263 lines
7.6 KiB
Go
263 lines
7.6 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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The present file format
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Present files have the following format. The first non-blank non-comment
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line is the title, so the header looks like
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Title of document
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Subtitle of document
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15:04 2 Jan 2006
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Tags: foo, bar, baz
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<blank line>
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Author Name
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Job title, Company
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joe@example.com
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http://url/
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@twitter_name
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The subtitle, date, and tags lines are optional.
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The date line may be written without a time:
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2 Jan 2006
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In this case, the time will be interpreted as 10am UTC on that date.
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The tags line is a comma-separated list of tags that may be used to categorize
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the document.
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The author section may contain a mixture of text, twitter names, and links.
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For slide presentations, only the plain text lines will be displayed on the
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first slide.
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Multiple presenters may be specified, separated by a blank line.
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After that come slides/sections, each after a blank line:
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* Title of slide or section (must have asterisk)
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Some Text
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** Subsection
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- bullets
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- more bullets
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- a bullet with
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*** Sub-subsection
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Some More text
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Preformatted text
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is indented (however you like)
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Further Text, including invocations like:
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.code x.go /^func main/,/^}/
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.play y.go
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.image image.jpg
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.background image.jpg
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.iframe http://foo
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.link http://foo label
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.html file.html
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.caption _Gopher_ by [[https://www.instagram.com/reneefrench/][Renée French]]
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Again, more text
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Blank lines are OK (not mandatory) after the title and after the
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text. Text, bullets, and .code etc. are all optional; title is
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not.
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Lines starting with # in column 1 are commentary.
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Fonts:
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Within the input for plain text or lists, text bracketed by font
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markers will be presented in italic, bold, or program font.
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Marker characters are _ (italic), * (bold) and ` (program font).
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An opening marker must be preceded by a space or punctuation
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character or else be at start of a line; similarly, a closing
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marker must be followed by a space or punctuation character or
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else be at the end of a line. Unmatched markers appear as plain text.
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There must be no spaces between markers. Within marked text,
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a single marker character becomes a space and a doubled single
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marker quotes the marker character.
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_italic_
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*bold*
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`program`
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Markup—_especially_italic_text_—can easily be overused.
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_Why_use_scoped__ptr_? Use plain ***ptr* instead.
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Inline links:
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Links can be included in any text with the form [[url][label]], or
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[[url]] to use the URL itself as the label.
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Functions:
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A number of template functions are available through invocations
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in the input text. Each such invocation contains a period as the
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first character on the line, followed immediately by the name of
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the function, followed by any arguments. A typical invocation might
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be
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.play demo.go /^func show/,/^}/
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(except that the ".play" must be at the beginning of the line and
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not be indented like this.)
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Here follows a description of the functions:
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code:
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Injects program source into the output by extracting code from files
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and injecting them as HTML-escaped <pre> blocks. The argument is
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a file name followed by an optional address that specifies what
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section of the file to display. The address syntax is similar in
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its simplest form to that of ed, but comes from sam and is more
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general. See
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https://plan9.io/sys/doc/sam/sam.html Table II
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for full details. The displayed block is always rounded out to a
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full line at both ends.
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If no pattern is present, the entire file is displayed.
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Any line in the program that ends with the four characters
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OMIT
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is deleted from the source before inclusion, making it easy
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to write things like
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.code test.go /START OMIT/,/END OMIT/
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to find snippets like this
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tedious_code = boring_function()
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// START OMIT
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interesting_code = fascinating_function()
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// END OMIT
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and see only this:
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interesting_code = fascinating_function()
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Also, inside the displayed text a line that ends
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// HL
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will be highlighted in the display; the 'h' key in the browser will
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toggle extra emphasis of any highlighted lines. A highlighting mark
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may have a suffix word, such as
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// HLxxx
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Such highlights are enabled only if the code invocation ends with
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"HL" followed by the word:
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.code test.go /^type Foo/,/^}/ HLxxx
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The .code function may take one or more flags immediately preceding
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the filename. This command shows test.go in an editable text area:
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.code -edit test.go
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This command shows test.go with line numbers:
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.code -numbers test.go
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play:
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The function "play" is the same as "code" but puts a button
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on the displayed source so the program can be run from the browser.
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Although only the selected text is shown, all the source is included
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in the HTML output so it can be presented to the compiler.
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link:
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Create a hyperlink. The syntax is 1 or 2 space-separated arguments.
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The first argument is always the HTTP URL. If there is a second
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argument, it is the text label to display for this link.
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.link http://golang.org golang.org
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image:
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The template uses the function "image" to inject picture files.
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The syntax is simple: 1 or 3 space-separated arguments.
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The first argument is always the file name.
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If there are more arguments, they are the height and width;
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both must be present, or substituted with an underscore.
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Replacing a dimension argument with the underscore parameter
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preserves the aspect ratio of the image when scaling.
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.image images/betsy.jpg 100 200
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.image images/janet.jpg _ 300
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video:
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The template uses the function "video" to inject video files.
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The syntax is simple: 2 or 4 space-separated arguments.
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The first argument is always the file name.
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The second argument is always the file content-type.
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If there are more arguments, they are the height and width;
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both must be present, or substituted with an underscore.
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Replacing a dimension argument with the underscore parameter
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preserves the aspect ratio of the video when scaling.
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.video videos/evangeline.mp4 video/mp4 400 600
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.video videos/mabel.ogg video/ogg 500 _
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background:
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The template uses the function "background" to set the background image for
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a slide. The only argument is the file name of the image.
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.background images/susan.jpg
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caption:
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The template uses the function "caption" to inject figure captions.
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The text after ".caption" is embedded in a figcaption element after
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processing styling and links as in standard text lines.
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.caption _Gopher_ by [[http://www.reneefrench.com][Renée French]]
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iframe:
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The function "iframe" injects iframes (pages inside pages).
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Its syntax is the same as that of image.
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html:
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The function html includes the contents of the specified file as
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unescaped HTML. This is useful for including custom HTML elements
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that cannot be created using only the slide format.
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It is your responsibilty to make sure the included HTML is valid and safe.
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.html file.html
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Presenter notes:
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Presenter notes may be enabled by appending the "-notes" flag when you run
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your "present" binary.
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This will allow you to open a second window by pressing 'N' from your browser
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displaying your slides. The second window is completely synced with your main
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window, except that presenter notes are only visible on the second window.
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Lines that begin with ": " are treated as presenter notes.
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* Title of slide
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Some Text
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: Presenter notes (first paragraph)
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: Presenter notes (subsequent paragraph(s))
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Notes may appear anywhere within the slide text. For example:
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* Title of slide
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: Presenter notes (first paragraph)
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Some Text
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: Presenter notes (subsequent paragraph(s))
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This has the same result as the example above.
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*/
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package present // import "golang.org/x/tools/present"
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