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# documentation.org -- Pamhyr developers documentation
# Copyright (C) 2023  INRAE
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# -*- coding: utf-8 -*-

#+STARTUP: indent

#+INCLUDE: ../tools/macro.org
#+INCLUDE: ../tools/latex.org

#+TITLE: Developers documentation
#+SUBTITLE: Version: {{{version}}}
#+AUTHOR: {{{INRAE}}}

#+OPTIONS: toc:t
#+LANGUAGE: UKenglish

#+BEGIN_abstract
This document is for the use of developers. It describes the project
architecture, the tools available to assist development and
debugging. It also describes the procedures for creating packages and
the configurations required to set up the gitlab runners. Finally,
this document explains how documentation is written and modified, and
how to contribute to the project by modifying, improving or adding
documentation, translations or code.
#+END_abstract

* Introduction

Pamhyr2 is free and open source software (FOSS) graphical user
interface (GUI) for 1D hydro-sedimentary modelling of rivers developed
in Python (with version 3.8). It use PyQt at version 5 and matplotlib
in version 3.4.1 or later for the user insterface (see
{{{file(/requirements.txt)}}} for details). The architecture of
project code follow the Qt Model/View architecture [fn:qt-arch] (see
details in section [[Architecture]]). Pamhyr2 packages can be build
manually (see section [[Building packages]]), but there are automatically
build with the gitlab-ci (see the section [[Setup the CI
environment]]). Documentation files are written with org-mode[fn:org],
let see section [[Documentation files]]. Finally, to see the contribution
rules, see the section [[How to contribute?]].

[fn:qt-arch] Qt Model/View documentation:
https://doc.qt.io/qt-5/model-view-programming.html (last access
2023-09-15)
[fn:org] The org-mode website: https://orgmode.org/ (last access
2023-09-15)

* TODO Architecture
** TODO Model
** TODO Solver
** TODO View
** TODO Unit tests
** TODO The debug mode
* TODO Build the project

The project uses gitlab-ci runners to build packages, but it is possible
to build packages manually.

** Building packages

If you need an hand made package, you can script available in
{{{file(packages)}}} directory.

*** GNU/Linux

On GNU/Linux building GNU/Linux packages is easy, you just need python
in version 3.8 must be installed with venv and pyinstaller packages
(see Listing [[linux-env-deb]] for Debian and derived system). Finally,
run the {{{file(linux.sh)}}} script (see Listing [[linux-pkg]]).

#+NAME: linux-env-deb
#+CAPTION: Install environment on GNU/Linux
#+begin_src shell
sudo apt install python3.8
python3 -m pip install venv
python3 -m pip install pyinstaller
#+end_src

#+NAME: linux-pkg
#+CAPTION: Build GNU/Linux package
#+begin_src shell
cd packages
./linux.sh
#+end_src

*** Windows

To make the Windows packages you have two choice: If you use Windows
you can use the script {{{file(packages/windows.bat)}}}, other else
you can use the script {{{file(packages/wine.sh)}}}. Each script need
a specific software environment.

On windows, you needs python on version 3.8, pyinstaller and
NSIS[fn:nsis] installed. On GNU/Linux you need wget, wine and
winetricks installed.

[fn:nsis] The NSIS web site: https://sourceforge.net/projects/nsis/

** TODO Setup the CI environment
* Documentation files

This document and the user documentation are org files. This text file
format is formatted so that it can be exported in different formats:
PDF (with latex), ODT, HTML, etc. It was originally designed for the
GNUEmacs[fn:emacs] text editor, but can be edited with any text editor. Here we
take a look at the different features used in these documents.

[fn:org] The org-mode website: https://orgmode.org/ (last access
2023-09-15)
[fn:emacs] The GNUEmacs project website: https://gnu.org/s/emacs/
(last access 2023-09-15)

** Org-mode
*** Document structure

Org uses the =*= character to define a new document section. To add a
sub-section, you can add an additional =*= to the current section[fn::
See document structure documentation:
https://orgmode.org/org.html#Headlines (last access 2023-09-15)].

#+BEGIN_EXAMPLE
 * Top level headline
 ** Second level
 *** Third level
     some text
 *** Third level
     more text
 * Another top level headline
#+END_EXAMPLE

*** Format

Org-mode is a markup file, using markup in the text to modify the
appearance of a portion of text[fn:: See markup documentation:
https://orgmode.org/org.html#Emphasis-and-Monospace (last access
2023-09-15)].

| Markup             | Results          |
|--------------------+------------------|
| =*Bolt*=           | *Bolt*           |
| =/Italic/=         | /Italic/         |
| =_underline_=      | _underline_      |
| ==verbatim==       | =verbatim=       |
| =~code~=           | ~code~           |
| =+strike-through+= | +strike-through+ |

*** Source code blocks

You can add some code blocks[fn:: See org-mode documentation for
source code: https://orgmode.org/org.html#Working-with-Source-Code
(last access 2023-09-15)] in the document.

Here is an example for python source code:
#+BEGIN_EXAMPLE
#+CAPTION: Get os type name in Python code
#+begin_src python
import os

print(f"Document build on system: {os.name}")
#+end_src
#+END_EXAMPLE

If you use GNUEmacs, it is also possible to run the code inside a
block and export (or not) the reuslts in the document.

#+OPTIONS: float:nil
#+CAPTION: Get os type name in Python code
#+begin_src python :python python3 :results output :exports both :noweb yes
import os

print(f"Document build on system: {os.name}")
#+end_src

#+RESULTS:
: Document build on system: posix

*** Latex

If we export the file to PDF, org-mode use {{{latex}}}. So we can add
some piece of {{{latex}}} into the document[fn:: See {{{latex}}} part
in documentation: https://orgmode.org/org.html#Embedded-LaTeX (last
access 2023-09-15)]. For exemple, we can add math formula like
=$E=mc^2$= ($E=mc^2$) or =\[E=mc^2\]=:

\[E=mc^2\]

But we can also add every type of {{{latex}}}:

#+BEGIN_EXAMPLE
# Add latex in line
#+LATEX: <my line of latex>

# Add multiple line of LaTeX
#+BEGIN_EXPORT latex
<my latex here>
#+END_EXPORT
#+END_EXAMPLE

It is also possible to add specific {{{latex}}} file header with
=#+LATEX_HEADER=. In this document we use the file
{{{file(doc/tools/latex.org)}}} for all {{{latex}}} headers.

*** Macro

In this document, we use a few macros[fn:: See marcos documentation
https://orgmode.org/org.html#Macro-Replacement (last access
2023-09-15)] to simplify writing. They allow you to define sequences
of text to be replaced, so that the macro name is replaced by its
value. They are defined in the {{{file(doc/tools/macro.org)}}}
file. Once defined, they can be used in the document as follows:
={{{<macro-name>}}}=. You can also have macros with arguments, in this
case: ={{{<macro-name>(arg1,...)}}}=. Les macros peuvent aussi
utiliser du code emacs-lisp.

#+BEGIN_EXAMPLE
# Exemple of macro définition

#+MACRO: toto               tata
#+MACRO: add                \(($1 + $2)\)
#+MACRO: emacs-version      (eval (nth 2 (split-string (emacs-version))))
#+END_EXAMPLE

#+MACRO: toto               tata
#+MACRO: add                \(($1 + $2)\)
#+MACRO: emacs-version      (eval (nth 2 (split-string (emacs-version))))

Macro apply:
- Marco ={{{toto}}}=: {{{toto}}}
- Marco ={{{add(x,y)}}}=: {{{add(x,y)}}}
- Marco ={{{emacs-version}}}=: {{{emacs-version}}}

*** Footnotes

Footnote in org-mode is define with marker =[fn:...]=[fn:: Create
footnotes in org-mode documentation
https://orgmode.org/org.html#Creating-Footnotes (last access
2023-09-15)]:
#+BEGIN_EXAMPLE
The Org website[fn:1] now looks a lot better than it used to.
...
[fn:1] The link is: https://orgmode.org
#+END_EXAMPLE
or:
#+BEGIN_EXAMPLE
The Org website[fn:: The link is: https://orgmode.org] now looks
a lot better than it used to.
...
#+END_EXAMPLE

*** References

The references use the {{{latex}}} bibtex tools. The bib file is in
{{{file(/doc/tools/ref.bib)}}} and use for developers and user
documentation. In document, use ={{{cite(<name>)}}}= to cite a paper.

** Export

To export the files, a {{{file(build.sh)}}} script is available in the org
files directories. On GNU/Linux system you can build the documentation
PDF file with the command =./build.sh=. Texlive package must be
installed, you can install only needed packages or all texlive
packages, for example on Debian (and some derived system) use command
Listing [[texlive-install]].

#+NAME: texlive-install
#+CAPTION: Installation command for texlive full on Debian system
#+begin_src shell
  sudo apt install texlive-full
#+end_src

 Some org-mode configuration used in documentations files are define
in =/doc/tools/=:
- {{{file(PamhyrDoc.cls)}}}: The {{{latex}}} document class
- {{{file(macro.org)}}}: Available macro
- {{{file(latex.org)}}}: {{{latex}}} configutation for documentations
  files
- {{{file(setup.el)}}}: GNUEmacs configuration to build documentations
- {{{file(ref.bib)}}}: Bibtex files for documentations files

* TODO How to contribute?
** TODO Contribution rules
** TODO Translate
** TODO Code contribution

{{{biblio}}}