From 7280b38541964c18b67ab548219c902fdeee5885 Mon Sep 17 00:00:00 2001
From: Sacha Chua <sacha@sachachua.com>
Date: Sat, 3 Dec 2022 13:57:05 -0500
Subject: Add captions

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+WEBVTT captioned by sachac
+
+1
+00:00:00.000 --> 00:00:06.280
+Hi everyone! I'm Mats Liddell.
+
+2
+00:00:06.280 --> 00:00:07.320
+In this talk, I will show
+
+3
+00:00:07.320 --> 00:00:09.040
+how you can link to personal data
+
+4
+00:00:09.040 --> 00:00:13.960
+using Hyperbole's support for implicit button types.
+
+5
+00:00:13.960 --> 00:00:16.040
+Before starting, a few words about me.
+
+6
+00:00:16.040 --> 00:00:18.000
+I work as a software engineer,
+
+7
+00:00:18.000 --> 00:00:19.200
+and in my spare time
+
+8
+00:00:19.200 --> 00:00:21.280
+I'm co-maintaining the Hyperbole package
+
+9
+00:00:21.280 --> 00:00:24.360
+together with the package author Bob Weiner.
+
+10
+00:00:24.360 --> 00:00:27.240
+Hyperbole dates back to 1993,
+
+11
+00:00:27.240 --> 00:00:29.680
+and have had some inactive years in the past,
+
+12
+00:00:29.680 --> 00:00:31.680
+but work is now active again.
+
+13
+00:00:31.680 --> 00:00:33.080
+The package is available
+
+14
+00:00:33.080 --> 00:00:36.160
+through the GNU ELPA package archive.
+
+15
+00:00:36.160 --> 00:00:37.960
+The talk will focus on
+
+16
+00:00:37.960 --> 00:00:39.600
+creation of implicit button types.
+
+17
+00:00:39.600 --> 00:00:41.480
+For more info on Hyperbole,
+
+18
+00:00:41.480 --> 00:00:43.120
+listen to other presentations
+
+19
+00:00:43.120 --> 00:00:46.360
+and check out the package documentation.
+
+20
+00:00:46.360 --> 00:00:50.000
+What I want you to take with you from this talk is
+
+21
+00:00:50.000 --> 00:00:51.640
+that the implicit button types
+
+22
+00:00:51.640 --> 00:00:54.440
+can make patterns in your files into buttons;
+
+23
+00:00:54.440 --> 00:00:56.600
+and that new implicit button types
+
+24
+00:00:56.600 --> 00:00:58.480
+can quickly be created by using
+
+25
+00:00:58.480 --> 00:01:01.760
+the `defil' and the `defal' macros.
+
+26
+00:01:01.760 --> 00:01:05.160
+So what is an implicit button type?
+
+27
+00:01:05.160 --> 00:01:06.800
+I think of it as a text pattern
+
+28
+00:01:06.800 --> 00:01:08.920
+that has some extended meaning.
+
+29
+00:01:08.920 --> 00:01:10.760
+When you see the pattern in the text,
+
+30
+00:01:10.760 --> 00:01:12.800
+you can think of it as a button type.
+
+31
+00:01:12.800 --> 00:01:13.880
+When you press the button,
+
+32
+00:01:13.880 --> 00:01:16.880
+something related to that meaning happens.
+
+33
+00:01:16.880 --> 00:01:19.000
+It can be jumping to some place,
+
+34
+00:01:19.000 --> 00:01:22.440
+opening an external tool, doing some computation.
+
+35
+00:01:22.440 --> 00:01:24.160
+So there can be some action
+
+36
+00:01:24.160 --> 00:01:29.920
+associated with the pattern.
+
+37
+00:01:29.920 --> 00:01:33.320
+To make it clear, let's look at some examples.
+
+38
+00:01:33.320 --> 00:01:36.080
+Let's start with something that is maybe so obvious
+
+39
+00:01:36.080 --> 00:01:39.600
+that you don't even think of it as a pattern: a file name.
+
+40
+00:01:39.600 --> 00:01:41.360
+When you see such a string in text,
+
+41
+00:01:41.360 --> 00:01:45.360
+you will naturally associate it with a file on disk,
+
+42
+00:01:45.360 --> 00:01:46.720
+and if you would click on it,
+
+43
+00:01:46.720 --> 00:01:52.680
+you would probably expect that file to open.
+
+44
+00:01:52.680 --> 00:01:55.120
+In the first sentence on the slide,
+
+45
+00:01:55.120 --> 00:01:56.840
+you might recognize the file name
+
+46
+00:01:56.840 --> 00:02:01.760
+for the bash initialization file, ~/.bashrc.
+
+47
+00:02:01.760 --> 00:02:03.840
+Hyperbole comes with built-in support
+
+48
+00:02:03.840 --> 00:02:06.520
+for recognizing files and directory path names
+
+49
+00:02:06.520 --> 00:02:08.680
+as implicit button types in text.
+
+50
+00:02:08.680 --> 00:02:11.760
+For Hyperbole to take action on the button type,
+
+51
+00:02:11.760 --> 00:02:13.440
+you move the cursor within the button
+
+52
+00:02:13.440 --> 00:02:16.320
+and press M-RET or use a mouse click.
+
+53
+00:02:16.320 --> 00:02:22.360
+So let's try that.
+
+54
+00:02:22.360 --> 00:02:27.720
+Similar for the path, /usr/local in the next sentence.
+
+55
+00:02:27.720 --> 00:02:29.520
+That will open the corresponding
+
+56
+00:02:29.520 --> 00:02:37.080
+directory using dired-mode.
+
+57
+00:02:37.080 --> 00:02:39.760
+Other examples of built-in implicit button types
+
+58
+00:02:39.760 --> 00:02:43.720
+that Hyperbole recognizes are email addresses,
+
+59
+00:02:43.720 --> 00:02:47.320
+web addresses, requests for comment documents
+
+60
+00:02:47.320 --> 00:02:50.120
+in the form of RFC followed by a number,
+
+61
+00:02:50.120 --> 00:02:53.040
+GNU debbugs issues, plus many more.
+
+62
+00:02:53.040 --> 00:02:55.360
+These are some examples
+
+63
+00:02:55.360 --> 00:02:58.080
+of implicit button types with built-in support.
+
+64
+00:02:58.080 --> 00:02:59.920
+I list them here to give you an idea
+
+65
+00:02:59.920 --> 00:03:02.480
+how the text pattern in itself is enough
+
+66
+00:03:02.480 --> 00:03:03.960
+for the system to recognize it
+
+67
+00:03:03.960 --> 00:03:10.120
+as something actionable.
+
+68
+00:03:10.120 --> 00:03:12.480
+So as shown, Hyperbole has built-in support
+
+69
+00:03:12.480 --> 00:03:14.040
+for implicit buttons.
+
+70
+00:03:14.040 --> 00:03:16.120
+There's only one problem here.
+
+71
+00:03:16.120 --> 00:03:17.920
+The behavior is predefined.
+
+72
+00:03:17.920 --> 00:03:20.240
+There is of course a trade off.
+
+73
+00:03:20.240 --> 00:03:21.560
+It is convenient to get
+
+74
+00:03:21.560 --> 00:03:23.480
+many button types out of the box
+
+75
+00:03:23.480 --> 00:03:25.520
+with likely good standard behavior
+
+76
+00:03:25.520 --> 00:03:27.680
+and that works in many places.
+
+77
+00:03:27.680 --> 00:03:29.360
+But what if you would want to create
+
+78
+00:03:29.360 --> 00:03:31.160
+your own completely new mapping,
+
+79
+00:03:31.160 --> 00:03:32.880
+possibly to your own data?
+
+80
+00:03:32.880 --> 00:03:38.120
+It is here that Hyperbole's support for creating
+
+81
+00:03:38.120 --> 00:03:41.280
+new implicit button types comes in.
+
+82
+00:03:41.280 --> 00:03:43.360
+For the full pattern matching button type,
+
+83
+00:03:43.360 --> 00:03:46.720
+like for the filename and examples we just looked at,
+
+84
+00:03:46.720 --> 00:03:48.754
+you need to define the implicit button
+
+00:03:48.755 --> 00:03:50.920
+using the macro, `defib'.
+
+85
+00:03:50.920 --> 00:03:53.280
+The downside of that is
+
+86
+00:03:53.280 --> 00:03:54.920
+you need to code at the elisp level.
+
+87
+00:03:54.920 --> 00:03:57.240
+However, if you are creating a new pattern
+
+88
+00:03:57.240 --> 00:03:59.120
+that has well-defined delimiters,
+
+89
+00:03:59.120 --> 00:04:01.360
+there is support for that in an easier way.
+
+90
+00:04:01.360 --> 00:04:03.800
+These support functions, or rather macros,
+
+91
+00:04:03.800 --> 00:04:06.240
+are `defil' and `defal'.
+
+92
+00:04:06.240 --> 00:04:08.440
+We will look at those macros soon,
+
+93
+00:04:08.440 --> 00:04:13.400
+but first, my definition of personal data.
+
+94
+00:04:13.400 --> 00:04:18.200
+I think of personal data as something
+
+95
+00:04:18.200 --> 00:04:19.680
+that you would like to link to,
+
+96
+00:04:19.680 --> 00:04:21.440
+but it's not necessarily in a form
+
+97
+00:04:21.440 --> 00:04:23.360
+supported by any known tool.
+
+98
+00:04:23.360 --> 00:04:26.920
+It might be stored on a web server, local storage,
+
+99
+00:04:26.920 --> 00:04:28.680
+or could even be some computation
+
+100
+00:04:28.680 --> 00:04:29.400
+rather than a link.
+
+101
+00:04:29.400 --> 00:04:32.200
+What all these cases have in common is that
+
+102
+00:04:32.200 --> 00:04:34.240
+you want to be able to reference it
+
+103
+00:04:34.240 --> 00:04:36.640
+in a short, and for you, descriptive way.
+
+104
+00:04:36.640 --> 00:04:38.960
+So when you write text, you can use
+
+105
+00:04:38.960 --> 00:04:44.480
+a new implicit type to create the connection.
+
+106
+00:04:44.480 --> 00:04:46.600
+This might be a bit abstract,
+
+107
+00:04:46.600 --> 00:04:48.080
+so let's look at an example.
+
+108
+00:04:48.080 --> 00:04:51.000
+Suppose you have a flat file structure
+
+109
+00:04:51.000 --> 00:04:52.760
+with some notes in each file.
+
+110
+00:04:52.760 --> 00:04:54.520
+It can look like this.
+
+111
+00:04:54.520 --> 00:04:57.400
+In the data folder, we have two files
+
+112
+00:04:57.400 --> 00:05:00.200
+that represents the notes we have taken.
+
+113
+00:05:00.200 --> 00:05:02.840
+We now want to be able to link to these notes
+
+114
+00:05:02.840 --> 00:05:07.120
+from outside of the data folder.
+
+115
+00:05:07.120 --> 00:05:08.960
+Let's make an implicit button type
+
+116
+00:05:08.960 --> 00:05:10.920
+that opens a file in this structure.
+
+117
+00:05:10.920 --> 00:05:13.520
+To make the pattern stand out in text,
+
+118
+00:05:13.520 --> 00:05:16.640
+we use double braces as start and stop delimiters.
+
+119
+00:05:16.640 --> 00:05:20.080
+An implicit button instance
+
+120
+00:05:20.080 --> 00:05:22.760
+would then look like this.
+
+121
+00:05:22.760 --> 00:05:27.680
+We can create that using the `defil' macro like this.
+
+122
+00:05:27.680 --> 00:05:31.840
+This invocation of the field
+
+123
+00:05:31.840 --> 00:05:34.480
+creates a button type "demo-link-to-file"
+
+124
+00:05:34.480 --> 00:05:37.280
+with the start delimiter of "{{"
+
+125
+00:05:37.280 --> 00:05:40.560
+and then delimiters of "}}",
+
+126
+00:05:40.560 --> 00:05:43.320
+the regular expression ".*" pattern
+
+127
+00:05:43.320 --> 00:05:45.640
+to match everything between the delimiters,
+
+128
+00:05:45.640 --> 00:05:48.800
+and finally, the action defined by the link expression.
+
+129
+00:05:48.800 --> 00:05:52.160
+Pattern substitution is performed
+
+130
+00:05:52.160 --> 00:05:54.440
+on the link expression before evaluation
+
+131
+00:05:54.440 --> 00:05:57.920
+so that the text that is in between the delimiters
+
+132
+00:05:57.920 --> 00:06:02.360
+is inserted where the "\\&" is in the link expression.
+
+134
+00:06:02.360 --> 00:06:07.560
+So all in all, implicit type instance will result in
+
+135
+00:06:07.560 --> 00:06:11.760
+the link expression of "~/data/FileA",
+
+136
+00:06:11.760 --> 00:06:14.520
+which we recognize as a file path.
+
+137
+00:06:14.520 --> 00:06:18.040
+With a single-line expression,
+
+138
+00:06:18.040 --> 00:06:21.040
+we have created our own hyperbutton syntax
+
+139
+00:06:21.040 --> 00:06:23.080
+that we can use in any Emacs buffer
+
+140
+00:06:23.080 --> 00:06:25.560
+to link to this custom set of data.
+
+141
+00:06:25.560 --> 00:06:30.960
+So let's evaluate the defil and use it.
+
+142
+00:06:30.960 --> 00:06:33.760
+I have prepared the files so that they already
+
+143
+00:06:33.760 --> 00:06:36.400
+contain some text and implicit links.
+
+144
+00:06:36.400 --> 00:06:43.760
+So from the presentation, we can go to FileA,
+
+145
+00:06:43.760 --> 00:06:48.720
+and from there to fileB.
+
+146
+00:06:48.720 --> 00:06:51.040
+Since the Hyperbole path expression
+
+147
+00:06:51.040 --> 00:06:53.640
+supports outline structures, we can,
+
+148
+00:06:53.640 --> 00:06:55.960
+as an extra bonus, reference directly
+
+149
+00:06:55.960 --> 00:06:57.560
+the headers in the files,
+
+150
+00:06:57.560 --> 00:07:00.160
+so we can, for example, link directly
+
+151
+00:07:00.160 --> 00:07:02.600
+to "More Notes" in FileB.
+
+152
+00:07:02.600 --> 00:07:10.720
+We have now created a simple info system.
+
+154
+00:07:10.720 --> 00:07:16.440
+Looking deeper at the link expression,
+
+155
+00:07:16.440 --> 00:07:19.840
+it can be of four different types:
+
+156
+00:07:19.840 --> 00:07:22.040
+A file path expression,
+
+157
+00:07:22.040 --> 00:07:23.520
+as we have already looked at;
+
+158
+00:07:23.520 --> 00:07:25.960
+a brace-delimited key series,
+
+159
+00:07:25.960 --> 00:07:27.960
+that is, a series of command keys
+
+160
+00:07:27.960 --> 00:07:29.480
+for performing some action,
+
+161
+00:07:29.480 --> 00:07:30.960
+much like a keyboard macro;
+
+162
+00:07:30.960 --> 00:07:36.240
+An URL; or a function that takes one argument,
+
+163
+00:07:36.240 --> 00:07:38.640
+which will be given the button text as input.
+
+164
+00:07:38.640 --> 00:07:42.880
+The URL link expression allows you
+
+165
+00:07:42.880 --> 00:07:44.480
+to link to web pages.
+
+166
+00:07:44.480 --> 00:07:46.560
+So if the data you want to link to
+
+167
+00:07:46.560 --> 00:07:48.640
+is accessible through the Web
+
+168
+00:07:48.640 --> 00:07:50.880
+and the URL can be constructed
+
+169
+00:07:50.880 --> 00:07:53.000
+from the button text in a meaningful way,
+
+170
+00:07:53.000 --> 00:07:54.520
+it is possible to do that.
+
+171
+00:07:54.520 --> 00:07:56.160
+Let's create the button type
+
+172
+00:07:56.160 --> 00:07:57.720
+that links to GNU software.
+
+173
+00:07:57.720 --> 00:08:01.088
+The URL to the GNU software catalog
+
+00:08:01.089 --> 00:08:04.680
+is www.gnu.org/software,
+
+174
+00:08:04.680 --> 00:08:07.440
+and with what we know about the field,
+
+175
+00:08:07.440 --> 00:08:09.640
+it is easy to create the button type for that.
+
+176
+00:08:09.640 --> 00:08:11.000
+It can look like this.
+
+177
+00:08:11.000 --> 00:08:16.200
+And here are two possible buttons
+
+178
+00:08:16.200 --> 00:08:19.320
+linking to Emacs and Hyperbole.
+
+179
+00:08:19.320 --> 00:08:24.200
+So let's again evaluate the defil and use it.
+
+180
+00:08:24.200 --> 00:08:28.120
+Please note that not all GNU software
+
+181
+00:08:28.120 --> 00:08:29.000
+is under that URL,
+
+182
+00:08:29.000 --> 00:08:31.000
+so this simple definition will not work
+
+183
+00:08:31.000 --> 00:08:32.200
+to link to everything.
+
+184
+00:08:32.200 --> 00:08:37.280
+To highlight the fact that the button action
+
+185
+00:08:37.280 --> 00:08:39.080
+does not have to be a link,
+
+186
+00:08:39.080 --> 00:08:40.600
+but can be any action,
+
+187
+00:08:40.600 --> 00:08:42.200
+let's look at a math example.
+
+188
+00:08:42.200 --> 00:08:44.800
+Here is the button type that does some math
+
+189
+00:08:44.800 --> 00:08:47.480
+and writes the result in the message area.
+
+190
+00:08:47.480 --> 00:08:57.160
+Let's evaluate and use it.
+
+191
+00:08:57.160 --> 00:08:59.760
+Before ending, I would like to mention
+
+192
+00:08:59.760 --> 00:09:00.760
+the defal macro.
+
+193
+00:09:00.760 --> 00:09:02.920
+It is similar to the defil macro,
+
+194
+00:09:02.920 --> 00:09:04.880
+but simpler, since it uses a form
+
+195
+00:09:04.880 --> 00:09:07.880
+of the implicit button type with no delimiters.
+
+196
+00:09:07.880 --> 00:09:14.800
+It is simply <TYPE LINK-EXPR>.
+
+197
+00:09:14.800 --> 00:09:17.920
+So the implicit button type contains the link type
+
+198
+00:09:17.920 --> 00:09:18.960
+in clear text.
+
+199
+00:09:18.960 --> 00:09:23.120
+Our recent FSF software button
+
+200
+00:09:23.120 --> 00:09:24.854
+would be created like this.
+
+00:09:24.855 --> 00:09:29.760
+And it would be instantiated in text like this.
+
+202
+00:09:29.760 --> 00:09:34.960
+I have shown how you,
+
+203
+00:09:34.960 --> 00:09:37.840
+with the help of the defil macro in Hyperbole,
+
+204
+00:09:37.840 --> 00:09:40.240
+quickly can create implicit buttons.
+
+205
+00:09:40.240 --> 00:09:41.480
+With those buttons, you can link
+
+206
+00:09:41.480 --> 00:09:43.160
+to your personal information
+
+207
+00:09:43.160 --> 00:09:44.160
+in the form it may have.
+
+208
+00:09:44.160 --> 00:09:47.200
+By the nature of the implicit buttons,
+
+209
+00:09:47.200 --> 00:09:49.880
+those can be used from any file in Emacs.
+
+210
+00:09:49.880 --> 00:09:52.640
+The button types can be
+
+211
+00:09:52.640 --> 00:09:54.640
+created to be used long term,
+
+212
+00:09:54.640 --> 00:09:57.680
+but even short term use within the session is possible,
+
+213
+00:09:57.680 --> 00:09:59.880
+since the creation is simple and quick.
+
+214
+00:09:59.880 --> 00:10:03.400
+Inspired by this, I hope you will find ways
+
+215
+00:10:03.400 --> 00:10:04.760
+to create implicit buttons
+
+216
+00:10:04.760 --> 00:10:07.360
+that will support you getting to your information.
+
+217
+00:10:07.360 --> 00:10:09.240
+For the simplest cases,
+
+218
+00:10:09.240 --> 00:10:11.400
+the field and the file macros might be enough.
+
+219
+00:10:11.400 --> 00:10:13.360
+For more complicated cases,
+
+220
+00:10:13.360 --> 00:10:15.760
+using a tailor-made function can be an option.
+
+221
+00:10:15.760 --> 00:10:19.480
+If you know Elisp, use the defib macro
+
+222
+00:10:19.480 --> 00:10:22.240
+which gives you full control over the button type.
+
+223
+00:10:22.240 --> 00:10:32.000
+Thank you.
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