configure

#!/bin/sh

set -eu

eecho () {
  echo "$*" >&2
}

fail() {
  eecho "$0: $*"
  exit 1
}

usage () {
  cat <<EOF
./configure [OPTS...]

where OPTS are:
  CC=...
  CFLAGS=...
  LDFLAGS=...
  --prefix=...
  
  --janet-header-cflags=...
    
    Compiler flags specifying the include path
    of the janet headers the extension module is built against.
    
    If not specifed, 'pkg-config --cflags janet' is used.

  --with-pkg-config-readline
    
    Use pkg-config to try and find the right compiler
    and linker flags for the readline library. This is the default.
  
  --with-pkg-config-libedit
    
    Use pkg-config to try and find the right compiler
    and linker flags for the libedit library. This
    library replaces readline.
  
  --with-readnoise
    
    Use the bundled readnoise library instead of depending
    on a system readline or editline.
  
  --readline-cflags=...
    Manually specify the required cflags for using the desired readline compatible library.
  
  --readline-ldflags=...
    Manually specify the required ldflags for linking the desired readline compatible library.
EOF
  exit 1
}

WITH_MANUAL_JANET="n"
JANET_HEADER_CFLAGS=""
WITH_PKGCONFIG_READLINE="y"
WITH_PKGCONFIG_LIBEDIT="n"
WITH_READNOISE="n"
WITH_MANUAL_READLINE="n"
READLINE_CFLAGS=""
READLINE_LDFLAGS=""
prefix="/usr"
CC="${CC:-cc}"
CFLAGS="${CFLAGS:--Wall -Wfatal-errors -O2}"
LDFLAGS="${LDFLAGS:-}"

for arg ; do
  case "$arg" in
  --prefix=*) prefix=${arg#*=} ;;  
  --janet-header-cflags=*) 
    WITH_MANUAL_JANET="y"
    JANET_HEADER_CFLAGS=${arg#*=} ;;
  --readline-cflags=*)
    WITH_MANUAL_READLINE="y"
    READLINE_CFLAGS=${arg#*=}
    ;;
  --readline-ldflags=*)
    WITH_MANUAL_READLINE="y"
    READLINE_LDFLAGS=${arg#*=}
    ;;
  --with-pkg-config-readline) 
    WITH_PKGCONFIG_READLINE="y"
  ;;
 --with-pkg-config-libedit) 
    WITH_PKGCONFIG_LIBEDIT="y"
  ;;
  --with-readnoise) 
    WITH_READNOISE="y"
  ;;
  CC=*) CC=${arg#*=} ;;
  CFLAGS=*) CFLAGS=${arg#*=} ;;
  LDFLAGS=*) LDFLAGS=${arg#*=} ;;
  --help) usage ;;
  *) fail "unknown option '$arg'"
  esac
done

if test "$WITH_MANUAL_JANET" = "y"
then
  eecho "using manually specifed janet headers."
else
  eecho "using pkg-config to find janet headers."
  JANET_HEADER_CFLAGS="$(pkg-config --cflags janet)"
fi

if test WITH_MANUAL_READLINE = "y"
then
  eecho "using manually specified readline library."
elif test "$WITH_READNOISE" = "y"
then
  eecho "using bundled readnoise."
  READLINE_CFLAGS="-I./src/readnoise"
  READLINE_LDFLAGS=""
elif test "$WITH_PKGCONFIG_LIBEDIT" = "y"
then
  eecho "using pkg-config to find libedit."
  READLINE_CFLAGS="$(pkg-config --cflags libedit) -D SHLIB_NO_HISTORY_INCLUDE"
  READLINE_LDFLAGS="$(pkg-config --libs  libedit)"
elif test "$WITH_PKGCONFIG_READLINE" = "y"
then
  eecho "using pkg-config to find readline."
  READLINE_CFLAGS="$(pkg-config --cflags readline)"
  READLINE_LDFLAGS="$(pkg-config --libs  readline)"
else
  fail "don't know which line input library to use." 
fi

echo "writing config.inc"
cat >config.inc <<EOF
PREFIX="${prefix}"
CC="${CC}"
CFLAGS="${CFLAGS}"
LDFLAGS="${LDFLAGS}"
WITH_MANUAL_JANET="${WITH_MANUAL_JANET}"
JANET_HEADER_CFLAGS="${JANET_HEADER_CFLAGS}"
WITH_PKGCONFIG_READLINE="${WITH_PKGCONFIG_READLINE}"
WITH_PKGCONFIG_LIBEDIT="${WITH_PKGCONFIG_LIBEDIT}"
WITH_READNOISE="${WITH_READNOISE}"
READLINE_CFLAGS="${READLINE_CFLAGS}"
READLINE_LDFLAGS="${READLINE_LDFLAGS}"
EOF

echo "configured with:"
cat config.inc

echo ""
echo configure SUCCESS