From 4eb6b48c8eccd70250833118461bffd4425a47ea Mon Sep 17 00:00:00 2001 From: Michael Stapelberg Date: Sun, 9 Dec 2012 17:04:01 +0100 Subject: [PATCH] add contrib/i3-dmenu-desktop, a script which runs .desktop files via dmenu See "pod2man --utf8 contrib/i3-dmenu-desktop | man /dev/stdin" for documentation. Use a line like this in your i3 config file: bindsym Mod1+p exec --no-startup-id ~/i3/contrib/i3-dmenu-desktop --- contrib/i3-dmenu-desktop | 445 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 445 insertions(+) create mode 100755 contrib/i3-dmenu-desktop diff --git a/contrib/i3-dmenu-desktop b/contrib/i3-dmenu-desktop new file mode 100755 index 00000000..13b616ee --- /dev/null +++ b/contrib/i3-dmenu-desktop @@ -0,0 +1,445 @@ +#!/usr/bin/env perl +# vim:ts=4:sw=4:expandtab +# +# © 2012 Michael Stapelberg +# +# No dependencies except for perl ≥ v5.10 + +use strict; +use warnings; +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 Getopt::Long; +use Pod::Usage; +use v5.10; +use utf8; +use open ':encoding(utf8)'; + +binmode STDOUT, ':utf8'; +binmode STDERR, ':utf8'; + +# reads in a whole file +sub slurp { + open(my $fh, '<', shift) or die "$!"; + local $/; + <$fh>; +} + +my $dmenu_cmd = 'dmenu -i'; +my $result = GetOptions( + 'dmenu=s' => \$dmenu_cmd, + 'version' => sub { + say "dmenu-desktop 1.0 © 2012 Michael Stapelberg"; + exit 0; + }, + 'help' => sub { + pod2usage(-exitval => 0); + }); + +die "Could not parse command line options" unless $result; + +# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ +# ┃ Convert LC_MESSAGES into an ordered list of suffixes to search for in the ┃ +# ┃ .desktop files (e.g. “Name[de_DE@euro]” for LC_MESSAGES=de_DE.UTF-8@euro ┃ +# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ + +# For details on how the transformation of LC_MESSAGES to a list of keys that +# should be looked up works, refer to “Localized values for keys” of the +# “Desktop Entry Specification”: +# http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s04.html +my $lc_messages = setlocale(LC_MESSAGES); + +# Ignore the encoding (e.g. .UTF-8) +$lc_messages =~ s/\.[^@]+//g; + +my @suffixes = ($lc_messages); + +# _COUNTRY and @MODIFIER are present +if ($lc_messages =~ /_[^@]+@/) { + my $no_modifier = $lc_messages; + $no_modifier =~ s/@.*//g; + push @suffixes, $no_modifier; + + my $no_country = $lc_messages; + $no_country =~ s/_[^@]+//g; + push @suffixes, $no_country; +} + +# Strip _COUNTRY and @MODIFIER if present +$lc_messages =~ s/[_@].*//g; +push @suffixes, $lc_messages; + +# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ +# ┃ Read all .desktop files and store the values in which we are interested. ┃ +# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ + +my %desktops; +# See http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables +my $xdg_data_home = $ENV{XDG_DATA_HOME}; +$xdg_data_home = $ENV{HOME} . '/.local/share' if + !defined($xdg_data_home) || + $xdg_data_home eq '' || + ! -d $xdg_data_home; + +my $xdg_data_dirs = $ENV{XDG_DATA_DIRS}; +$xdg_data_dirs = '/usr/local/share/:/usr/share/' if + !defined($xdg_data_dirs) || + $xdg_data_dirs eq ''; + +my @searchdirs = ("$xdg_data_home/applications/"); +for my $dir (split(':', $xdg_data_dirs)) { + push @searchdirs, "$dir/applications/"; +} + +# Cleanup the paths, maybe some application does not cope with double slashes +# (the field code %k is replaced with the .desktop file location). +@searchdirs = map { s,//,/,g; $_ } @searchdirs; + +# To avoid errors by File::Find’s find(), only pass existing directories. +@searchdirs = grep { -d $_ } @searchdirs; + +find( + { + wanted => sub { + return unless substr($_, -1 * length('.desktop')) eq '.desktop'; + my $relative = $File::Find::name; + + # + 1 for the trailing /, which is missing in ::topdir. + substr($relative, 0, length($File::Find::topdir) + 1) = ''; + + # Don’t overwrite files with the same relative path, we search in + # descending order of importance. + return if exists($desktops{$relative}); + + $desktops{$relative} = $File::Find::name; + }, + no_chdir => 1, + }, + @searchdirs +); + +my %apps; + +for my $file (values %desktops) { + my $base = basename($file); + + # _ is an invalid character for a key, so we can use it for our own keys. + $apps{$base}->{_Location} = $file; + + # Extract all “Name” and “Exec” keys from the [Desktop Entry] group + # and store them in $apps{$base}. + my %names; + my @lines = split("\n", slurp($file)); + for my $line (@lines) { + my $first = substr($line, 0, 1); + next if $line eq '' || $first eq '#'; + next unless ($line eq '[Desktop Entry]' .. + ($first eq '[' && + substr($line, -1) eq ']' && + $line ne '[Desktop Entry]')); + next if $first eq '['; + + my ($key, $value) = ($line =~ /^ + ( + [A-Za-z0-9-]+ # the spec specifies these as valid key characters + (?:\[[^]]+\])? # possibly, there as a locale suffix + ) + \s* = \s* # whitespace around = should be ignored + (.*) # no restrictions on the values + $/x); + + if ($key =~ /^Name/) { + $names{$key} = $value; + } elsif ($key eq 'Exec' || + $key eq 'TryExec') { + $apps{$base}->{$key} = $value; + } elsif ($key eq 'NoDisplay' || + $key eq 'Hidden' || + $key eq 'StartupNotify' || + $key eq 'Terminal') { + # Values of type boolean must either be string true or false, + # see “Possible value types”: + # http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s03.html + $apps{$base}->{$key} = ($value eq 'true'); + } + } + + for my $suffix (@suffixes) { + next unless exists($names{"Name[$suffix]"}); + $apps{$base}->{Name} = $names{"Name[$suffix]"}; + last; + } + + # Fallback to unlocalized “Name”. + $apps{$base}->{Name} = $names{Name} unless exists($apps{$base}->{Name}); +} + +# %apps now looks like this: +# +# %apps = { +# 'evince.desktop' => { +# 'Exec' => 'evince %U', +# 'Name' => 'Dokumentenbetrachter', +# '_Location' => '/usr/share/applications/evince.desktop' +# }, +# 'gedit.desktop' => { +# 'Exec' => 'gedit %U', +# 'Name' => 'gedit', +# '_Location' => '/usr/share/applications/gedit.desktop' +# } +# }; + +# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ +# ┃ Turn %apps inside out to provide Name → filename lookup. ┃ +# ┃ The Name is what we display in dmenu later. ┃ +# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ + +my %choices; +for my $app (keys %apps) { + my $name = $apps{$app}->{Name}; + + # Don’t offer apps which have NoDisplay == true or Hidden == true. + # See http://wiki.xfce.org/howto/customize-menu#hide_menu_entries + # for the difference between NoDisplay and Hidden. + next if (exists($apps{$app}->{NoDisplay}) && $apps{$app}->{NoDisplay}) || + (exists($apps{$app}->{Hidden}) && $apps{$app}->{Hidden}); + + if (exists($apps{$app}->{TryExec})) { + my $tryexec = $apps{$app}->{TryExec}; + if (substr($tryexec, 0, 1) eq '/') { + # Skip if absolute path is not executable. + next unless -x $tryexec; + } else { + # Search in $PATH for the executable. + my $found = 0; + for my $path (split(':', $ENV{PATH})) { + next unless -x "$path/$tryexec"; + $found = 1; + last; + } + next unless $found; + } + } + + if (exists($choices{$name})) { + # There are two .desktop files which contain the same “Name” value. + # I’m not sure if that is allowed to happen, but we disambiguate the + # situation by appending “ (2)”, “ (3)”, etc. to the name. + # + # An example of this happening is exo-file-manager.desktop and + # thunar-settings.desktop, both of which contain “Name=File Manager”. + my $inc = 2; + $inc++ while exists($choices{"$name ($inc)"}); + $name = "$name ($inc)"; + } + + $choices{$name} = $app; +} + +# %choices now looks like this: +# +# %choices = { +# 'Dokumentenbetrachter' => 'evince.desktop', +# 'gedit' => 'gedit.desktop' +# }; + +# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ +# ┃ Run dmenu to ask the user for her choice ┃ +# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ + +# open2 will just make dmenu’s STDERR go to our own STDERR. +my ($dmenu_out, $dmenu_in); +my $pid = open2($dmenu_out, $dmenu_in, $dmenu_cmd); +binmode $dmenu_in, ':utf8'; +binmode $dmenu_out, ':utf8'; + +# Feed dmenu the possible choices. +say $dmenu_in $_ for sort keys %choices; +close($dmenu_in); + +waitpid($pid, 0); +my $status = ($? >> 8); + +# Pass on dmenu’s exit status if there was an error. +exit $status unless $status == 0; + +my $choice = <$dmenu_out>; +my $app; +# Exact match: the user chose “Avidemux (GTK+)” +if (exists($choices{$choice})) { + $app = $apps{$choices{$choice}}; + $choice = ''; +} else { + # Not an exact match: the user entered “Avidemux (GTK+) ~/movie.mp4” + for my $possibility (keys %choices) { + next unless substr($choice, 0, length($possibility)) eq $possibility; + $app = $apps{$choices{$possibility}}; + substr($choice, 0, length($possibility)) = ''; + # Remove whitespace separating the entry and arguments. + $choice =~ s/^\s//g; + last; + } + if (!defined($app)) { + die "Invalid input: “$choice” does not match any application."; + } +} + +# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ +# ┃ Make i3 start the chosen application. ┃ +# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ + +my $name = $app->{Name}; +my $exec = $app->{Exec}; +my $location = $app->{_Location}; + +# Quote as described by “The Exec key”: +# http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s06.html +sub quote { + my ($str) = @_; + $str =~ s/("|`|\$|\\)/\\$1/g; + $str = qq|"$str"| if $str ne ""; + return $str; +} + +$choice = quote($choice); +$location = quote($location); + +# Remove deprecated field codes, as the spec dictates. +$exec =~ s/%[dDnNvm]//g; + +# Replace filename field codes with the rest of the command line. +# Note that we assume the user uses precisely one file name, +# not multiple file names. +$exec =~ s/%[fF]/$choice/g; + +# If the program works with URLs, +# we assume the user provided a URL instead of a filename. +# As per the spec, there must be at most one of %f, %u, %F or %U present. +$exec =~ s/%[uU]/$choice/g; + +# The translated name of the application. +$exec =~ s/%c/$name/g; + +# XXX: Icons are not implemented. Is the complexity (looking up the path if +# only a name is given) actually worth it? +#$exec =~ s/%i/--icon $icon/g; + +# location of .desktop file +$exec =~ s/%k/$location/g; + +# Literal % characters are represented as %%. +$exec =~ s/%%/%/g; + +my $nosn = ''; +my $cmd; +if (exists($app->{Terminal}) && $app->{Terminal}) { + # For applications which specify “Terminal=true” (e.g. htop.desktop), + # we need to create a temporary script that contains the full command line + # as the syntax for starting commands with arguments varies from terminal + # emulator to terminal emulator. + # Then, we launch that script with i3-sensible-terminal. + my ($fh, $filename) = tempfile(); + binmode($fh, ':utf8'); + say $fh <{StartupNotify}) && !$app->{StartupNotify}) { + $nosn = '--no-startup-id'; + } + $cmd = qq|exec $nosn "$exec"|; +} + +system('i3-msg', $cmd) == 0 or die "Could not launch i3-msg: $?"; + +=encoding utf-8 + +=head1 NAME + + i3-dmenu-desktop - run .desktop files with dmenu + +=head1 SYNOPSIS + + i3-dmenu-desktop [--dmenu='dmenu -i'] + +=head1 DESCRIPTION + +i3-dmenu-desktop is a script which extracts the (localized) name from +application .desktop files, offers the user a choice via dmenu(1) and then +starts the chosen application via i3 (for startup notification support). +The advantage of using .desktop files instead of dmenu_run(1) is that dmenu_run +offers B binaries in your $PATH, including non-interactive utilities like +"sed". Also, .desktop files contain a proper name, information about whether +the application runs in a terminal and whether it supports startup +notifications. + +The .desktop files are searched in $XDG_DATA_HOME/applications (by default +$HOME/.local/share/applications) and in the "applications" subdirectory of each +entry of $XDG_DATA_DIRS (by default /usr/local/share/:/usr/share/). + +Files with the same name in $XDG_DATA_HOME/applications take precedence over +files in $XDG_DATA_DIRS, so that you can overwrite parts of the system-wide +.desktop files by copying them to your local directory and making changes. + +i3-dmenu-desktop displays the "Name" value in the localized version depending +on LC_MESSAGES as specified in the Desktop Entry Specification. + +You can pass a filename or URL (%f/%F and %u/%U field codes in the .desktop +file respectively) by appending it to the name of the application. E.g., if you +want to launch "GNU Emacs 24" with the patch /tmp/foobar.txt, you would type +"emacs", press TAB, type " /tmp/foobar.txt" and press ENTER. + +.desktop files with Terminal=true are started using i3-sensible-terminal(1). + +.desktop files with NoDisplay=true or Hidden=true are skipped. + +UTF-8 is supported, of course, but dmenu does not support displaying all +glyphs. E.g., xfce4-terminal.desktop's Name[fi]=Pääte will be displayed just +fine, but not its Name[ru]=Терминал. + +=head1 OPTIONS + +=over + +=item B<--dmenu=command> + +Execute command instead of 'dmenu -i'. This option can be used to pass custom +parameters to dmenu, or to make i3-dmenu-desktop start a custom (patched?) +version of dmenu. + +=back + +=head1 VERSION + +Version 1.0 + +=head1 AUTHOR + +Michael Stapelberg, C<< >> + +=head1 LICENSE AND COPYRIGHT + +Copyright 2012 Michael Stapelberg. + +This program is free software; you can redistribute it and/or modify it +under the terms of the BSD license. + +=cut -- 2.39.5