gri3-wm/i3-save-tree

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#!/usr/bin/env perl
# vim:ts=4:sw=4:expandtab
#
# © 2013 Michael Stapelberg
#
# Requires perl ≥ v5.10, AnyEvent::I3 and JSON::XS
use strict;
use warnings qw(FATAL utf8);
use Data::Dumper;
use IPC::Open2;
use POSIX qw(locale_h);
use File::Find;
use File::Basename qw(basename);
use File::Temp qw(tempfile);
use List::Util qw(first);
use Getopt::Long;
use Pod::Usage;
use AnyEvent::I3;
use JSON::XS;
use List::Util qw(first);
use Encode qw(decode);
use v5.10;
use utf8;
use open ':encoding(UTF-8)';
binmode STDOUT, ':utf8';
binmode STDERR, ':utf8';
my $workspace;
my $output;
my $result = GetOptions(
'workspace=s' => \$workspace,
'output=s' => \$output,
'version' => sub {
say "i3-save-tree 0.1 © 2013 Michael Stapelberg";
exit 0;
},
'help' => sub {
pod2usage(-exitval => 0);
});
die "Could not parse command line options" unless $result;
if (defined($workspace) && defined($output)) {
die "Only one of --workspace or --output can be specified";
}
$workspace = decode('utf-8', $workspace);
$output = decode('utf-8', $output);
my $i3 = i3();
if (!$i3->connect->recv) {
die "Could not connect to i3";
}
sub get_current_workspace {
my $current = first { $_->{focused} } @{$i3->get_workspaces->recv};
return $current->{name};
}
if (!defined($workspace) && !defined($output)) {
$workspace = get_current_workspace();
}
sub filter_containers {
my ($tree, $pred) = @_;
$_ = $tree;
return $tree if $pred->();
for my $child (@{$tree->{nodes}}, @{$tree->{floating_nodes}}) {
my $result = filter_containers($child, $pred);
return $result if defined($result);
}
return undef;
}
sub leaf_node {
my ($tree) = @_;
return $tree->{type} eq 'con' &&
@{$tree->{nodes}} == 0 &&
@{$tree->{floating_nodes}} == 0;
}
my %allowed_keys = map { ($_, 1) } qw(
type
fullscreen_mode
layout
border
current_border_width
floating
percent
nodes
floating_nodes
name
geometry
window_properties
marks
rect
);
sub strip_containers {
my ($tree) = @_;
# layout is not relevant for a leaf container
delete $tree->{layout} if leaf_node($tree);
# fullscreen_mode conveys no state at all, it can either be 0 or 1 and the
# default is _always_ 0, so skip noop entries.
delete $tree->{fullscreen_mode} if $tree->{fullscreen_mode} == 0;
# names for non-leafs are auto-generated and useful only for i3 debugging
delete $tree->{name} unless leaf_node($tree);
delete $tree->{geometry} if zero_rect($tree->{geometry});
# Retain the rect for floating containers to keep their positions.
delete $tree->{rect} unless $tree->{type} eq 'floating_con';
delete $tree->{current_border_width} if $tree->{current_border_width} == -1;
for my $key (keys %$tree) {
next if exists($allowed_keys{$key});
delete $tree->{$key};
}
for my $key (qw(nodes floating_nodes)) {
$tree->{$key} = [ map { strip_containers($_) } @{$tree->{$key}} ];
}
return $tree;
}
my $json_xs = JSON::XS->new->pretty(1)->allow_nonref->space_before(0)->canonical(1);
sub zero_rect {
my ($rect) = @_;
return $rect->{x} == 0 &&
$rect->{y} == 0 &&
$rect->{width} == 0 &&
$rect->{height} == 0;
}
# Dumps the containers in JSON, but with comments to explain the user what she
# needs to fix.
sub dump_containers {
my ($tree, $ws, $last) = @_;
$ws //= "";
say $ws . '{';
$ws .= (' ' x 4);
if (!leaf_node($tree)) {
my $desc = $tree->{layout} . ' split container';
if ($tree->{type} ne 'con') {
$desc = $tree->{type};
}
say "$ws// $desc with " . @{$tree->{nodes}} . " children";
}
# Turn “window_properties” into “swallows” expressions, but only for leaf
# nodes. It only makes sense for leaf nodes to swallow anything.
if (leaf_node($tree)) {
my $swallows = {};
for my $property (keys %{$tree->{window_properties}}) {
$swallows->{$property} = '^' . quotemeta($tree->{window_properties}->{$property}) . '$';
}
$tree->{swallows} = [ $swallows ];
}
delete $tree->{window_properties};
my @keys = sort keys %$tree;
for (0 .. (@keys-1)) {
my $key = $keys[$_];
# Those are handled recursively, not printed.
next if $key eq 'nodes' || $key eq 'floating_nodes';
# JSON::XSs encode appends a newline
chomp(my $val = $json_xs->encode($tree->{$key}));
# Fix indentation. Keep in mind we are producing output to be
# read/modified by a human.
$val =~ s/^/$ws/mg;
$val =~ s/^\s+//;
# Comment out all swallows criteria, they are just suggestions.
if ($key eq 'swallows') {
$val =~ s,^(\s*)\s{3}",\1// ",gm;
}
# Append a comma unless this is the last value.
# Ugly, but necessary so that we can print all values before recursing.
my $comma = ($_ == (@keys-1) &&
@{$tree->{nodes}} == 0 &&
@{$tree->{floating_nodes}} == 0 ? '' : ',');
say qq#$ws"$key": $val$comma#;
}
for my $key (qw(nodes floating_nodes)) {
my $num = scalar @{$tree->{$key}};
next if !$num;
say qq#$ws"$key": [#;
for (0 .. ($num-1)) {
dump_containers(
$tree->{$key}->[$_],
$ws . (' ' x 4),
($_ == ($num-1)));
}
say qq#$ws]#;
}
$ws =~ s/\s{4}$//;
say $ws . ($last ? '}' : '},');
}
my $tree = $i3->get_tree->recv;
my $dump;
if (defined($workspace)) {
$dump = filter_containers($tree, sub {
$_->{type} eq 'workspace' && ($_->{name} eq $workspace || ($workspace =~ /^\d+$/ && $_->{num} eq $workspace))
});
} else {
$dump = filter_containers($tree, sub {
$_->{type} eq 'output' && $_->{name} eq $output
});
# Get the outputs content container (living beneath dockarea containers).
$dump = first { $_->{type} eq 'con' } @{$dump->{nodes}};
}
$dump = strip_containers($dump);
say "// vim:ts=4:sw=4:et";
for my $key (qw(nodes floating_nodes)) {
for (0 .. (@{$dump->{$key}} - 1)) {
dump_containers($dump->{$key}->[$_], undef, 1);
# Newlines separate containers so that one can use { and } in vim to
# jump out of the current container.
say '';
}
}
=encoding utf-8
=head1 NAME
i3-save-tree - save (parts of) the layout tree for restoring
=head1 SYNOPSIS
i3-save-tree [--workspace=name|number] [--output=name]
=head1 DESCRIPTION
Dumps a workspace (or an entire output) to stdout. The data is supposed to be
edited a bit by a human, then later fed to i3 via the append_layout command.
The append_layout command will create placeholder windows, arranged in the
layout the input file specifies. Each container should have a swallows
specification. When a window is mapped (made visible on the screen) that
matches the specification, i3 will put it into that place and kill the
placeholder.
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If neither argument is specified, the currently focused workspace will be used.
=head1 OPTIONS
=over
=item B<--workspace=name|number>
Specifies the workspace that should be dumped, e.g. 1. This can either be a
name or the number of a workspace.
=item B<--output=name>
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Specifies the output that should be dumped, e.g. LVDS-1.
=back
=head1 VERSION
Version 0.1
=head1 AUTHOR
Michael Stapelberg, C<< <michael at i3wm.org> >>
=head1 LICENSE AND COPYRIGHT
Copyright 2013 Michael Stapelberg.
This program is free software; you can redistribute it and/or modify it
under the terms of the BSD license.
=cut