#+TITLE: Building tools
#+STARTUP: indent overview
#+PROPERTY: header-args: :comments both

This file contains all the tools needed to build the QMCkl library.

* Helper functions
 #+NAME: header
 #+begin_src sh :tangle no :exports none :output none
echo "This file was created by tools/Building.org"
 #+end_src

  #+NAME: check-src
  #+begin_src bash
if [[ $(basename ${PWD}) != "src" ]] ; then
    echo "This script needs to be run in the src directory"
    exit -1
fi
  #+end_src

  #+NAME: url-issues
  : https://github.com/trex-coe/qmckl/issues

  #+NAME: url-web
  : https://trex-coe.github.io/qmckl

  #+NAME: license
  #+begin_example
BSD 3-Clause License

Copyright (c) 2020, TREX Center of Excellence
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  #+end_example

* Makefiles
** Makefile.in
:PROPERTIES:
:header-args: :tangle ../src/Makefile.in :noweb yes :comments org
:END:

This is the main Makefile invoked by the ~make~ command at the root
of the package. To compile the sources, it calls the =Makefile=
located in the =src= directory. This Makefile creates the source
file from the org-mode file, as well as a Makefile,
=Makefile.generated=, dedicated to the compilation of the sources.

*** Header

We want the Makefile to be POSIX-compliant, such that it works not
only with GNU Make.

#+begin_src makefile
# <<header()>>

.POSIX:
#+end_src

*** Compiler options

Compiler variables are obtained from the configure script (see =configure.ac=)

#+begin_src makefile
CC      = @CC@
FC      = @FC@
CFLAGS  = @CFLAGS@
FCFLAGS = @FCFLAGS@
LDFLAGS = @LDFLAGS@
DEFS    = @DEFS@

#+end_src

*** Variables

#+begin_src makefile
HAS_CPPCHECK = @HAS_CPPCHECK@

# VPATH-related substitution variables
srcdir = @srcdir@
VPATH  = @srcdir@

top_srcdir=$(srcdir)/..
shared_lib=$(top_srcdir)/lib/libqmckl.so
static_lib=$(top_srcdir)/lib/libqmckl.a
qmckl_h=$(top_srcdir)/include/qmckl.h
qmckl_f=$(top_srcdir)/share/qmckl/fortran/qmckl_f.f90

export CC CFLAGS DEFS FC FCFLAGS LIBS top_srcdir

ORG_SOURCE_FILES=$(wildcard $(srcdir)/*.org)
C_SOURCE_FILES=$(patsubst %.org,%.c,$(ORG_SOURCE_FILES))
INCLUDE=-I$(top_srcdir)/include/
#+end_src

*** Rules

The source files are created during the generation of the file ~Makefile.generated~.
The Makefile.generated is the one that will be distributed with the library.

#+begin_src makefile
.PHONY: clean shared static doc all check install uninstall
.SECONDARY: # Needed to keep the produced C and Fortran files

$(shared_lib) $(static_lib): $(qmckl_h) $(qmckl_f) Makefile.generated
	$(MAKE) -f Makefile.generated $@

install uninstall: Makefile.generated
	$(MAKE) -f Makefile.generated $@

$(qmckl_f) $(qmckl_h): Makefile.generated
	$(top_srcdir)/tools/build_qmckl_h.sh

shared: $(shared_lib)
static: $(static_lib)
all: shared static doc check

check: $(static_lib)
	$(MAKE) -f Makefile.generated check

ifeq ($(HAS_CPPCHECK),1)
cppcheck:
	cppcheck \
	--addon=cert \
	--enable=warning,style,performance,portability,information \
	qmckl_*.c
endif

doc: $(ORG_SOURCE_FILES)
	$(top_srcdir)/tools/build_doc.sh

clean:
	- $(MAKE) -f Makefile.generated clean
	- $(RM)	test_qmckl_* test_qmckl.c \
		$(qmckl_h) $(qmckl_f) \
		qmckl_*.f90 qmckl_*.c qmckl_*.h \
		Makefile.generated *.html *.txt

veryclean: clean FORCE
	- $(RM)	$(top_srcdir)/share/doc/qmckl/html/*.html \
	$(top_srcdir)/share/doc/qmckl/text/*.txt

Makefile.generated.in: Makefile $(top_srcdir)/tools/create_makefile.sh  $(ORG_SOURCE_FILES) $(top_srcdir)/tools/Building.org
	$(top_srcdir)/tools/create_makefile.sh

Makefile.generated: Makefile.generated.in 
	cd .. ; ./config.status

.SUFFIXES: .org .c

.org.c:
	$(top_srcdir)/tools/tangle.sh $<

#+end_src

** Script to generate auto-generated Makefile
  :PROPERTIES:
  :header-args: :tangle create_makefile.sh :noweb  yes :shebang #!/bin/bash :comments org
  :END:

  This script generates the Makefile that compiles the library.
  The ~OUTPUT~ variable contains the name of the generated Makefile,typically
  =Makefile.generated=.

  #+begin_src bash
# <<header()>>

<<check_src>>

OUTPUT=Makefile.generated.in
  #+end_src

  We start by tangling all the org-mode files.

  #+begin_src bash
${top_srcdir}/tools/tangle.sh *.org
${top_srcdir}/tools/build_qmckl_h.sh
  #+end_src

  Then we create the list of ~*.o~ files to be created, for library
  functions:

  #+begin_src bash
OBJECTS="qmckl_f.o"
for i in $(ls qmckl_*.c qmckl_*f.f90) ; do
    FILE=${i%.*}
    OBJECTS+=" ${FILE}.o"
done >> $OUTPUT
  #+end_src

  for tests in C:

  #+begin_src bash
TESTS=""
for i in $(ls test_qmckl_*.c) ; do
    FILE=${i%.c}
    TESTS+=" ${FILE}.o"
done >> $OUTPUT
  #+end_src

  and for tests in Fortran:

  #+begin_src bash
TESTS_F=""
for i in $(ls test_qmckl_*_f.f90) ; do
    FILE=${i%.f90}
    TESTS_F+=" ${FILE}.o"
done >> $OUTPUT
  #+end_src

  Finally, we append the variables to the Makefile

  #+begin_src bash :noweb yes
cat << EOF > ${OUTPUT}
.POSIX:
.SUFFIXES:

package  = @PACKAGE_TARNAME@
version  = @PACKAGE_VERSION@

# VPATH-related substitution variables
srcdir   = @srcdir@
VPATH    = @srcdir@

prefix   = @prefix@

CC       = @CC@
DEFS     = @DEFS@
CFLAGS   = @CFLAGS@ -I\$(top_srcdir)/munit/ -I\$(top_srcdir)/include -I.
CPPFLAGS = @CPPFLAGS@
LIBS     = @LIBS@

FC     = @FC@
FCFLAGS= @FCFLAGS@ 

OBJECT_FILES=$OBJECTS

TESTS   = $TESTS
TESTS_F = $TESTS_F

LIBS   = @LIBS@
FCLIBS = @FCLIBS@
EOF

export
echo '
<<rules>>
' >> ${OUTPUT}

  #+end_src

and the rules:

#+NAME: rules
  #+begin_src makefile :tangle no
top_srcdir=$(srcdir)/..
shared_lib=$(top_srcdir)/lib/libqmckl.so
static_lib=$(top_srcdir)/lib/libqmckl.a
qmckl_h=$(top_srcdir)/include/qmckl.h
qmckl_f=$(top_srcdir)/share/qmckl/fortran/qmckl_f.f90
munit=$(top_srcdir)/munit/munit.c

datarootdir=$(prefix)/share
datadir=$(datarootdir)
docdir=$(datarootdir)/doc/$(package)
htmldir=$(docdir)/html
libdir=$(prefix)/lib
includedir=$(prefix)/include
fortrandir=$(datarootdir)/$(package)/fortran


shared: $(shared_lib)
static: $(static_lib)


all: shared static

$(shared_lib): $(OBJECT_FILES)
	$(CC) -shared $(OBJECT_FILES) -o $(shared_lib)

$(static_lib): $(OBJECT_FILES)
	$(AR) rcs $(static_lib) $(OBJECT_FILES)


# Test

qmckl_f.o: $(qmckl_f)
	$(FC) $(FCFLAGS) -c $(qmckl_f) -o $@

test_qmckl: test_qmckl.c $(qmckl_h) $(static_lib) $(TESTS) $(TESTS_F)
	$(CC) $(CFLAGS) $(CPPFLAGS) $(DEFS) $(munit) $(TESTS) $(TESTS_F) \
	$(static_lib) $(LIBS) $(FCLIBS) test_qmckl.c -o $@

test_qmckl_shared: test_qmckl.c $(qmckl_h) $(shared_lib) $(TESTS) $(TESTS_F)
	$(CC) $(CFLAGS) $(CPPFLAGS) $(DEFS) \
	-Wl,-rpath,$(top_srcdir)/lib -L$(top_srcdir)/lib $(munit) $(TESTS) \
	$(TESTS_F) -lqmckl $(LIBS) $(FCLIBS) test_qmckl.c -o $@

check: test_qmckl test_qmckl_shared
	./test_qmckl

clean:
	$(RM) -- *.o *.mod $(shared_lib) $(static_lib) test_qmckl




install:
	install -d $(DESTDIR)$(prefix)/lib
	install -d $(DESTDIR)$(prefix)/include
	install -d $(DESTDIR)$(prefix)/share/qmckl/fortran
	install -d $(DESTDIR)$(prefix)/share/doc/qmckl/html/
	install -d $(DESTDIR)$(prefix)/share/doc/qmckl/text/
	install    $(shared_lib) $(DESTDIR)$(libdir)/
	install    $(static_lib) $(DESTDIR)$(libdir)/
	install    $(qmckl_h) $(DESTDIR)$(includedir)
	install    $(qmckl_f) $(DESTDIR)$(fortrandir)
	install    $(top_srcdir)/share/doc/qmckl/html/*.html $(DESTDIR)$(docdir)/html/
	install    $(top_srcdir)/share/doc/qmckl/html/*.css  $(DESTDIR)$(docdir)/html/
	install    $(top_srcdir)/share/doc/qmckl/text/*.txt  $(DESTDIR)$(docdir)/text/

uninstall:
	rm $(DESTDIR)$(libdir)/libqmckl.so
	rm $(DESTDIR)$(libdir)/libqmckl.a
	rm $(DESTDIR)$(includedir)/qmckl.h
	rm -rf $(DESTDIR)$(datarootdir)/$(package)
	rm -rf $(DESTDIR)$(docdir)

.SUFFIXES: .c .f90 .o

.c.o:
	$(CC) $(CFLAGS) $(CPPFLAGS) $(DEFS) -c $*.c -o $*.o

.f90.o: qmckl_f.o
	$(FC) $(FCFLAGS) -c $*.f90 -o $*.o

.PHONY: check cppcheck clean all
  #+end_src

* Script to tangle the org-mode files
  :PROPERTIES:
  :header-args: :tangle tangle.sh :noweb  yes :shebang #!/bin/bash :comments org
  :END:

  #+begin_src bash
# <<header()>>

<<check_src>>
  #+end_src

  This file needs to be run from the QMCKL =src= directory.

  It tangles all the files in the directory. It uses the
  =config_tangle.el= file, which contains information required to
  compute the current file names using for example ~(eval c)~ to get
  the name of the produced C file.

  The file is not tangled if the last modification date of the org
  file is less recent than one of the tangled files.

  #+begin_src bash
function tangle()
{
    local org_file=$1
    local c_file=${org_file%.org}.c
    local f_file=${org_file%.org}.f90

    if [[ ${org_file} -ot ${c_file} ]] ; then
        return
    elif [[ ${org_file} -ot ${f_file} ]] ; then
        return
    fi
    emacs --batch ${org_file} --load=${top_srcdir}/tools/config_tangle.el -f org-babel-tangle
}

for i in $@
do
    echo "--- ${i} ----"
    tangle ${i}
done
  #+end_src

* Script to build the final qmckl.h file
  :PROPERTIES:
  :header-args:bash: :tangle build_qmckl_h.sh :noweb  yes :shebang #!/bin/bash :comments org
  :END:

  #+begin_src bash :noweb yes
# <<header()>>

  #+end_src

  #+NAME: qmckl-header
  #+begin_src text :noweb yes
------------------------------------------
 QMCkl - Quantum Monte Carlo kernel library
 ------------------------------------------

 Documentation : <<url-web()>>
 Issues        : <<url-issues()>>

 <<license()>>


  #+end_src

  All the produced header files are concatenated in the =qmckl.h=
  file, located in the include directory. The =*_private.h= files
  are excluded.

  Put =.h= files in the correct order:

  #+begin_src bash
HEADERS=""
for i in $(cat table_of_contents)
do
    HEADERS+="${i%.org}_type.h "
done

for i in $(cat table_of_contents)
do
    HEADERS+="${i%.org}_func.h "
done
  #+end_src

  Generate C header file

  #+begin_src bash
OUTPUT="${top_srcdir}/include/qmckl.h"

cat << EOF > ${OUTPUT}
/*
 ,*    <<qmckl-header>>
 ,*/

#ifndef __QMCKL_H__
#define __QMCKL_H__

#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
EOF

for i in ${HEADERS}
do
    if [[ -f $i ]] ; then
        cat $i >> ${OUTPUT}
    fi
done

cat << EOF >> ${OUTPUT}
#endif
EOF
  #+end_src

  Generate Fortran interface file from all =qmckl_*_fh.f90= files

  #+begin_src bash
HEADERS_TYPE="qmckl_*_fh_type.f90"
HEADERS="qmckl_*_fh_func.f90"

OUTPUT="${top_srcdir}/share/qmckl/fortran/qmckl_f.f90"
cat << EOF > ${OUTPUT}
!
!    <<qmckl-header>>
!
module qmckl
  use, intrinsic :: iso_c_binding
EOF

for i in ${HEADERS_TYPE}
do
    cat $i >> ${OUTPUT}
done

for i in ${HEADERS}
do
    cat $i >> ${OUTPUT}
done

cat << EOF >> ${OUTPUT}
end module qmckl
EOF
  #+end_src

* Script to build the documentation
  :PROPERTIES:
  :header-args:bash: :tangle build_doc.sh :noweb  yes :shebang #!/bin/bash :comments org
  :END:

  First define readonly global variables.

  #+begin_src bash :noweb yes
readonly DOCS=${top_srcdir}/share/doc/qmckl/
readonly SRC=${top_srcdir}/src/
readonly HTMLIZE=${DOCS}/html/htmlize.el
readonly CONFIG_DOC=${top_srcdir}/tools/config_doc.el
readonly CONFIG_TANGLE=${top_srcdir}/tools/config_tangle.el
  #+end_src

  Check that all the defined global variables correspond to files.

  #+begin_src bash :noweb yes
function check_preconditions()
{
    if [[ -z ${top_srcdir} ]]
    then
        print "top_srcdir is not defined"
        exit 1
    fi

    for dir in ${DOCS}/html ${DOCS}/text ${SRC}
    do
        if [[ ! -d ${dir} ]]
        then
            print "${dir} not found"
            exit 2
        fi
    done

    for file in ${CONFIG_DOC} ${CONFIG_TANGLE}
    do
        if [[ ! -f ${file} ]]
        then
            print "${file} not found"
            exit 3
        fi
    done
}
  #+end_src

  ~install_htmlize~ installs the htmlize Emacs plugin if the
  =htmlize.el= file is not present.

  #+begin_src bash :noweb yes
function install_htmlize()
{
    local url="https://github.com/hniksic/emacs-htmlize"
    local repo="emacs-htmlize"

    [[ -f ${HTMLIZE} ]] || (
        cd ${DOCS}/html
        git clone ${url} \
            && cp ${repo}/htmlize.el ${HTMLIZE} \
            && rm -rf ${repo}
        cd -
    )

    # Assert htmlize is installed
    [[ -f ${HTMLIZE} ]] \
        || exit 1
}
  #+end_src

  Extract documentation from an org-mode file.

  #+begin_src bash :noweb yes
function extract_doc()
{
    local org=$1
    local local_html=${SRC}/${org%.org}.html
    local local_text=${SRC}/${org%.org}.txt
    local html=${DOCS}/html/${org%.org}.html
    local text=${DOCS}/text/${org%.org}.txt

    if [[ -f ${html} && ${org} -ot ${html} ]]
    then
        return
    fi
    emacs --batch                    \
          --load ${HTMLIZE}          \
          --load ${CONFIG_DOC}       \
          ${org}                     \
          --load ${CONFIG_TANGLE}    \
          -f org-html-export-to-html \
          -f org-ascii-export-to-ascii
    mv ${local_html} ${DOCS}/html
    mv ${local_text} ${DOCS}/text

}
  #+end_src

  The main function of the script.

  #+begin_src bash :noweb yes
function main() {

    check_preconditions || exit 1

    # Install htmlize if needed
    install_htmlize || exit 2

    # Create documentation
    cd ${SRC} \
        || exit 3

    for i in *.org
    do
        echo
        echo "=======  ${i} ======="
        extract_doc ${i}
    done

    if [[ $? -eq 0 ]]
    then
        cd ${DOCS}/html
        rm -f index.html
        ln README.html index.html
        exit 0
    else
        exit 3
    fi
}
main
  #+end_src