| 1 | #!/usr/bin/env perl |
| 2 | |
| 3 | # reservoir -- read stdin until EOF, and _then_ write it all to stdout. |
| 4 | |
| 5 | $usage = |
| 6 | "usage: reservoir [ -o file | -O file ]\n". |
| 7 | "where: -O file open and write to file after end of input\n". |
| 8 | " -o file same, but only if output is non-empty\n". |
| 9 | " also: reservoir --version report version number\n" . |
| 10 | " reservoir --help display this help text\n" . |
| 11 | " reservoir --licence display (MIT) licence text\n"; |
| 12 | |
| 13 | $licence = |
| 14 | "reservoir is copyright 2005,2008 Simon Tatham.\n" . |
| 15 | "\n" . |
| 16 | "Permission is hereby granted, free of charge, to any person\n" . |
| 17 | "obtaining a copy of this software and associated documentation files\n" . |
| 18 | "(the \"Software\"), to deal in the Software without restriction,\n" . |
| 19 | "including without limitation the rights to use, copy, modify, merge,\n" . |
| 20 | "publish, distribute, sublicense, and/or sell copies of the Software,\n" . |
| 21 | "and to permit persons to whom the Software is furnished to do so,\n" . |
| 22 | "subject to the following conditions:\n" . |
| 23 | "\n" . |
| 24 | "The above copyright notice and this permission notice shall be\n" . |
| 25 | "included in all copies or substantial portions of the Software.\n" . |
| 26 | "\n" . |
| 27 | "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n" . |
| 28 | "EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n" . |
| 29 | "MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\n" . |
| 30 | "NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS\n" . |
| 31 | "BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN\n" . |
| 32 | "ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\n" . |
| 33 | "CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n" . |
| 34 | "SOFTWARE.\n"; |
| 35 | |
| 36 | $outputfile = undef; |
| 37 | $allowemptyoutput = 0; |
| 38 | |
| 39 | while ($_=shift @ARGV) { |
| 40 | last if /^--$/; |
| 41 | unshift (@ARGV, $_), last unless /^-(.*)/; |
| 42 | $arg = $1; |
| 43 | if ($arg eq "-help") { |
| 44 | print STDERR $usage; |
| 45 | exit 0; |
| 46 | } elsif ($arg eq "-version") { |
| 47 | if ('$Revision$' =~ /Revision:\s+(\d+)/) { |
| 48 | print "reservoir revision $1\n"; |
| 49 | } else { |
| 50 | print "reservoir: unknown revision\n"; |
| 51 | } |
| 52 | exit 0; |
| 53 | } elsif ($arg eq "-licence" or $arg eq "-license") { |
| 54 | print $licence; |
| 55 | exit 0; |
| 56 | } elsif ($arg =~ /^([oO])(.*)$/) { |
| 57 | $allowemptyoutput = ($1 eq "O"); |
| 58 | $outputfile = $2; |
| 59 | $outputfile = shift @ARGV if $outputfile eq ""; |
| 60 | die "reservoir: expected file name after '-$1'\n" if $outputfile eq ""; |
| 61 | } else { |
| 62 | die "reservoir: unrecognised option '-$arg'\n"; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | die $usage if $#ARGV > 0; |
| 67 | |
| 68 | $data = ''; |
| 69 | |
| 70 | $data .= $_ while <STDIN>; |
| 71 | |
| 72 | if (defined $outputfile) { |
| 73 | exit unless length($data) or $allowemptyoutput; |
| 74 | open OUT, ">$outputfile" or die "$outputfile: open: $!\n"; |
| 75 | select OUT; |
| 76 | } |
| 77 | print $data; |