#!/usr/bin/env perl
# docs-drift compares the toml-test suite counts the documentation names with
# the run this repository produces now. A corpus change moves the counts, and
# README.md and docs/ARCHITECTURE.md quote them; this is the check that keeps
# the quotation honest. Builtins only, and the toml-test binary on PATH.

use v5.40;

my $out = qx{toml-test test -decoder=bin/interpres-decode -encoder='bin/interpres-decode -encode' -toml=1.1 2>&1};
die "docs-drift: toml-test failed to run; build the adapter first (just build)\n"
    if !defined $out || $out =~ /not found|No such file/;

my ($valid) = $out =~ /valid tests:\s+(\d+) passed/;
my ($invalid) = $out =~ /invalid tests:\s+(\d+) passed/;
die "docs-drift: could not read the suite counts from the toml-test output\n"
    unless defined $valid && defined $invalid;
print "docs-drift: the suite now stands at $valid valid and $invalid invalid cases\n";

my $drift = 0;
for my $file ('README.md', 'docs/ARCHITECTURE.md') {
    open(my $fh, '<', $file) or die "docs-drift: cannot read $file: $!\n";
    my $text = do { local $/; <$fh> };
    close($fh);
    while ($text =~ /(\d+)\s+(valid|invalid)/g) {
        my ($quoted, $kind) = ($1, $2);
        my $live = $kind eq 'valid' ? $valid : $invalid;
        if ($quoted != $live) {
            print "docs-drift: $file quotes $quoted $kind cases, the suite says $live\n";
            $drift = 1;
        }
    }
}
die "docs-drift: the documentation has drifted from the suite\n" if $drift;
print "docs-drift: the documentation matches the suite\n";