speed-of-light/gist:27875daf0eb46f629d84

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    Variables

predefined variables :

inventory_hostname (fqdn) (normally the same as ansible.fqdn)
inventory_hostname_short

To know the return codes returned by ansible modules, just use plain ansible -vvv to see them :
ansible -i ~/ansible/arrfab.net/hosts/hosts.cfg -vvv -m copy -a 'src=files/sysinfo dest=/etc/sysinfo' tungstene.arrfab.net
tungstene.arrfab.net | success >> {
"changed": true,
"daisychain_args": "src=files/sysinfo dest=/etc/sysinfo src=/var/tmp/ansible-1351514206.18-224994873189361/sysinfo",
"dest": "/etc/sysinfo",
"group": "root",
"md5sum": "e5e0af8c573543d6beb837ce2ef3e019",
"mode": "0644",
"owner": "root",
"path": "/etc/sysinfo",
"secontext": "root:object_r:etc_t",
"src": "/var/tmp/ansible-1351514206.18-224994873189361/sysinfo",
"state": "file"
}
so you know you can use ${status.changed} as a variable for logging/mails, etc...
example :
action: template ...
register: mytemplate
action: blablah
only_if: '${mytemplate.changed}'   #other way of saying only_if: "'${mytemplate.changed}' == 'True'"

If your variables is a list containing one iteam on each line , you can use
register: users
and used ${users.stdout_lines}
only_if

Test if a variable is defined
only_if: "is_set('${ansible_default_ipv4.gateway}')"
String comparison
only_if: "'$declared_user' == 'arrfab'"
Misc
only_if: "'$ansible_distribution_version'.startswith('5.')"
only_if: "'${blah}' == 'blah' or '${blah}' == 'otherblah'"
only_if: "'${blah}' in ('blah', 'otherblah')"
Templates

You can just use variables in jinja2 templates like this : ${my_variable} (attention, variables can't contain . as in my.variable !
Some default variables can be used, like {{ ansible_managed }}, $template_host, $template_uid and $template_path
a for loop :
{% for a in name_of_your_list %}
blabla
{ %endfor %}(name of your list being defined somewhere else in the vars section like name_of_your_list: [one,two,three]
{% if 'webserver' in group_names %}
some part of a configuration file that only applies to webservers

{% endif %}
{% for host in groups['app_servers'] %}
something that applies to all app servers.

{{ hostvars[host].ansible_eth0.ipv4.address }}
{% endfor %}
resolv.in by {{ name | upper }}

for  {{ ansible_eth0.ipv4.address }}

{% if domain is defined -%}
domain {{ domain }}
{% endif -%}
{% for ns in resolvers -%}
nameserver {{ ns }}
{% endfor %}
{% if is_cluster_member == True %}
This machine is member of a cluster
{% else %}
{% endif %}
Using nesting variables: trying to show ansible_eth0.macaddress, but eth0 itself being a variable defined in the playbook or vars_prompt (user_interface)
user interface: {{ user_interface }}
{% set iface = 'ansible_' + user_interface %}
show: iface = {{ iface }}
show: inventory_hostname = {{ inventory_hostname }}
{% set ifacedata = hostvars[inventory_hostname][iface] %}
mac address of {{ iface }} is {{ ifacedata.macaddress }}