#!/bin/bash

# A basic installation script for Lua.

# Defaults

PREFIX="/usr/local"
LUA_SUFFIX=""
BUILD_LUA="yes"
INSTALL_LUA="yes"
USE_READLINE="yes"
NCURSES_DIR="/usr"
READLINE_DIR="/usr"
LUA_DIR="/usr"
LUA_INCDIR="/usr/include"
LUA_LIBDIR="/usr/lib"
LUA_BINDIR="/usr/bin"

UNAME="`uname`"

if ! [ "$UNAME" = "Linux" -o "$UNAME" = "Darwin" -o "$UNAME" = "FreeBSD" ]
then
   USE_READLINE=no
fi

LUA_VERSION=5.1.2
EASYLUA_VERSION=0.1

# Help

show_help() {
cat <<EOF
Easy Lua $LUA_VERSION Installer version $EASYLUA_VERSION.

--help                      This help.
--prefix=DIR                Prefix where Lua should be installed.
                            Default is $PREFIX
--include-dir=DIR           Prefix where C header files should be installed.
                            Default is \$(PREFIX)/include
--lua-suffix=SUFFIX         Versioning suffix to use in Lua filenames.
                            (lua vs. lua5.1, liblua.a vs. liblua5.1.a...)
--with-readline=DIR         Prefix where Readline is installed.
                            Used by Lua.
                            Default is $READLINE_DIR
--with-ncurses=DIR          Prefix where NCurses is installed.
                            Used by Lua when Readline is enabled.
                            Default is $NCURSES_DIR
--without-readline          Disable Readline support when building Lua.

EOF
}

# Parse options

while [ "$1" ]
do
   value="`echo $1 | sed 's/.*=\(.*\)/\1/'`"
   if echo "$value" | grep -q "~"
   then
      echo
      echo '*WARNING*: the "~" sign is not expanded in flags.'
      echo 'If you mean the home directory, use $HOME instead.'
      echo
      exit 1
   fi
   case "$1" in
   --help)
      show_help
      exit 0
      ;;
   --prefix=*)
      PREFIX="$value"
      PREFIX_SET=yes
      ;;
   --include-dir=*)
      INCLUDEDIR="$value"
      INCLUDEDIR_SET=yes
      ;;
   --lua-suffix=*)
      LUA_SUFFIX="$value"
      LUA_SUFFIX_SET=yes
      ;;
   --with-readline=*)
      READLINE_DIR="$value"
      USE_READLINE=yes
      ;;
   --with-ncurses=*)
      NCURSES_DIR="$value"
      ;;
   --without-readline)
      USE_READLINE=no
      ;;
   *)
      echo "Error: Unknown flag: $1"
      exit 1
      ;;
   esac
   shift
done

echo "Easy Lua $LUA_VERSION Installer version $EASYLUA_VERSION."

if ! [ "$INCLUDEDIR_SET" = "yes" ]
then
   INCLUDEDIR="$PREFIX/include"
fi

LUA_DIR="$PREFIX"
LUA_INCDIR="$INCLUDEDIR"
LUA_LIBDIR="$LUA_DIR/lib"
LUA_BINDIR="$LUA_DIR/bin"

# External dependencies

test_package() {
   package_keyword="$1"
   package_name="$2"
   with_flag="$3"
   shift 3
   if echo "$OPTIONAL_PACKAGES" | grep -q "$package_keyword"
   then
      echo -n "Checking $package_name... "
      tried=""
      while [ "$1" ]
      do
         test_file="$1"
         if [ -e "$test_file" ]
         then
            echo "found: $test_file"
            return 0
         fi
         tried="$tried $1"
         shift
      done
      echo "not found:$tried"
      echo
      echo "Error: Could not verify the presence of $package_name."
      echo "You may need to install development packages for $package_name."
      if [ "$with_flag" ]
      then
         echo "If you are sure they are installed,"
         echo "you can supply their location with $with_flag."
      fi
      echo "See --help for details."
      exit 1
   fi
}

if [ "$USE_READLINE" = "yes" ]
then
   test_package "" "Readline" --with-readline $READLINE_DIR/include/readline/readline.h
   if [ "$UNAME" = "Linux" ]
   then 
      test_package "" "NCurses" --with-ncurses $NCURSES_DIR/include/ncurses.h
   fi
fi

mkdir -p /tmp/easylua-$EASYLUA_VERSION && pushd /tmp/easylua-$EASYLUA_VERSION

cat <<EOF > Makefile
# This file was automatically generated by the configure script.
# Run "./configure --help" for details.
BUILD_LUA=$BUILD_LUA
INSTALL_LUA=$INSTALL_LUA
USE_READLINE=$USE_READLINE

PREFIX=$PREFIX
INCLUDEDIR=$INCLUDEDIR
LUA_SUFFIX=$LUA_SUFFIX

READLINE_DIR=$READLINE_DIR
NCURSES_DIR=$NCURSES_DIR

LUA_DIR=$LUA_DIR
LUA_INCDIR=$LUA_INCDIR
LUA_LIBDIR=$LUA_LIBDIR
LUA_BINDIR=$LUA_BINDIR

LUA_URL=http://www.lua.org/ftp

READLINE_LIBDIR=\$(READLINE_DIR)/lib
READLINE_INCLUDEDIR=\$(READLINE_DIR)/include

NCURSES_LIBDIR=\$(NCURSES_DIR)/lib
NCURSES_INCLUDEDIR=\$(NCURSES_DIR)/include

LUA_VERSION=$LUA_VERSION

PLATFORM_CFLAGS=-Wl,-E
PLATFORM_LDFLAGS=-lm -ldl
LIB_FLAG=-shared

ifeq (\$(shell uname -m | sed 's/i.86/i386/'),i386)
   FPIC=
else
   FPIC=-fpic
endif

LUA_LIB=\$(LUA_LIBDIR)/liblua\$(LUA_SUFFIX).a
LUA_DEFPATH=-DLUA_ROOT=\\\\\\"\$(LUA_DIR)\\\\\\"
ifeq (\$(USE_READLINE), yes)
   LUA_READLINE_CFLAGS=-DLUA_USE_READLINE -I\$(READLINE_INCLUDEDIR)
   LUA_READLINE_LIBS=-lreadline -lhistory -lncurses -L\$(READLINE_LIBDIR) -L\$(NCURSES_LIBDIR)
else
   LUA_READLINE_CFLAGS=
   LUA_READLINE_LIBS=
endif
LUA_MYCFLAGS=-DLUA_USE_POSIX -DLUA_USE_DLOPEN \$(LUA_READLINE_CFLAGS)
LUA_MYLIBS=\$(PLATFORM_CFLAGS) -ldl \$(LUA_READLINE_LIBS)

WGET=wget -c -t0

PLATFORM_BUILD=build

ifeq (\$(shell bash -c 'echo $${OSTYPE%%[0-9]*}'),darwin)
   PLATFORM_BUILD=OSX-build
   ifneq (\$(LUA_READLINE_LIBS),)
      LUA_READLINE_LIBS=-lreadline -L\$(READLINE_LIBDIR)
   endif
endif
ifeq (\$(shell uname -s),FreeBSD)
   PLATFORM_BUILD=FreeBSD-build
endif

platform: \$(PLATFORM_BUILD)

OSX-build:
	MACOSX_DEPLOYMENT_TARGET=10.3 \$(MAKE) \\
	   LUA_MYCFLAGS="-DLUA_USE_MACOSX \$(LUA_READLINE_CFLAGS)" \\
	   LUA_MYLIBS="\$(LUA_READLINE_LIBS)" \\
	   PLATFORM_CFLAGS="-dynamic" \\
	   PLATFORM_LDFLAGS="-lm -ldl" \\
	   LIB_FLAG="-bundle -undefined dynamic_lookup -all_load" \\
	   build

FreeBSD-build:
	\$(MAKE) \\
	   LUA_MYCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" \\
	   LUA_MYLIBS="-Wl,-E" \\
	   PLATFORM_LDFLAGS="-lm" \\
	   build

LUA_TESTFILE=lua-\$(LUA_VERSION)/src/lua\$(LUA_SUFFIX)

fetch: lua-\$(LUA_VERSION)

lua-\$(LUA_VERSION).tar.gz:
	\$(WGET) \$(LUA_URL)/\$@

lua-\$(LUA_VERSION):
	\$(MAKE) lua-\$(LUA_VERSION).tar.gz
	test -d \$@ || tar zxvpf lua-\$(LUA_VERSION).tar.gz
	cd lua-\$(LUA_VERSION) && patch -p1 < ../lua-\$(LUA_VERSION)-easylua.diff

build: \$(LUA_TESTFILE)

\$(LUA_TESTFILE): lua-\$(LUA_VERSION)
	cd lua-\$(LUA_VERSION) && \$(MAKE) \\
	   LUA_SUFFIX="\$(LUA_SUFFIX)" \\
	   INSTALL_INC="\$(LUA_INCDIR)" \\
	   MYCFLAGS="\$(LUA_DEFPATH) \$(LUA_MYCFLAGS)" \\
	   MYLIBS="\$(LUA_MYLIBS)" \\
	   CC="\$(CC)" \\
	   generic

install: build
	cd lua-\$(LUA_VERSION) && \$(MAKE) \\
	   LUA_SUFFIX="\$(LUA_SUFFIX)" \\
	   INSTALL_INC="\$(LUA_INCDIR)" \\
	   INSTALL_TOP="\$(LUA_DIR)" \\
	   MYCFLAGS="\$(LUA_MYCFLAGS)" \\
	   MYLIBS="\$(LUA_MYLIBS)" \\
	   INSTALL_EXEC="install -p -m 0755" \\
	   INSTALL_DATA="install -p -m 0644" \\
	   STRIP="true" \\
	   install

clean:
	if [ -d lua-\$(LUA_VERSION) ]; then \\
	   cd lua-\$(LUA_VERSION) && \$(MAKE) \\
	      LUA_SUFFIX="\$(LUA_SUFFIX)" \\
	      clean; \\
	fi

klean:
	rm -f lua-\$(LUA_VERSION).tar.gz
	rm -rf lua-\$(LUA_VERSION)
	rm -f Makefile
	rm -f lua-\$(LUA_VERSION)-easylua.diff

EOF

cat <<EOF > lua-5.1.2-easylua.diff
diff -Naur lua-5.1.2-orig/Makefile lua-5.1.2/Makefile
--- lua-5.1.2-orig/Makefile	2007-03-25 11:44:39.000000000 -0300
+++ lua-5.1.2/Makefile	2007-05-11 16:08:02.000000000 -0300
@@ -41,10 +41,10 @@
 PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
 
 # What to install.
-TO_BIN= lua luac
+TO_BIN= lua\$(LUA_SUFFIX) luac\$(LUA_SUFFIX)
 TO_INC= lua.h luaconf.h lualib.h lauxlib.h ../etc/lua.hpp
-TO_LIB= liblua.a
-TO_MAN= lua.1 luac.1
+TO_LIB= liblua\$(LUA_SUFFIX).a
+TO_MAN= lua\$(LUA_SUFFIX).1 luac\$(LUA_SUFFIX).1
 
 # Lua version and release.
 V= 5.1
@@ -56,13 +56,17 @@
 	cd src && \$(MAKE) \$@
 
 test:	dummy
-	src/lua test/hello.lua
+	src/lua\$(LUA_SUFFIX) test/hello.lua
 
 install: dummy
 	cd src && \$(MKDIR) -p \$(INSTALL_BIN) \$(INSTALL_INC) \$(INSTALL_LIB) \$(INSTALL_MAN) \$(INSTALL_LMOD) \$(INSTALL_CMOD)
 	cd src && \$(INSTALL_EXEC) \$(TO_BIN) \$(INSTALL_BIN)
 	cd src && \$(INSTALL_DATA) \$(TO_INC) \$(INSTALL_INC)
 	cd src && \$(INSTALL_DATA) \$(TO_LIB) \$(INSTALL_LIB)
+	cp doc/lua.1 doc/t_lua.1
+	cp doc/luac.1 doc/t_luac.1
+	mv doc/t_lua.1 doc/lua\$(LUA_SUFFIX).1
+	mv doc/t_luac.1 doc/luac\$(LUA_SUFFIX).1
 	cd doc && \$(INSTALL_DATA) \$(TO_MAN) \$(INSTALL_MAN)
 #	\$(RANLIB) \$(INSTALL_LIB)/\$(TO_LIB)
 
diff -Naur lua-5.1.2-orig/src/luaconf.h lua-5.1.2/src/luaconf.h
--- lua-5.1.2-orig/src/luaconf.h	2007-03-24 00:01:55.000000000 -0300
+++ lua-5.1.2/src/luaconf.h	2007-05-11 16:12:55.000000000 -0300
@@ -94,9 +94,11 @@
 	".\\\\?.dll;"  LUA_CDIR"?.dll;" LUA_CDIR"loadall.dll"
 
 #else
-#define LUA_ROOT	"/usr/local/"
-#define LUA_LDIR	LUA_ROOT "share/lua/5.1/"
-#define LUA_CDIR	LUA_ROOT "lib/lua/5.1/"
+#ifndef LUA_ROOT
+#define LUA_ROOT	"/usr/local"
+#endif
+#define LUA_LDIR	LUA_ROOT "/share/lua/5.1/"
+#define LUA_CDIR	LUA_ROOT "/lib/lua/5.1/"
 #define LUA_PATH_DEFAULT  \\
 		"./?.lua;"  LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \\
 		            LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua"
diff -Naur lua-5.1.2-orig/src/Makefile lua-5.1.2/src/Makefile
--- lua-5.1.2-orig/src/Makefile	2007-03-25 11:49:23.000000000 -0300
+++ lua-5.1.2/src/Makefile	2007-05-11 16:08:02.000000000 -0300
@@ -22,17 +22,17 @@
 
 PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
 
-LUA_A=	liblua.a
+LUA_A=	liblua\$(LUA_SUFFIX).a
 CORE_O=	lapi.o lcode.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o \\
 	lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o  \\
 	lundump.o lvm.o lzio.o
 LIB_O=	lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o \\
 	lstrlib.o loadlib.o linit.o
 
-LUA_T=	lua
+LUA_T=	lua\$(LUA_SUFFIX)
 LUA_O=	lua.o
 
-LUAC_T=	luac
+LUAC_T=	luac\$(LUA_SUFFIX)
 LUAC_O=	luac.o print.o
 
 ALL_O= \$(CORE_O) \$(LIB_O) \$(LUA_O) \$(LUAC_O)
@@ -93,7 +93,7 @@
 	\$(MAKE) all MYCFLAGS="-DLUA_USE_LINUX" MYLIBS="-Wl,-E -lreadline"
 
 generic:
-	\$(MAKE) all MYCFLAGS=
+	\$(MAKE) all
 
 linux:
 	\$(MAKE) all MYCFLAGS=-DLUA_USE_LINUX MYLIBS="-Wl,-E -ldl -lreadline -lhistory -lncurses"

EOF

echo "Installing Lua on $PREFIX"

if [ "`uname -s`" = "FreeBSD" ]
then
   MAKE=gmake
else
   MAKE=make
fi

$MAKE clean > /dev/null 2> /dev/null

$MAKE

$MAKE install

echo
echo "Done. Lua is installed on $PREFIX."
echo

echo
echo "Cleaning up..."
echo

popd && rm -rf /tmp/easylua-$EASYLUA_VERSION