#!/bin/bash
#
# ELS script to build ncurses-5.7 with fallback support. 
#
# ncurses in a terminal control library that allows programs to
# display output at any position on the screen rather than scrolling
# line-by-line.  ncurses is needed for full-screen console-based
# programs like vi.  Fallback support for linux and vt100 consoles
# is included so that these types of terminals will continue to work
# even if the terminfo database is corrupted or destroyed.
#
# Source is from ftp://ftp.gnu.org/gnu/ncurses/
#
#
# This script is public domain software and may be freely copied.
#
# This script 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.
#
#
# Define the package name, source directory, build directory and
# staging directory paths.  Prefixes to directories may be overridden
# by setting shell variables SRC, BUILD and STAGING.  For example,
# doing "export SRC=/root/foo" before calling this script will override
# the default /usr/src and set SRC_DIR to /root/foo/$PKG_NAME instead.
#
PKG_NAME=$(basename $0)
SRC_DIR=${SRC:-/usr/src}/$PKG_NAME
# Remove "-fallback" from the source path using sed.
SRC_DIR=$(echo "$SRC_DIR" | sed s/-fallback//)
BUILD_DIR=${BUILD:-/var/tmp/build}/$PKG_NAME
STAGING_DIR=${STAGING:-/var/tmp/staging}/$PKG_NAME

# Check that the source directory really exits and bail out if not.
if ! [ -d $SRC_DIR ]; then
  echo "$PKG_NAME: Cannot find source code directory $SRC_DIR."
  exit 1
fi

# Do not overwrite existing build directory.
if [ -d $BUILD_DIR ]; then
  echo "$PKG_NAME: Build directory $BUILD_DIR already exists."
  exit 2
else
  mkdir -p $BUILD_DIR
fi

# Do not overwrite existing staging directory.
if [ -d $STAGING_DIR ]; then
  echo "$PKG_NAME: Staging directory $STAGING_DIR already exists."
  exit 4
else
  mkdir -p $STAGING_DIR
fi

# Configure the package for FHS compliance and i586 processor.  There
# are also some ncurses specific options.  --with-fallbacks  gives
# support for listed terminal types even if the terminfo database
# cannot be located.  --without-ada skips ADA support when building.
# This is logical since the blueprint for gcc skips ADA as well.
export CC="gcc -march=i586"
cd $BUILD_DIR
$SRC_DIR/configure \
  --build=i586-pc-linux-gnu \
  --mandir=/usr/share/man \
  --prefix=/usr \
  --with-fallbacks=linux,vt100,xterm \
  --with-install-prefix=$STAGING_DIR \
  --with-shared \
  --without-ada

# Check return status and bail out if it's non-zero.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Configuration failed!"
  exit 8
fi

# Build the package.
make

# Check return code and bail if it looks bad.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Build failed!"
  exit 16
fi

# Install into staging area.  Overriding make variables is not
# necessary since the configure script has the --with-install-prefix
# option.
make install

# Check return code and bail if it looks bad.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Installation to staging area failed!"
  exit 32
fi

# Keep a copy of the license document.
install -D -o root -g root -m 644 $SRC_DIR/README \
  $STAGING_DIR/usr/share/doc/$PKG_NAME/LICENSE

# Strip binaries and libraries and compress documentation to save space.
strip $STAGING_DIR/usr/bin/*
strip --strip-debug $STAGING_DIR/usr/lib/*
gzip -r $STAGING_DIR/usr/share/man
gzip -r $STAGING_DIR/usr/share/doc

# Create the package
if ! [ "$PKG_COMMAND" = "" ]; then
  export $PKG_NAME $STAGING_DIR
  $PKG_COMMAND
else
  cd $STAGING_DIR
  tar -zcf ../$PKG_NAME.i586.tar.gz *
fi

# end of blueprint