-
-
Notifications
You must be signed in to change notification settings - Fork 373
/
Main.pm
173 lines (154 loc) Β· 6.27 KB
/
Main.pm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
# TODO:
# * Align number parsing to STD
# * Rakudo's .Numeric
# * complex numbers
# * Rakudo's grammar
# * val()
# * Strengthen val()
# * Make val() available globally
# * $?USAGE
# * Create $?USAGE at compile time
# * Make $?USAGE available globally
# * Command-line parsing
# * Allow both = and space before argument of double-dash args
# * Comma-separated list values
# * Allow exact Perl 6 forms, quoted away from shell
# * Fix remaining XXXX
my sub MAIN_HELPER($retval = 0) is hidden_from_backtrace {
# Do we have a MAIN at all?
my $m = callframe(1).my<&MAIN>;
return $retval unless $m;
# Temporary stand-in for magic val() routine
my sub hack-val ($v) {
# Convert to native type if appropriate
my $val;
if $v ~~ /^ 'Bool::'?'False' $/ { $val := Bool::False }
elsif $v ~~ /^ 'Bool::'?'True' $/ { $val := Bool::True }
elsif $v.Numeric.defined { $val := +$v }
else { return $v }
# Mix in original stringifications
my role orig-string[$orig] {
method Str () { $orig.Str }
multi method gist (Mu:D:) { $orig.gist }
};
return $val but orig-string[$v];
}
# Convert raw command line args into positional and named args for MAIN
my sub process-cmd-args (@args is copy) {
my (@positional-arguments, %named-arguments);
while (@args) {
my $passed-value = @args.shift;
if $passed-value ~~ /^ ( '--' | '-' | ':' ) ('/'?) (<-[0..9\.]> .*) $/ {
my ($switch, $negate, $arg) = (~$0, ?((~$1).chars), ~$2);
if $arg.index('=').defined {
my ($name, $value) = $arg.split('=', 2);
$value = hack-val($value);
$value = $value but False if $negate;
%named-arguments.push: $name => $value;
} else {
%named-arguments.push: $arg => !$negate;
}
} else {
@args.unshift($passed-value) unless $passed-value eq '--';
@positional-arguments.push: @args.map: &hack-val;
last;
}
}
$PROCESS::ARGFILES = IO::ArgFiles.new(:args(@args));
return @positional-arguments, %named-arguments;
}
# Generate $?USAGE string (default usage info for MAIN)
my sub gen-usage () {
my @help-msgs;
my sub strip_path_prefix($name) {
my $SPEC := $*SPEC;
my ($vol, $dir, $base) = $SPEC.splitpath($name);
$dir = $SPEC.canonpath($dir);
for $SPEC.path() -> $elem {
if $SPEC.catpath($vol, $elem, $base).IO.x {
return $base if $SPEC.canonpath($elem) eq $dir;
# Shadowed command found in earlier PATH element
return $name;
}
}
# Not in PATH
return $name;
}
my $prog-name = $*PROGRAM_NAME eq '-e' ?? "-e '...'" !! strip_path_prefix($*PROGRAM_NAME);
for $m.candidates -> $sub {
next if $sub.?is_hidden_from_USAGE;
my (@required-named, @optional-named, @positional, $docs);
for $sub.signature.params -> $param {
my $argument;
if $param.named {
my @names = $param.named_names.reverse;
$argument = @names.map({($^n.chars == 1 ?? '-' !! '--') ~ $^n}).join('|');
$argument ~= "=<{$param.type.^name}>" unless $param.type === Bool;
if $param.optional {
@optional-named.push("[$argument]");
}
else {
@required-named.push($argument);
}
}
else {
my $constraints = $param.constraint_list.map(*.gist).join(' ');
my $simple-const = $constraints && $constraints !~~ /^_block/;
$argument = $param.name ?? '<' ~ substr($param.name,1) ~ '>' !!
$simple-const ?? $constraints !!
'<' ~ $param.type.^name ~ '>' ;
$argument = "[$argument ...]" if $param.slurpy;
$argument = "[$argument]" if $param.optional;
@positional.push($argument);
}
}
if $sub.WHY {
$docs = '-- ' ~ $sub.WHY.contents
}
my $msg = join(' ', $prog-name, @required-named, @optional-named, @positional, $docs // '');
@help-msgs.push($msg);
}
my $usage = "Usage:\n" ~ @help-msgs.map(' ' ~ *).join("\n");
return $usage;
}
sub has-unexpected-named-arguments($signature, %named-arguments) {
my @named-params = $signature.params.grep: *.named;
return False if @named-params.grep: *.slurpy;
my %accepts-argument = @named-params.map({ .named_names }) Z=> 1 xx *;
for %named-arguments.keys -> $name {
return True if !%accepts-argument{$name}
}
return False;
}
# Process command line arguments
my ($p, $n) = process-cmd-args(@*ARGS).lol;
# Generate default $?USAGE message
my $usage;
my $?USAGE := Proxy.new(
FETCH => -> | { $usage || ($usage = gen-usage()) },
STORE => -> | { }
);
# Get a list of candidates that match according to the dispatcher
my @matching_candidates = $m.cando(Capture.new(list => $p, hash => $n));
# Sort out all that would fail due to binding
@matching_candidates .=grep: {!has-unexpected-named-arguments($_.signature, $n)};
# If there are still some candidates left, try to dispatch to MAIN
if +@matching_candidates {
return $m(|@($p), |%($n));
}
# We could not find the correct MAIN to dispatch to!
# Let's try to run a user defined USAGE sub
my $h = callframe(1).my<&USAGE>;
return $h() if $h;
# We could not find a user defined USAGE sub!
# Let's display the default USAGE message
if $n<help> {
$*OUT.say($?USAGE);
exit 1;
}
else {
$*ERR.say($?USAGE);
exit 2;
}
}
# vim: ft=perl6 expandtab sw=4