# vim:se syn=tcl:
#

# Note: modules which support options *must* be included before 'options'
use cc cc-shared

options {
    utf8            => "include support for utf8-encoded strings"
    lineedit=1      => "disable line editing"
    references=1    => "disable support for references"
    math            => "include support for math functions"
    ipv6            => "include ipv6 support in the aio extension"
    maintainer      => {enable the [debug] command and JimPanic}
    full            => "Enable some optional features: ipv6, math, utf8, binary, oo, tree"
    with-jim-shared shared => "build a shared library instead of a static library"
    jim-regexp      => "use the built-in (Tcl-compatible) regexp, even if POSIX regex is available"
    with-jim-ext: {with-ext:"ext1 ext2 ..."} => {
        Specify additional jim extensions to include.
        These are enabled by default:

        aio       - ANSI I/O, including open and socket
        eventloop - after, vwait, update
        array     - Tcl-compatible array command
        clock     - Tcl-compatible clock command
        exec      - Tcl-compatible exec command
        file      - Tcl-compatible file command
        glob      - Tcl-compatible glob command
        readdir   - Required for glob
        package   - Package management with the package command
        load      - Load binary extensions at runtime with load or package
        posix     - Posix APIs including os.fork, os.wait, pid
        regexp    - Tcl-compatible regexp, regsub commands
        signal    - Signal handling
        stdlib    - Built-in commands including lassign, lambda, alias
        syslog    - System logging with syslog
        tclcompat - Tcl compatible read, gets, puts, parray, case, ...

        These are disabled by default:

        nvp       - Name-value pairs C-only API
        oo        - Jim OO extension
        tree      - OO tree structure, similar to tcllib ::struct::tree
        binary    - Tcl-compatible 'binary' command
        readline  - Interface to libreadline
        rlprompt  - Tcl wrapper around the readline extension
        sqlite    - Interface to sqlite
        sqlite3   - Interface to sqlite3
        win32     - Interface to win32
    }
    with-out-jim-ext: {without-ext:"default|ext1 ext2 ..."} => {
        Specify jim extensions to exclude.
        If 'default' is given, the default extensions will not be added.
    }
    with-jim-extmod: {with-mod:"ext1 ext2 ..."} => {
        Specify jim extensions to build as separate modules (either C or Tcl).
        Note that not all extensions can be built as loadable modules.
    }
    # To help out openocd with automake
    install-jim=1
}

cc-check-types "long long"

cc-check-includes sys/socket.h netinet/in.h arpa/inet.h netdb.h
cc-check-includes sys/un.h dlfcn.h unistd.h crt_externs.h

cc-check-functions ualarm sysinfo lstat fork vfork system select
cc-check-functions backtrace geteuid mkstemp realpath strptime gettimeofday
cc-check-functions regcomp waitpid sigaction sys_signame sys_siglist
cc-check-functions syslog opendir readlink sleep usleep pipe inet_ntop getaddrinfo

define TCL_LIBRARY [get-define prefix]/lib/jim

lassign [split [get-define host] -] host_cpu host_vendor host_os
# Scrub revision from the host_os
regsub -all {[0-9.]} $host_os {} host_os

switch -glob -- $host_os {
    mingw* {
        # We provide our own implementation of dlopen for mingw32
        define-feature dlopen-compat
        define TCL_PLATFORM_OS $host_os
        define TCL_PLATFORM_PLATFORM windows
        define TCL_PLATFORM_PATH_SEPARATOR {;}
    }
    default {
        # Note that cygwin is considered a unix platform
        define TCL_PLATFORM_OS $host_os
        define TCL_PLATFORM_PLATFORM unix
        define TCL_PLATFORM_PATH_SEPARATOR :
    }
}

# Find some tools
cc-check-tools ar ranlib strip
define tclsh [info nameofexecutable]

if {![cc-check-functions _NSGetEnviron]} {
    msg-checking "Checking environ declared in unistd.h..."
    if {[cctest -cflags -D_GNU_SOURCE -includes unistd.h -code {char **ep = environ;}]} {
        define NO_ENVIRON_EXTERN
        msg-result "yes"
    } else {
        msg-result "no"
    }
}

# Windows has a mkdir with no permission arg
cc-check-includes sys/types.h sys/stat.h
msg-checking "Checking for mkdir with one arg..."
if {[cctest -includes {sys/types.h sys/stat.h} -code {mkdir("/dummy");}]} {
    define HAVE_MKDIR_ONE_ARG
    msg-result yes
} else {
    msg-result no
}

set extra_objs {}
set jimregexp 0

if {[opt-bool utf8 full]} {
    msg-result "Enabling UTF-8"
    define JIM_UTF8
    incr jimregexp
} else {
    define JIM_UTF8 0
}
if {[opt-bool maintainer]} {
    msg-result "Enabling maintainer settings"
    define JIM_MAINTAINER
}
if {[opt-bool math full]} {
    msg-result "Enabling math functions"
    define JIM_MATH_FUNCTIONS
    define-append LIBS -lm
}
if {[opt-bool ipv6 full]} {
    msg-result "Enabling IPv6"
    define JIM_IPV6
}
if {[opt-bool lineedit full] && [cc-check-includes termios.h] && [cc-check-functions isatty]} {
    msg-result "Enabling line editing"
    define USE_LINENOISE
    lappend extra_objs linenoise.o
    cc-check-functions isatty
}
if {[opt-bool references]} {
    msg-result "Enabling references"
    define JIM_REFERENCES
}
if {[opt-bool shared with-jim-shared]} {
    msg-result "Building shared library"
    define JIM_LIBTYPE shared
} else {
    msg-result "Building static library"
    define JIM_LIBTYPE static
}
if {[opt-bool install-jim]} {
    define install_jim 1
} else {
    define install_jim ""
}

# Note: Extension handling is mapped directly from the configure.ac
# implementation

set without [join [opt-val {without-ext with-out-jim-ext}]]
set withext [join [opt-val {with-ext with-jim-ext}]]
set withmod [join [opt-val {with-mod with-jim-extmod}]]

# Tcl extensions
set ext_tcl "stdlib glob tclcompat tree rlprompt oo binary"
# C extensions
set ext_c "load package readdir array clock exec file posix regexp signal aio eventloop pack syslog nvp readline sqlite sqlite3 win32"

# Tcl extensions which can be modules
set ext_tcl_mod "glob tree rlprompt oo binary"
# C extensions which can be modules
set ext_c_mod "readdir array clock file posix regexp syslog readline pack sqlite sqlite3 win32"

# All extensions
set ext_all [concat $ext_c $ext_tcl]

# Default static extensions
set ext_default "stdlib load package readdir glob array clock exec file posix regexp signal tclcompat aio eventloop syslog"

if {[opt-bool full]} {
    lappend ext_default tree binary
}

if {$without eq "default"} {
    set ext_default stdlib
    set without {}
}

# Check valid extension names
foreach i [concat $withext $without $withmod] {
    if {$i ni $ext_all} {
        user-error "Unknown extension: $i"
    }
}

# needs_xxx="expression" means that the expr must eval to 1 to select the extension
# dep_xxx="yyy zzz" means that if xxx is selected, so is yyy and zzz
set dep(glob) readdir
set dep(rlprompt) readline
set dep(tree) oo
set dep(binary) pack

set needs(aio) {expr {[cc-check-function-in-lib socket socket] || 1}}
set needs(exec) {expr {([have-feature vfork] && [have-feature waitpid]) || [have-feature system]}}
set needs(load) {expr {[cc-check-function-in-lib dlopen dl] || [have-feature dlopen-compat]}}
set needs(posix) {have-feature waitpid}
set needs(readdir) {have-feature opendir}
set needs(readline) {cc-check-function-in-lib readline readline}
set needs(signal) {expr {[have-feature sigaction] && [have-feature vfork]}}
set needs(sqlite) {cc-check-function-in-lib sqlite_open sqlite}
set needs(sqlite3) {cc-check-function-in-lib sqlite3_open sqlite3}
set needs(syslog) {have-feature syslog}
set needs(eventloop) {expr {[have-feature select] || [have-feature usleep]}}
set needs(win32) {have-feature windows}

# First handle dependencies. If an extension is enabled, also enable its dependency
foreach i [concat $ext_default $withext] {
    if {$i in $without} {
        continue
    }
    if {[info exists dep($i)]} {
        lappend withext {*}$dep($i)
    }
}

foreach i $withmod {
    if {[info exists dep($i)]} {
        # Theoretically, a mod could depend upon something which must be static
        # If already configured static, don't make it a module
        foreach d $dep($i) {
            if {$d ni $withext} {
                lappend withmod $d
            }
        }
    }
}

# Now that we know what the platform supports:

# For all known extensions:
# - If it is disabled, remove it
# - Otherwise, check to see if it's pre-requisites are met
# -   If yes, add it if it is enabled or is a default
# -   If no, error if it is enabled, or do nothing otherwise
# - Modules may be either C or Tcl

set extmodtcl {}
set extmod {}
set ext {}

foreach i [lsort $ext_all] {
    # First discard the extension if disabled or not enabled
    if {$i in $without} {
        msg-result "Extension $i...disabled"
        continue
    }
    if {$i ni [concat $withext $withmod $ext_default]} {
        msg-result "Extension $i...not enabled"
        continue
    }

    # Check dependencies
    set met 1
    if {[info exists needs($i)]} {
        set met [eval $needs($i)]
    }

    msg-checking "Extension $i..."

    # Selected as a module?
    if {$i in $withmod} {
        if {$i in $ext_tcl_mod} {
            # Easy, a Tcl module
            msg-result "tcl"
            lappend extmodtcl $i
            continue
        }
        if {$i ni $ext_c_mod} {
            user-error "not a module"
        }
        if {!$met} {
            user-error "dependencies not met"
        }
        msg-result "module"
        lappend extmod $i
        continue
    }

    # Selected as a static extension?
    if {$i in $withext} {
        if {!$met} {
            user-error "dependencies not met"
        }
        msg-result "enabled"
        lappend ext $i
        continue
    }

    # Enabled by default?
    if {$i in $ext_default} {
        if {!$met} {
            msg-result "disabled (dependencies)"
            continue
        }
        msg-result "enabled (default)"
        lappend ext $i
        continue
    }
}

if {[have-feature windows]} {
    lappend extra_objs jim-win32compat.o

    if {$extmod ne "" && [get-define JIM_LIBTYPE] eq "static"} {
        user-error "cygwin/mingw require --shared for dynamic modules"
    }
}

if {"regexp" in "$ext $extmod"} {
    # No regcomp means we need to use the built-in version
    if {![have-feature regcomp]} {
        incr jimregexp
    }
}

if {$jimregexp || [opt-bool jim-regexp]} {
    msg-result "Using built-in regexp"
    define JIM_REGEXP

    # If the built-in regexp overrides the system regcomp, etc.
    # jim must be built shared so that the correct symbols are found
    if {"regexp" in $extmod && [get-define JIM_LIBTYPE] eq "static" && [have-feature regcomp]} {
        user-error "Must use --shared with regexp module and built-in regexp"
    }
}
if {"load" ni $ext} {
    # If we don't have load, no need to support shared objects
    define SH_LINKFLAGS ""
}

msg-result "Jim static extensions: [lsort $ext]"
if {$extmodtcl ne ""} {
    msg-result "Jim Tcl extensions: [lsort $extmodtcl]"
}
if {$extmod ne ""} {
    msg-result "Jim dynamic extensions: [lsort $extmod]"
}

# Separate out the static extensions into C and Tcl
set ext_static_c {}
set ext_static_tcl {}
foreach e $ext {
    define jim_ext_$e
    if {$e in $ext_tcl} {
        lappend ext_static_tcl $e
    } else {
        lappend ext_static_c $e
    }
}

define JIM_STATIC_C_EXTS $ext_static_c
define JIM_STATIC_TCL_EXTS $ext_static_tcl
define JIM_TCL_EXTENSIONS $extmodtcl
define JIM_MOD_EXTENSIONS $extmod
define EXTRA_OBJS $extra_objs

make-config-header jim-config.h -auto {HAVE_LONG_LONG* JIM_UTF8} -none *
make-config-header jimautoconf.h -auto {jim_ext_* TCL_PLATFORM_* TCL_LIBRARY USE_* JIM_*}
make-template Makefile.in