# Re:VIEW Format Guide The document is a brief guide for Re:VIEW markup syntax. Re:VIEW is based on EWB of ASCII (now KADOKAWA), influenced RD and other Wiki system's syntax. This document explains about the format of Re:VIEW 3.0. ## Paragraph Paragraphs are separated by an empty line. Usage: ``` This is a paragraph, paragraph, and paragraph. Next paragraph here is ... ``` Two empty lines or more are same as one empty line. ## Chapter, Section, Subsection (headings) Chapters, sections, subsections, subsubsections use `=`, `==`, `===`, `====`, `=====`. You should add one or more spaces after `=`. Usage: ```review = 1st level (chapter) == 2nd level (section) === 3rd level (subsection) ==== 4th level ===== 5th level ``` Headings should not have any spaces before title; if line head has space, it is as paragraph. You should add emply lines between Paragraphs and Headings. ## Column `[column]` in a heading are column's caption. Usage: ```review ===[column] Compiler-compiler ``` `=` and `[column]` should be closed to. Any spaces are not permitted. Columns are closed with next headings. ``` == head 01 ===[column] a column == head 02 and the end of 'a column' ``` If you want to close column without headings, you can use `===[/column]` Usage: ```review ===[column] Compiler-compiler Compiler-compiler is ... ===[/column] blah, blah, blah (this is paragraphs outside of the column) ``` There are some more options of headings. * `[nonum]` : no numbering, but add it into TOC (Table of Contents). * `[nodisp]` : not display in document, only in TOC. * `[notoc]` : no numbering, not in TOC. ## Itemize Itemize (ul in HTML) uses ` *` (one space char and asterisk). Nested itemize is like ` **`, ` ***`. Usage: ``` * 1st item ** nested 1st item * 2nd item ** nested 2nd item * 3rd item ``` In itemize, you must write one more space character at line head. When you use `*` without spaces in line head, it's just paragraph. You should add emply lines between Paragraphs and Itemize (same as Ordered and Non-Orderd). ## Ordered Itemize Ordered itemize (ol in HTML) uses ` 1. ...`, ` 2. ...`, ` 3. ...`. They aren't nested. Usage: ``` 1. 1st condition 2. 2nd condition 3. 3rd condition ``` The value of Number is ignored. ``` 1. 1st condition 1. 2nd condition 1. 3rd condition ``` You must write one more space character at line head like itemize. ## Definition List Definition list (dl in HTML) use `:` and indented lines. Usage: ```review : Alpha RISC CPU made by DEC. : POWER RSIC CPU made by IBM and Motolora. POWER PC is delivered from this. : SPARC RISC CPU made by SUN. ``` `:` in line head is not used as a text. The text after `:` is as the term (dt in HTML). In definition list, `:` at line head allow space characters. After dt line, space-indented lines are descriptions(dd in HTML). You can use inline markup in texts of lists. ## Block Commands and Inline Commands With the exception of headings and lists, Re:VIEW supports consistent syntax. Block commands are used for multiple lines to add some actions (ex. decoration). The syntax of block commands is below: ``` //command[option1][option2]...{ (content lines, sometimes separated by empty lines) ... //} ``` If there is no options, the begining line is just `//command{`. When you want to use a character `]`, you must use escaping `\]`. Some block commands has no content. ``` //command[option1][option2]... ``` Inline commands are used in block, paragraphes, headings, block contents and block options. ``` @{content} ``` When you want to use a character `}` in inline content, you must use escaping `\}`. If the content ends with `\`, it must be written `\\`. (ex. `@{\\}`) There are some limitations in blocks and inlines. * Block commands do not support nestins. You cannot write blocks in another block. * You cannot write headings and itemize in block contents. * Inline commands also do not support nestins. You cannot write inlines in another inline. ### Fence notation for inline commands You may be tired of escaping when you use a large number of inline commands including `{` and `\`. By surrounding the contents with `$ $` or `| |` instead of `{ }`, you can write without escaping. ``` @$content$ @|content| ``` Example: ```review @$\Delta = \frac{\partial^2}{\partial x_1^2}+\frac{\partial^2}{\partial x_2^2} + \cdots + \frac{\partial^2}{\partial x_n^2}$ @|if (exp) then { ... } else { ... }| @|\| ``` Since this notation is substitute, please avoid abuse. ## Code List Code list like source codes is `//list`. If you don't need numbers, you can use ``em`` prefix (as embedded). If you need line numbers, you can use ``num`` postfix. So you can use four types of lists. * ``//list[ID][caption][language]{ ... //}`` * normal list. language is optional. * ``//listnum[ID][caption][language]{ ... //}`` * normal list with line numbers. language is optional. * ``//emlist[caption][language]{ ... //}`` * list without caption counters. caption and language are optional. * ``//emlistnum[caption][language]{ ... //}`` * list with line numbers without caption counters. caption and language are optional. Usage: ```review //list[main][main()][c]{ ←ID is `main`, caption is `main()` int main(int argc, char **argv) { puts("OK"); return 0; } //} ``` Usage: ```review //listnum[hello][hello world][ruby]{ puts "hello world!" //} ``` Usage: ```review //emlist[][c]{ printf("hello"); //} ``` Usage: ```review //emlistnum[][ruby]{ puts "hello world!" //} ``` The Language option is used for highlightings. You can use inline markup in blocks. When you refer a list like `see list X`, you can use an ID in `//list` such as `@{main}`. When you refer a list in the other chapter, you can use an ID with chapter ID, such like `@{advanced|main}`, to refer a list `main` in `advanced.re`. ### define line number of first line in code block If you want to start with specified number as line number, you can use `firstlinenum` command. Usage: ```review //firstlinenum[100] //listnum[hello][helloworld][ruby]{ puts "hello world!" //} ``` ### Quoting Source Code `//source` is for quoting source code. filename is mandatory. Usage: ```review //source[/hello/world.rb]{ puts "hello world!" //} ``` `//source` and `//emlist` with caption is not so different. You can use them with different style with CSS (in HTML) and style file (in LaTeX). `//source` can be referred same as the list. Usage: ``` When you ..., see @{hello}. ``` ## Inline Source Code You can use `@{...}` in inline context. Usage: ```review @{p = obj.ref_cnt} ``` ## Shell Session When you want to show command line operation, you can use `//cmd{ ... //}`. You can use inline commands in this command. Usage: ``` //cmd{ $ @{ls /} //} ``` You can use inline markup in `//cmd` blocks. ## Figure You can use `//image{ ... //}` for figures. You can write comments or Ascii art in the block as an alternative description. When publishing, it's simply ignored. Usage: ``` //image[unixhistory][a brief history of UNIX-like OS]{ System V +----------- SVr4 --> Commercial UNIX(Solaris, AIX, HP-UX, ...) V1 --> V6 --| +--------- 4.4BSD --> FreeBSD, NetBSD, OpenBSD, ... BSD --------------> Linux //} ``` The third option is used to define the scale of images. `scale=X` is scaling for page width (`scale=0.5` makes image width to be half of page width). When you want to refer images such as "see figure 1.", you can use inline reference markup like `@{unixhistory}`. When you refer a image in the other chapter, you can use the same way as a list reference. To refer a image `unixhistory` in `advanced.re`, use `@{advanced|unixhistory}`. When you want to use images in paragraph or other inline context, you can use `@`. ### Finding image pathes The order of finding image is as follows. The first matched one is used. ``` 1. ///. 2. //-. 3. //. 4. //. 5. /-. 6. /. ``` * ```` is `images` as default. * ```` is a builder (target) name to use. When you use review-comile commmand with ``--target=html``, `/` is `images/html`. * ```` is basename of *.re file. If the filename is `ch01.re`, chapid is `ch01`. * ```` is the ID of the first argument of `//image`. You should use only printable ASCII characters as ID. * ```` is file extensions of Re:VIEW. They are different by the builder you use. For each builder, image files are searched in order of the following extensions, and the first hit file is adopted. * HTMLBuilder (EPUBMaker, WEBMaker), MARKDOWNBuilder: .png, .jpg, .jpeg, .gif, .svg * LATEXBuilder (PDFMaker): .ai, .eps, .pdf, .tif, .tiff, .png, .bmp, .jpg, .jpeg, .gif * Other builders: .ai, .psd, .eps, .pdf, .tif, .tiff, .png, .bmp, .jpg, .jpeg, .gif, .svg ### Inline Images When you want to use images in paragraph, you can use the inline command `@{ID}`. The order of finding images are same as `//image`. ## Images without caption counter `//indepimage[filename][caption]` makes images without caption counter. caption is optional. Usage: ``` //indepimage[unixhistory2] ``` Note that there are similar markup `//numberlessimage`, but it is deprecated. ## Figures with graph tools Re:VIEW generates image files using graph tool with command `//graph[filename][commandname][caption]`. The caption is optional. Usage: using with Gnuplot ``` //graph[sin_x][gnuplot]{ plot sin(x) //} ``` You can use `graphviz`, `gnuplot`, `blockdiag`, `aafigure`, and `plantuml` as the command name. Before using these tools, you should installed them and configured path appropriately. * Graphviz ( https://www.graphviz.org/ ) : set path to `dot` command * Gnuplot ( http://www.gnuplot.info/ ) : set path to `gnuplot` command * Blockdiag ( http://blockdiag.com/ ) : set path to `blockdiag` command. Install ReportLab also to make a PDF * aafigure ( https://launchpad.net/aafigure ) : set path to `aafigure` command * PlantUML ( http://plantuml.com/ ) : set path to `java` command. place `plantuml.jar` on working folder ## Tables The markup of table is `//table[ID][caption]{ ... //}` You can separate header and content with `------------`. The columns are splitted by TAB character. Write `.` to blank cells. When the first character in the cell is `.`, the character is removed. If you want to write `.` at the first, you should write `..`. When you want to use an empty column, you write `.`. Usage: ``` //table[envvars][Important environment varialbes]{ Name Comment ------------------------------------------------------------- PATH Directories where commands exist TERM Terminal. ex: linux, kterm, vt100 LANG default local of users. ja_JP.eucJP and ja_JP.utf8 are popular in Japan LOGNAME login name of the user TEMP temporary directory. ex: /tmp PAGER text viewer on man command. ex: less, more EDITOR default editor. ex: vi, emacs MANPATH Directories where sources of man exist DISPLAY default display of X Window System //} ``` When you want to write "see table X", you can write `@{envvars}`. You can use inline markup in the tables. `//table` without arguments creates a table without numbering and captioning. ``` //table{ ... //} ``` To create a table without numbering but with captioning, use `//emtable`. ``` //emtable[caption]{ ... //} ``` ### Column width of table When using LaTeX or IDGXML builder, you can specify each column width of the table with `//tsize` block command. ``` //tsize[|builder|width-of-column1,width-of-column2,...] ``` * The collumn width is specified in mm. * For IDGXML, if only 1st of the three columns is specified, the remaining 2nd and 3rd columns will be the width of the remainder of the live area width equally divided. It is not possible to specify that only the 1st and 3rd columns are specified. * For LaTeX, you have to specify all column widths. * For LaTeX, you can also directly specify the column parameter of LaTeX table macro like `//tsize[|latex||p{20mm}cr|]`. * In other builders such as HTML, this command is simply ignored. ### Complex Table If you want to use complex tables, you can use `imgtable` block command with an image of the table. `imgtable` supports numbering and `@
`. Usage: ``` //imgtable[complexmatrix][very complex table]{ to use image "complexmatrix". The rule of finding images is same as image command. //} ``` ## Quoting Text You can use `//quote{ ... //}` as quotations. Usage: ``` //quote{ Seeing is believing. //} ``` You can use inline markup in quotations. ## Short column Some block commands are used for short column. * `//note[caption]{ ... //}` * `//memo[caption]{ ... //}` * `//tip[caption]{ ... //}` * `//info[caption]{ ... //}` * `//warning[caption]{ ... //}` * `//important[caption]{ ... //}` * `//caution[caption]{ ... //}` * `//notice[caption]{ ... //}` `[caption]` is optional. The content is like paragraph; separated by empty lines. ## Footnotes You can use `//footnote` to write footnotes. Usage: ``` You can get the packages from support site for the book.@{site} You should get and install it before reading the book. //footnote[site][support site of the book: http://i.loveruby.net/ja/stdcompiler ] ``` `@{site}` in source are replaced by footnote marks, and the phrase "support site of .." is in footnotes. Note that In LATEXBuilder, you should use `footnotetext` option to use `@{...}` in columns and tables. ### `footnotetext` option By adding `footnotetext:true` in config.yml, you can use footnote in tables and short notes. Note that there are some constraints that (because of normal footnote ) And you cannot use footnote and footnotemark/footnotetext at the same time. Note that with this option, Re:VIEW use footnotemark and footnotetext instead of normal footnote. There are some constraints to use this option. You cannot use footnote and footnotemark/footnotetext at the same time. ## Bibliography When you want to use a bibliography, you should write them in the file `bib.re`. ``` //bibpaper[cite][caption]{..comment..} ``` The comment is optional. ``` //bibpaper[cite][caption] ``` Usage: ``` //bibpaper[lins][Lins, 1991]{ Refael D. Lins. A shared memory architecture for parallel study of algorithums for cyclic reference_counting. Technical Report 92, Computing Laboratory, The University of Kent at Canterbury , August 1991 //} ``` When you want to refer some references, You should write as: Usage: ``` … is the well-known project.(@{lins}) ``` ## Lead Sentences lead sentences are `//lead{ ... //}`. You can write as `//read{ ... //}`. Usage: ``` //lead{ In the chapter, I introduce brief summary of the book, and I show the way how to write a program in Linux. //} ``` ## TeX Equations You can use `//texequation{ ... //}` to insert mathematical equations of LaTeX. Usage: ``` //texequation{ \sum_{i=1}^nf_n(x) //} ``` If you'd like to assign a number like 'Equation 1.1`, specify the identifier and caption. ``` //texequationl[emc][The Equivalence of Mass and Energy]{ \sum_{i=1}^nf_n(x) //} ``` To reference this, use the inline command `@`. There is `@{ ... }` for inline (see "Fence notation for inline commands" section also). Whether LaTeX formula is correctly displayed or not depends on the processing system. PDFMaker uses LaTeX internally, so there is no problem. EPUBMaker and WEBMaker use either MathML transformation or imaging. ### MathML case Install MathML library (`gem install math_ml`). Specify in config.yml as follows: ``` mathml: true ``` Whether it is displayed properly in MathML depends on your viewer or browser. ### imaging case This way calls LaTeX internally and images it with an external tool. Image files will be placed in `images/_review_math` folder. You need TeXLive or other LaTeX environment. Modify the parameters of `texcommand`,` texoptions`, `dvicommand`,` dvioptions` in config.yml as necessary. In addition, external tools for image conversion are also needed. Currently, it supports the following two methods. - `pdfcrop`: cut out the formula using `pdfcrop` command (included in TeXLive) and image it. By default, `pdftocairo` command is used (included in Poppler library). You can change it to another tool if available on the command line. - `dvipng`: it uses [dvipng](https://ctan.org/pkg/dvipng) to cut out and to image. You can install with OS package or `tlmgr install dvipng`. By setting in config.yml, ``` imgmath: true ``` it is set as follows: ``` imgmath_options: # format. png|svg format: png # conversion method. pdfcrop|dvipng converter: pdfcrop # custom preamble file (default: for upLaTeX+jsarticle.cls, see lib/review/makerhelper.rb#default_imgmath_preamble) preamble_file: null # default font size fontsize: 10 # default line height lineheight: 12 # pdfcrop command. # %i: filename for input %o: filename for output pdfcrop_cmd: "pdfcrop --hires %i %o" # imaging command. # %i: filename for input %o: filename for output %O: filename for output without the extension # %p: page number pdfcrop_pixelize_cmd: "pdftocairo -png -r 90 -f %p -l %p -singlefile %i %O" # whether to generate a single PDF page for pdfcrop_pixelize_cmd. extract_singlepage: null # command line to generate a single PDF page file. pdfextract_cmd: "pdfjam -q --outfile %o %i %p" # dvipng command. dvipng_cmd: "dvipng -T tight -z 9 -p %p -l %p -o %o %i" ``` For example, to make SVG: ``` imgmath: true imgmath_options: format: svg pdfcrop_pixelize_cmd: "pdftocairo -svg -r 90 -f %p -l %p -singlefile %i %o" ``` By default, the command specified in `pdfcrop_pixelize_cmd` takes the filename of multi-page PDF consisting of one formula per page. If you want to use the `sips` command or the` magick` command, they can only process a single page, so you need to set `extract_singlepage: true` to extract the specified page from the input PDF. `pdfjam` command (in TeXLive) is used to extract pages. ``` imgmath: true imgmath_options: extract_singlepage: true # use pdftk instead of default pdfjam (for Windows) pdfextract_cmd: "pdftk A=%i cat A%p output %o" # use ImageMagick pdfcrop_pixelize_cmd: "magick -density 200x200 %i %o" # use sips pdfcrop_pixelize_cmd: "sips -s format png --out %o %i" ``` To set the same setting as Re:VIEW 2: ``` imgmath: true imgmath_options: converter: dvipng fontsize: 12 lineheight: 14.3 ``` ## Spacing `//noindent` is a tag for spacing. * `//noindent` : ingore indentation immediately following line. (in HTML, add `noindent` class) ## Blank line `//blankline` put an empty line. Usage: ``` Insert one blank line below. //blankline Insert two blank line below. //blankline //blankline ``` ## Referring headings There are 3 inline commands to refer a chapter. These references use Chapter ID. The Chapter ID is filename of chapter without extentions. For example, Chapter ID of `advanced.re` is `advance`. * `@{ChapterID}` : chapter number (ex. `Chapter 17`). * `@{ChapterID}` : chapter title * `@<chapref>{ChapterID}` : chapter number and chapter title (ex. `Chapter 17. other topics`). `@<hd>` generate referred section title and section number. You can use deeper section with separator `|`. Usage: ``` @<hd>{intro|first section} ``` If section title is unique, `|` is not needed. ``` @<hd>{first section} ``` If you want to refer another chapter (file), you should add the chapter ID. Usage: ``` @<hd>{preface|Introduction|first section} ``` When section has the label, you can use the label. ``` =={intro} Introduction : === first section : @<hd>{intro|first section} ``` ### Heading of columns You can refer the heading of a column with `@<column>`. Usage: ``` @<column>{The usage of Re:VIEW} ``` You can refer labels. ``` ==[column]{review-application} The application of Re:VIEW : @<column>{review-application} ``` ## Links You can add a hyperlink with `@<href>` and `//label`. Notation of the markup is `@<href>{URL, anchor}`. If you can use URL itself as anchor, use `@<href>{URL}`. If you want to use `,` in URL, use `\,`. Usage: ``` @<href>{http://github.com/, GitHub} @<href>{http://www.google.com/} @<href>{#point1, point1 in document} @<href>{chap1.html#point1, point1 in document} //label[point1] ``` ## Words file By creating a word file with key / value pair, `@<w>{key}` or `@<wb>{key}` will be expanded the key to the corresponding value. `@<wb>` means bold style. This word file is a CSV file with extension .csv. This first columns is the key, the second row is the value. ``` "LGPL","Lesser General Public License" "i18n","""i""nternationalizatio""n""" ``` Specify the word file path in `words_file` parameter of `config.yml`. Usage: ```review @<w>{LGPL}, @<wb>{i18n} ``` (In HTML:) ``` Lesser General Public License, ★"i"nternationalizatio"n"☆ ``` Values are escaped by the builder. It is not possible to include inline commands in the value. ## Comments If you want to write some comments that do not output in the document, you can use comment notation `#@#`. Usage: ``` #@# Must one empty line ``` If you want to write some warnings, use `#@warn(...)`. Usage: ``` #@warn(TBD) ``` When you want to write comments in the output document, use `//comment` and `@<comment>` with the option `--draft` of review-compile command. Usage: ``` @<comment>{TODO} ``` ## Raw Data Block When you want to write non-Re:VIEW line, use `//raw` or `//embed`. ### `//raw` block Usage: ``` //raw[|html|<div class="special">\nthis is a special line.\n</div>] ``` In above line, `html` is a builder name that handle raw data. You can use `html`, `latex`, `idgxml` and `top` as builder name. You can specify multiple builder names with separator `,`. `\n` is translated into newline(U+000A). Output: (In HTML:) ``` <div class="special"> this is a special line. </div> ``` (In other formats, it is just ignored.) Note: `//raw` and `@<raw>` may break structured document easily. ### `//embed` block Usage: ``` //embed{ <div class="special"> this is a special line. </div> //} //embed[html,markdown]{ <div class="special"> this is a special line. </div> //} ``` In above line, `html` and `markdown` is a builder name that handle raw data. Output: (In HTML:) ``` <div class="special"> this is a special line. </div> ``` (In other formats, it is just ignored.) ## Inline Commands ### Styles ``` @<kw>{Credential, credential}:: keyword. @<bou>{appropriate}:: bou-ten. @<ami>{point}:: ami-kake (shaded text) @<u>{AB}:: underline @<b>{Please}:: bold @<i>{Please}:: italic @<strong>{Please}:: strong(emphasis) @<em>{Please}:: another emphasis @<tt>{foo($bar)}:: teletype (monospaced font) @<tti>{FooClass}:: teletype (monospaced font) and italic @<ttb>{BarClass}:: teletype (monospaced font) and bold @<code>{a.foo(bar)}:: teletype (monospaced font) for fragments of code @<tcy>{}:: short horizontal text in vertical text ``` ### References ``` @<chap>{advanced}:: chapter number like `Chapter 17` @<title>{advanced}:: title of the chapter @<chapref>{advanced}:: a chapter number and chapter title like `Chapter 17. advanced topic` @<list>{program}:: `List 1.5` @<img>{unixhistory}:: `Figure 1.3` @<table>{ascii}:: `Table 1.2` @<eq>{emc2}:: `Equation 1.1` @<hd>{advanced|Other Topics}:: `7-3. Other Topics` @<column>{another-column}:: reference of column. ``` ### Other inline commands ``` @<ruby>{Matsumoto, Matz}:: ruby markups @<br>{}:: linebreak in paragraph @<uchar>{2460}:: Unicode code point @<href>{http://www.google.com/, google}:: hyper link(URL) @<icon>{samplephoto}:: inline image @<m>{a + \alpha}:: TeX inline equation @<w>{key}:: expand the value corresponding to the key. @<wb>{key}:: expand the value corresponding to the key with bold style. @<raw>{|html|<span>ABC</span>}:: inline raw data inline. `\}` is `}`, `\\` is `\`, and `\n` is newline. @<embed>{|html|<span>ABC</span>}:: inline raw data inline. `\}` is `}` and `\\` is `\`. @<idx>{string}:: output a string and register it as an index. See makeindex.md. @<hidx>{string}:: register a string as an index. A leveled index is expressed like `parent<<>>child` @<balloon>{abc}:: inline balloon in code block. For example, `@<balloon>{ABC}` produces `←ABC`. This may seem too simple. To decorate it, modify the style sheet file or override a function by `review-ext.rb` ``` ## Commands for Authors (pre-processor commands) These commands are used in the output document. In contrast, commands as below are not used in the output document, used by the author. ``` #@#:: Comments. All texts in this line are ignored. #@warn(...):: Warning messages. The messages are showed when pre-process. #@require, #@provide:: Define dependency with keywords. #@mapfile(filename) ... #@end:: Insert all content of files. #@maprange(filename, range name) ... #@end:: Insert some area in content of files. #@mapoutput(command) ... #@end:: Execute command and insert their output. ``` You should use these commands with preprocessor command `review-preproc`. ## Internationalization (i18n) Re:VIEW support I18N of some text like `Chapter`, `Figure`, and `Table`. Current default language is Japanese. You add the file locale.yml in the project directory. Sample local.yml file: ```yaml locale: en ``` If you want to customize texts, overwrite items. Default locale configuration file is in lib/review/i18n.yml. Sample local.yml file: ```yaml locale: en image: Fig. table: Tbl. ``` ### Re:VIEW Custom Format In `locale.yml`, you can use these Re:VIEW custom format. * `%pA` : Alphabet (A, B, C, ...) * `%pa` : alphabet (a, b, c, ...) * `%pAW` : Alphabet (Large Width) A, B, C, ... * `%paW` : alphabet (Large Width) a, b, c, ... * `%pR` : Roman Number (I, II, III, ...) * `%pr` : roman number (i, ii, iii, ...) * `%pRW` : Roman Number (Large Width) Ⅰ, Ⅱ, Ⅲ, ... * `%pJ` : Chainese Number 一, 二, 三, ... * `%pdW' : Arabic Number (Large Width for 0..9) 1, 2, ...,9, 10, ... * `%pDW' : Arabic Number (Large Width) 1, 2, ... 10, ... Usage: ``` locale: en part: Part. %pRW appendix: Appendix. %pA ``` ## Other Syntax In Re:VIEW, you can add your customized blocks and inlines. You can define customized commands in the file `review-ext.rb`. Usage: ```ruby # review-ext.rb ReVIEW::Compiler.defblock :foo, 0..1 class ReVIEW::HTMLBuilder def foo(lines, caption = nil) puts lines.join(",") end end ``` You can add the syntax as below: ``` //foo{ A B C //} ``` ``` # Result A,B,C ``` ## HTML/LaTeX Layout `layouts/layout.html.erb` and `layouts/layout.tex.erb` are used as layout file. You can use ERb tags in the layout files. Sample layout file(layout.html.erb): ```html <html> <head> <title><%= @config["booktitle"] %> <%= @body %>
```