#!/bin/sh
############################################################
# This UNIX script builds the f2c FORTRAN --> C translator #
# under Mac OS X.                                          #
# Make this script executable with "chmod +x buildf2c"     #
############################################################
echo "==================================="
echo "Build f2c FORTRAN --> C translator."
echo "==================================="
echo "USAGE:  ./buildf2c"

######################################
# Set trap to allow abort on signal: #
######################################
trap 'echo "Interrupted by signal" >&2; exit' 1 2 3 15

########################################################
# 1. Download f2c source from Bell Labs.               #
# (Tar file is not visible - it's created on the fly.) #
########################################################
echo "--------------------------------------------"
echo "1. Downloading f2c source from Bell Labs ..."
echo "--------------------------------------------"
if test ! -e f2c.tar; then
    wget --passive-ftp ftp://netlib.bell-labs.com/netlib/f2c.tar
    #curl ftp://netlib.bell-labs.com/netlib/f2c.tar -o "f2c.tar"
fi
echo "... done."

#####################################
# 2. Uncompress f2c tarred archive: #
#####################################
echo "-------------------------------"
echo "2. Uncompressing f2c source ..."
echo "-------------------------------"
if test -d f2c; then
    rm -r f2c
fi
tar -xvf f2c.tar
gunzip -rf f2c/*
cd f2c
unzip libf2c.zip
cd ..
echo "... done."

###############################################################
# 3. Prepare the unix makefiles for building the f2c library. #
#    Note: CC compiler switched from 'cc' to 'gcc'            #
###############################################################
echo "-------------------------------------------"
echo "3. Preparing makefiles for building f2c ..."
echo "-------------------------------------------"
sed 's/CC = cc/CC = gcc/' f2c/libf2c/makefile.u | sed 's/a.out/a.exe/' > f2c/libf2c/makefile
sed 's/CC = cc/CC = gcc/' f2c/src/makefile.u | sed 's/a.out/a.exe/' > f2c/src/makefile
echo "... done."

##########################################
# 4. Create and install f2c header file. #
# If you use a C++ compiler:  make hadd  #
# Otherwise:                  make f2c.h #
##########################################
echo "----------------------------------------------------"
echo "4. Creating and installing f2c header file f2c.h ..."
echo "----------------------------------------------------"
cd f2c/libf2c
make f2c.h
if test ! -d /usr/local/include; then
    mkdir -p /usr/local/include
fi
cp f2c.h /usr/local/include/
echo "... done."

################################################
# 5. Create and install f2c library "libf2c.a" #
################################################
echo "-----------------------------------------------------"
echo "5. Creating and installing f2c library "libf2c.a" ..."
echo "-----------------------------------------------------"
make
if test ! -d /usr/local/lib; then
    mkdir -p /usr/local/lib
fi
cp libf2c.a /usr/local/lib/
ranlib /usr/local/lib/libf2c.a
echo "... done."

######################################
# 6. Make executable f2c translator: #
######################################
echo "---------------------------------------------"
echo "6. Creating and installing f2c translator ..."
echo "---------------------------------------------"
cd ../src
make
if test ! -d /usr/local/bin; then
    mkdir -p /usr/local/bin
fi
cp f2c /usr/local/bin/
ln -s /usr/local/bin/f2c /bin/f2c
echo "... done."

################################################################
# 7. Install fc script:                                        #
#                                                              #
# 1. Remove "-Olimit 2000" in the -O processing options within #
#    the 'fc' script.                                          #
# 2. Eliminate all references to the math library (-lm) in     #
#    the script 'fc' since it is included the System framework #
#    and is linked by default under Mac OS X.                  #
# 3. Eliminate '-u MAIN__' at the bottom of the 'fc' script.   #
#    You will have to explitly load FORTRAN MAIN programs      #
#    (explicitly mention the relevant .f or .o file).          #
################################################################
echo "---------------------------"
echo "7. Installing fc script ..."
echo "---------------------------"
cd ..
mv fc fc.orig
sed 's/ -Olimit 2000//g; s/ -lm//g; s/ -u MAIN__//g' fc.orig > fc
chmod +x fc
cp fc /usr/local/bin/
ln -s /usr/local/bin/fc /bin/fc
ln -s /usr/local/bin/fc /bin/f77
echo "... done."

#########################
# 8. Install man pages: #
#########################
echo "---------------------------"
echo "8. Installing man pages ..."
echo "---------------------------"
cp f2c.1t /usr/share/man/man1/f2c.1
echo "... done."

################
# 9. Clean up: #
################
echo "------------------"
echo "9. Cleaning up ..."
echo "------------------"
cd src
make clean
cd ../libf2c
make clean
cd ../..
echo "... All done!"

#############################################
# 10. Test f2c on your FORTRAN source code: #
#############################################
echo "======================================================"
echo "======================================================"
echo "======================================================"
echo "   === To test f2c on your FORTRAN source code: ==="
echo "   === cd ~/wherever/your/code/is               ==="
echo "   === 1. f2c myprog.f                          ==="
echo "   ===    cc -O -o myprog.exe myprog.c -lf2c    ==="
echo "   ===    myprog.exe                            ==="
echo "   === 2. fc -O -w -o myprog.exe myprog.f       ==="
echo "   ===    myprog.exe                            ==="
echo "======================================================"
echo "======================================================"
echo "======================================================"

exit