Created
June 14, 2020 08:13
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use v6; | |
BEGIN { | |
class X::Shell::CommandNotFound is Exception { | |
has $.cmd; | |
method message { 'The shell command ⟨' ~ $.cmd ~ '⟩ was not found.' } | |
} | |
class X::Shell::NoAccess is Exception { | |
has $.cmd; | |
method message { 'The shell command ⟨' ~ $.cmd ~ '⟩ is not accessible.' } | |
} | |
package Shell {} | |
sub shell-command(IO() $cmd-path) { | |
my $cmd-name = $cmd-path.basename; | |
X::Shell::CommandNotFound.new(:cmd($cmd-name)).throw if !$cmd-path.e; | |
X::Shell::NoAccess.new(:cmd($cmd-name)).throw if !$cmd-path.x; | |
my $Exception = Metamodel::ClassHOW.new_type(:name($cmd-name)); | |
$Exception.HOW.add_parent($Exception, Exception); | |
$Exception.HOW.add_attribute($Exception, Attribute.new(:name<$.exitcode>, :type(Int), :package($Exception), :has_accessor)); | |
$Exception.HOW.add_attribute($Exception, Attribute.new(:name<$.stderr>, :type(Str), :package($Exception), :has_accessor)); | |
$Exception.HOW.add_method($Exception, 'message', my method { 'Shell command ⟨' ~ self.^name ~ '⟩ finished with non-zero exitcode of ' ~ self.exitcode ~ '.' } ); | |
$Exception.HOW.compose($Exception); | |
X::Shell::<ls> := $Exception; | |
Shell::«$cmd-name» := sub (|c) { | |
my $proc = run $cmd-name, |c, :out, :err; | |
if $proc.exitcode != 0 { # this makes the exception resumeable | |
my $e = X::Shell::«$cmd-name»; | |
$e.new(:exitcode($proc.exitcode), :stderr($proc.err.slurp)).throw | |
} else { | |
$proc.out.slurp | |
} | |
} | |
} | |
my \e = shell-command('/bin/ls'); | |
} | |
Shell::ls('/home/not there', '-l'); | |
Shell::ls('/home/dex').lines.tail(10).say; | |
CATCH { | |
when X::Shell::ls { warn .stderr, .backtrace; .resume } | |
when X::Shell { warn .^name, ': ', .message; .resume } | |
} | |
# say $e.^attributes; | |
# dd $e.new(:exitcode(1)).message; |
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