How to setup the workflow of automatic documentation build for your project
----------------------------------------------------------------------------

**Setup you repository and then clone locally**::

 ssh-add your-ssh.key

 git clone ssh://<username>@gerrit.opnfv.org:29418/<project>

 cd <project>


**Inside the repository create the following structure:**::

   gerrit.opnfv.org/<project>
                        |-- docs/
                        |    |-- some-project-description.rst
                        |    |-- other-doc-1.rst
                        |    |-- images/
                        |         |-- *.png|*.jpg
                        |-- release/
                        |    |-- some-release-doc.rst
                        |    |-- images/
                        |         |-- *.png|*.jpg
                        |-- requirements/
                        |    |-- requirements.rst
                        |    |-- images/
                        |         |-- *.png|*.jpg
                        |-- design_docs/
                        |    |-- some-design-doc.rst
                        |    |-- images/
                        |         |-- *.png|*.jpg
                        |-- some_project_file.py
                        |-- some_shell_script.sh
                        |-- INFO
                        `-- README


More details about the default structure you can find `here <https://wiki.opnfv.org/documentation>`_ at paragraph "How and where to store the document content files in your repository".

**In order to obtain a nice .html & .pdf at then end you must write you documentation using reSt markup**

quick guides:

* http://docutils.sourceforge.net/docs/user/rst/quickref.html
* http://rest-sphinx-memo.readthedocs.org/en/latest/ReST.html
* http://www.math.uiuc.edu/~gfrancis/illimath/windows/aszgard_mini/movpy-2.0.0-py2.4.4/manuals/docutils/ref/rst/directives.html

An `nice online editor <http://rst.ninjs.org/>`_ that will help you write reSt and see your changes live. After done editing you can copy the source document in the repository and follow the workflow.


**Clone the releng repository so you can created jobs for JJB**::

 git clone ssh://<username>@gerrit.opnfv.org:29418/releng


Enter the project settings::

 cd releng/jjb/<project>/


**Create the verify & build scripts**

The scripts are the same for most projects and if you need customizations copy them
under your project in releng/jjb/<project>/::

 cp releng/jjb/opnfvdocs/build-docu.sh releng/jjb/<your-project>/

and change according to you needs.

If standard will suffice for you skip this step and jump to **Edit <your-project>.yml**, **Variant 1 - standard**

**docu-build.sh**:

.. code-block:: bash

 #!/bin/bash
 set -e
 set -o pipefail

 project="$(git remote -v | head -n1 | awk '{{print $2}}' | sed -e 's,.*:\(.*/\)\?,,' -e 's/\.git$//')"
 export PATH=$PATH:/usr/local/bin/

 git_sha1="$(git rev-parse HEAD)"
 docu_build_date="$(date)"

 files=()
 while read -r -d ''; do
         files+=("$REPLY")
 done < <(find * -type f -iname '*.rst' -print0)

 for file in "${{files[@]}}"; do

         file_cut="${{file%.*}}"
         gs_cp_folder="${{file_cut}}"

         # sed part
         # add one '_' at the end of each trigger variable; ex: _sha1 +'_' & _date + '_' on both of the lines below
         # they were added here without the '_'suffix to avoid sed replacement
         sed -i "s/_sha1/$git_sha1/g" $file
         sed -i "s/_date/$docu_build_date/g" $file

         # rst2html part
         echo "rst2html $file"
         rst2html --halt=2 $file | gsutil cp -L gsoutput.txt - \
         gs://artifacts.opnfv.org/"$project"/"$gs_cp_folder".html
         gsutil setmeta -h "Content-Type:text/html" \
                        -h "Cache-Control:private, max-age=0, no-transform" \
                        gs://artifacts.opnfv.org/"$project"/"$gs_cp_folder".html
         cat gsoutput.txt
         rm -f gsoutput.txt

         echo "rst2pdf $file"
         rst2pdf $file -o - | gsutil cp -L gsoutput.txt - \
         gs://artifacts.opnfv.org/"$project"/"$gs_cp_folder".pdf
         gsutil setmeta -h "Content-Type:application/pdf" \
                        -h "Cache-Control:private, max-age=0, no-transform" \
                        gs://artifacts.opnfv.org/"$project"/"$gs_cp_folder".pdf
         cat gsoutput.txt
         rm -f gsoutput.txt

 done

 images=()
 while read -r -d ''; do
         images+=("$REPLY")
 done < <(find * -type f \( -iname \*.jpg -o -iname \*.png \) -print0)

 for img in "${{images[@]}}"; do

         # uploading found images
         echo "uploading $img"
         cat "$img" | gsutil cp -L gsoutput.txt - \
         gs://artifacts.opnfv.org/"$project"/"$img"
         gsutil setmeta -h "Content-Type:image/jpeg" \
                         -h "Cache-Control:private, max-age=0, no-transform" \
                         gs://artifacts.opnfv.org/"$project"/"$img"
         cat gsoutput.txt
         rm -f gsoutput.txt

 done

 #the double {{ in file_cut="${{file%.*}}" is to escape jjb's yaml


**docu-verify.sh**:

.. code-block:: bash

 #!/bin/bash
 set -e
 set -o pipefail

 project="$(git remote -v | head -n1 | awk '{{print $2}}' | sed -e 's,.*:\(.*/\)\?,,' -e 's/\.git$//')"
 export PATH=$PATH:/usr/local/bin/

 git_sha1="$(git rev-parse HEAD)"
 docu_build_date="$(date)"

 files=()
 while read -r -d ''; do
         files+=("$REPLY")
 done < <(find * -type f -iname '*.rst' -print0)

 for file in "${{files[@]}}"; do

         file_cut="${{file%.*}}"
         gs_cp_folder="${{file_cut}}"

         # sed part
         # add one '_' at the end of each trigger variable; ex: _sha1 +'_' & _date + '_' on both of the lines below
         # they were added here without the '_'suffix to avoid sed replacement
         sed -i "s/_sha1/$git_sha1/g" $file
         sed -i "s/_date/$docu_build_date/g" $file

         # rst2html part
         echo "rst2html $file"
         rst2html --exit-status=2 $file > $file_cut".html"

         echo "rst2pdf $file"
         rst2pdf $file -o $file_cut".pdf"

 done

 #the double {{ in file_cut="${{file%.*}}" is to escape jjb's yaml


**Edit <your-project>.yml**::

 vi releng/jjb/<your-project>/<your-project>.yml


Make sure you have the job-templates set correctly as below.

example::
 vi releng/jjb/opnfvdocs/opnfvdocs.yml
 # make sure you are using one of the variants below and that !include-raw directive is present

Variant 1 - standard
---------------------

By chosing **Variant 1** you will use the scripts from opnfvdocs project.

**<your-project>.yml**::

 - job-template:
    name: 'opnfvdocs-daily-{stream}'

    node: master
    ...
    builders:
        - shell:
            !include-raw ../opnfvdocs/docu-build.sh

 - job-template:
    name: 'opnfvdocs-verify'

    node: master
    ...
    builders:
        - shell:
            !include-raw ../opnfvdocs/docu-verify.sh

 - job-template:
    name: 'opnfvdocs-merge'

    node: master
    ...
    builders:
        - shell:
            !include-raw ../opnfvdocs/docu-build.sh


Variant 2 - custom
-------------------

**<your-project>.yml**::

 - job-template:
    name: 'opnfvdocs-daily-{stream}'

    node: master
    ...
    builders:
        - shell:
            !include-raw docu-build.sh

 - job-template:
    name: 'opnfvdocs-verify'

    node: master
    ...
    builders:
        - shell:
            !include-raw docu-verify.sh

 - job-template:
    name: 'opnfvdocs-merge'

    node: master
    ...
    builders:
        - shell:
            !include-raw docu-build.sh


"node: master" is important here as all documentations are built on Jenkins master node for now.

Please reffer to the releng repository for the correct indentation as JJB is very picky
with those and also for the rest of the code that is missing in the example code and replaced by "...".
Also you must have your documentation under docs/ in the repository or gsutil will fail to copy them;
for customizations you might need to addapt build-docu.sh as we did for genesis project
as different documents need to go into different places.


Stage files example::

 git add docu-build.sh docu-verify.sh <project>.yml


Commit change with --signoff::

 git commit --signoff


Send code for review in Gerrit::

 git review -v


Create the documentation using the recommended structure in your repository and submit to gerrit for review


**Jenkins will take over and produce artifacts in the form of .html & .pdf**

Jenkins has the proper packages installed in order to produce the artifacts.


**Artifacts are stored on Google Storage (still to decide where, structure and how to present them)**

http://artifacts.opnfv.org/


`Here you can download the PDF version <http://artifacts.opnfv.org/opnfvdocs/docs/enable_docu_gen.pdf>`_ of this guide.


**Scrape content from html artifacts on wiki**

This section describes how the html build artifacts can be made visible on Wiki using he scrape method.
DokuWiki speeds up browsing through the wiki by caching parsed files1).
If a currently cached version of a document exists, this cached copy is delivered
instead of parsing the data again. On editing and previewing no cache is used.

To prevent a page from ever being cached, use the NOCACHE tag anywhere in the document.
This is useful if the page contains dynamic content, e.g. PHP code that pulls in outside information,
where the caching would prevent the most recent information from being displayed.
Same applies if documentation artifacts are rebuilt the cached version is shown
if the NOCACHE tag is not used.

https://www.dokuwiki.org/caching

In order to have you documentation on Wiki you need to create a wiki page and include an adaption of the code below:

example::

 ~~NOCACHE~~

 {{scrape>http://artifacts.opnfv.org/opnfvdocs/docs/enable_docu_gen.html}}


Please try to write documentation as accurate and clear as possible as once reviewed and
merged it will be automatically built and displayed on Wiki and
everyone would apreciate a good written/nice looking guide.

If you want to see on wiki what code is scraped from the built artifacts click "Show pagesource" in the right
(it will appear if you hover over the magnifier icon);
this way you know what is written straight on wiki and what is embedded with "scrape".
By knowing these details you will be able to prevent damages by manually updating wiki.


**Wiki update - how it works**

Edit Wiki page https://wiki.opnfv.org/<page> and look for {{scrape>http://artifacts.opnfv.org/<project>/<folder>/<doc-file>.html}}
Click "Preview" and see if the change you submitted to Git is present;
add a short description in "Edit summary" field, then click "Save" to update the page.
This extra step is needed as Wiki does not auto update content for now.


**How to track documentation**

You must include at the bottom of every document that you want to track the following::

 **Documentation tracking**

 Revision: _sha1_

 Build date:  _date_

**Image inclusion for artifacts**

Create a folder called images in the same folder where you documentation resides and copy .jpg or .png files there, according to the guide here: https://wiki.opnfv.org/documentation

Here is an example of what you need to include in the .rst files to include an image::

 .. image:: images/smiley.png
    :height: 200
    :width: 200
    :alt: Just a smiley face!
    :align: left

The image will be shown in both .html and .pdf resulting artifacts.


NOTE:
------

In order to generate html & pdf documentation the needed packages are rst2pdf & python-docutils
if the Jenkins is CentOS/RHEL; many variants have been tested but this is the cleanest solution found.
For html generation it also supports css styles if needed.


**Documentation tracking**

Revision: _sha1_

Build date:  _date_