81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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"github.com/alexflint/go-arg"
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)
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var version string // to be set by compiler
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var args struct {
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File string `arg:"positional" help:"if not specified, will read from stdin" default:""`
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Outfile string `arg:"positional" help:"if not specified, will emit to stdout" default:""`
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Version bool `arg:"-v" help:"print version and exit"`
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YieldDepsOnly bool `arg:"--yield-deps-only" help:"print dependencies as a JSON array and exit" default:false`
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ExposeDeps bool `arg:"--expose-deps" help:"expose dependencies to program" default:false`
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DepsVarName string `arg:"--deps-var-name" help:"override deps variable name" default:"deps"`
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IgnoreShebang bool `arg:"--ignore-shebang" help:"ignore shebang requirement" default:false`
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}
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func main() {
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arg.MustParse(&args)
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if args.Version {
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fmt.Println(version)
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os.Exit(0)
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}
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var file []byte
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if args.File != "" {
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f, err := os.ReadFile(args.File)
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if err != nil {
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if os.IsNotExist(err) {
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fmt.Fprintf(os.Stderr, "File %s does not exist!", args.File)
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os.Exit(1)
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}
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panic(err)
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}
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file = f
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} else {
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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file = scanner.Bytes()
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}
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if scanner.Err() != nil {
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panic(scanner.Err())
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}
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}
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code := string(file)
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found, err := find(code)
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if err != nil {
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panic(err)
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}
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codelines := strings.Split(code, "\n")
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if len(codelines) < 2 {
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fmt.Fprintf(os.Stderr, "The code must have at least two lines!\n")
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os.Exit(3)
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}
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shebang := codelines[0]
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if !((shebang == "#!/bin/bash") || (shebang == "#!/usr/bin/env bash")) && (!args.IgnoreShebang) {
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fmt.Fprintf(os.Stderr, "The code must start with one of those shebangs: #!/bin/bash OR #!/usr/bin/env bash\n")
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os.Exit(2)
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}
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gen := shebang + "\n\n" + gencode(found) + "\n" + strings.Join(codelines[1:], "\n")
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if args.Outfile == "" {
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fmt.Printf("%s", gen)
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} else {
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os.WriteFile(args.Outfile, []byte(gen), os.FileMode(0o755))
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}
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}
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