Weave.jl/doc/src/usage.md

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# Using Weave
You can write your documentation and code in input document using Noweb or Markdown syntax and use `weave` function to execute to document to capture results and figures.
## Weave
Weave document with markup and julia code using Gadfly for plots,
`out_path = :pwd` makes the results appear in the current working directory.
```julia
using Weave
weave(Pkg.dir("Weave","examples","gadfly_sample.mdw"), out_path = :pwd)
```
Using PyPlot:
```julia
weave(Pkg.dir("Weave","examples","julia_sample.mdw"), plotlib="PyPlot", out_path = :pwd)
```
{docs}
weave(source)
## Weave from shell
You can also use the `weave.jl` script under bin directory to weave documents
from the shell:
```
$ ./weave.jl
usage: weave.jl [--doctype DOCTYPE] [--plotlib PLOTLIB]
[--informat INFORMAT] [--out_path OUT_PATH]
[--fig_path FIG_PATH] [--fig_ext FIG_EXT] source...
```
## Tangle
Tangling extracts the code from document:
{docs}
tangle(source)
## Supported formats
You can get a list of supported output formats:
```
julia> list_out_formats()
pandoc: Pandoc markdown
rst: reStructuredText and Sphinx
texminted: Latex using minted for highlighting
github: Github markdown
md2html: Markdown to HTML (requires Pandoc)
md2pdf: Markdown to pdf (requires Pandoc and xelatex)
asciidoc: AsciiDoc
tex: Latex with custom code environments
```
{docs}
list_out_formats()
## Document syntax
Weave uses noweb or markdown syntax for defining the code chunks and documentation chunks.
## Noweb
### Code chunks
start with a line marked with `<<>>=` or `<<options>>=` and end with line marked with `@`. The code between the start and end markers is executed and the output is captured to the output document. See for options below.
### Documentation chunks
Are the rest of the document (between `@` and `<<>>=` lines and the first chunk be default) and can be written with several different markup languages.
[Sample document]( https://github.com/mpastell/Weave.jl/blob/master/examples/julia_sample.mdw)
## Markdown
Markdown code chunks are defined using fenced code blocks. [See sample document:](https://github.com/mpastell/Weave.jl/blob/master/examples/gadfly_sample.jmd)