6 # Copyright (C) 2010 Red Hat Inc.
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 2 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 use Cwd qw(getcwd abs_path);
30 use Glib qw(TRUE FALSE);
38 techtalk-pse - superior technical demonstration software
42 cd /path/to/talk/; techtalk-pse
44 techtalk-pse /path/to/talk/
48 Tech Talk "Platinum Supreme Edition" (PSE) is Linux Presentation
49 Software designed by technical people to give technical software
50 demonstrations to other technical people. It is designed to be simple
51 to use (for people who know how to use an editor and the command line)
52 and powerful, so that you can create informative, technically accurate
53 and entertaining talks and demonstrations.
55 Tech Talk PSE is good at opening editors at the right place, opening
56 shell prompts with preloaded history, compiling and running things
57 during the demonstration, displaying text, photos, figures and video.
59 Tech Talk PSE is I<bad> at slide effects, chart junk and bullet
62 This manual page covers all the documentation you will need to use
63 Tech Talk PSE. The next section covers running the tool from the
64 command line. After that there is a L</TUTORIAL> section to get you
65 started. Then there is a detailed L</REFERENCE> section. Finally
66 there is a discussion on L<WHAT MAKES A GOOD TALK>.
68 =head1 RUNNING THE TOOL FROM THE COMMAND LINE
70 A Tech Talk PSE talk is not a single file, but a directory full of
71 files. (If you want to start a new talk, see the L</TUTORIAL> section
72 below). To display or run the talk, change into the directory
73 containing all those files and run the C<techtalk-pse> command:
75 cd /path/to/talk/; techtalk-pse
77 You can also run C<techtalk-pse> without changing directory, instead
78 specifying the path to the talk:
80 techtalk-pse /path/to/talk/
92 Display brief help and exit.
100 Start at the last slide.
102 You cannot use this with the B<-n> / B<--start> option.
108 =item B<-n SLIDE> | B<--start SLIDE>
110 Start at the named slide. I<SLIDE> is the shortest unique prefix of
111 the slide name, so to start at a slide named
112 I<00010-introduction.html>, you could use I<-n 00010> or I<-n 00010-intro>,
113 or give the full filename I<-n 00010-introduction.html>.
115 The default is to start at the first slide in the talk.
123 Don't display the initial "splash" screen which advertises Tech Talk
124 PSE to your audience. Just go straight into the talk.
132 Display verbose messages, useful for debugging or tracing
133 what the program is doing.
141 Display version number and exit.
149 GetOptions ("help|?" => \$help,
151 "mozembed" => \$mozembed,
152 "mozembed-first" => \$mozembed_first,
153 "mozembed-last" => \$mozembed_last,
155 "splash!" => \$splash,
156 "start=s" => \$start,
157 "verbose" => \$verbose,
158 "version" => \$version,
165 pod2usage (1) if $help;
167 print "@PACKAGE@ @VERSION@\n";
170 die "techtalk-pse: cannot use --start and --last options together\n"
171 if defined $last && defined $start;
173 # Run with --mozembed: see below.
174 run_mozembed () if $mozembed;
176 # Normal run of the program.
177 die "techtalk-pse: too many arguments\n" if @ARGV >= 2;
179 # Get the true name of the program.
186 chdir $d or die "techtalk-pse: chdir: $d: $!";
188 # XXX In future allow people to specify an archive and unpack
190 die "techtalk-pse: argument is not a directory"
202 foreach (glob ("*")) {
203 if (/^(\d+)(?:-.*)\.(html|sh)$/) {
204 print STDERR "reading $_\n" if $verbose;
208 warn "techtalk-pse: $_: command file is not executable (+x)\n"
209 if $ext eq "sh" && ! -x $_;
211 my $h = { name => $_, seq => $1, ext => $2, i => $i };
216 print STDERR "ignoring $_\n" if $verbose;
221 $files[0]->{first} = 1;
222 $files[$#files]->{last} = 1;
226 print STDERR "read ", 0+@files, " files\n" if $verbose;
228 warn "techtalk-pse: no files found, continuing anyway ...\n"
231 # Work out what slide we're starting on.
233 if (defined $current) {
234 die "start slide not implemented yet XXX"
237 $current = $files[0];
239 # else $current is undefined
242 my $w = Gtk2::AboutDialog->new;
243 $w->set_authors ("Richard W.M. Jones");
245 "Superior technical demonstration software\n".
248 "↑ — Go back one slide\n".
249 "↓ — Go forward one slide\n"
251 $w->set_program_name ("Tech Talk Platinum Supreme Edition (PSE)");
252 $w->set_version ("@VERSION@");
253 $w->set_website ("http://people.redhat.com/~rjones");
254 $w->set_license ("GNU General Public License v2 or above");
256 print STDERR "calling \$w->destroy on about dialog\n" if $verbose;
261 if (defined $current) {
262 my $go = show_slide ($current);
264 print STDERR "go = $go\n" if $verbose;
265 last MAIN if $go eq "QUIT";
267 my $i = $current->{i};
268 print STDERR "i = $i\n" if $verbose;
269 $i-- if $go eq "PREV" && $i > 0;
270 $i++ if $go eq "NEXT" && $i+1 < @files;
271 $current = $files[$i];
274 print "No slides found. Press any key to reload directory ...\n";
278 # Reread directory between slides.
281 if (defined $current && !exists $files{$current->{name}}) {
282 # Current slide was deleted.
284 $current = $files[0] if @files;
292 # Display an HTML page.
293 if ($slide->{ext} eq "html") {
294 # MozEmbed is incredibly crashy, so we run ourself as a
295 # subprocess, so when it segfaults we don't care.
296 my @cmd = ($0, "--mozembed");
297 push @cmd, "--mozembed-first" if exists $slide->{first};
298 push @cmd, "--mozembed-last" if exists $slide->{last};
300 my $url = "file://" . $cwd . "/" . $slide->{name};
303 die "failed to execute subcommand: ", join(" ", @cmd), ": $!\n"
306 # Subcommand probably segfaulted, just continue to next slide.
319 # Run a shell command.
320 elsif ($slide->{ext} eq "sh") {
322 # http://docstore.mik.ua/orelly/perl/cookbook/ch10_17.htm
323 local *run_process = sub {
325 die "fork: $!" unless defined $pid;
329 exec ("./".$slide->{name});
330 die "failed to execute command: ", $slide->{name}, ": $!";
334 local *kill_process = sub {
335 print STDERR "sending TERM signal to process group $pid\n"
343 my $w = Gtk2::Window->new ();
345 my $s = $w->get_screen;
346 $w->set_default_size ($s->get_width, -1);
348 $w->set_decorated (0);
350 my $bbox = Gtk2::HButtonBox->new ();
351 $bbox->set_layout ('start');
353 my $bnext = Gtk2::Button->new ("Next slide");
354 $bnext->signal_connect (clicked => sub { $r = "NEXT"; $w->destroy });
355 $bnext->set_sensitive (!(exists $slide->{last}));
358 my $bback = Gtk2::Button->new ("Back");
359 $bback->signal_connect (clicked => sub { $r = "PREV"; $w->destroy });
360 $bback->set_sensitive (!(exists $slide->{first}));
363 my $brestart = Gtk2::Button->new ("Kill & restart");
364 $brestart->signal_connect (clicked => sub {
368 $bbox->add ($brestart);
370 my $bquit = Gtk2::Button->new ("Quit");
371 $bquit->signal_connect (clicked => sub { $r = "QUIT"; $w->destroy });
373 $bbox->set_child_secondary ($bquit, 1);
377 $w->signal_connect (destroy => sub {
386 print STDERR "returning r=$r\n" if $verbose;
391 # If invoked with the --mozembed parameter then we just display a
392 # single page. This is just to prevent crashes in MozEmbed from
393 # killing the whole program.
398 my $w = Gtk2::Window->new ();
399 my $vbox = Gtk2::VBox->new ();
400 my $moz = Gtk2::MozEmbed->new ();
402 my $bbox = Gtk2::HButtonBox->new ();
403 $bbox->set_layout ('start');
405 $vbox->pack_start ($bbox, 0, 0, 0);
408 #$w->set_default_size (640, 480);
411 my $bnext = Gtk2::Button->new ("Next slide");
412 $bnext->signal_connect (clicked => sub { $r = 0; $w->destroy });
413 $bnext->set_sensitive (!$mozembed_last);
416 my $bback = Gtk2::Button->new ("Back");
417 $bback->signal_connect (clicked => sub { $r = 1; $w->destroy });
418 $bback->set_sensitive (!$mozembed_first);
421 my $bquit = Gtk2::Button->new ("Quit");
422 $bquit->signal_connect (clicked => sub { $r = 2; $w->destroy });
424 $bbox->set_child_secondary ($bquit, 1);
426 $w->signal_connect (destroy => sub {
432 $moz->load_url ($ARGV[0]);
442 =head2 START WRITING A TALK
444 [Before you start writing your real talk, I urge you to read
445 L</WHAT MAKES A GOOD TALK> below].
447 To start your talk, all you have to do is to make a new directory
453 A tech talk consists of HTML files ("slides") and shell scripts. The
454 filenames must start with a number, followed optionally by a
455 description, followed by the extension (C<.html> or C<.sh>). So to
456 start our talk with two slides:
458 echo "This is the introduction" > 0010-introduction.html
459 echo "This is the second slide" > 0020-second.html
461 To run it, run the command from within the talk directory:
465 Any other file in the directory is ignored, so if you want to add
466 Makefiles, version control files etc, just go ahead.
468 =head2 TIPS FOR WRITING HTML
470 You may have your own techniques and tools for writing HTML, so
471 this section is just to share my ideas. I start every
472 HTML file with a standard stylesheet and Javascript header:
474 <link rel="stylesheet" href="style.css" type="text/css"/>
475 <script src="code.js" type="text/javascript"></script>
477 That just ensures that I can put common styling instructions for all
478 my slides in a single file (C<style.css>), and I have one place where
479 I can add all Javascript, if I need to use any (C<code.js>).
481 To add a common background and font size to all slides, put this in
486 background: url(background-image.jpg) no-repeat;
489 Scaling slide text and images so that they appear at the same
490 proportionate size for any screen resolution can be done using
492 L<https://developer.mozilla.org/En/DOM/window.innerHeight>).
494 =head2 CREATING FIGURES
496 Use your favorite tool to draw the figure, convert it to an image (in
497 any format that the Mozilla engine can display) and include it using
498 an C<E<lt>imgE<gt>> tag, eg:
502 Suitable tools include: XFig, GnuPlot, GraphViz, and many TeX tools
503 such as PicTex and in particular TikZ.
505 =head2 EMBEDDING VIDEOS, ANIMATIONS, ETC.
507 Using HTML 5, embedding videos in the browser is easy. See:
508 L<https://developer.mozilla.org/En/Using_audio_and_video_in_Firefox>
510 For animations, you could try L<Haxe|http://haxe.org/> which has a
511 Javascript back-end. There are many other possibilities.
513 If you are B<sure> that the venue will have an internet connection,
514 why not embed a YouTube video.
516 =head2 DISPLAYING EXISTING WEB PAGES
518 Obviously you could just have an HTML file that contains a redirect to
521 <meta http-equiv="Refresh" content="0; url=http://www.example.com/">
523 However if you want your talk to work offline, then it's better to
524 download the web page in advance, eg. using Firefox's "Save Page As
525 -E<gt> Web Page, complete" feature, into the talk directory, then
526 either rename or make a symbolic link to the slide name:
528 ln -s "haXe - Welcome to haXe.html" 0010-haxe-homepage.html
530 =head2 TIPS FOR WRITING SHELL SCRIPTS
532 Make sure each C<*.sh> file you write is executable, otherwise Tech
533 Talk PSE won't be able to run it. (The program gives a warning if you
536 A good idea is to start each script by sourcing some common functions.
537 All my scripts start with:
542 where C<functions> is another file (ignored by Tech Talk PSE) which
543 contains common functions for setting shell history and starting a
546 In C<functions>, I have:
548 # -*- shell-script -*-
550 export HISTFILE=/tmp/history
555 echo "$@" >> $HISTFILE
563 --geometry=+100+100 \
566 -e '/bin/bash --norc' \
570 By initializing the shell history, during your talk you can rapidly
571 recall commands to start parts of the demonstration just by hitting
572 the Up arrow. A complete shell script from one of my talks would look
577 add_history guestfish -i debian.img
578 terminal --title="Examining a Debian guest image in guestfish"
580 This is just a starting point for your own scripts. You may want to
581 use a different terminal, such as xterm, and you may want to adjust
586 =head2 ORDER OF FILES
588 Tech Talk PSE displays the slides in the directory in lexicographic
589 order (the same order as C<LANG=C ls -1>). Only files matching the
590 following regexp are considered:
592 ^(\d+)(?:-.*)\.(html|sh)$
594 For future compatibility, you should ensure that every slide has a
595 unique numeric part (ie. I<don't> have C<0010-aaa.html> and
596 C<0010-bbb.html>). This is because in future we want to have the
597 ability to display multiple files side by side.
599 Also for future compatibility, I<don't> use file names that have an
600 uppercase letter immediately after the numeric part. This is because
601 in future we want to allow placement hints using filenames like
602 C<0010L-on-the-left.html> and C<0010R-on-the-right.html>.
604 =head2 BASE URL AND CURRENT DIRECTORY
606 The base URL is set to the be the directory containing the talk files.
607 Thus you should use relative paths, eg:
611 You can also place assets into subdirectories, because subdirectories
612 are ignored by Tech Talk PSE, eg:
614 <img src="images/fig1.gif">
616 When running shell scripts, the current directory is also set to be
617 the directory containing the talk files, so the same rules about using
618 relative paths apply there too.
620 =head1 WHAT MAKES A GOOD TALK
622 I like what Edward Tufte writes, for example his evisceration of
623 PowerPoint use at NASA here:
624 L<http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001yB>
626 However it is sometimes hard to translate his ideas into clear
627 presentations, and not all of that is the fault of the tools. Here
628 are my thoughts and rules on how to deliver a good talk.
630 B<First, most important rule:> Before you start drawing any slides at
631 all, write your talk as a short essay.
633 This is the number one mistake that presenters make, and it is partly
634 a tool fault, because PowerPoint, OpenOffice, even Tech Talk PSE, all
635 open up on an initial blank slide, inviting you to write a title and
636 some bullet points. If you start that way, you will end up using the
637 program as a kind of clumsy outlining tool, and then reading that
638 outline to your audience. That's boring and a waste of time for you
639 and your audience. (It would be quicker for them just to download the
640 talk and read it at home).
642 B<Secondly:> How long do you want to spend preparing the talk? A good
643 talk, with a sound essay behind it, well thought out diagrams and
644 figures, and interesting demonstrations, takes many hours to prepare.
645 How many hours? I would suggest thinking about how many hours of
646 effort your audience are putting in. Even just 20 people sitting
647 there for half an hour is 10 man-hours of attention, and that is a
648 very small talk, and doesn't include all the extra time and hassle
649 that it took to get them all in one place.
651 I don't think you can get away with spending less than two full days
652 preparing a talk, if you want to master the topic and draw up accurate
653 slides. Steve Jobs is reputed to spend weeks preparing his annual
654 sales talk to the Apple faithful.
656 B<Thirdly:> Now that you're going to write your talk as an essay, what
657 should go in the slides? I would say that you should consider
658 delivering the essay, I<not> the slides, to people who don't make the
659 talk. An essay can be turned into an article or blog posting, whereas
660 even "read-out-the-bullet-point" slides have a low information
661 density, large size, and end-user compatibility problems (*.pptx
664 What, then, goes on the slides? Anything you cannot just say:
665 diagrams, graphs, videos, animations, and of course (only with Tech
666 Talk PSE!) demonstrations.
668 B<Lastly:> Once you've got your talk as an essay and slides, practice,
669 practice and practice again. Deliver the talk to yourself in the
670 mirror, to your colleagues. Practice going backwards and forwards
671 through the slides, using your actual laptop and the software so you
672 know what to click and what keys to press. Partly memorize what you
673 are going to say (but use short notes written on paper if you need
678 The Cognitive Style of PowerPoint, Tufte, Edward R.
682 Richard W.M. Jones L<http://people.redhat.com/~rjones/>
686 Copyright (C) 2010 Red Hat Inc.
688 This program is free software; you can redistribute it and/or modify
689 it under the terms of the GNU General Public License as published by
690 the Free Software Foundation; either version 2 of the License, or
691 (at your option) any later version.
693 This program is distributed in the hope that it will be useful,
694 but WITHOUT ANY WARRANTY; without even the implied warranty of
695 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
696 GNU General Public License for more details.
698 You should have received a copy of the GNU General Public License
699 along with this program; if not, write to the Free Software
700 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.