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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package singlechecker defines the main function for an analysis
// driver with only a single analysis.
// This package makes it easy for a provider of an analysis package to
// also provide a standalone tool that runs just that analysis.
//
// For example, if example.org/findbadness is an analysis package,
// all that is needed to define a standalone tool is a file,
// example.org/findbadness/cmd/findbadness/main.go, containing:
//
// // The findbadness command runs an analysis.
// package main
//
// import (
// "example.org/findbadness"
// "golang.org/x/tools/go/analysis/singlechecker"
// )
//
// func main() { singlechecker.Main(findbadness.Analyzer) }
//
package singlechecker
import (
"flag"
"fmt"
"log"
"os"
"strings"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/analysis/internal/analysisflags"
"golang.org/x/tools/go/analysis/internal/checker"
"golang.org/x/tools/go/analysis/unitchecker"
)
// Main is the main function for a checker command for a single analysis.
func Main(a *analysis.Analyzer) {
log.SetFlags(0)
log.SetPrefix(a.Name + ": ")
analyzers := []*analysis.Analyzer{a}
if err := analysis.Validate(analyzers); err != nil {
log.Fatal(err)
}
checker.RegisterFlags()
flag.Usage = func() {
paras := strings.Split(a.Doc, "\n\n")
fmt.Fprintf(os.Stderr, "%s: %s\n\n", a.Name, paras[0])
fmt.Printf("Usage: %s [-flag] [package]\n\n", a.Name)
if len(paras) > 1 {
fmt.Println(strings.Join(paras[1:], "\n\n"))
}
fmt.Println("\nFlags:")
flag.PrintDefaults()
}
analyzers = analysisflags.Parse(analyzers, false)
args := flag.Args()
if len(args) == 0 {
flag.Usage()
os.Exit(1)
}
if len(args) == 1 && strings.HasSuffix(args[0], ".cfg") {
unitchecker.Run(args[0], analyzers)
panic("unreachable")
}
os.Exit(checker.Run(args, analyzers))
}
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