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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
|
|
||
| flag "github.com/spf13/pflag" | ||
| "github.com/tamada/peripherals" | ||
| "github.com/tamada/peripherals/cmd/common" | ||
| "github.com/tamada/peripherals/errs" | ||
| "github.com/tamada/peripherals/snip" | ||
| ) | ||
|
|
||
| type SnipOpts struct { | ||
| Number int | ||
| snip.Snipper | ||
| common.HeaderOpts | ||
| common.HelpOptions | ||
| } | ||
|
|
||
| func (opts *SnipOpts) Validate() error { | ||
| if opts.Head < 0 && opts.Tail < 0 && opts.Number < 0 { | ||
| return errors.New("no lines specified. either options of -H, -T, -N must be specified") | ||
| } | ||
| if opts.Head < 0 && opts.Tail < 0 && opts.Number > 0 { | ||
| opts.Head = opts.Number | ||
| opts.Tail = opts.Number | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func helpMessage(appName string, fs *flag.FlagSet) string { | ||
| return fmt.Sprintf(`%s [OPTIONS] [FILEs...] | ||
| OPTIONS | ||
| %s | ||
| FILE | ||
| gives file name for the input. if this argument is single dash ('-') or absent, | ||
| it reads strings from STDIN. | ||
| if more than a single file is specified, each file is separated by a header | ||
| consisting of the string '==> XXX <==' where 'XXX' is the name of the file.`, appName, fs.FlagUsages()) | ||
| } | ||
|
|
||
| func buildFlags() (*flag.FlagSet, *SnipOpts) { | ||
| var opts = &SnipOpts{} | ||
| var flags = flag.NewFlagSet("pskip", flag.ContinueOnError) | ||
| flags.Usage = func() { fmt.Println(helpMessage("pskip", flags)) } | ||
| flags.IntVarP(&opts.Head, "head", "H", -1, "print first HEAD lines (same as head command).") | ||
| flags.IntVarP(&opts.Tail, "tail", "T", -1, "print last TAIL lines (same as tail command).") | ||
| flags.IntVarP(&opts.Number, "number", "N", 5, "print first and last lines (default is 5).") | ||
| flags.BoolVarP(&opts.LineNumber, "line-number", "n", false, "print line number with output lines.") | ||
| flags.BoolVarP(&opts.SkipSnip, "no-snip-sign", "s", false, "suppress printing of snip sign and the number of snipped lines.") | ||
| flags.BoolVarP(&opts.NoHeader, "no-header", "q", false, "suppress printing of headers when multiple files are being examined.") | ||
| flags.BoolVarP(&opts.HelpFlag, "help", "h", false, "print this message and exit") | ||
| flags.BoolVarP(&opts.VersionFlag, "version", "v", false, "print the version information and exit") | ||
| flags.SortFlags = false | ||
| return flags, opts | ||
| } | ||
|
|
||
| func perform(opts *SnipOpts, args []string) error { | ||
| if err := opts.Validate(); err != nil { | ||
| return err | ||
| } | ||
| center := errs.New() | ||
| for _, arg := range args { | ||
| if opts.IsPrintHeader(args) { | ||
| fmt.Printf("===> %s <===\n", arg) | ||
| } | ||
| center.Push(opts.PerformEach(arg, os.Stdout)) | ||
| } | ||
| if len(args) == 0 { | ||
| center.Push(opts.PerformEach("", os.Stdout)) | ||
| } | ||
| return center.SelfOrNil() | ||
| } | ||
|
|
||
| func printHelp(opts *SnipOpts, fs *flag.FlagSet) int { | ||
| if opts.VersionFlag { | ||
| fmt.Println(peripherals.Version("snip")) | ||
| } | ||
| if opts.HelpFlag { | ||
| fmt.Println(helpMessage("snip", fs)) | ||
| } | ||
| return 0 | ||
| } | ||
|
|
||
| func goMain(args []string) int { | ||
| flags, opts := buildFlags() | ||
| if err := flags.Parse(args); err != nil { | ||
| return common.PrintError(err, 1) | ||
| } | ||
| if opts.IsHelp() { | ||
| return printHelp(opts, flags) | ||
| } | ||
| return common.PrintError(perform(opts, flags.Args()[1:]), 2) | ||
| } | ||
|
|
||
| func main() { | ||
| status := goMain(os.Args) | ||
| os.Exit(status) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package main | ||
|
|
||
| func Example_withNumber() { | ||
| goMain([]string{"snip", "--line-number", "--number", "2", "../../testdata/test1.txt"}) | ||
| // Output: | ||
| // 1 a1 | ||
| // 2 a1 | ||
| // ... snip ... (4 lines) | ||
| // 7 a1 | ||
| // 8 A1 | ||
| } | ||
|
|
||
| func Example_headTail() { | ||
| goMain([]string{"snip", "--no-snip-sign", "--head", "1", "--tail", "2", "../../testdata/test1.txt"}) | ||
| // Output: | ||
| // a1 | ||
| // a1 | ||
| // A1 | ||
| } | ||
|
|
||
| func Example_ShortLengthFile() { | ||
| goMain([]string{"snip", "../../testdata/eval_script.sh"}) // 4 lines | ||
| // Output: | ||
| // #! /bin/sh | ||
| // | ||
| // echo "PLINE: $PLINE" | ||
| // exec test "$PLINE" = "a1" | ||
| } | ||
|
|
||
| func Example_printHelp() { | ||
| goMain([]string{"snip", "--help"}) | ||
| // Output: | ||
| // snip [OPTIONS] [FILEs...] | ||
| // OPTIONS | ||
| // -H, --head int print first HEAD lines (same as head command). (default -1) | ||
| // -T, --tail int print last TAIL lines (same as tail command). (default -1) | ||
| // -N, --number int print first and last lines (default is 5). (default 5) | ||
| // -n, --line-number print line number with output lines. | ||
| // -s, --no-snip-sign suppress printing of snip sign and the number of snipped lines. | ||
| // -q, --no-header suppress printing of headers when multiple files are being examined. | ||
| // -h, --help print this message and exit | ||
| // -v, --version print the version information and exit | ||
| // | ||
| // FILE | ||
| // gives file name for the input. if this argument is single dash ('-') or absent, | ||
| // it reads strings from STDIN. | ||
| // if more than a single file is specified, each file is separated by a header | ||
| // consisting of the string '==> XXX <==' where 'XXX' is the name of the file. | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,6 @@ | ||
| github.com/bits-and-blooms/bitset v1.2.2 h1:J5gbX05GpMdBjCvQ9MteIg2KKDExr7DrgK+Yc15FvIk= | ||
| github.com/bits-and-blooms/bitset v1.2.2/go.mod h1:gIdJ4wp64HaoK2YrL1Q5/N7Y16edYb8uY+O0FJTyyDA= | ||
| github.com/gertd/go-pluralize v0.2.1 h1:M3uASbVjMnTsPb0PNqg+E/24Vwigyo/tvyMTtAlLgiA= | ||
| github.com/gertd/go-pluralize v0.2.1/go.mod h1:rbYaKDbsXxmRfr8uygAEKhOWsjyrrqrkHVpZvoOp8zk= | ||
| github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA= | ||
| github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg= |
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