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|
#!perl
#: sh
#: Perl simulator for /bin/sh (Bourne Shell)
#: 2006-02-01 2006-02-13
use strict;
use warnings;
use FindBin;
use lib "$FindBin::Bin/..";
use lib "$FindBin::Bin/../t/lib";
use Test::Util::Base;
#use Smart::Comments;
use Getopt::Std;
use Time::HiRes qw( sleep );
my %opts;
getopts('c', \%opts);
my $ExitCode = 0;
my $RedirectIndex;
$| = 1;
if ($opts{c}) {
eval {
process_shell(join ' ', @ARGV);
};
warn $@ if $@;
exit($ExitCode);
} else {
print '$ ';
process_prompt();
exit(0);
}
sub process_prompt {
while (<STDIN>) {
chomp;
### Got shell: $_
last if /^\s*exit(?:\s+\d+)?\s*$/;
eval {
process_shell($_);
};
if ($@) {
warn "$@\n";
warn "[Error code $ExitCode returned.]\n";
}
print '$ ';
}
}
sub process_shell {
my $cmd = shift;
#warn Dumper($cmd);
$cmd =~ s/\n+/ /gso;
my @raw_args = split_arg($cmd);
### @raw_args
my @args = process_args(0, @raw_args);
return eval_cmd(@args);
}
sub process_args ($$) {
#warn "!!!!!!!!!!!!!!!!!!!!!!";
my $level = shift;
my @raw_args = @_;
my @args;
foreach (@raw_args) {
#warn "----------\n";
#warn Dumper(@args, $_, @raw_args);
#warn "----------\n";
if ($_ eq ';') {
eval_cmd(@args);
@args = ();
} elsif ($_ eq '>' or $_ eq '>>' or $_ eq '<') {
$RedirectIndex = $#args;
push @args, $_;
} elsif ($_ eq '&&') {
eval_cmd(@args);
return if $ExitCode != 0;
@args = ();
} elsif ($_ eq '||') {
eval_cmd(@args);
return if $ExitCode == 0;
$ExitCode = 0;
@args = ();
} elsif (/^"(.*)"$/o) {
#warn "---------";
#warn qq{Pusing "$1" into args\n};
my $s = $1;
process_escape( $s, q{\\@$\#} );
#warn "$s";
subs_env($s);
push @args, $s if $s ne '';
} elsif (/^'(.*)'$/o) {
#warn " Pusing '$1' into args\n";
push @args, $1 if $1 ne '';
} elsif (/^['"]/o) {
$ExitCode = 1;
die "sh: unexpected EOF while looking for matching `$&'\n";
} else {
#warn " Remaining: $_\n";
my $s = $_;
if ($level == 0 and $s =~ /^\#/o) {
return @args;
}
process_unquoted($s, $level, \@args);
#warn "~~~~~~~~~~~~~~\n";
#warn Dumper(@args, $_, @raw_args);
#warn "~~~~~~~~~~~~~~\n";
}
}
return @args;
}
sub process_unquoted {
my ($s, $level, $rargs) = @_;
return if $s eq '';
## before: $s
$s =~ s/\\(.)/$1/gso;
## after: $s
subs_env($s);
my @subargs = split_arg($s) if $s =~ / /o;
#warn Dumper(@subargs);
if (@subargs > 1) {
push @$rargs, process_args ($level+1, @subargs);
} else {
my @files = glob $s;
if (@files > 1) {
push @$rargs, @files;
} else {
push @$rargs, $s if $s ne '';
}
}
}
sub subs_env {
$_[0] =~ s/\$(\w+)/defined $ENV{$1} ? "$ENV{$1}" : ''/geo;
}
sub touch (@) {
my @files = @_;
foreach my $file (@files) {
my $in;
open $in, ">>$file" and
print $in '' and close $in or
die "Can't touch $file: $!";
}
}
sub eval_cmd {
my @args = @_;
return 0 if not @args;
my $redir = $RedirectIndex;
undef $RedirectIndex;
my $exec = shift @args;
if ($exec =~ /^\s+$/) {
$exec = shift @args;
}
### Got exec: $exec
### Got args: @args
if ($exec eq 'echo') {
if ($redir) {
my $op = $args[$redir];
my @elems = @args[0..$redir-1];
if ($op eq '>') {
my $file = $args[$redir+1];
open my $out, "> $file" or
die "Can't open $file for writing: $!\n";
print $out "@elems\n";
close $out;
} elsif ($op eq '>>') {
my $file = $args[$redir+1];
open my $out, ">> $file" or
die "Can't open $file for writing: $!\n";
print $out "@elems\n";
close $out;
} elsif ($op eq '<') {
print "@elems\n";
} else {
die "Unexpected redirection operator: $op";
}
} else {
print "@args\n";
}
return 0;
} elsif ($exec eq 'rm') {
foreach my $file (@args) {
$file =~ s/\s+$//;
if (not unlink $file) {
warn "rm: cannot lstat `$file': $!\n";
$ExitCode = 1;
return;
}
}
return 0;
} elsif ($exec eq 'sleep') {
sleep ($args[0]);
} elsif ($exec eq 'pwd') {
require 'Cwd.pm';
print Cwd::cwd(), "\n";
} elsif ($exec eq 'cd') {
chdir $args[0];
} elsif ($exec eq 'touch') {
touch(@args);
$ExitCode = 0;
return;
} elsif ($exec eq ':') {
return;
} elsif ($exec eq 'exit') {
$ExitCode = $args[0] if defined $args[0];
exit($ExitCode);
} elsif ($exec =~ /make/i or ($args[0] and $args[0] =~ /make/i)) {
$ExitCode = system $exec, @args;
return;
} else {
warn "sh: unknown shell command: $exec";
$ExitCode = 1;
return;
}
}
|
