4. Output Formats

4. Output Formats

When the source is parsed, and have been processed it is time to render the output. We will consider the following source snippet:

# # Rational numbers
#
# In julia rational numbers can be constructed with the `//` operator.
# Lets define two rational numbers, `x` and `y`:

x = 1//3
#-
y = 2//5

# When adding `x` and `y` together we obtain a new rational number:

z = x + y

and see how this is rendered in each of the output formats.

4.1. Markdown Output

The (default) markdown output of the source snippet above is as follows

```@meta
EditURL = "https://github.com/fredrikekre/Literate.jl/blob/master/docs/src/outputformats.jl"
```

# Rational numbers

In julia rational numbers can be constructed with the `//` operator.
Lets define two rational numbers, `x` and `y`:

```@example name
x = 1//3
```

```@example name
y = 2//5
```

When adding `x` and `y` together we obtain a new rational number:

```@example name
z = x + y
```

We note that lines starting with # are printed as regular markdown, and the code lines have been wrapped in @example blocks. We also note that an @meta block have been added, that sets the EditURL variable. This is used by Documenter to redirect the "Edit on GitHub" link for the page, see Interaction with Documenter.

Some of the output rendering can be controlled with keyword arguments to Literate.markdown:

Literate.markdown — Function.
Literate.markdown(inputfile, outputdir; kwargs...)

Generate a markdown file from inputfile and write the result to the directoryoutputdir.

Keyword arguments:

  • name: name of the output file, excluding .md. name is also used to name all the @example blocks, and to replace @__NAME__. Defaults to the filename of inputfile.
  • preprocess, postprocess: custom pre- and post-processing functions, see the Custom pre- and post-processing section of the manual. Defaults to identity.
  • documenter: boolean that tells if the output is intended to use with Documenter.jl. Defaults to true. See the the manual section on Interaction with Documenter.
  • codefence: A Pair of opening and closing code fence. Defaults to
    "```@example $(name)" => "```"
    if documenter = true and
    "```julia" => "```"
    if documenter = false.
  • credit: boolean that controls the addition of This file was generated with Literate.jl ... to the bottom of the page. If you find Literate.jl useful then feel free to keep this to the default, which is true.
source

4.2. Notebook Output

The (default) notebook output of the source snippet can be seen here: notebook.ipynb.

We note that lines starting with # are placed in markdown cells, and the code lines have been placed in code cells. By default the notebook is also executed and output cells populated. The current working directory is set to the specified output directory the notebook is executed. Some of the output rendering can be controlled with keyword arguments to Literate.notebook:

Literate.notebook — Function.
Literate.notebook(inputfile, outputdir; kwargs...)

Generate a notebook from inputfile and write the result to outputdir.

Keyword arguments:

  • name: name of the output file, excluding .ipynb. name is also used to replace @__NAME__. Defaults to the filename of inputfile.
  • preprocess, postprocess: custom pre- and post-processing functions, see the Custom pre- and post-processing section of the manual. Defaults to identity.
  • execute: a boolean deciding if the generated notebook should also be executed or not. Defaults to true. The current working directory is set to outputdir when executing the notebook.
  • documenter: boolean that says if the source contains Documenter.jl specific things to filter out during notebook generation. Defaults to true. See the the manual section on Interaction with Documenter.
  • credit: boolean that controls the addition of This file was generated with Literate.jl ... to the bottom of the page. If you find Literate.jl useful then feel free to keep this to the default, which is true.
source

Notebook metadata

Jupyter notebook cells (both code cells and markdown cells) can contain metadata. This is enabled in Literate by the %% token, similar to Jupytext. The format is as follows

%% optional ignored text [type] {optional metadata JSON}

Cell metadata can, for example, be used for nbgrader and the reveal.js notebook extension RISE.

4.3. Script Output

The (default) script output of the source snippet above is as follows

x = 1//3

y = 2//5

z = x + y

We note that lines starting with # are removed and only the code lines have been kept. Some of the output rendering can be controlled with keyword arguments to Literate.script:

Literate.script — Function.
Literate.script(inputfile, outputdir; kwargs...)

Generate a plain script file from inputfile and write the result to outputdir.

Keyword arguments:

  • name: name of the output file, excluding .jl. name is also used to replace @__NAME__. Defaults to the filename of inputfile.
  • preprocess, postprocess: custom pre- and post-processing functions, see the Custom pre- and post-processing section of the manual. Defaults to identity.
  • documenter: boolean that says if the source contains Documenter.jl specific things to filter out during script generation. Defaults to true. See the the manual section on Interaction with Documenter.
  • keep_comments: boolean that, if set to true, keeps markdown lines as comments in the output script. Defaults to false.
  • credit: boolean that controls the addition of This file was generated with Literate.jl ... to the bottom of the page. If you find Literate.jl useful then feel free to keep this to the default, which is true.
source