Unlike inja lib, you have to build Jinja2Cpp, but it has only one dependence: boost. Of course, you can write this producer in the way like this. It's too complicated for writing 'from scratch'. Actually, there is a better and simpler way.
These placeholders will be replaced with the actual text during template rendering process. In order to this happen, you should fill up the rendering parameters. This is a simple dictionary which maps the parameter name to the corresponding value:. You can call 'Render' method many times, with different parameters set, from several threads.
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Everything will be fine: every time you call 'Render' you will get the result depended only on provided params. Also you can render some part of template many times for different parameters with help of 'for' loop and 'extend' statement described below. It allows you to iterate through the list of items from the first to the last one and render the loop body for each item respectively. In this particular sample it allows to put as many 'case' blocks in conversion function as many items in the 'reflected' enum.
Let's imagine you don't want to fill the enum descriptor by hand, but want to fill it with help of some code parsing tool autoprogrammer or cppast.
In this case you can define structure like this:. This structure holds the enum name, enum namespace scope prefix, and list of enum items we need just names. Then, you can populate instances of this descriptor automatically using chosen tool ex.
For our sample we can create the instance manually:. And now you need to transfer data from this internal enum descriptor to Jinja2 value params map. Of course it's possible to do it by hands:. But actually, with Jinja2Cpp you don't have to do it manually.
Library can do it for you.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.
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Mar 9, Jan 12, Reduced overhead of escaping special characters in json serializer Jan 22, Jan 4, Support for "default" attribute for the "attr" and "map" filters to r…. Jun 17, Release 1. Oct 1, GitHub actions as an additional CI Oct 7, Debug windows GA CI. Mar 8, Initial commit. Apr 20, Mar 4, Jan 10, Lookup plugins allow Ansible to access data from outside sources. This can include reading the filesystem in addition to contacting external datastores and services.
The data returned by a lookup plugin is made available using the standard templating system in Ansible, and are typically used to load variables or templates with information from those systems. Lookup plugins can be used anywhere you can use templating in Ansible: in a play, in variables file, or in a Jinja2 template for the template module.
Lookups are an integral part of loops. You can combine lookups with FiltersTests and even each other to do some complex data generation and manipulation. For example:. You can now control how errors behave in all lookup plugins by setting errors to ignorewarnor strict.
The default setting is strictwhich causes the task to fail. In Ansible 2. The difference between lookup and query is largely that query will always return a list.
The default behavior of lookup is to return a string of comma separated values. This was done primarily to provide an easier and more consistent interface for interacting with the new loop keyword, while maintaining backwards compatibility with other uses of lookup.
Additionally, q was introduced as a shortform of query :. You can use ansible-doc -t lookup -l to see the list of available plugins. Ansible 2. Note Lookups are executed with a working directory relative to the role or play, as opposed to local tasks, which are executed relative the executed script.
Since Ansible version 1. Lookup plugins are an advanced feature; to best leverage them you should have a good working knowledge of how to use Ansible plays. Warning Some lookups pass arguments to a shell. Stop by the google group!GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
Already on GitHub? Sign in to your account. Trying to use the filter: selectattr 'name','equalto',item. Name: Jinja2 Version: 2.
Found this example on Stackoverflow Since versions may clash updated system:. If these files are inaccurate, please update the component name section of the description or use the! IIRC equalto was added in Jinja2 2. Can you run the following commands on the controller the machine your run ansible from to see what the output is? A few related issues, The linked issues above all suggest upgrading jinja2 via pip, which I did before opening this issue.
Pip installed version 2. Since I did not change any ansible configs, I guess my question is, what do I need to do that this newer version gets picked up?
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Copy link Quote reply. This comment has been minimized.Get an attribute of an object.
See Notes on subscriptions for more details. A filter that batches items. It works pretty much like slice just the other way round. It returns a list of lists with the given number of items. If you provide a second parameter this is used to fill up missing items. See this example:. If the value is undefined it will return the passed default value, otherwise the value of the variable:. If you want to use default with variables that evaluate to false you have to set the second parameter to true :.
Sort a dict and yield key, value pairs. Because python dicts are unsorted you may want to use this function to order them by either key or value:. Use this if you need to display text that might contain such characters in HTML. Marks return value as markup string. Per default decimal prefixes are used Mega, Giga, etc. Convert the value into a floating point number. You can override this default using the first parameter. Changed in version 2. Return a copy of the passed string, each line indented by 4 spaces.
The first line is not indented. If you want to change the number of spaces or indent the first line too you can pass additional parameters to the filter:.
Convert the value into an integer. Return a string which is the concatenation of the strings in the sequence. The separator between elements is an empty string per default, you can define it with the optional parameter:. Convert the value into a list. If it was a string the returned list will be a list of characters. Applies a filter on a sequence of objects or looks up an attribute.
This is useful when dealing with lists of objects but you are really only interested in a certain value of it. The basic usage is mapping on an attribute. Imagine you have a list of users but you are only interested in a list of usernames:.
Alternatively you can let it invoke a filter by passing the name of the filter and the arguments afterwards. A good example would be applying a text conversion filter on a sequence:. With Jinja 1. If this parameter is truthy the output will be more verbose this requires pretty.Navigation index modules Jinja Documentation 2.
Navigation Overview Quick search. Created using Sphinx 2. Undefined attribute. Environment method And class in jinja2. Expr method. Assign class in jinja2. Extension method autoescape jinja2. EvalContext attribute. BaseLoader class in jinja2 batch built-in function BinExpr class in jinja2.
Context attribute jinja2. Template attribute. Bucket method BytecodeCache class in jinja2. Call class in jinja2. SandboxedEnvironment method callable built-in function CallBlock class in jinja2. Expr method capitalize built-in function center built-in function ChainableUndefined class in jinja2 ChoiceLoader class in jinja2 clear jinja2.
Environment attribute. Compare class in jinja2.
Jinja2 equalto() Test
Environment method Concat class in jinja2. Environment attribute contextfilter in module jinja2 contextfunction in module jinja2 ContextReference class in jinja2. TokenStream attribute current cycler property cycler built-in class. SandboxedEnvironment attribute defined built-in function DerivedContextReference class in jinja2. TemplateStream method Div class in jinja2. BytecodeCache method. TemplateStream method Environment class in jinja2 environment jinja2.
Bucket attribute jinja2. Context attribute EnvironmentAttribute class in jinja2. TokenStream property eq built-in function escape built-in function in module jinja2 jinja2. Context attribute. EvalContext class in jinja2.
Context attribute Expr class in jinja2. Environment method Extends class in jinja2. Environment method. Parser method false built-in function filename jinja2. Parser attribute jinja2. Template attribute jinja2. Extension method FilterBlock class in jinja2. Environment attribute find jinja2. Node method.Filters in Ansible are from Jinja2, and are used for transforming data inside a template expression.
Jinja2 ships with many filters.
See builtin filters in the official Jinja2 template documentation. In addition the ones provided by Jinja2, Ansible ships with its own and allows users to add their own custom filters. The following filters will take a data structure in a template and render it in a slightly different format. These are occasionally useful for debugging:.
That causes unexpected line break after 80th symbol if there is a space after 80th symbol To avoid such behaviour and generate long lines it is possible to use width option:. Note that it also supports passing through other YAML parameters. The default behavior from ansible and ansible.
The variable value will be used as is, but the template evaluation will raise an error if it is undefined. If you want to use the default value when variables evaluate to false or an empty string you have to set the second parameter to true :. As of Ansible 1.
In this example, the default None Python null value will cause the later filters to fail, which will trigger the or omit portion of the logic. This filter turns a list of dicts with 2 keys, into a dict, mapping the values of those keys into key: value pairs:. This is the reverse of the dict2items filter.
To get a list combining the elements of other lists use zip :. Similarly to the output of the items2dict filter mentioned above, these filters can be used to construct a dict :. Produces a product of an object, and subelement values of that object, similar to the subelements lookup:. An example of using this filter with loop :. As of Ansible version 2. This way, you can create random-but-idempotent MAC addresses:. This filter can be used similar to the default jinja2 random filter returning a random item from a sequence of itemsbut can also generate a random number based on a range.
This way, you can create random-but-idempotent numbers:.
All you need is a seed. Sometimes you end up with a complex data structure in JSON format and you need to extract only a small set of data within it. This filter is built upon jmespathand you can use the same syntax.
For examples, see jmespath examples. Here, quoting literals using backticks avoids escaping quotes and maintains readability. Or, using YAML single quote escaping :. Escaping single quotes within single quotes in YAML is done by doubling the single quote.
IP address filter can also be used to extract specific information from an IP address. More information about ipaddr filter and complete usage guide can be found in ipaddr filter. The spec file should be valid formatted YAML. Below is an example of a valid spec file that will parse the output from the show vlan command.