of this subcommand, if there is one.
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// If there isn't on, "" is returned.
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func (c *CLI) subcommandParent() string {
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// Get the subcommand, if it is "" alread just return
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sub := c.Subcommand()
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if sub == "" {
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return sub
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}
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// Clear any trailing spaces and find the last space
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sub = strings.TrimRight(sub, " ")
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idx := strings.LastIndex(sub, " ")
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if idx == -1 {
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// No space means our parent is root
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return ""
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}
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return sub[:idx]
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}
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func (c *CLI) init() {
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if c.HelpFunc == nil {
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c.HelpFunc = BasicHelpFunc("app")
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if c.Name != "" {
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c.HelpFunc = BasicHelpFunc(c.Name)
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}
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}
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if c.HelpWriter == nil {
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c.HelpWriter = os.Stderr
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}
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// Build our hidden commands
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if len(c.HiddenCommands) > 0 {
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c.commandHidden = make(map[string]struct{})
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for _, h := range c.HiddenCommands {
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c.commandHidden[h] = struct{}{}
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}
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}
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// Build our command tree
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c.commandTree = radix.New()
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c.commandNested = false
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for k, v := range c.Commands {
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k = strings.TrimSpace(k)
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c.commandTree.Insert(k, v)
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if strings.ContainsRune(k, ' ') {
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c.commandNested = true
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}
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}
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// Go through the key and fill in any missing parent commands
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if c.commandNested {
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var walkFn radix.WalkFn
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toInsert := make(map[string]struct{})
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walkFn = func(k string, raw interface{}) bool {
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idx := strings.LastIndex(k, " ")
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if idx == -1 {
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// If there is no space, just ignore top level commands
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return false
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}
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// Trim up to that space so we can get the expected parent
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k = k[:idx]
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if _, ok := c.commandTree.Get(k); ok {
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// Yay we have the parent!
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return false
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}
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// We're missing the parent, so let's insert this
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toInsert[k] = struct{}{}
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// Call the walk function recursively so we check this one too
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return walkFn(k, nil)
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}
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// Walk!
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c.commandTree.Walk(walkFn)
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// Insert any that we're missing
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for k := range toInsert {
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var f CommandFactory = func() (Command, error) {
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return &MockCommand{
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HelpText: "This command is accessed by using one of the subcommands below.",
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RunResult: RunResultHelp,
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}, nil
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}
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c.commandTree.Insert(k, f)
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}
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}
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// Setup autocomplete if we have it enabled. We have to do this after
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// the command tree is setup so we can use the radix tree to easily find
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// all subcommands.
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if c.Autocomplete {
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c.initAutocomplete()
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}
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// Process the args
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c.processArgs()
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}
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func (c *CLI) initAutocomplete() {
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if c.AutocompleteInstall == "" {
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c.AutocompleteInstall = defaultAutocompleteInstall
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}
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if c.AutocompleteUninstall == "" {
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c.AutocompleteUninstall = defaultAutocompleteUninstall
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}
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if c.autocompleteInstaller == nil {
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c.autocompleteInstaller = &realAutocompleteInstaller{}
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}
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// Build the root command
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cmd := c.initAutocompleteSub("")
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// For the root, we add the global flags to the "Flags". This way
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// they don't show up on every command.
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if !c.AutocompleteNoDefaultFlags {
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cmd.Flags = map[string]complete.Predictor{
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"-" + c.AutocompleteInstall: complete.PredictNothing,
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"-" + c.AutocompleteUninstall: complete.PredictNothing,
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"-help": complete.PredictNothing,
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"-version": complete.PredictNothing,
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}
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}
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cmd.GlobalFlags = c.AutocompleteGlobalFlags
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c.autocomplete = complete.New(c.Name, cmd)
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}
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// initAutocompleteSub creates the complete.Command for a subcommand with
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// the given prefix. This will continue recursively for all subcommands.
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// The prefix "" (empty string) can be used for the root command.
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func (c *CLI) initAutocompleteSub(prefix string) complete.Command {
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var cmd complete.Command
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walkFn := func(k string, raw interface{}) bool {
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// Ignore the empty key which can be present for default commands.
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if k == "" {
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return false
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}
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// Keep track of the full key so that we can nest further if necessary
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fullKey := k
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if len(prefix) > 0 {
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// If we have a prefix, trim the prefix + 1 (for the space)
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// Example: turns "sub one" to "one" with prefix "sub"
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k = k[len(prefix)+1:]
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}
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if idx := strings.Index(k, " "); idx >= 0 {
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// If there is a space, we trim up to the space. This turns
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// "sub sub2 sub3" into "sub". The prefix trim above will
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// trim our current depth properly.
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k = k[:idx]
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}
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if _, ok := cmd.Sub[k]; ok {
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// If we already tracked this subcommand then ignore
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return false
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}
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// If the command is hidden, don't record it at all
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if _, ok := c.commandHidden[fullKey]; ok {
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return false
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}
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if cmd.Sub == nil {
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cmd.Sub = complete.Commands(make(map[string]complete.Command))
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}
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subCmd := c.initAutocompleteSub(fullKey)
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// Instantiate the command so that we can check if the command is
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// a CommandAutocomplete implementation. If there is an error
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// creating the command, we just ignore it since that will be caught
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// later.
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impl, err := raw.(CommandFactory)()
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if err != nil {
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impl = nil
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}
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// Check if it implements ComandAutocomplete. If so, setup the autocomplete
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if c, ok := impl.(CommandAutocomplete); ok {
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subCmd.Args = c.AutocompleteArgs()
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subCmd.Flags = c.AutocompleteFlags()
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}
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cmd.Sub[k] = subCmd
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return false
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}
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walkPrefix := prefix
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if walkPrefix != "" {
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walkPrefix += " "
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}
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c.commandTree.WalkPrefix(walkPrefix, walkFn)
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return cmd
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}
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func (c *CLI) commandHelp(command Command) {
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// Get the template to use
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tpl := strings.TrimSpace(defaultHelpTemplate)
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if t, ok := command.(CommandHelpTemplate); ok {
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tpl = t.HelpTemplate()
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}
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if !strings.HasSuffix(tpl, "\n") {
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tpl += "\n"
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}
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// Parse it
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t, err := template.New("root").Parse(tpl)
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if err != nil {
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t = template.Must(template.New("root").Parse(fmt.Sprintf(
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"Internal error! Failed to parse command help template: %s\n", err)))
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}
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// Template data
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data := map[string]interface{}{
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"Name": c.Name,
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"Help": command.Help(),
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}
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// Build subcommand list if we have it
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var subcommandsTpl []map[string]interface{}
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if c.commandNested {
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// Get the matching keys
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subcommands := c.helpCommands(c.Subcommand())
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keys := make([]string, 0, len(subcommands))
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for k := range subcommands {
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keys = append(keys, k)
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}
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// Sort the keys
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sort.Strings(keys)
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// Figure out the padding length
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var longest int
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for _, k := range keys {
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if v := len(k); v > longest {
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longest = v
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}
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}
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// Go through and create their structures
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subcommandsTpl = make([]map[string]interface{}, 0, len(subcommands))
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for _, k := range keys {
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// Get the command
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raw, ok := subcommands[k]
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if !ok {
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c.HelpWriter.Write([]byte(fmt.Sprintf(
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"Error getting subcommand %q", k)))
|
|
}
|
|
sub, err := raw()
|
|
if err != nil {
|
|
c.HelpWriter.Write([]byte(fmt.Sprintf(
|
|
"Error instantiating %q: %s", k, err)))
|
|
}
|
|
|
|
// Find the last space and make sure we only include that last part
|
|
name := k
|
|
if idx := strings.LastIndex(k, " "); idx > -1 {
|
|
name = name[idx+1:]
|
|
}
|
|
|
|
subcommandsTpl = append(subcommandsTpl, map[string]interface{}{
|
|
"Name": name,
|
|
"NameAligned": name + strings.Repeat(" ", longest-len(k)),
|
|
"Help": sub.Help(),
|
|
"Synopsis": sub.Synopsis(),
|
|
})
|
|
}
|
|
}
|
|
data["Subcommands"] = subcommandsTpl
|
|
|
|
// Write
|
|
err = t.Execute(c.HelpWriter, data)
|
|
if err == nil {
|
|
return
|
|
}
|
|
|
|
// An error, just output...
|
|
c.HelpWriter.Write([]byte(fmt.Sprintf(
|
|
"Internal error rendering help: %s", err)))
|
|
}
|
|
|
|
// helpCommands returns the subcommands for the HelpFunc argument.
|
|
// This will only contain immediate subcommands.
|
|
func (c *CLI) helpCommands(prefix string) map[string]CommandFactory {
|
|
// If our prefix isn't empty, make sure it ends in ' '
|
|
if prefix != "" && prefix[len(prefix)-1] != ' ' {
|
|
prefix += " "
|
|
}
|
|
|
|
// Get all the subkeys of this command
|
|
var keys []string
|
|
c.commandTree.WalkPrefix(prefix, func(k string, raw interface{}) bool {
|
|
// Ignore any sub-sub keys, i.e. "foo bar baz" when we want "foo bar"
|
|
if !strings.Contains(k[len(prefix):], " ") {
|
|
keys = append(keys, k)
|
|
}
|
|
|
|
return false
|
|
})
|
|
|
|
// For each of the keys return that in the map
|
|
result := make(map[string]CommandFactory, len(keys))
|
|
for _, k := range keys {
|
|
raw, ok := c.commandTree.Get(k)
|
|
if !ok {
|
|
// We just got it via WalkPrefix above, so we just panic
|
|
panic("not found: " + k)
|
|
}
|
|
|
|
// If this is a hidden command, don't show it
|
|
if _, ok := c.commandHidden[k]; ok {
|
|
continue
|
|
}
|
|
|
|
result[k] = raw.(CommandFactory)
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
func (c *CLI) processArgs() {
|
|
for i, arg := range c.Args {
|
|
if arg == "--" {
|
|
break
|
|
}
|
|
|
|
// Check for help flags.
|
|
if arg == "-h" || arg == "-help" || arg == "--help" {
|
|
c.isHelp = true
|
|
continue
|
|
}
|
|
|
|
// Check for autocomplete flags
|
|
if c.Autocomplete {
|
|
if arg == "-"+c.AutocompleteInstall || arg == "--"+c.AutocompleteInstall {
|
|
c.isAutocompleteInstall = true
|
|
continue
|
|
}
|
|
|
|
if arg == "-"+c.AutocompleteUninstall || arg == "--"+c.AutocompleteUninstall {
|
|
c.isAutocompleteUninstall = true
|
|
continue
|
|
}
|
|
}
|
|
|
|
if c.subcommand == "" {
|
|
// Check for version flags if not in a subcommand.
|
|
if arg == "-v" || arg == "-version" || arg == "--version" {
|
|
c.isVersion = true
|
|
continue
|
|
}
|
|
|
|
if arg != "" && arg[0] == '-' {
|
|
// Record the arg...
|
|
c.topFlags = append(c.topFlags, arg)
|
|
}
|
|
}
|
|
|
|
// If we didn't find a subcommand yet and this is the first non-flag
|
|
// argument, then this is our subcommand.
|
|
if c.subcommand == "" && arg != "" && arg[0] != '-' {
|
|
c.subcommand = arg
|
|
if c.commandNested {
|
|
// If the command has a space in it, then it is invalid.
|
|
// Set a blank command so that it fails.
|
|
if strings.ContainsRune(arg, ' ') {
|
|
c.subcommand = ""
|
|
return
|
|
}
|
|
|
|
// Determine the argument we look to to end subcommands.
|
|
// We look at all arguments until one has a space. This
|
|
// disallows commands like: ./cli foo "bar baz". An argument
|
|
// with a space is always an argument.
|
|
j := 0
|
|
for k, v := range c.Args[i:] {
|
|
if strings.ContainsRune(v, ' ') {
|
|
break
|
|
}
|
|
|
|
j = i + k + 1
|
|
}
|
|
|
|
// Nested CLI, the subcommand is actually the entire
|
|
// arg list up to a flag that is still a valid subcommand.
|
|
searchKey := strings.Join(c.Args[i:j], " ")
|
|
k, _, ok := c.commandTree.LongestPrefix(searchKey)
|
|
if ok {
|
|
// k could be a prefix that doesn't contain the full
|
|
// command such as "foo" instead of "foobar", so we
|
|
// need to verify that we have an entire key. To do that,
|
|
// we look for an ending in a space or an end of string.
|
|
reVerify := regexp.MustCompile(regexp.QuoteMeta(k) + `( |$)`)
|
|
if reVerify.MatchString(searchKey) {
|
|
c.subcommand = k
|
|
i += strings.Count(k, " ")
|
|
}
|
|
}
|
|
}
|
|
|
|
// The remaining args the subcommand arguments
|
|
c.subcommandArgs = c.Args[i+1:]
|
|
}
|
|
}
|
|
|
|
// If we never found a subcommand and support a default command, then
|
|
// switch to using that.
|
|
if c.subcommand == "" {
|
|
if _, ok := c.Commands[""]; ok {
|
|
args := c.topFlags
|
|
args = append(args, c.subcommandArgs...)
|
|
c.topFlags = nil
|
|
c.subcommandArgs = args
|
|
}
|
|
}
|
|
}
|
|
|
|
// defaultAutocompleteInstall and defaultAutocompleteUninstall are the
|
|
// default values for the autocomplete install and uninstall flags.
|
|
const defaultAutocompleteInstall = "autocomplete-install"
|
|
const defaultAutocompleteUninstall = "autocomplete-uninstall"
|
|
|
|
const defaultHelpTemplate = `
|
|
{{.Help}}{{if gt (len .Subcommands) 0}}
|
|
|
|
Subcommands:
|
|
{{- range $value := .Subcommands }}
|
|
{{ $value.NameAligned }} {{ $value.Synopsis }}{{ end }}
|
|
{{- end }}
|
|
`
|