Go Present - generate slides for presentations with Go

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package present

import "golang.org/x/tools/present"

The present file format

Present files have the following format. The first non-blank non-comment line is the title, so the header looks like

Title of documentSubtitle of document15:04 2 Jan 2006Tags: foo, bar, baz<blank line>Author NameJob title, [email protected]://url/@twitter_name

The subtitle, date, and tags lines are optional.

The date line may be written without a time:

2 Jan 2006

In this case, the time will be interpreted as 10am UTC on that date.

The tags line is a comma-separated list of tags that may be used to categorize the document.

The author section may contain a mixture of text, twitter names, and links. For slide presentations, only the plain text lines will be displayed on the first slide.

Multiple presenters may be specified, separated by a blank line.

After that come slides/sections, each after a blank line:

* Title of slide or section (must have asterisk)Some Text** Subsection- bullets- more bullets- a bullet with*** Sub-subsectionSome More text Preformatted text is indented (however you like)Further Text, including invocations like:.code x.go /^func main/,/^}/.play y.go.image image.jpg.iframe http://foo.link http://foo label.html file.html.caption _Gopher_ by [[http://www.reneefrench.com][Renée French]]Again, more text

Blank lines are OK (not mandatory) after the title and after the text. Text, bullets, and .code etc. are all optional; title is not.

Lines starting with # in column 1 are commentary.

Fonts:

Within the input for plain text or lists, text bracketed by font markers will be presented in italic, bold, or program font. Marker characters are _ (italic), * (bold) and ` (program font). Unmatched markers appear as plain text. Within marked text, a single marker character becomes a space and a doubled single marker quotes the marker character.

_italic_*bold*`program`_this_is_all_italic__Why_use_scoped__ptr_? Use plain ***ptr* instead.

Inline links:

Links can be included in any text with the form [[url][label]], or [[url]] to use the URL itself as the label.

Functions:

A number of template functions are available through invocations in the input text. Each such invocation contains a period as the first character on the line, followed immediately by the name of the function, followed by any arguments. A typical invocation might be

.play demo.go /^func show/,/^}/

(except that the ".play" must be at the beginning of the line and not be indented like this.)

Here follows a description of the functions:

code:

Injects program source into the output by extracting code from files and injecting them as HTML-escaped <pre> blocks. The argument is a file name followed by an optional address that specifies what section of the file to display. The address syntax is similar in its simplest form to that of ed, but comes from sam and is more general. See

http://plan9.bell-labs.com/sys/doc/sam/sam.html Table II

for full details. The displayed block is always rounded out to a full line at both ends.

If no pattern is present, the entire file is displayed.

Any line in the program that ends with the four characters

OMIT

is deleted from the source before inclusion, making it easy to write things like

.code test.go /START OMIT/,/END OMIT/

to find snippets like this

tedious_code = boring_function()// START OMITinteresting_code = fascinating_function()// END OMIT

and see only this:

interesting_code = fascinating_function()

Also, inside the displayed text a line that ends

// HL

will be highlighted in the display; the 'h' key in the browser will toggle extra emphasis of any highlighted lines. A highlighting mark may have a suffix word, such as

// HLxxx

Such highlights are enabled only if the code invocation ends with "HL" followed by the word:

.code test.go /^type Foo/,/^}/ HLxxx

The .code function may take one or more flags immediately preceding the filename. This command shows test.go in an editable text area:

.code -edit test.go

This command shows test.go with line numbers:

.code -numbers test.go

play:

The function "play" is the same as "code" but puts a button on the displayed source so the program can be run from the browser. Although only the selected text is shown, all the source is included in the HTML output so it can be presented to the compiler.

link:

Create a hyperlink. The syntax is 1 or 2 space-separated arguments. The first argument is always the HTTP URL. If there is a second argument, it is the text label to display for this link.

.link http://golang.org golang.org

image:

The template uses the function "image" to inject picture files.

The syntax is simple: 1 or 3 space-separated arguments. The first argument is always the file name. If there are more arguments, they are the height and width; both must be present, or substituted with an underscore. Replacing a dimension argument with the underscore parameter preserves the aspect ratio of the image when scaling.

.image images/betsy.jpg 100 200.image images/janet.jpg _ 300

caption:

The template uses the function "caption" to inject figure captions.

The text after ".caption" is embedded in a figcaption element after processing styling and links as in standard text lines.

.caption _Gopher_ by [[http://www.reneefrench.com][Renée French]]

iframe:

The function "iframe" injects iframes (pages inside pages). Its syntax is the same as that of image.

html:

The function html includes the contents of the specified file as unescaped HTML. This is useful for including custom HTML elements that cannot be created using only the slide format. It is your responsibilty to make sure the included HTML is valid and safe.

.html file.html Index¶ Variables func Register(name string, parser ParseFunc) func Style(s string) template.HTML func Template() *template.Template type Author func (p *Author) TextElem() (elems []Elem) type Caption func (c Caption) TemplateName() string type Code func (c Code) TemplateName() string type Context func (ctx *Context) Parse(r io.Reader, name string, mode ParseMode) (*Doc, error) type Doc func Parse(r io.Reader, name string, mode ParseMode) (*Doc, error) func (d *Doc) Render(w io.Writer, t *template.Template) error type Elem type HTML func (s HTML) TemplateName() string type Iframe func (i Iframe) TemplateName() string type Image func (i Image) TemplateName() string type Lines type Link func (l Link) TemplateName() string type List func (l List) TemplateName() string type ParseFunc type ParseMode type Section func (s Section) FormattedNumber() string func (s Section) Level() int func (s *Section) Render(w io.Writer, t *template.Template) error func (s Section) Sections() (sections []Section) func (s Section) TemplateName() string type Text func (t Text) TemplateName() string Examples¶ Style Package Files¶

args.go caption.go code.go doc.go html.go iframe.go image.go link.go parse.go style.go

Variables¶ ❖ var PlayEnabled = false

Is the playground available?

func Register¶ ❖ func Register(name string, parser ParseFunc)

Register binds the named action, which does not begin with a period, to the specified parser to be invoked when the name, with a period, appears in the present input text.

func Style¶ ❖ func Style(s string) template.HTML

Style returns s with HTML entities escaped and font indicators turned into HTML font tags.

Example

Code:

const s = "*Gophers* are _clearly_ > *cats*!"fmt.Println(Style(s))

Output:

<b>Gophers</b> are <i>clearly</i> > <b>cats</b>! func Template¶ ❖ func Template() *template.Template

Template returns an empty template with the action functions in its FuncMap.

type Author¶ ❖ type Author struct { Elem []Elem}

Author represents the person who wrote and/or is presenting the document.

func (*Author) TextElem¶ ❖ func (p *Author) TextElem() (elems []Elem)

TextElem returns the first text elements of the author details. This is used to display the author' name, job title, and company without the contact details.

type Caption¶ ❖ type Caption struct { Text string} func (Caption) TemplateName¶ ❖ func (c Caption) TemplateName() string type Code¶ ❖ type Code struct {Text template.HTMLPlay bool // runnable codeFileName string // file nameExt string // file extensionRaw []byte // content of the file} func (Code) TemplateName¶ ❖ func (c Code) TemplateName() string type Context¶ ❖ type Context struct { // ReadFile reads the file named by filename and returns the contents. ReadFile func(filename string) ([]byte, error)}

A Context specifies the supporting context for parsing a presentation.

func (*Context) Parse¶ ❖ func (ctx *Context) Parse(r io.Reader, name string, mode ParseMode) (*Doc, error)

Parse parses a document from r.

type Doc¶ ❖ type Doc struct {TitlestringSubtitle stringTime time.TimeAuthors []AuthorSections []SectionTags []string}

Doc represents an entire document.

func Parse¶ ❖ func Parse(r io.Reader, name string, mode ParseMode) (*Doc, error)

Parse parses a document from r. Parse reads assets used by the presentation from the file system using ioutil.ReadFile.

func (*Doc) Render¶ ❖ func (d *Doc) Render(w io.Writer, t *template.Template) error

Render renders the doc to the given writer using the provided template.

type Elem¶ ❖ type Elem interface { TemplateName() string}

Elem defines the interface for a present element. That is, something that can provide the name of the template used to render the element.

type HTML¶ ❖ type HTML struct { template.HTML} func (HTML) TemplateName¶ ❖ func (s HTML) TemplateName() string type Iframe¶ ❖ type Iframe struct { URL string Width int Height int} func (Iframe) TemplateName¶ ❖ func (i Iframe) TemplateName() string type Image¶ ❖ type Image struct { URL string Width int Height int} func (Image) TemplateName¶ ❖ func (i Image) TemplateName() string type Lines¶ ❖ type Lines struct { // contains filtered or unexported fields}

Lines is a helper for parsing line-based input.

type Link¶ ❖ type Link struct { URL *url.URL Label string} func (Link) TemplateName¶ ❖ func (l Link) TemplateName() string type List¶ ❖ type List struct { Bullet []string}

List represents a bulleted list.

func (List) TemplateName¶ ❖ func (l List) TemplateName() string type ParseFunc¶ ❖ type ParseFunc func(ctx *Context, fileName string, lineNumber int, inputLine string) (Elem, error) type ParseMode¶ ❖ type ParseMode int

ParseMode represents flags for the Parse function.

❖ const ( // If set, parse only the title and subtitle. TitlesOnly ParseMode = 1) type Section¶ ❖ type Section struct { Number []int Title string Elem []Elem}

Section represents a section of a document (such as a presentation slide) comprising a title and a list of elements.

func (Section) FormattedNumber¶ ❖ func (s Section) FormattedNumber() string

FormattedNumber returns a string containing the concatenation of the numbers identifying a Section.

func (Section) Level¶ ❖ func (s Section) Level() int

Level returns the level of the given section. The document title is level 1, main section 2, etc.

func (*Section) Render¶ ❖ func (s *Section) Render(w io.Writer, t *template.Template) error

Render renders the section to the given writer using the provided template.

func (Section) Sections¶ ❖ func (s Section) Sections() (sections []Section) func (Section) TemplateName¶ ❖ func (s Section) TemplateName() string type Text¶ ❖ type Text struct { Lines []string Pre bool}

Text represents an optionally preformatted paragraph.

func (Text) TemplateName¶ ❖ func (t Text) TemplateName() string


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