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lib/Makefile/Update/CMakefile.pm  view on Meta::CPAN

package Makefile::Update::CMakefile;
# ABSTRACT: Update lists of files in CMake variables.

use Exporter qw(import);
our @EXPORT = qw(update_cmakefile);

use strict;
use warnings;

our $VERSION = '0.4'; # VERSION


# Variables in our input files use make-like $(var) syntax while CMake uses
# shell-like ${var}, so convert to the target format.
sub _var_to_cmake
{
    my ($var) = @_;
    $var =~ s/\((\w+)\)/{$1}/g;
    $var;
}


sub update_cmakefile
{
    my ($in, $out, $vars) = @_;

    # Variable whose contents is being currently replaced.
    my $var;

    # Hash with files defined for the specified variable as keys and 0 or 1
    # depending on whether we have seen them in the input file as values.
    my %files;

    # Set to 1 if we made any changes.
    my $changed = 0;
    while (<$in>) {
        # Preserve the original line to be able to output it with any comments
        # that we strip below.
        my $line_orig = $_;

        # Get rid of white space and comments.
        chomp;
        s/^\s+//;
        s/\s+$//;
        s/ *#.*$//;

        # Are we inside a variable definition?
        if (defined $var) {
            if (/^\)$/) {
                # End of variable definition, check if we have any new files.
                #
                # TODO Insert them in alphabetical order.
                while (my ($file, $seen) = each(%files)) {
                    if (!$seen) {
                        # This file wasn't present in the input, add it.
                        # TODO Use proper indentation.
                        print $out "    $file\n";

                        $changed = 1;
                    }
                }

                undef $var;
            } elsif ($_) {
                # We're inside a variable definition.
                if (not exists $files{$_}) {
                    # This file was removed.
                    $changed = 1;
                    next;
                }

                if ($files{$_}) {
                    warn qq{Duplicate file "$_" in the definition of the } .
                         qq{variable "$var" at line $.\n}
                } else {
                    $files{$_} = 1;
                }
            }
        } elsif (/^set *\( *(\w+)$/ && exists $vars->{$1}) {
            # Start of a new variable definition.
            $var = $1;

            %files = map { _var_to_cmake($_) => 0 } @{$vars->{$var}};