#!/bin/bash
#
# Copyright (c) 2011-2012 Ryan Prichard
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.

#
# findTool(desc, commandList)
#
# Searches commandLine for the first command in the PATH and returns it.
# Prints an error and aborts the script if no match is found.
#
FINDTOOL_OUT=""
function findTool {
    DESC=$1
    OPTIONS=$2
    for CMD in ${OPTIONS}; do
        if (which $CMD &>/dev/null) then
            echo "Found $DESC: $CMD"
            FINDTOOL_OUT="$CMD"
            return
        fi
    done
    echo "Error: could not find $DESC.  One of these should be in your PATH:"
    for CMD in ${OPTIONS}; do
        echo " * $CMD"
    done
    exit 1
}

IS_CYGWIN=0
IS_MSYS=0

# Detect the environment -- Cygwin or MSYS.
case $(uname -s) in
    CYGWIN*)
        echo 'uname -s identifies a Cygwin environment.'
        IS_CYGWIN=1
	    case $(uname -m) in
            i686)
                echo 'uname -m identifies a i686 environment.'
                UNIX_GPP=i686-pc-cygwin-g++
                MINGW_GPP="i686-pc-mingw32-g++ i686-w64-mingw32-g++"
                ;;
            x86_64)
                echo 'uname -m identifies a x86_64 environment.'
                UNIX_GPP=x86_64-pc-cygwin-g++
                MINGW_GPP="x86_64-pc-mingw32-g++ x86_64-w64-mingw32-g++"
                ;;
            *)
                echo 'Error: uname -m did not match either i686 or x86_64.'
                exit 1
                ;;
	    esac
        UNIX_LDFLAGS_STATIC_LIBSTDCXX="-static-libgcc -static-libstdc++"
        ;;
    MINGW*)
        echo 'uname -s identifies a MSYS environment.'
        IS_MSYS=1
        UNIX_GPP=i686-pc-msys-g++
        MINGW_GPP=mingw32-g++
        # The MSYS compiler does not recognize -static-libstdc++.  There is a
        # msys-1.0.dll, but no gcc or stdc++ DLL.
        UNIX_LDFLAGS_STATIC_LIBSTDCXX=
        ;;
    *)
        echo 'Error: uname -s did not match either CYGWIN* or MINGW*.'
        exit 1
        ;;
esac

# Search the PATH and pick the first match.
findTool "Cygwin/MSYS G++ compiler" "$UNIX_GPP"
UNIX_GPP=$FINDTOOL_OUT
findTool "32-bit MinGW G++ compiler" "$MINGW_GPP"
MINGW_GPP=$FINDTOOL_OUT

# Write config files.
echo Writing config-unix.mk
echo CXX=$UNIX_GPP > config-unix.mk
echo LDFLAGS_STATIC_LIBSTDCXX=$UNIX_LDFLAGS_STATIC_LIBSTDCXX >> config-unix.mk
echo Writing config-mingw.mk
echo CXX=$MINGW_GPP > config-mingw.mk