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Take the power of Jinja2 templates to OpenOffice and LibreOffice and create reports and letters in your web applications

Project description


#### Take the power of Jinja2 templates to OpenOffice and LibreOffice and create reports in your web applications.

**Secretary** allows you to use Open Document Text (ODT) files as templates for rendering reports or letters. Secretary is an alternative solution for creating office documents and reports in OpenDocument Text format from templates that can be visually composed using the Writer word processor.

Secretary use [the semantics of jinja2 templates][1] to render ODT files. Most features in jinja can be used into your ODT templates including variable printing, filters and flow control.

Rendered documents are produced in ODT format, and can then be converted to PDF, MS Word or other supported formats using the UNO Bridge or a library like [PyODConverter][2]

## Installing

pip install secretary

## Rendering a Template

from secreatary import Render

engine = Renderer()
result = engine.render(template, foo=foo, bar=bar)

Secretary implements a class called `Renderer`. `Renderer` takes a single argument called `environment` which is a jinja **[Environment][3]**.

To render a template create an instance of class `Renderer` and call the instance's method `render` passing a template file and template's variables as keyword arguments. `template` can be a filename or a file object. `render` will return the rendered document in binary format.

Before rendering a template, you can configure the internal templating engine using the `Renderer` instance's variable `environment`, which is an instance of jinja2 **[Environment][3]** class. For example, to declare a custom filter use:

from secreatary import Renderer

engine = Renderer()

# Configure custom application filters
engine.environment.filters['custom_filer'] = filter_function
result = engine.render(template, foo=foo, bar=bar)

output = open('rendered_document.odt', 'wb')

## Composing Templates

Secretary templates are simple ODT documents. You can create them using Writer. An OpenDocument file is basically a ZIP archive containing some XML files. If you plan to use control flow or conditionals it is a good idea to familiarise yourself a little bit with the OpenDocument XML to understand better what's going on behind the scenes.

### Printing Variables

Since Secretary use the same template syntax of Jinja2, to print a varible type a double curly braces enclosing the variable, like so:

{{ }}
{{ foo['bar'] }}

However, mixing template instructions and normal text into the template document may become confusing and clutter the layout and most important, in most cases will produce invalid ODT documents. Secretary recommends using an alternative way of inserting fields. Insert a visual field in LibreOffice Writer from the menu `Insert` > `Fields` > `Other...` (or just press `Ctrl+F2`), then click on the `Functions` tab and select `Input field`. Click `Insert`. A dialog will appear where you can insert the print instructions. You can even insert simple control flow tags to dynamically change what is printed in the field.

Secretary will handle multiline variable values replacing the line breaks with a `<text:line-break/>` tag.

### Control Flow

Most of the time secretary will handle the internal composing of XML when you insert control flow tags (`{% for foo in foos %}`, `{% if bar %}`, etc and its enclosing tags. This is done by finding the present or absence of other secretary tags within the internal XML tree.

#### Examples document structures
**Printing multiple records in a table**
``` plain
| {% for record in records %} |
| {{ }} | {{ }} |
| {% endfor %} |
**Conditional paragraphs**
> `{% if already_paid %}`
> `{% else %}`
> `{% endif %}`

The last example could had been simplified into a single paragraph in Writer like:

> `{% if already_paid %}`YOU ALREADY PAID`{% else %}`YOU HAVEN'T PAID`{% endif %}`

**Printing a list of names**

> * `{% for name in names %}`
> * `{{ name }}`
> * `{* endfor %}`

Automatic control flow in Secretary will handle the intuitive result of the above examples and similar thereof.

Although most of the time the automatic handling of control flow in secretary may be good enough, we still provide an additional method for manual control of the flow. Use the `reference` property of the field to specify where where the control flow tag will be used or internally moved within the XML document:

* `paragraph`: Whole paragraph containing the field will be replaced with the field content.
* `before::paragraph`: Field content will be moved before the current paragraph.
* `after::paragraph`: Field content will be moved after the current paragraph.
* `row`: The entire table row containing the field will be replace with the field content.
* `before::row`: Field content will be moved before the current table row.
* `after::row`: Field content will be moved after the current table row.
* `cell`: The entire table cell will be replaced with the current field content. Even though this setting is available, it is not recommended. Generated documents may not be what you expected.
* `before::cell`: Same as `before::row` but for a table cell.
* `after::cell`: Same as `after::row` but for a table cell.
> Field content is the control flow tag you insert with the Writer *input field*

### Features of jinja2 not supported
Secretary supports most of the jinja2 control structure/flow tags. But please avoid using the following tags since they are not supported: `block`, `extends`, `macro`, `call`, `include` and `import`.

### Builtin Filters
Secretary includes some predefined *jinja2* filters. Included filters are:

- **markdown(value)**
Convert the value, a markdown formated string, into a ODT formated text. Example:

{{ invoice.description|markdown }}

- **pad(value, length)**
Pad zeroes to `value` to the left until output value's length be equal to `length`. Default length if 5. Example:

{{ invoice.number|pad(6) }}


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