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https://github.com/golang/go
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a072e66104
This switched the golsp binary to support a sub-command model so it can grow some guru like command line query capabilites Change-Id: I1a7a49bb17701e62004bba636d6bee9de2481ffd Reviewed-on: https://go-review.googlesource.com/c/154559 Reviewed-by: Rebecca Stambler <rstambler@golang.org>
82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package cmd handles the golsp command line.
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// It contains a handler for each of the modes, along with all the flag handling
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// and the command line output format.
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package cmd
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import (
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"context"
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"flag"
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"fmt"
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"golang.org/x/tools/internal/tool"
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)
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// Application is the main application as passed to tool.Main
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// It handles the main command line parsing and dispatch to the sub commands.
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type Application struct {
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// Embed the basic profiling flags supported by the tool package
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tool.Profile
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// we also include the server directly for now, so the flags work even without
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// the verb. We should remove this when we stop allowing the server verb by
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// default
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Server server
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}
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// Name implements tool.Application returning the binary name.
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func (app *Application) Name() string { return "golsp" }
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// Usage implements tool.Application returning empty extra argument usage.
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func (app *Application) Usage() string { return "<mode> [mode-flags] [mode-args]" }
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// ShortHelp implements tool.Application returning the main binary help.
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func (app *Application) ShortHelp() string {
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return "The Go Language Smartness Provider."
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}
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// DetailedHelp implements tool.Application returning the main binary help.
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// This includes the short help for all the sub commands.
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func (app *Application) DetailedHelp(f *flag.FlagSet) {
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fmt.Fprint(f.Output(), `
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Available modes are:
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`)
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for _, c := range app.modes() {
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fmt.Fprintf(f.Output(), " %s : %v\n", c.Name(), c.ShortHelp())
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}
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fmt.Fprint(f.Output(), `
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golsp flags are:
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`)
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f.PrintDefaults()
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}
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// Run takes the args after top level flag processing, and invokes the correct
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// sub command as specified by the first argument.
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// If no arguments are passed it will invoke the server sub command, as a
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// temporary measure for compatability.
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func (app *Application) Run(ctx context.Context, args ...string) error {
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if len(args) == 0 {
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tool.Main(ctx, &app.Server, args)
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return nil
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}
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mode, args := args[0], args[1:]
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for _, m := range app.modes() {
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if m.Name() == mode {
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tool.Main(ctx, m, args)
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return nil
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}
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}
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return tool.CommandLineErrorf("Unknown mode %v", mode)
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}
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// modes returns the set of command modes supported by the golsp tool on the
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// command line.
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// The mode is specified by the first non flag argument.
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func (app *Application) modes() []tool.Application {
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return []tool.Application{
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&app.Server,
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}
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}
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