#!/usr/bin/env perl
# SPDX-FileCopyrightText: 2026 GPForum Contributors
# SPDX-License-Identifier: BSD-3-Clause

package main;

use v5.40;

use English qw(-no_match_vars);
use File::Find;

our $VERSION = '0.001';

my @inputs = @ARGV ? @ARGV : qw(bin lib script t);
my @roots  = grep { -d } @inputs;
my @files  = grep { _is_perl_file($_) } grep { -f } @inputs;

# A gate that checked nothing has not passed: run from the wrong directory,
# it fails rather than report every file compiling.
if ( !@roots && !@files ) {
    warn 'perl-syntax-check: no Perl roots found; nothing was checked' . "\n";
    exit 1;
}

find(
    {
        no_chdir => 1,
        wanted   => sub {
            return if !-f $File::Find::name;
            return if $File::Find::name =~ m{/(?:local|blib|cover_db)/}msx;
            return if !_is_perl_file($File::Find::name);

            push @files, $File::Find::name;
        },
    },
    @roots
);

if ( !@files ) {
    warn 'perl-syntax-check: no Perl files found; nothing was checked' . "\n";
    exit 1;
}

my $failed = 0;
for my $file ( sort @files ) {
    system $EXECUTABLE_NAME, '-Ilib', '-It/lib', '-Iscript/lib', '-c', $file;
    if ( $CHILD_ERROR != 0 ) {
        $failed = 1;
    }
}

exit( $failed ? 1 : 0 );

sub _is_perl_file {
    my ($file) = @_;

    return 1 if $file =~ m{[.](?:pm|pl|t)\z}msx;
    return 1 if $file =~ m{\Abin/}msx;
    return 1 if $file =~ m{\Ascript/}msx && _has_perl_shebang($file);

    return 0;
}

sub _has_perl_shebang {
    my ($file) = @_;

    open my $handle, '<', $file or return 0;
    my $first_line = <$handle> || q{};
    close $handle or return 0;

    return $first_line =~ /\A [#]! .* perl \b/msx ? 1 : 0;
}