AC_INIT([open_pdks], [1.0], [github.com/RTimothyEdwards/open_pdks])

# detect PDKs based on directories that include Makefile.in files
m4_define([M4_GET_TECHS], [m4_normalize(m4_esyscmd(cd .. && find * -mindepth 1 -maxdepth 1 -name "Makefile.in" -exec dirname {} \; | tr "\n" " "))])

# define tools
# define tools to install setup files for.  This does not imply that the tools are
# available on the system;  just that open_pdks will install the setup files for them.
## DO NOT INCLUDE XSCHEM IN THE TOOL LIST. XSCHEM CAN BE INSTALLED IN THE CONFIG SCRIPT
m4_define([M4_GET_TOOLS], [m4_normalize(m4_esyscmd(cat ./tools.txt | tr "\n" " "))])

mkdir -p ../pdks

# check for the source and install paths for each PDK.
AC_DEFUN([M4_GEN_WITH_PDK_ARGS], [

    # --enable-pdk-[pdk]=/path/to/pdk
    m4_foreach_w(pdk, $1, [
        m4_define([pdkvar], [m4_normalize(m4_esyscmd(echo pdk | tr "a-z" "A-Z"))])

        pdkvar[]_SOURCE_PATH=""
        pdkvar[]_LOCAL_PATH=""
        pdkvar[]_DIST_PATH=""
        pdkvar[]_LINK_TARGETS="none"

        pdk_get() {
            AC_CHECK_FILE(../pdk/[pdk]_info, [
                AC_CHECK_FILE(../pdks/pdk,[
                    echo "Using pre-existing pdk download..."
                ], [
                    REPO=$(cat "../pdk/pdk_info" | sed -n "1p")
                    POST_CLONE_COMMANDS=$(cat "../pdk/pdk_info" | sed "1d")
                    mkdir -p ../pdks
                    git clone "$REPO" ../pdks/pdk;
                    (cd ../pdks/pdk && sh -c "$POST_CLONE_COMMANDS")
                ])
                export pdkvar[]_SOURCE_PATH=../pdks/pdk
            ], [
                AC_MSG_ERROR([PDK pdk cannot be automatically downloaded and requires a path.])
            ])
        }

        pdk_find() {
            FOUND=0
            for path in /opt/pdks/pdk /usr/share/pdks/pdk /usr/local/share/pdks/pdk; do
                if @<:@ -d $path @:>@ ; then
                    echo "Found pdk in $path, using this installation..."
                    export pdkvar[]_SOURCE_PATH=$path
                    FOUND=1
                fi
            done
            if @<:@ "$FOUND" = "$1" @:>@; then
                echo "Could not found pdk in standard search paths, manually downloading to ../pdks/pdk ..."
                pdk_find
            fi
        }

        AC_ARG_ENABLE(pdk-[pdk],
            [AS_HELP_STRING([--enable-pdk-[pdk]=@<:@/path/to/pdk/@:>@ --disable-pdk-[pdk]], "location of the source files for the pdk (pdks with a [pdk]_url file can automatically download them if the path is omitted)")],
            [
                if test "$enableval" == "yes" -o "$enableval" == "YES"; then
                   pdk_find
                elif test "$enableval" == "no" -o "$enableval" == "NO"; then
                    echo "Disabling pdk..."
                else
                    export pdkvar[]_SOURCE_PATH=$enableval
                fi
            ], [
                pdk_find
            ]
        )
	    # # Require this argument
        # AC_MSG_NOTICE([Checking whether source path is specified for 'pdk'])
        # if test "x$[]pdkvar[]_SOURCE_PATH" == "x" ; then
        #     AC_MSG_ERROR([Option --with-pdk-source=<path> not specified!])
        # fi

        if @<:@ "$[]pdkvar[]_SOURCE_PATH" != "" @:>@; then
            pdkvar[]_SOURCE_PATH=`readlink -f $[]pdkvar[]_SOURCE_PATH`

            # basic check that the PDK exists there (the path must exist in any case)
            AC_MSG_NOTICE([Checking specified path for 'pdk' at $pdkvar[]_SOURCE_PATH])
            AC_CHECK_FILE($pdkvar[]_SOURCE_PATH,[
                AC_MSG_NOTICE(['pdk' source path found at $pdkvar[]_SOURCE_PATH])
            ], [
                AC_MSG_ERROR([Specified path for 'pdk' at $pdkvar[]_SOURCE_PATH not found])
            ])

            # --with-pdk-local-path=PDK_LOCAL_PATH
            AC_ARG_WITH(pdk-local-path,
                [AS_HELP_STRING([--with-pdk-local-path=/path/to/install/pdk], "run-time location of the PDK")],
                [pdkvar[]_LOCAL_PATH=$withval]
            )
            
            # Require this argument
            AC_MSG_NOTICE([Checking whether local path is specified for 'pdk'])
            if test "x$[]pdkvar[]_LOCAL_PATH" == "x" ; then
                AC_MSG_ERROR([Option --with-pdk-local-path=<path> not specified!])
                pdkvar[]_LOCAL_PATH=""
            else
                pdkvar[]_LOCAL_PATH=`readlink -f $[]pdkvar[]_LOCAL_PATH`
            fi

            # --with-pdk-dist-path=PDK_DIST_PATH
            AC_ARG_WITH(pdk-dist-path,
                [AS_HELP_STRING([--with-pdk-dist-path=/path/to/install/pdk], "staging location to install the PDK for distribution (optional)")],
                [pdkvar[]_DIST_PATH=$withval]
            )

            
            # "Require" this argument
            AC_MSG_NOTICE([Checking whether distribution path is specified for 'pdk'])
            if test "x$[]pdkvar[]_DIST_PATH" == "x" ; then
                AC_MSG_NOTICE([Option --with-pdk-dist-path=<path> not specified.  Local install only.])
                pdkvar[]_DIST_PATH=""
            else
                pdkvar[]_DIST_PATH=`readlink -f $[]pdkvar[]_DIST_PATH`
            fi

            # --with-pdk-link-targets=PDK_LINK_TARGETS
            AC_ARG_WITH(pdk-link-targets,
                [AS_HELP_STRING([--with-pdk-link-targets=none|source], "make symbolic links to existing files @<:@default=none@:>@")],
                [[]pdkvar[]_LINK_TARGETS=$with_[]pdk[]_link_targets]
            )
            AC_SUBST([]pdkvar[]_LINK_TARGETS)
            AC_MSG_NOTICE([Link targets set to $pdkvar[]_LINK_TARGETS])
        fi

        AC_SUBST(pdkvar[]_SOURCE_PATH)
        AC_SUBST(pdkvar[]_LOCAL_PATH)
        AC_SUBST(pdkvar[]_DIST_PATH)
        AC_SUBST(pdkvar[]_LINK_TARGETS)
    ])
])

AC_MSG_NOTICE([Found technology directories: M4_GET_TECHS()])

M4_GEN_WITH_PDK_ARGS(M4_GET_TECHS())

# Set variables for tool setups
AC_DEFUN([M4_GEN_WITH_TOOLS], [
    m4_foreach_w(tool, $1, [
        m4_define([toolvar], [m4_normalize(m4_esyscmd(echo tool | tr "a-z" "A-Z"))])

        toolvar[]_DISABLED=0
        AC_ARG_ENABLE(tool,
            AS_HELP_STRING(
                --enable-tool
                Enable or disable tool @<:@default=enabled@:>@
            ), [
                if test "$enableval" == "no" -o "$enableval" == "NO"; then
                    toolvar[]_DISABLED=1
                fi
            ]
        )
        AC_SUBST(toolvar[]_DISABLED)
    ])
])

AC_MSG_NOTICE([Found tools: M4_GET_TOOLS()])

M4_GEN_WITH_TOOLS(M4_GET_TOOLS())

# Magic
AC_PATH_PROG(MAGIC, magic)
if test -z "$MAGIC"; then
   AC_MSG_ERROR([You need 'magic' to generate the needed various cell views.])
fi

# Other installations (libraries or tools if applicable)
mkdir -p ../libs
mkdir -p ../tools
AC_DEFUN([M4_GEN_INSTALLATION], [
    m4_define([target], $1)
    m4_define([targetvar], [m4_normalize(m4_esyscmd(echo target | tr "a-z" "A-Z"))])
    m4_define([flag], $2)
    m4_define([url], $3)
    m4_define([location], $4)

    # echo target targetvar flag url location

    targetvar[]_PATH=""
    targetvar[]_GET() {
        AC_CHECK_FILE(
            location/target,
            [
                echo "Using pre-existing target download..."
            ], [
                mkdir -p location/target
                sh ./download.sh url location/target.tar.gz
                (echo "Extracting target..." && cd location && tar -xf target.tar.gz --strip-components 1 -C location/target)
            ]
        )
        export targetvar[]_PATH=location/target
    }

    AC_ARG_ENABLE(
        flag,
        AS_HELP_STRING(
            [--enable-flag@<:@=path@:>@],
            [Install target. If path is omitted, it'll be downloaded. @<:@default=disabled@:>@]
        ), [
            if test "$enableval" == "yes" -o "$enableval" == "YES"; then
                targetvar[]_GET
                XSCHEM_INST=1
            elif test "$enableval" == "no" -o "$enableval" == "NO"; then
                echo "Disabling target..."
                XSCHEM_DISABLED=1
            else
                targetvar[]_PATH=$enableval
            fi
            targetvar[]_PATH=`readlink -f $[]targetvar[]_PATH`
        ],
        []
    )

    $5

    AC_SUBST(targetvar[]_PATH)
])

M4_GEN_INSTALLATION(osu, osu-lib, 'https://vlsiarch.ecen.okstate.edu/flows/MOSIS_SCMOS/osu_stdcells_v2.4/osu_stdcells_lib.v2.4.tar.gz', ../libs)
M4_GEN_INSTALLATION(sky130_ml_xx_hd, alpha-lib, 'https://github.com/PaulSchulz/sky130_pschulz_xx_hd/archive/master.tar.gz', ../libs)

XSCHEM_DISABLED=0
XSCHEM_INST=0
M4_GEN_INSTALLATION(xschem, xschem, 'https://github.com/StefanSchippers/xschem/archive/master.tar.gz', ../tools, [
    if @<:@ "$XSCHEM_INST" = 1 @:>@; then
        AC_CHECK_FILE(../tools/xschem-install,[
            echo "Using pre-existing xschem installation..."
        ], [
            echo "---"
            echo "Note: attempting to build xschem. Xschem requires all of Magic's dependencies and further, flex, bison and libxpm."
            echo "Your build WILL fail if any of these are missing. You can choose to remove --enable-xschem or add a known installation path."
            sleep 2
            mkdir -p ../tools/xschem-install
            XSCHEM_ABSOLUTE=`readlink -f ../tools/xschem-install`
            (cd ../tools/xschem && ./configure --prefix=$XSCHEM_ABSOLUTE && make && make install)
            XSCHEM_PATH=$XSCHEM_ABSOLUTE
        ])
    fi
])

AC_DEFUN([M4_GEN_WITH_TOOLS], [
    m4_foreach_w(tool, $1, [
        m4_define([toolvar], [m4_normalize(m4_esyscmd(echo tool | tr "a-z" "A-Z"))])

        toolvar[]_DISABLED=0
        AC_ARG_ENABLE(tool,
            AS_HELP_STRING(
                --enable-tool --disable-tool,
                Enable or disable tool @<:@default=enabled@:>@
            ),
            [
                if test "$enableval" == "no" -o "$enableval" == "NO"; then
                    toolvar[]_DISABLED=1
                fi
            ],
        )
        AC_SUBST(toolvar[]_DISABLED)
    ])
])

AC_MSG_NOTICE([Tools enabled for PDK setup installation: M4_GET_TOOLS()])

M4_GEN_WITH_TOOLS(M4_GET_TOOLS())

# Checking if (some) prerequisites are satisfied
## REQUIRES: https://www.gnu.org/software/autoconf-archive/ax_python_module.html#ax_python_module
AM_PATH_PYTHON([3.4])
AX_PYTHON_MODULE([distutils],[])

# Check for "--with-ef-style"
EF_STYLE=0
AC_ARG_WITH(
    [ef-style],
    AS_HELP_STRING(
        [--with-ef-style],
        [Use efabless style file system structure @<:@default=no@:>@]
    ), [
        pdks_ef_style=$withval
        if test "$withval" == "yes" -o "$withval" == "YES"; then
            EF_STYLE=1
        fi
    ],
)

AC_SUBST(EF_STYLE)

MAKEFILES=$(find .. -name "Makefile.in" | sed 's/\(.*\)\.in/\1/g')
AC_CONFIG_FILES($MAKEFILES)

AC_OUTPUT

AC_MSG_RESULT(Build configured successfully)