1// Copyright 2021 Google LLC
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//      http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package main
16
17import (
18	"flag"
19	"fmt"
20	"go.starlark.net/starlark"
21	"os"
22	"rbcrun"
23	"strings"
24)
25
26var (
27	execprog = flag.String("c", "", "execute program `prog`")
28	rootdir  = flag.String("d", ".", "the value of // for load paths")
29	file     = flag.String("f", "", "file to execute")
30	perfFile = flag.String("perf", "", "save performance data")
31)
32
33func main() {
34	flag.Parse()
35	filename := *file
36	var src interface{}
37	var env []string
38
39	rc := 0
40	for _, arg := range flag.Args() {
41		if strings.Contains(arg, "=") {
42			env = append(env, arg)
43		} else if filename == "" {
44			filename = arg
45		} else {
46			quit("only one file can be executed\n")
47		}
48	}
49	if *execprog != "" {
50		if filename != "" {
51			quit("either -c or file name should be present\n")
52		}
53		filename = "<cmdline>"
54		src = *execprog
55	}
56	if filename == "" {
57		if len(env) > 0 {
58			fmt.Fprintln(os.Stderr,
59				"no file to run -- if your file's name contains '=', use -f to specify it")
60		}
61		flag.Usage()
62		os.Exit(1)
63	}
64	if stat, err := os.Stat(*rootdir); os.IsNotExist(err) || !stat.IsDir() {
65		quit("%s is not a directory\n", *rootdir)
66	}
67	if *perfFile != "" {
68		pprof, err := os.Create(*perfFile)
69		if err != nil {
70			quit("%s: err", *perfFile)
71		}
72		defer pprof.Close()
73		if err := starlark.StartProfile(pprof); err != nil {
74			quit("%s\n", err)
75		}
76	}
77	rbcrun.LoadPathRoot = *rootdir
78	err := rbcrun.Run(filename, src, env)
79	if *perfFile != "" {
80		if err2 := starlark.StopProfile(); err2 != nil {
81			fmt.Fprintln(os.Stderr, err2)
82			rc = 1
83		}
84	}
85	if err != nil {
86		if evalErr, ok := err.(*starlark.EvalError); ok {
87			quit("%s\n", evalErr.Backtrace())
88		} else {
89			quit("%s\n", err)
90		}
91	}
92	os.Exit(rc)
93}
94
95func quit(format string, s ...interface{}) {
96	fmt.Fprintln(os.Stderr, format, s)
97	os.Exit(2)
98}
99