From b4ff21d21ab28ae6ade9b4c213e245cfd2f9e5c4 Mon Sep 17 00:00:00 2001 From: Faris Huskovic Date: Mon, 20 Jul 2020 08:55:19 -0500 Subject: [PATCH] Support subcommand aliases --- README.md | 3 +- command.go | 8 +- command_test.go | 105 +++++++++++++++++++++ go.mod | 6 +- go.sum | 237 ++++++++++++++++++++++++++++++++++++++++++++++++ help.go | 26 ++++-- run.go | 30 +++++- 7 files changed, 401 insertions(+), 14 deletions(-) create mode 100644 command_test.go diff --git a/README.md b/README.md index 0798e22..d361e86 100644 --- a/README.md +++ b/README.md @@ -95,6 +95,7 @@ func (c *subcmd) Spec() cli.CommandSpec { return cli.CommandSpec{ Name: "sub", Usage: "", + Aliases: []string{"s"}, Desc: `This is a simple subcommand.`, } } @@ -134,5 +135,5 @@ Usage: subcommand [flags] This is a simple example of subcommands. Commands: - sub This is a simple subcommand. + s,sub - This is a simple subcommand. ``` diff --git a/command.go b/command.go index e829dff..957c52c 100644 --- a/command.go +++ b/command.go @@ -23,10 +23,11 @@ type CommandSpec struct { // RawArgs indicates that flags should not be parsed, and they should be deferred // to the command. RawArgs bool - // Hidden indicates that this command should not show up in it's parent's // subcommand help. Hidden bool + // Aliases contains a list of alternative names that can be used for a particular command. + Aliases []string } // ShortDesc returns the first line of Desc. @@ -34,6 +35,11 @@ func (c CommandSpec) ShortDesc() string { return strings.Split(c.Desc, "\n")[0] } +// HasAliases evaluates whether particular command has any alternative names. +func (c CommandSpec) HasAliases() bool { + return len(c.Aliases) > 0 +} + // Command describes a command or subcommand. type Command interface { // Spec returns metadata about the command. diff --git a/command_test.go b/command_test.go new file mode 100644 index 0000000..0640898 --- /dev/null +++ b/command_test.go @@ -0,0 +1,105 @@ +package cli + +import ( + "bytes" + "os" + "testing" + + "cdr.dev/slog/sloggers/slogtest/assert" + "github.com/spf13/pflag" +) + +const ( + success = "test successful" + + expectedParentCmdHelpOutput = `Usage: mockParentCmd Mock parent command usage. + +Mock parent command description. + +Commands: + s,sc,sub,mockSubCmd - A simple mock subcommand with aliases. +` +) + +var subCmd = &mockSubCmd{buf: new(bytes.Buffer)} + +type ( + mockParentCmd struct{} + mockSubCmd struct{ buf *bytes.Buffer } +) + +func (c *mockParentCmd) Run(fl *pflag.FlagSet) {} + +func (c *mockParentCmd) Subcommands() []Command { return []Command{subCmd} } + +func (c *mockParentCmd) Spec() CommandSpec { + return CommandSpec{ + Name: "mockParentCmd", + Usage: "Mock parent command usage.", + Desc: "Mock parent command description.", + } +} + +func (c *mockSubCmd) Run(fl *pflag.FlagSet) { + c.buf = new(bytes.Buffer) + if _, err := c.Write([]byte(success)); err != nil { + fl.Usage() + } +} + +func (c *mockSubCmd) Write(b []byte) (int, error) { return c.buf.Write(b) } + +func (c *mockSubCmd) Spec() CommandSpec { + return CommandSpec{ + Name: "mockSubCmd", + Usage: "Test a subcommand.", + Aliases: []string{"s", "sc", "sub"}, + Desc: "A simple mock subcommand with aliases.", + } +} + +func TestSubCmdAliases(t *testing.T) { + for _, test := range []struct { + name, expected string + }{ + { + name: "s", + expected: success, + }, + { + name: "sc", + expected: success, + }, + { + name: "sub", + expected: success, + }, + } { + t.Run(test.name, func(t *testing.T) { + // Since the alias is the name of the test + // we can just pass it as the alias arg. + os.Args = []string{"mockParentCmd", test.name} + // Based on os.Args, when splitArgs is invoked, + // it should be able to deduce the subcommand we want + // based on the new alias map it's being passed. + RunRoot(&mockParentCmd{}) + // The success const is never written into the buffer + // if the subcommand fails to be invoked by alias. + got := string(subCmd.buf.Bytes()) + assert.Equal(t, test.name, test.expected, got) + }) + } +} + +func TestSubcmdAliasesInParentCmdHelpOutput(t *testing.T) { + buf := new(bytes.Buffer) + cmd := &mockParentCmd{} + name := cmd.Spec().Name + fl := pflag.NewFlagSet(name, pflag.ExitOnError) + // If the help output is not written to the buffer + // in the format we expect then the test will fail. + renderHelp(name, cmd, fl, buf) + got := string(buf.Bytes()) + expected := expectedParentCmdHelpOutput + assert.Equal(t, "display_subcmd_aliases_in_parentcmd_help_output", expected, got) +} diff --git a/go.mod b/go.mod index 870002d..1a34c97 100644 --- a/go.mod +++ b/go.mod @@ -2,4 +2,8 @@ module go.coder.com/cli go 1.12 -require github.com/spf13/pflag v1.0.3 +require ( + cdr.dev/slog v1.3.0 + github.com/spf13/pflag v1.0.3 + github.com/stretchr/testify v1.6.1 // indirect +) diff --git a/go.sum b/go.sum index edd0bcf..83e625b 100644 --- a/go.sum +++ b/go.sum @@ -1,2 +1,239 @@ +cdr.dev/slog v1.3.0 h1:MYN1BChIaVEGxdS7I5cpdyMC0+WfJfK8BETAfzfLUGQ= +cdr.dev/slog v1.3.0/go.mod h1:C5OL99WyuOK8YHZdYY57dAPN1jK2WJlCdq2VP6xeQns= +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go 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3f679c8..c04e2e5 100644 --- a/help.go +++ b/help.go @@ -46,11 +46,17 @@ func renderFlagHelp(fullName string, fl *pflag.FlagSet, w io.Writer) { // renderHelp generates a command's help page. func renderHelp(fullName string, cmd Command, fl *pflag.FlagSet, w io.Writer) { + var b strings.Builder + spec := cmd.Spec() + fmt.Fprintf(&b, "Usage: %v %v\n\n", fullName, spec.Usage) + + // If the command has aliases, add them to the output as a comma-separated list. + if spec.HasAliases() { + fmt.Fprintf(&b, "Aliases: %v", spec.Aliases) + } // Render usage and description. - fmt.Fprintf(w, "Usage: %v %v\n\n", - fullName, cmd.Spec().Usage, - ) - fmt.Fprintf(w, "%v\n", cmd.Spec().Desc) + usageAndDesc := fmt.Sprintf("%s%s\n", b.String(), spec.Desc) + fmt.Fprint(w, usageAndDesc) tw := tabwriter.NewWriter(w, 0, 4, 2, ' ', tabwriter.StripEscape) defer tw.Flush() @@ -68,14 +74,18 @@ func renderHelp(fullName string, cmd Command, fl *pflag.FlagSet, w io.Writer) { } for _, cmd := range pc.Subcommands() { - if cmd.Spec().Hidden { + spec := cmd.Spec() + + if spec.Hidden { continue } + allNames := strings.Join(append(spec.Aliases, spec.Name), ",") + fmt.Fprintf(tw, - tabEscape+"\t"+tabEscape+"%v\t%v\n", - cmd.Spec().Name, - cmd.Spec().ShortDesc(), + tabEscape+"\t"+tabEscape+"%v\t- %v\n", + allNames, + spec.ShortDesc(), ) } } diff --git a/run.go b/run.go index e3a1ddb..34341a9 100644 --- a/run.go +++ b/run.go @@ -7,6 +7,8 @@ import ( "github.com/spf13/pflag" ) +type aliasMap map[Command][]string + func appendParent(parent string, add string) string { return parent + add + " " } @@ -15,14 +17,24 @@ func appendParent(parent string, add string) string { // flags/args. If a subcommand is found, the parent args, subcommand args, and the subcommand will // be returned. If a subcommand isn't found, the args will be returned as is, the subcommand args // will be empty, and the subcommand will be nil. -func splitArgs(subCmds []Command, args []string) (cmdArgs, subArgs []string, subCmd Command) { +func splitArgs(subCmds []Command, args []string, aliases aliasMap) (cmdArgs, subArgs []string, subCmd Command) { for i, arg := range args { if strings.HasPrefix(arg, "-") { continue } for _, subCommand := range subCmds { - if subCommand.Spec().Name == arg { + spec := subCommand.Spec() + + if spec.HasAliases() { + for _, alias := range spec.Aliases { + if arg == alias { + return args[:i], args[i+1:], subCommand + } + } + } + + if spec.Name == arg { return args[:i], args[i+1:], subCommand } } @@ -58,9 +70,21 @@ func Run(cmd Command, args []string, parent string) { cmdArgs, subArgs []string subCmd Command ) + pc, isParentCmd := cmd.(ParentCommand) if isParentCmd { - cmdArgs, subArgs, subCmd = splitArgs(pc.Subcommands(), args) + aliases := make(aliasMap) + subCmds := pc.Subcommands() + + for _, sc := range subCmds { + spec := sc.Spec() + + if spec.HasAliases() { + aliases[sc] = spec.Aliases + } + } + + cmdArgs, subArgs, subCmd = splitArgs(subCmds, args, aliases) if subCmd != nil { args = cmdArgs }