Internet Info 1994 March/Internet Info CD-ROM (Walnut Creek) (March 1994).iso/networking/mail/mh/contrib/9302/mhpped.shar/mhpped

Text File | 1993-02-03 | 5KB | 214 lines

#!/usr/bin/perl
#
# mhpped - process backticks in comp, repl, and forw components
#
# Taken from "testedit" by Jerry Peek <[e-mail]>;
# abuser: Jerry Sweet <[e-mail]>
#
# $Header: /usr/t/users/jsweet/src/mh-front/RCS/mhpped,v 1.5 1992/11/12 10:03:47 jsweet Exp $

#
# Subprograms
#

sub bail {
  unlink $temp;
  exit 1;
}

sub gripe {
  print STDERR "$prog: ", @_, "\n";
}

sub barf {
  &gripe(@_);
  &bail;
}

sub check {
  local($status) = @_;
  &barf("problem writing to temporary draft file \"$temp\"- $!")
    unless $status;
}

sub sh {
  local($_) = @_;
  local($st);

  if ($verbose) {
    print "\t$_\n";
  }

  return if $debug;

  $st = system "$_";

  if ($st >> 8) {
    split;
    &barf("$_[0] failed with status ", $st >> 8);
    exit 1;
  }
}

sub read_profile {
  # Defines associative array %PROFILE_COMPONENT indexed by lower case
  # component name.  Continuation lines are tacked on.  New
  # occurrences of a component wipe out previous occurrences of the
  # same component, but probably shouldn't.

  local($profile) = defined $ENV{'MH'} ? $ENV{'MH'} :
                     $ENV{'HOME'} . "/.mh_profile";
  local($profile_component) = 'x-bogus';
  local($_);

  &barf("can't open profile \"$profile\" - $!")
    unless open(PROFILE, "<$profile");

  while (<PROFILE>) {
    /^(\S+):\s*/ && do {
            ($profile_component = $1) =~ tr/A-Z/a-z/;
            $PROFILE_COMPONENT{$profile_component} = $';
        };

    /^[ \t]/ && do {
            $PROFILE_COMPONENT{$profile_component} .= $_;
        };
  }
}

#
# Main
#

umask 077;  # This should probably be adjustable, but isn't at the moment.

($prog = $0) =~ s|.*/||;    # Get the invocation name of this program

# Check the profile

&read_profile;
if (defined $PROFILE_COMPONENT{$prog}) {
  push(@Args, split(' ', $PROFILE_COMPONENT{$prog}));
}

# Check the command line arguments

push(@Args, @ARGV);

while ($_ = shift @Args) {
  /^-debug$/ && do { ++$debug; next; };

  /^-editor$|^-edit$/ && do { $editor = shift @Args; next; };

  /^-entire$/ && do { ++$entire; next; };

  /^-help$/ && do {
      print <<"xxEndHelpxx";
$prog - pre-process an MH composition template
Usage: $prog [-(no)debug] [-editor editor] [-noeditor] [-(no)entire] [-help]
                [-(no)verbose] [file]
Options:
  -debug          print the message draft and invoke default whatnow
  -editor editor  invoke the specified editor following processing
  -entire         pre-process the entire message, including the body
  -help           print this message
  -nodebug        negates the -debug option
  -noeditor       disables automatic invocation of an editor
  -noentire       negates the -entire option; only the header is processed
  -noverbose      negates the -verbose option
  -verbose        print what's going on as it's being done
  file            if omitted, envar \$mhdraft names the draft file
xxEndHelpxx

      exit 1;
    };

  /^-nodebug$/ && do { --$debug; next; };
  /^-noeditor$|^-noedit$/ && do { $editor = ''; next; };
  /^-noentire$/ && do { --$entire; next; };
  /^-noverbose$/ && do { --$verbose; next; };

  /^-verbose$/ && do { ++$verbose; next; };

  /^[^\-]/ && do { $file = $_; next; };

  &barf("unrecognized command line option \"$_\"");
}

$debug = $debug > 0;
$entire = $entire > 0;
$verbose = $verbose > 0;

# Do some initial setup.

$temp = "/tmp/$prog.$$";
$SIG{'HUP'} = $SIG{'INT'} = $SIG{'TERM'} = 'bail';

# Figure out the name of the draft file

if (! $file) {
  if (defined $ENV{'mhdraft'}) {
    $file = $ENV{'mhdraft'};
  }
  else {
    &barf("no draft file specified");
  }
}
else {
  $ENV{'mhdraft'} = $file;
}

# Let's start running our dirty fingers over the draft file...

&barf("can't open draft file \"$file\" - $!")
    unless open(DRAFT, "<$file");
&barf("can't create temporary draft file \"$temp\" - $!")
    unless open(TEMP, ">$temp");

while (<DRAFT>) {
  last if (/^$|^-/ && ! $entire);

  if (/\`(.+)\`/) {
    $torun = $1;
    $prefix = $`;
    $suffix = $';

    print("\t$torun\n") if ($verbose || $debug);
    chop($result = `$torun`);
    if ($? >> 8) {
      &gripe("$file: line $.: command \"$torun\" returned error status ",
        $? >> 8);
    }
    next if ($prefix =~ /^\s*$|^\S+:\s*$/) &&
        ($suffix =~ /^\s*$/) &&
        ! $result;
        # If there was no result, and there was nothing important
        # before or after the backtick construct, then don't even
        # bother printing a line.  This allows us to omit
        # header components programmatically.

    &check(print(TEMP $prefix, $result, $suffix));
  }
  else {
    &check(print TEMP $_);
  }
}

if (! $entire) {
  &check(print TEMP "-------\n");
  grep(&check(print TEMP $_) && 0, <DRAFT>);
}

&barf("problem closing temporary draft file \"$temp\" - $!")
    unless close(TEMP);

close(DRAFT);

&sh("cp $temp $file");
system('/bin/cat', $temp) if $debug;

print("\trm $temp\n") if ($verbose || $debug);
unlink $temp;

&sh("$editor $file") if $editor;