#!/usr/bin/perl

# import module
use Getopt::Long; 
use File::Basename;
use File::Spec;
    
$semicolon = ";"; # help out stupid emacs
$title = "Ardour Shortcuts";
$in_group_def = 0;
$group_name;
$group_text;
$group_key;
$group_number = 0;
%group_names;
%group_text;
%owner_bindings;
%group_owners;
%group_bindings;
%modifier_map;
%group_numbering;
%merge_bindings;

$platform = linux;
$winkey = 'Win';
$make_cheatsheet = 1;
$make_accelmap = 0;
$merge_from = "";
$html = 0;

GetOptions ("platform=s" => \$platform,
	    "winkey=s" => \$winkey,
	    "cheatsheet" => \$make_cheatsheet,
	    "accelmap" => \$make_accelmap,
	    "merge=s" => \$merge_from,
            "html" => \$html);

if ($platform eq "darwin") {

    $gtk_modifier_map{'PRIMARY'} = 'Primary'; # GTK supports Primary to allow platform-independent binding to the "primary" modifier, which on OS X is Command
    $gtk_modifier_map{'SECONDARY'} = 'Control';
    $gtk_modifier_map{'TERTIARY'} = 'Shift';
    $gtk_modifier_map{'LEVEL4'} = 'Mod1'; 

    # cs_modifier_map == "Cheat Sheet Modifier Map"
    # Used to control what gets shown in the
    # cheat sheet for a given (meta)-modifier

    $cs_modifier_map{'PRIMARY'} = 'Cmd';
    $cs_modifier_map{'SECONDARY'} = 'Control';
    $cs_modifier_map{'TERTIARY'} = 'Shift';
    $cs_modifier_map{'LEVEL4'} = 'Opt';

    # used to display what gets shown in the
    # cheat sheet for mouse bindings. Differs
    # from cs_modifier map in using shorter
    # abbreviations.
    
    $mouse_modifier_map{'PRIMARY'} = 'Cmd';
    $mouse_modifier_map{'SECONDARY'} = 'Ctrl';
    $mouse_modifier_map{'TERTIARY'} = 'Shift';
    $mouse_modifier_map{'LEVEL4'} = 'Opt';

} else {

    $gtk_modifier_map{'PRIMARY'} = 'Control';
    $gtk_modifier_map{'SECONDARY'} = 'Alt';
    $gtk_modifier_map{'TERTIARY'} = 'Shift';
    $gtk_modifier_map{'LEVEL4'} = $winkey;  # something like "Mod4><Super" 

    # cs_modifier_map == "Cheat Sheet Modifier Map"
    # Used to control what gets shown in the
    # cheat sheet for a given (meta)-modifier

    $cs_modifier_map{'PRIMARY'} = 'Control';
    $cs_modifier_map{'SECONDARY'} = 'Alt';
    $cs_modifier_map{'TERTIARY'} = 'Shift';
    $cs_modifier_map{'LEVEL4'} = 'Win';

    # used to display what gets shown in the
    # cheat sheet for mouse bindings. Differs
    # from cs_modifier map in using shorter
    # abbreviations.

    $mouse_modifier_map{'PRIMARY'} = 'Ctl';
    $mouse_modifier_map{'SECONDARY'} = 'Alt';
    $mouse_modifier_map{'TERTIARY'} = 'Shift';
    $mouse_modifier_map{'LEVEL4'} = 'Win';
}

%keycodes = ();

if ($html) {
    %keycodes = (
        'asciicircum' => '^',
        'apostrophe' => '\'',
        'bracketleft' => '[',
        'bracketright' => ']',
        'braceleft' => '{',
        'braceright' => '}',
        'backslash' => '\\',
        'slash' => '/',
        'rightanglebracket' => '&gt;',
        'leftanglebracket' => '&lt;',
        'ampersand' => '&',
        'comma' => ',',
        'period' => '.',
        'semicolon' => ';',
        'colon' => ':',
        'equal' => '=',
        'minus' => '-',
        'plus' => '+',
        'grave' => '`',
        'rightarrow' => '&rarr;',
        'leftarrow' => '&larr;',
        'uparrow' => '&uarr;',
        'downarrow' => '&darr;',
        'Page_Down' => 'PageDown',
        'Page_Up' => 'PageUp',
        'space' => 'space',
        'KP_Right' => 'KP-&rarr;',
        'KP_Left' => 'KP-&larr;',
        'KP_Up' => 'KP-&uarr;',
        'KP_Down' => 'KP-&darr;',
        'KP_0' => 'KP-0;',
        'greater' => '&gt;',
        'less' => '&lt;',
        );
} else {

    %keycodes = (
        'asciicircum' => '\\verb=^=',
        'apostrophe' => '\'',
        'bracketleft' => '[',
        'bracketright' => ']',
        'braceleft' => '\\{',
        'braceright' => '\\}',
        'backslash' => '$\\backslash$',
        'slash' => '/',
        'rightanglebracket' => '>',
        'leftanglebracket' => '<',
        'ampersand' => '\\&',
        'comma' => ',',
        'period' => '.',
        'semicolon' => ';',
        'colon' => ':',
        'equal' => '=',
        'minus' => '-',
        'plus' => '+',
        'grave' => '`',
        'rightarrow' => '$\rightarrow$',
        'leftarrow' => '$\\leftarrow$',
        'uparrow' => '$\\uparrow$',
        'downarrow' => '$\\downarrow$',
        'Page_Down' => 'Page Down',
        'Page_Up' => 'Page Up',
        'space' => 'space',
        'KP_' => 'KP$\_$',
        'greater' => '>',
        'less' => '<',
    );
}

if ($merge_from) {
    open (BINDINGS, $merge_from) || die ("merge from bindings: file not readable");
    while (<BINDINGS>) {
	next if (/^$semicolon/);
	if (/^\(gtk_accel/) {
	    chop; # newline
	    chop; # closing parenthesis
	    s/"//g;
	    ($junk, $action, $binding) = split;
	    $merge_bindings{$action} = $binding;
	}
    }
    close (BINDINGS);
}

if ($make_accelmap && !$merge_from) {
    print "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
}

$bindings_name = basename ($ARGV[0]);
$bindings_name =~ s/.bindings\.in$//;

open SOURCE, "<", $ARGV[0] or die $!;

while (<SOURCE>) {
    next if /^$semicolon/;

    if (/^\$/) {
	s/^\$//;
	$title = $_;
	next;
    }

    if (/^%/) {
	
	if ($in_group_def) {
	    chop $group_text;
	    $group_names{$group_key} = $group_name;
	    $group_text{$group_key} = $group_text;
	    $group_numbering{$group_key} = $group_number;
	    # each binding entry is 2 element array. bindings
	    # are all collected into a container array. create
	    # the first dummy entry so that perl knows what we
	    # are doing.
	    $group_bindings{$group_key} = [ [] ];
	}

	s/^%//;
	chop;
	($group_key,$owner,$group_name) = split (/\s+/, $_, 3);
	if ($make_accelmap) {
	    if (!exists ($owner_bindings{$owner})) {
		$owner_bindings{$owner} = [ [] ];
	    }
	    $group_owners{$group_key} = $owner;
	}
	$group_number++;
	$group_text = "";
	$in_group_def = 1;
	next;
    }

    if ($in_group_def) {
	if (/^@/) {
	    chop $group_text;
	    $group_names{$group_key} = $group_name;
	    $group_text{$group_key} = $group_text;
	    $in_group_def = 0;
	} else {
	    next if (/^[ \t]+$/);
	    $group_text .= $_;
	    $group_text;
	    next;
	}
    }

    if (/^@/) {
	s/^@//;
	chop;
	($key,$action,$binding,$text) = split (/\|/, $_, 4);

	$gkey = $key;
	$gkey =~ s/^-//;
	$owner = $group_owners{$gkey};

	# substitute bindings

	$gtk_binding = $binding;

	if ($merge_from) {
	    $lookup = "<Actions>/" . $action;
	    if ($merge_bindings{$lookup}) {
		$binding = $merge_bindings{$lookup};
	    } else {
		if ($key =~ /^\+/) {
		    # forced inclusion of bindings from template
		} else {
		    # this action is not defined in the merge from set, so forget it 
		    next;
		}
	    }
	} 

	# print the accelmap output

	if ($key =~ /^\+/) {
	    # remove + and don't print it in the accelmap
	    $key =~ s/^\+//;
	} else {
	    # include this in the accelmap if it is part of a group that has an "owner"
	    if (!$merge_from && $make_accelmap && exists ($owner_bindings{$owner})) {

		$b = $binding;
		$b =~ s/<@//g;
		$b =~ s/@>//g;
		$b =~ s/PRIMARY/Primary-/;
		$b =~ s/SECONDARY/Secondary-/;
		$b =~ s/TERTIARY/Tertiary-/;
		$b =~ s/LEVEL4/Level4-/;
		
		$bref = $owner_bindings{$owner};
		push (@$bref, [ $action, $b ]);
	    }
	}

	if ($key =~ /^-/) {
	    # do not include this binding in the cheat sheet
	    next;
	}

	$bref = $group_bindings{$key};
	push (@$bref, [$binding, $text]);

	next;
    }

    next;
}

if ($make_accelmap) {
    print "<BindingSet name=\"" . $bindings_name . "\">\n";
    
    foreach $owner (keys %owner_bindings) {
	print " <Bindings name=\"$owner\">\n  <Press\n";
	$bindings = $owner_bindings{$owner};
	shift (@$bindings); # remove initial empty element
	for my $binding (@$bindings) {
	    print '   <Binding key="' . @$binding[1] . '" action="' . @$binding[0] . "\"/>\n";
	}
        print "  </Press>\n </Bindings>\n";
    }

    # merge in the "fixed" bindings that are not defined by the argument given to this program
    # namely, the step editor and the mixer windows

    foreach $hardcoded_bindings ("mixer.bindings", "step_editing.bindings") {
	$path = File::Spec->catfile (dirname ($ARGV[0]), $hardcoded_bindings);
	open HARDCODED, "<", $path or die $!;
	while (<HARDCODED>) {
	    print $_;
	}
	close HARDCODED;
    }
    
    print "</BindingSet/>\n";
}

if ($make_accelmap || !$make_cheatsheet) {
    exit 0;
}

if ($html) {

    @groups_sorted_by_number = sort { $group_numbering{$a} <=> $group_numbering{$b} } keys %group_numbering; 
    
    foreach $gk (@groups_sorted_by_number) {

        if ($gk =~ /^m/) {
            # mouse stuff - ignore
            next;
        }

        # $bref is a reference to the array of arrays for this group
        $bref = $group_bindings{$gk};
        
        if (scalar @$bref > 1) {
            
            $name = $group_names{$gk};
            $name =~ s/\\linebreak.*//;
            $name =~ s/\\&/&/;
            $name =~ s/\$\\_\$/-/g;
            $name =~ s/\\[a-z]+ //g;
            $name =~ s/[{}]//g;
            $name =~ s/\\par//g;

            print "<h3>$name</h3>\n";

            $gtext = $group_text{$gk};
            $gtext =~ s/\\linebreak.*//;
            $gtext =~ s/\\&/&/;
            $gtext =~ s/\$\\_\$/-/g;
            $gtext =~ s/\\[a-z]+ //g;
            $gtext =~ s/[{}]//g;
            $gtext =~ s/\\par//g;
            
            if (!($gtext eq  "")) {
                print "$gtext\n\n";
            }
            
            # ignore the first entry, which was empty
            
            shift (@$bref);
            
            # set up the list
            
            print "<dl class=\"bindings\">\n";
            
            # sort the array of arrays by the descriptive text for nicer appearance,
            # and print them
            
            for $bbref (sort { @$a[1] cmp @$b[1] } @$bref) {
                # $bbref is a reference to an array
                
                $binding = @$bbref[0];
                $text = @$bbref[1];

                if ($binding =~ /:/) { # mouse binding with "where" clause
                    ($binding,$where) = split (/:/, $binding, 2);
                }
                
                foreach $k (keys %cs_modifier_map) {
                    $binding =~ s/\@$k\@/$cs_modifier_map{$k}/;
                }

                # remove braces for HTML

                $binding =~ s/></\+/g;
                $binding =~ s/^<//;
                $binding =~ s/>/\+/;
                
                # substitute keycode names for something printable
                
                $re = qr/${ \(join'|', map quotemeta, keys %keycodes)}/;
                $binding =~ s/($re)/$keycodes{$1}/g;

                # tidy up description

                $descr = @$bbref[1];
                $descr =~ s/\\linebreak.*//;
                $descr =~ s/\\&/&/;
                $descr =~ s/\$\\_\$/-/g;
                $descr =~ s/\\[a-z]+ //g;
                $descr =~ s/[{}]//g;
                $descr =~ s/\\par//g;

                print "<dt>$descr</dt><dd>$binding</dd>\n";
            }
            
            print "</dl>\n";
        
        }
    }
    print "&nbsp; <!-- remove this if more text is added below -->\n";
    exit 0;
}


# Now print the cheatsheet

$boilerplate_header = <<END_HEADER;
\\documentclass[10pt,landscape]{article}
%\\documentclass[10pt,landscape,a4paper]{article}
%\\documentclass[10pt,landscape,letterpaper]{article}
\\usepackage{multicol}
\\usepackage{calc}
\\usepackage{ifthen}
\\usepackage{palatino}
\\usepackage{geometry}

\\setlength{\\parskip}{0pt}
\\setlength{\\parsep}{0pt}
\\setlength{\\headsep}{0pt}
\\setlength{\\topskip}{0pt}
\\setlength{\\topmargin}{0pt}
\\setlength{\\topsep}{0pt}
\\setlength{\\partopsep}{0pt}

% This sets page margins to .5 inch if using letter paper, and to 1cm
% if using A4 paper. (This probably isnott strictly necessary.)
% If using another size paper, use default 1cm margins.
\\ifthenelse{\\lengthtest { \\paperwidth = 11in}}
	{ \\geometry{top=.5in,left=.5in,right=.5in,bottom=.5in} }
	{\\ifthenelse{ \\lengthtest{ \\paperwidth = 297mm}}
		{\\geometry{top=1cm,left=1cm,right=1cm,bottom=1cm} }
		{\\geometry{top=1cm,left=1cm,right=1cm,bottom=1cm} }
	}

% Turn off header and footer
\\pagestyle{empty}
 
% Redefine section commands to use less space
\\makeatletter
\\renewcommand{\\section}{\\\@startsection{section}{1}{0mm}%
                                {-1ex plus -.5ex minus -.2ex}%
                                {0.5ex plus .2ex}%
                                {\\normalfont\\large\\bfseries}}
\\renewcommand{\\subsection}{\\\@startsection{subsection}{2}{0mm}%
                                {-1explus -.5ex minus -.2ex}%
                                {0.5ex plus .2ex}%
                                {\\normalfont\\normalsize\\bfseries}}
\\renewcommand{\\subsubsection}{\\\@startsection{subsubsection}{3}{0mm}%
                                {-1ex plus -.5ex minus -.2ex}%
                                {1ex plus .2ex}%
                                {\\normalfont\\small\\bfseries}}
\\makeatother

% Do not print section numbers% Do not print section numbers
\\setcounter{secnumdepth}{0}

\\setlength{\\parindent}{0pt}
\\setlength{\\parskip}{0pt plus 0.5ex}

%-------------------------------------------

\\begin{document}
\\newlength{\\MyLen}
\\raggedright
\\footnotesize
\\begin{multicols}{3}
END_HEADER

$boilerplate_footer = <<END_FOOTER;
\\rule{0.3\\linewidth}{0.25pt}
\\scriptsize

Copyright \\copyright\\ 2013 ardour.org

% Should change this to be date of file, not current date.

http://manual.ardour.org

\\end{multicols}
\\end{document}
END_FOOTER

if ($make_cheatsheet) {
    print $boilerplate_header;
    print "\\begin{center}\\Large\\bf $title \\end{center}\n";
}

@groups_sorted_by_number = sort { $group_numbering{$a} <=> $group_numbering{$b} } keys %group_numbering; 

foreach $gk (@groups_sorted_by_number) {
    # $bref is a reference to the array of arrays for this group
    $bref = $group_bindings{$gk};

    if (scalar @$bref > 1) {
	print "\\section{$group_names{$gk}}\n";

	if (!($group_text{$gk} eq  "")) {
	    print "$group_text{$gk}\n\\par\n";
	}
	
	# ignore the first entry, which was empty

	shift (@$bref);

	# find the longest descriptive text (this is not 100% accuracy due to typography)

	$maxtextlen = 0;
	$maxtext = "";

	for $bbref (@$bref) {
	    # $bbref is a reference to an array
	    $text = @$bbref[1];
	    
	    #
	    # if there is a linebreak, just use everything up the linebreak
	    # to determine the width
	    #

	    if ($text =~ /\\linebreak/) {
		$matchtext = s/\\linebreak.*//;
	    } else {
		$matchtext = $text;
	    }
	    if (length ($matchtext) > $maxtextlen) {
		$maxtextlen = length ($matchtext);
		$maxtext = $matchtext;
	    }
	}

	if ($gk =~ /^m/) {
	    # mouse mode: don't extend max text at all - space it tight
	    $maxtext .= ".";
	} else {
	    $maxtext .= "....";
	}

	# set up the table

	print "\\settowidth{\\MyLen}{\\texttt{$maxtext}}\n";
	print "\\begin{tabular}{\@{}p{\\the\\MyLen}% 
                                \@{}p{\\linewidth-\\the\\MyLen}%
                                \@{}}\n";

	# sort the array of arrays by the descriptive text for nicer appearance,
	# and print them

	for $bbref (sort { @$a[1] cmp @$b[1] } @$bref) {
	    # $bbref is a reference to an array

	    $binding = @$bbref[0];
	    $text = @$bbref[1];

	    if ($binding =~ /:/) { # mouse binding with "where" clause
		($binding,$where) = split (/:/, $binding, 2);
	    }

	    if ($gk =~ /^m/) {
		# mouse mode - use shorter abbrevs
		foreach $k (keys %mouse_modifier_map) {
		    $binding =~ s/\@$k\@/$mouse_modifier_map{$k}/;
		}
	    } else {
		foreach $k (keys %cs_modifier_map) {
		    $binding =~ s/\@$k\@/$cs_modifier_map{$k}/;
		}
	    }

	    $binding =~ s/></\+/g;
	    $binding =~ s/^<//;
	    $binding =~ s/>/\+/;

	    # substitute keycode names for something printable

	    $re = qr/${ \(join'|', map quotemeta, keys %keycodes)}/;
	    $binding =~ s/($re)/$keycodes{$1}/g;

	    # split up mouse bindings to "click" and "where" parts

	    if ($gk eq "mobject") {
		print "{\\tt @$bbref[1] } & {\\tt $binding} {\\it $where}\\\\\n";
	    } else {
		print "{\\tt @$bbref[1] } & {\\tt $binding} \\\\\n";
	    }
	}

	print "\\end{tabular}\n";

    }
}

print $boilerplate_footer;

exit 0;