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==============================
Tutorial for creating a plugin
==============================
Introduction: what is a plugin, and what this tuto will be about ?
============================================================
The QP is split into two kinds of routines/global variables (i.e. providers):
i) the core modules locatedin qp2/src/, which contains all the bulk of a quantum chemistry software (integrals, matrix elements between Slater determinants, linear algebra routines, DFT stuffs etc..)
ii) the plugins which are external stuffs connected to the qp2/src/ stuffs.
More precisely, a plugin of the QP is a directory where you can create routines,
providers and executables that use all the global variables/functions/routines already created
in the modules ofqp2/src or in other plugins.
Instead of giving a theoretical lecture on what is a plugin,
we will go through a series of examples that allow you to do the following thing:
I) print out one- and two-electron integrals on the AO/MO basis,
creates two providers which manipulate these objects,
print out these providers,
II) browse the Slater determinants stored in the EZFIO wave function and compute their matrix elements,
III) build the Hamiltonian matrix and diagonalize it either with Lapck or Davidson,
IV) print out the one- and two-electron rdms,
V) obtain the AOs and MOs on the DFT grid, together with the density,
This tuto is as follows:
i) you READ THIS FILE UNTIL THE END in order to get the big picture and vocabulary,
ii) you go to the directory qp2/plugins/tuto_plugins/ and you will find detailed tuto there for each of the 5 examples.
Creating a plugin: the basic
----------------------------
The first thing to do is to be in the QPSH mode: you execute the qp2/bin/qpsh script that essentially loads all
the environement variables and allows for the completion of command lines in bash (that is an AMAZING feature :)
Then, you need to known where you want to create your plugin, and what is the name of the plugin.
!!!! WARINING: The plugins are NECESSARILY located in qp2/plugins/ !!!!
Ex: If you want to create a plugin named "my_fancy_plugin" in the directory plugins/plugins_test/,
this goes with the command
qp plugins create -n my_fancy_plugin -r plugins_test/
Then, to create plugin of your dreams, the two questions you need to answer are the following:
a) What do I need to compute what I want, which means what are the objects that I need ?
There are two kind of objects:
+ the routines/functions
Ex: Linear algebra routines, integration routines etc ...
+ the global variables which are called the PROVIDERS
Ex: one-electron integrals, Slater determinants, density matrices etc ...
b) Where do I find these objects ?
The objects (routines/functions/providers) are necessarily created in other modules/plugins
Ex: the routine "lapack_diagd" (which diagonalises a real hermitian matrix) is located in the file
qp2/src/utils/linear_algebra.irp.f
therefore it "belongs" to the module "utils"
: the routine "ao_to_mo" (which converts a given matrix A from the AO basis to the MO basis) is located in the file
qp2/src/mo_one_e_ints/ao_to_mo.irp.f
therefore it "belongs" to the module "mo_one_e_ints"
: the provider "ao_one_e_integrals" (which is the integrals of one-body part of H on the AO basis) is located in the file
qp2/src/mo_one_e_ints/ao_to_mo.irp.f
therefore it belongs to the module "mo_one_e_ints"
: the provider "one_e_dm_mo_beta_average" (which is the state average beta density matrix on the MO basis) is located in the file
qp2/src/determinants/density_matrix.irp.f
therefore it belongs to the module "determinants"
To import all the variables that you need, you just need to write the name of the plugins in the file "NEED"
Ex: to import all the variables/routines of the module "utils", "determinants" and "mo_one_e_ints" you will have the following NEED file:
utils
determinants
mo_one_e_ints
TIPS
----
There are many many routines/providers in the core modules of QP. Nevertheless, as everything is coded with the IRPF90, you can use the following amazing tools: irpman
irpman can be used in command line in bash to obtain all the info on a routine or variable !
Ex: execute the following command line :
irpman ao_one_e_integrals
Then it appears all the information you want on ao_one_e_integrals, including where it is created, the type, dimension if it is an array, what providers it needs to be built, and what providers need this provider.

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program my_program_to_print_stuffs
implicit none
BEGIN_DOC
! TODO : Put the documentation of the program here
END_DOC
integer :: i,j
print*,'AO integrals '
do i = 1, ao_num
do j = 1, ao_num
print*,j,i,ao_one_e_integrals(j,i)
enddo
enddo
print*,'MO integrals '
do i = 1, mo_num
do j = 1, mo_num
print*,j,i,mo_one_e_integrals(j,i)
enddo
enddo
end

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======================================
Tutorial for plugin I: One-e integrals
======================================
!!! Requirements:
a) you know how to create an EZFIO file and run calculations with QP
(check the tuto: `<https://quantumpackage.github.io/qp2/post/hartree-fock/>`),
b) you have an EZFIO file in the sto-3g from the file H2.xyz in plugins/tuto_plugins,
and you have run an HF calculation giving an energy of -1.116759 a.u.,
c) you made an qp set_file YOUR_EZFIO_FILE_FOR_H2 in order to be,
d) you have READ the ../README.rst file to HAVE THE VOCABULARY.
Our goals:
----------
We want to create a plugin to do the following things:
a) print out one- and two-electron integrals on the AO/MO basis,
b) creates two providers which manipulate these objects,
c) print out these providers,
I) Starting: creating the plugin
--------------------------------
We will go step-by-step through these plugins.
The name of the plugin will be "plugin_I", and its location is in "tuto_plugins".
Therefore to create the plugin, we do
$ qp plugins create -n plugin_I -r tuto_plugins
Then to an "ls" in qp2/plugins/tuto_plugins/
and you will find a directory called "plugin_I".
In that directory you will find:
i) a "NEED" file that will eventually contain all the other modules/plugins needed by our "plugin_I"
ii) a "README.rst" file that you can AND SHOULD modify in order to document what is doing the plugin.
iii) a "plugin_I.irp.f" file that is a program to be compiled and just printing "Hello world"
II) Specifying the dependencies
-------------------------------
The next step is to know what are the other modules/plugins that we need to do what we want.
We need here
a) the one-electron integrals on the AO basis, which are computed in qp2/src/ao_one_e_ints/
b) the one-electron integrals on the MO basis, which are computed in qp2/src/mo_one_e_ints/
c) the two-electron integrals on the AO basis, which are computed in qp2/src/ao_two_e_ints/
d) the two-electron integrals on the MO basis, which are computed in qp2/src/mo_two_e_ints/
Therefore, we will need the following four modules:
a) ao_one_e_ints
b) mo_one_e_ints
c) ao_two_e_ints
d) mo_two_e_ints
You can then create the following "NEED" file by executing the following command
$ cat <<EOF > NEED
ao_one_e_ints
mo_one_e_ints
ao_two_e_ints
mo_two_e_ints
EOF
II) Installing the plugin
-------------------------
Now that we have specified the various depenencies we need now to INSTALL the plugin, which means to create the equivalent of a Makefile for the compilation.
To do it we simply do
$ qp plugins install plugin_I
III) Compiling the void plugin
------------------------------
It is customary to compile first your "void" plugin, void in the sense that it does not contain anything else than the program printing "Hello world".
To do so, just go in the plugin and execute the following command
$ ninja
It does a lot of stuffs, but it must conclude with something like
"
make: Leaving directory 'SOME_PATH_TOWARD_YOUR_QP2_DIRECTORY/qp2/ocaml'
"
Since that it has compiled, an executable "plugin_I" has been created.
Also, if you make "ls" in the "plugin_I" you will notice that many symbolink links have been created, and among which the four modules that you included in the NEED file.
All the other modules (Ex:"ao_basis", "utils") are here because they are need by some of the four modules that you need.
The variables that we need are
ao_one_e_integrals
mo_one_e_integrals
You can check them with
irpman ao_one_e_integral
irpman mo_one_e_integral
in order to get some information on where they are created, and many more information.
We will modify the executable such that it prints out the integrals.
IV) Printing out the one-electron integrals
--------------------------------------------
We will create a program that will print out the one-electron integrals on the AO and MO basis.
You can then copy the file "print_one_e_h.irp.f" in your plugin.
In the file you will see that we simply browse the two arrays "ao_one_e_integrals" and "mo_one_e_integrals", which are global variables (providers) and we browse them until either "ao_num" or "mo_num" which are also providers representing the number of AOs or MOs.
You can check these variables with irpman !
If you recompile using "ninja" as before, and another executable has been created "print_one_e_h".
Then, you can run the program on the ezfio file by doing
qp run print_one_e_h
and will print out the data you need :)