#!/bin/sh

# run from directory where this script is
cd `echo $0 | sed 's/\(.*\)\/.*/\1/'` # extract pathname
EXAMPLE_DIR=`pwd`

# check whether echo has the -e option
if test "`echo -e`" = "-e" ; then ECHO=echo ; else ECHO="echo -e" ; fi

$ECHO
$ECHO "$EXAMPLE_DIR : starting"
$ECHO
$ECHO "This example shows how to use pw.x to calculate the total energy and"
$ECHO "the band structure of four simple systems: Si, Al, Cu, Ni."

# set the needed environment variables
. ../../../environment_variables

# required executables and pseudopotentials
BIN_LIST="pw.x"
PSEUDO_LIST="Si.pz-vbc.UPF Al.pz-vbc.UPF Cu.pz-d-rrkjus.UPF Ni.pz-nd-rrkjus.UPF"

$ECHO
$ECHO "  executables directory: $BIN_DIR"
$ECHO "  pseudo directory:      $PSEUDO_DIR"
$ECHO "  temporary directory:   $TMP_DIR"
$ECHO "  checking that needed directories and files exist...\c"

# check for directories
for DIR in "$BIN_DIR" "$PSEUDO_DIR" ; do
    if test ! -d $DIR ; then
        $ECHO
        $ECHO "ERROR: $DIR not existent or not a directory"
        $ECHO "Aborting"
        exit 1
    fi
done
for DIR in "$TMP_DIR" "$EXAMPLE_DIR/results" ; do
    if test ! -d $DIR ; then
        mkdir $DIR
    fi
done
cd $EXAMPLE_DIR/results

# check for executables
for FILE in $BIN_LIST ; do
    if test ! -x $BIN_DIR/$FILE ; then
        $ECHO
        $ECHO "ERROR: $BIN_DIR/$FILE not existent or not executable"
        $ECHO "Aborting"
        exit 1
    fi
done

# check for pseudopotentials
for FILE in $PSEUDO_LIST ; do
    if test ! -r $PSEUDO_DIR/$FILE ; then
       $ECHO
       $ECHO "Downloading $FILE to $PSEUDO_DIR...\c"
            $WGET $PSEUDO_DIR/$FILE $NETWORK_PSEUDO/$FILE 2> /dev/null
    fi
    if test $? != 0; then
        $ECHO
        $ECHO "ERROR: $PSEUDO_DIR/$FILE not existent or not readable"
        $ECHO "Aborting"
        exit 1
    fi
done
$ECHO " done"

# how to run executables
PW_COMMAND="$PARA_PREFIX $BIN_DIR/pw.x $PARA_POSTFIX"
$ECHO
$ECHO "  running pw.x as: $PW_COMMAND"
$ECHO

for diago in david cg ; do

    # self-consistent calculation
    cat > si.scf.$diago.in << EOF
 &control
    calculation = 'scf'
    restart_mode='from_scratch',
    prefix='silicon',
    tstress = .true.
    tprnfor = .true.
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/'
 /
 &system
    ibrav=  2, celldm(1) =10.20, nat=  2, ntyp= 1,
    ecutwfc =18.0,
 /
 &electrons
    diagonalization='$diago'
    mixing_mode = 'plain'
    mixing_beta = 0.7
    conv_thr =  1.0d-8
 /
ATOMIC_SPECIES
 Si  28.086  Si.pz-vbc.UPF
ATOMIC_POSITIONS
 Si 0.00 0.00 0.00
 Si 0.25 0.25 0.25
K_POINTS
  10
   0.1250000  0.1250000  0.1250000   1.00
   0.1250000  0.1250000  0.3750000   3.00
   0.1250000  0.1250000  0.6250000   3.00
   0.1250000  0.1250000  0.8750000   3.00
   0.1250000  0.3750000  0.3750000   3.00
   0.1250000  0.3750000  0.6250000   6.00
   0.1250000  0.3750000  0.8750000   6.00
   0.1250000  0.6250000  0.6250000   3.00
   0.3750000  0.3750000  0.3750000   1.00
   0.3750000  0.3750000  0.6250000   3.00
EOF
    $ECHO "  running the scf calculation for Si...\c"
    $PW_COMMAND < si.scf.$diago.in > si.scf.$diago.out
    check_failure $?
    $ECHO " done"

    # band structure calculation along delta, sigma and lambda lines
    cat > si.band.$diago.in << EOF
 &control
    calculation='bands'
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/',
    prefix='silicon'
 /
 &system
    ibrav=  2, celldm(1) =10.20, nat=  2, ntyp= 1,
    ecutwfc =18.0, nbnd = 8,
 /
 &electrons
    diagonalization='$diago'
 /
ATOMIC_SPECIES
 Si  28.086  Si.pz-vbc.UPF
ATOMIC_POSITIONS
 Si 0.00 0.00 0.00
 Si 0.25 0.25 0.25
K_POINTS
 28
   0.0 0.0 0.0 1.0
   0.0 0.0 0.1 1.0
   0.0 0.0 0.2 1.0
   0.0 0.0 0.3 1.0
   0.0 0.0 0.4 1.0
   0.0 0.0 0.5 1.0
   0.0 0.0 0.6 1.0
   0.0 0.0 0.7 1.0
   0.0 0.0 0.8 1.0
   0.0 0.0 0.9 1.0
   0.0 0.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.0 0.1 0.1 1.0
   0.0 0.2 0.2 1.0
   0.0 0.3 0.3 1.0
   0.0 0.4 0.4 1.0
   0.0 0.5 0.5 1.0
   0.0 0.6 0.6 1.0
   0.0 0.7 0.7 1.0
   0.0 0.8 0.8 1.0
   0.0 0.9 0.9 1.0
   0.0 1.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.1 0.1 0.1 1.0
   0.2 0.2 0.2 1.0
   0.3 0.3 0.3 1.0
   0.4 0.4 0.4 1.0
   0.5 0.5 0.5 1.0
EOF
    $ECHO "  running the band-structure calculation for Si...\c"
    $PW_COMMAND < si.band.$diago.in > si.band.$diago.out
    check_failure $?
    $ECHO " done"

    # clean TMP_DIR
    $ECHO "  cleaning $TMP_DIR...\c"
    rm -rf $TMP_DIR/silicon*
    $ECHO " done"

    # self-consistent calculation
    cat > al.scf.$diago.in << EOF
 &control
    calculation='scf'
    restart_mode='from_scratch',
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/',
    prefix='al'
    tprnfor = .true.
    tstress = .true.
 /
 &system
    ibrav=  2, celldm(1) =7.50, nat=  1, ntyp= 1, ecutwfc =15.0,
    occupations='smearing', smearing='marzari-vanderbilt', degauss=0.05
 /
 &electrons
    diagonalization='$diago'
    mixing_beta = 0.7
 /
ATOMIC_SPECIES
 Al  26.98 Al.pz-vbc.UPF
ATOMIC_POSITIONS
 Al 0.00 0.00 0.00
K_POINTS
  60
   0.0625000  0.0625000  0.0625000   1.00
   0.0625000  0.0625000  0.1875000   3.00
   0.0625000  0.0625000  0.3125000   3.00
   0.0625000  0.0625000  0.4375000   3.00
   0.0625000  0.0625000  0.5625000   3.00
   0.0625000  0.0625000  0.6875000   3.00
   0.0625000  0.0625000  0.8125000   3.00
   0.0625000  0.0625000  0.9375000   3.00
   0.0625000  0.1875000  0.1875000   3.00
   0.0625000  0.1875000  0.3125000   6.00
   0.0625000  0.1875000  0.4375000   6.00
   0.0625000  0.1875000  0.5625000   6.00
   0.0625000  0.1875000  0.6875000   6.00
   0.0625000  0.1875000  0.8125000   6.00
   0.0625000  0.1875000  0.9375000   6.00
   0.0625000  0.3125000  0.3125000   3.00
   0.0625000  0.3125000  0.4375000   6.00
   0.0625000  0.3125000  0.5625000   6.00
   0.0625000  0.3125000  0.6875000   6.00
   0.0625000  0.3125000  0.8125000   6.00
   0.0625000  0.3125000  0.9375000   6.00
   0.0625000  0.4375000  0.4375000   3.00
   0.0625000  0.4375000  0.5625000   6.00
   0.0625000  0.4375000  0.6875000   6.00
   0.0625000  0.4375000  0.8125000   6.00
   0.0625000  0.4375000  0.9375000   6.00
   0.0625000  0.5625000  0.5625000   3.00
   0.0625000  0.5625000  0.6875000   6.00
   0.0625000  0.5625000  0.8125000   6.00
   0.0625000  0.6875000  0.6875000   3.00
   0.0625000  0.6875000  0.8125000   6.00
   0.0625000  0.8125000  0.8125000   3.00
   0.1875000  0.1875000  0.1875000   1.00
   0.1875000  0.1875000  0.3125000   3.00
   0.1875000  0.1875000  0.4375000   3.00
   0.1875000  0.1875000  0.5625000   3.00
   0.1875000  0.1875000  0.6875000   3.00
   0.1875000  0.1875000  0.8125000   3.00
   0.1875000  0.3125000  0.3125000   3.00
   0.1875000  0.3125000  0.4375000   6.00
   0.1875000  0.3125000  0.5625000   6.00
   0.1875000  0.3125000  0.6875000   6.00
   0.1875000  0.3125000  0.8125000   6.00
   0.1875000  0.4375000  0.4375000   3.00
   0.1875000  0.4375000  0.5625000   6.00
   0.1875000  0.4375000  0.6875000   6.00
   0.1875000  0.4375000  0.8125000   6.00
   0.1875000  0.5625000  0.5625000   3.00
   0.1875000  0.5625000  0.6875000   6.00
   0.1875000  0.6875000  0.6875000   3.00
   0.3125000  0.3125000  0.3125000   1.00
   0.3125000  0.3125000  0.4375000   3.00
   0.3125000  0.3125000  0.5625000   3.00
   0.3125000  0.3125000  0.6875000   3.00
   0.3125000  0.4375000  0.4375000   3.00
   0.3125000  0.4375000  0.5625000   6.00
   0.3125000  0.4375000  0.6875000   6.00
   0.3125000  0.5625000  0.5625000   3.00
   0.4375000  0.4375000  0.4375000   1.00
   0.4375000  0.4375000  0.5625000   3.00
EOF
    $ECHO "  running the scf calculation for Al...\c"
    $PW_COMMAND < al.scf.$diago.in > al.scf.$diago.out
    check_failure $?
    $ECHO " done"

    # band structure calculation along delta, sigma and lambda lines
    cat > al.band.$diago.in << EOF
 &control
    calculation='bands'
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/'
    prefix='al'
 /
 &system
    ibrav= 2, celldm(1) =7.50, nat=  1, ntyp= 1,
    ecutwfc =15.0, nbnd = 8
 /
 &electrons
    diagonalization='$diago'
 /
ATOMIC_SPECIES
 Al  26.98 Al.pz-vbc.UPF
ATOMIC_POSITIONS
 Al 0.00 0.00 0.00
K_POINTS
 28
   0.0 0.0 0.0 1.0
   0.0 0.0 0.1 1.0
   0.0 0.0 0.2 1.0
   0.0 0.0 0.3 1.0
   0.0 0.0 0.4 1.0
   0.0 0.0 0.5 1.0
   0.0 0.0 0.6 1.0
   0.0 0.0 0.7 1.0
   0.0 0.0 0.8 1.0
   0.0 0.0 0.9 1.0
   0.0 0.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.0 0.1 0.1 1.0
   0.0 0.2 0.2 1.0
   0.0 0.3 0.3 1.0
   0.0 0.4 0.4 1.0
   0.0 0.5 0.5 1.0
   0.0 0.6 0.6 1.0
   0.0 0.7 0.7 1.0
   0.0 0.8 0.8 1.0
   0.0 0.9 0.9 1.0
   0.0 1.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.1 0.1 0.1 1.0
   0.2 0.2 0.2 1.0
   0.3 0.3 0.3 1.0
   0.4 0.4 0.4 1.0
   0.5 0.5 0.5 1.0
EOF
    $ECHO "  running the band-structure calculation for Al...\c"
    $PW_COMMAND < al.band.$diago.in > al.band.$diago.out
    check_failure $?
    $ECHO " done"

    # clean TMP_DIR
    $ECHO "  cleaning $TMP_DIR...\c"
    rm -rf $TMP_DIR/al*
    $ECHO " done"

    # self-consistent calculation
    cat > cu.scf.$diago.in << EOF
 &control
    calculation='scf'
    restart_mode='from_scratch',
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/'
    prefix='cu'
    tstress = .true.
    tprnfor = .true.
 /
 &system
    ibrav = 2, celldm(1) =6.73, nat= 1, ntyp= 1,
    ecutwfc = 25.0, ecutrho = 300.0
    occupations='smearing', smearing='marzari-vanderbilt', degauss=0.02
 /
 &electrons
    diagonalization='$diago'
    conv_thr = 1.0e-8
    mixing_beta = 0.7
 /
ATOMIC_SPECIES
 Cu 63.55 Cu.pz-d-rrkjus.UPF
ATOMIC_POSITIONS
 Cu 0.0 0.0 0.0
K_POINTS (automatic)
 8 8 8 0 0 0
EOF
    $ECHO "  running the scf calculation for Cu...\c"
    $PW_COMMAND < cu.scf.$diago.in > cu.scf.$diago.out
    check_failure $?
    $ECHO " done"

    # band structure calculation along delta, sigma and lambda lines
    cat > cu.band.$diago.in << EOF
 &control
    calculation='bands'
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/',
    prefix='cu'
 /
 &system
    ibrav = 2, celldm(1) =6.73, nat= 1, ntyp= 1,
    ecutwfc = 25.0, ecutrho = 300.0, nbnd = 8
 /
 &electrons
    diagonalization='$diago'
 /
ATOMIC_SPECIES
 Cu  63.55 Cu.pz-d-rrkjus.UPF
ATOMIC_POSITIONS
 Cu 0.0 0.0 0.0
K_POINTS
 28
   0.0 0.0 0.0 1.0
   0.0 0.0 0.1 1.0
   0.0 0.0 0.2 1.0
   0.0 0.0 0.3 1.0
   0.0 0.0 0.4 1.0
   0.0 0.0 0.5 1.0
   0.0 0.0 0.6 1.0
   0.0 0.0 0.7 1.0
   0.0 0.0 0.8 1.0
   0.0 0.0 0.9 1.0
   0.0 0.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.0 0.1 0.1 1.0
   0.0 0.2 0.2 1.0
   0.0 0.3 0.3 1.0
   0.0 0.4 0.4 1.0
   0.0 0.5 0.5 1.0
   0.0 0.6 0.6 1.0
   0.0 0.7 0.7 1.0
   0.0 0.8 0.8 1.0
   0.0 0.9 0.9 1.0
   0.0 1.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.1 0.1 0.1 1.0
   0.2 0.2 0.2 1.0
   0.3 0.3 0.3 1.0
   0.4 0.4 0.4 1.0
   0.5 0.5 0.5 1.0
EOF
    $ECHO "  running the band-structure calculation for Cu...\c"
    $PW_COMMAND < cu.band.$diago.in > cu.band.$diago.out
    check_failure $?
    $ECHO " done"

    # clean TMP_DIR
    $ECHO "  cleaning $TMP_DIR...\c"
    rm -rf $TMP_DIR/cu*
    $ECHO " done"

    # self-consistent calculation
    cat > ni.scf.$diago.in << EOF
 &control
    calculation='scf'
    restart_mode='from_scratch',
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/'
    prefix='ni'
    tprnfor = .true.,
    tstress = .true.
 /
 &system
    ibrav=2, celldm(1) =6.48, nat=1, ntyp=1,
    nspin = 2,  starting_magnetization(1)=0.7,
    ecutwfc = 24.0, ecutrho = 288.0,
    occupations='smearing', smearing='marzari-vanderbilt', degauss=0.02
 /
 &electrons
    diagonalization='$diago'
    conv_thr = 1.0e-8
    mixing_beta = 0.7
 /
ATOMIC_SPECIES
 Ni 58.69 Ni.pz-nd-rrkjus.UPF
ATOMIC_POSITIONS
 Ni 0.0 0.0 0.0
K_POINTS
 60
   0.0625000  0.0625000  0.0625000   1.00
   0.0625000  0.0625000  0.1875000   3.00
   0.0625000  0.0625000  0.3125000   3.00
   0.0625000  0.0625000  0.4375000   3.00
   0.0625000  0.0625000  0.5625000   3.00
   0.0625000  0.0625000  0.6875000   3.00
   0.0625000  0.0625000  0.8125000   3.00
   0.0625000  0.0625000  0.9375000   3.00
   0.0625000  0.1875000  0.1875000   3.00
   0.0625000  0.1875000  0.3125000   6.00
   0.0625000  0.1875000  0.4375000   6.00
   0.0625000  0.1875000  0.5625000   6.00
   0.0625000  0.1875000  0.6875000   6.00
   0.0625000  0.1875000  0.8125000   6.00
   0.0625000  0.1875000  0.9375000   6.00
   0.0625000  0.3125000  0.3125000   3.00
   0.0625000  0.3125000  0.4375000   6.00
   0.0625000  0.3125000  0.5625000   6.00
   0.0625000  0.3125000  0.6875000   6.00
   0.0625000  0.3125000  0.8125000   6.00
   0.0625000  0.3125000  0.9375000   6.00
   0.0625000  0.4375000  0.4375000   3.00
   0.0625000  0.4375000  0.5625000   6.00
   0.0625000  0.4375000  0.6875000   6.00
   0.0625000  0.4375000  0.8125000   6.00
   0.0625000  0.4375000  0.9375000   6.00
   0.0625000  0.5625000  0.5625000   3.00
   0.0625000  0.5625000  0.6875000   6.00
   0.0625000  0.5625000  0.8125000   6.00
   0.0625000  0.6875000  0.6875000   3.00
   0.0625000  0.6875000  0.8125000   6.00
   0.0625000  0.8125000  0.8125000   3.00
   0.1875000  0.1875000  0.1875000   1.00
   0.1875000  0.1875000  0.3125000   3.00
   0.1875000  0.1875000  0.4375000   3.00
   0.1875000  0.1875000  0.5625000   3.00
   0.1875000  0.1875000  0.6875000   3.00
   0.1875000  0.1875000  0.8125000   3.00
   0.1875000  0.3125000  0.3125000   3.00
   0.1875000  0.3125000  0.4375000   6.00
   0.1875000  0.3125000  0.5625000   6.00
   0.1875000  0.3125000  0.6875000   6.00
   0.1875000  0.3125000  0.8125000   6.00
   0.1875000  0.4375000  0.4375000   3.00
   0.1875000  0.4375000  0.5625000   6.00
   0.1875000  0.4375000  0.6875000   6.00
   0.1875000  0.4375000  0.8125000   6.00
   0.1875000  0.5625000  0.5625000   3.00
   0.1875000  0.5625000  0.6875000   6.00
   0.1875000  0.6875000  0.6875000   3.00
   0.3125000  0.3125000  0.3125000   1.00
   0.3125000  0.3125000  0.4375000   3.00
   0.3125000  0.3125000  0.5625000   3.00
   0.3125000  0.3125000  0.6875000   3.00
   0.3125000  0.4375000  0.4375000   3.00
   0.3125000  0.4375000  0.5625000   6.00
   0.3125000  0.4375000  0.6875000   6.00
   0.3125000  0.5625000  0.5625000   3.00
   0.4375000  0.4375000  0.4375000   1.00
   0.4375000  0.4375000  0.5625000   3.00
EOF
    $ECHO "  running the scf calculation for Ni...\c"
    $PW_COMMAND < ni.scf.$diago.in > ni.scf.$diago.out
    check_failure $?
    $ECHO " done"

    # band structure calculation along delta, sigma and lambda lines
    cat > ni.band.$diago.in << EOF
 &control
    calculation='bands'
    pseudo_dir = '$PSEUDO_DIR/',
    outdir='$TMP_DIR/'
    prefix='ni'
 /
 &system
    ibrav=2, celldm(1) =6.48, nat=1, ntyp=1,
    nspin = 2,  starting_magnetization(1)=0.7,
    ecutwfc = 24.0, ecutrho = 288.0, nbnd = 8
 /
 &electrons
    diagonalization='$diago'
 /
ATOMIC_SPECIES
 Ni 58.69 Ni.pz-nd-rrkjus.UPF
ATOMIC_POSITIONS
 Ni 0.0 0.0 0.0
K_POINTS
 28
   0.0 0.0 0.0 1.0
   0.0 0.0 0.1 1.0
   0.0 0.0 0.2 1.0
   0.0 0.0 0.3 1.0
   0.0 0.0 0.4 1.0
   0.0 0.0 0.5 1.0
   0.0 0.0 0.6 1.0
   0.0 0.0 0.7 1.0
   0.0 0.0 0.8 1.0
   0.0 0.0 0.9 1.0
   0.0 0.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.0 0.1 0.1 1.0
   0.0 0.2 0.2 1.0
   0.0 0.3 0.3 1.0
   0.0 0.4 0.4 1.0
   0.0 0.5 0.5 1.0
   0.0 0.6 0.6 1.0
   0.0 0.7 0.7 1.0
   0.0 0.8 0.8 1.0
   0.0 0.9 0.9 1.0
   0.0 1.0 1.0 1.0
   0.0 0.0 0.0 1.0
   0.1 0.1 0.1 1.0
   0.2 0.2 0.2 1.0
   0.3 0.3 0.3 1.0
   0.4 0.4 0.4 1.0
   0.5 0.5 0.5 1.0
EOF
    $ECHO "  running the band-structure calculation for Ni...\c"
    $PW_COMMAND < ni.band.$diago.in > ni.band.$diago.out|
    check_failure $?
    $ECHO " done"

    $ECHO "  cleaning $TMP_DIR...\c"
    rm -rf $TMP_DIR/ni*
    $ECHO " done"
done
$ECHO
$ECHO "$EXAMPLE_DIR : done"