import modules ;
import option ;
import os ;
import path ;
import project ;
import build-system ;
import version ;

#Shell with trailing line removed http://lists.boost.org/boost-build/2007/08/17051.php
rule trim-nl ( str extras * ) {
return [ MATCH "([^
]*)" : $(str) ] $(extras) ;
}
rule _shell ( cmd : extras * ) {
  return [ trim-nl [ SHELL $(cmd) : $(extras) ] ] ;
}

rule shell_or_fail ( cmd ) {
  local ret = [ SHELL $(cmd) : exit-status ] ;
  if $(ret[2]) != 0 {
    exit $(cmd) failed : 1 ;
  }
}

cxxflags = [ os.environ "CXXFLAGS" ] ;
cflags = [ os.environ "CFLAGS" ] ;
ldflags = [ os.environ "LDFLAGS" ] ;

#Run g++ with empty main and these arguments to see if it passes.  
rule test_flags ( flags * ) {
  flags = $(cxxflags) $(ldflags) $(flags) ;
  local cmd = "bash -c \"g++ "$(flags:J=" ")" -x c++ - <<<'int main() {}' -o /dev/null >/dev/null 2>/dev/null\"" ;
  local ret = [ SHELL $(cmd) : exit-status ] ;
  if --debug-configuration in [ modules.peek : ARGV ] {
    echo $(cmd) ;
    echo $(ret) ;
  }
  if $(ret[2]) = 0 {
    return true ;
  } else {
    return ;
  }
}

rule test_header ( name ) {
  return [ test_flags "-include $(name)" ] ;
}

rule test_library ( name ) {
  return [ test_flags "-l$(name)" ] ;
}

{
  local cleaning = [ option.get "clean" : : yes ] ;
  cleaning ?= [ option.get "clean-all" : no : yes ] ;
  if "clean" in [ modules.peek : ARGV ] {
    cleaning = yes ;
  }
  constant CLEANING : $(cleaning) ;
}

requirements = ;

FORCE-STATIC = [ option.get "static" : : "yes" ] ;
if $(FORCE-STATIC) {
  requirements += <runtime-link>static ;
}

#Determine if a library can be compiled statically.  
rule auto-shared ( name : additional * ) {
  additional ?= "" ;
  if [ test_flags $(additional)" -static -l"$(name) ] {
    return ;
  } else {
    if $(FORCE-STATIC) {
      echo "Could not statically link against lib $(name).  Your build will probably fail." ;
      return ;
    } else {
      return "<link>shared" ;
    }
  }
}

# MacPorts' default location is /opt/local -- use this if no path is given.
with-macports = [ option.get "with-macports" : : "/opt/local" ] ;
if $(with-macports) {
  using darwin ;
  ECHO "Using --with-macports=$(with-macports), implying use of darwin GCC" ;

  L-boost-search = -L$(with-macports)/lib ;
  boost-search = <search>$(with-macports)/lib ;
  I-boost-include = -I$(with-macports)/include ;
  boost-include = <include>$(with-macports)/include ;
}
else {
  with-boost = [ option.get "with-boost" ] ;
  with-boost ?= [ os.environ "BOOST_ROOT" ] ;
  if $(with-boost) {
    L-boost-search = -L$(with-boost)/lib" "-L$(with-boost)/lib64 ;
    boost-search = <search>$(with-boost)/lib <search>$(with-boost)/lib64 ;
    I-boost-include = -I$(with-boost)/include ;
    boost-include = <include>$(with-boost)/include ;
  } else {
    L-boost-search = "" ;
    boost-search = ;
    I-boost-include = "" ;
    boost-include = ;
  }
}
 
#Convenience rule for boost libraries.  Defines library boost_$(name).  
rule boost-lib ( name macro : deps * ) {
  #Link multi-threaded programs against the -mt version if available.  Old 
  #versions of boost do not have -mt tagged versions of all libraries.   Sadly,
  #boost.jam does not handle this correctly.  
  if [ test_flags $(L-boost-search)" -lboost_"$(name)"-mt$(boost-lib-version)" ] {
    lib inner_boost_$(name) : : <threading>single $(boost-search) <name>boost_$(name)$(boost-lib-version) : : <library>$(deps) ;
    lib inner_boost_$(name) : : <threading>multi $(boost-search) <name>boost_$(name)-mt$(boost-lib-version) : : <library>$(deps) ;
  } else {
    lib inner_boost_$(name) : : $(boost-search) <name>boost_$(name)$(boost-lib-version) : : <library>$(deps) ;
  }

  alias boost_$(name) : inner_boost_$(name) : $(boost-auto-shared) : : <link>shared:<define>BOOST_$(macro) $(boost-include) ;
}

#Argument is e.g. 103600
rule boost ( min-version ) {
  local cmd = "bash -c \"g++ "$(I-boost-include)" -dM -x c++ -E /dev/null -include boost/version.hpp 2>/dev/null |grep '#define BOOST_'\"" ;
  local boost-shell = [ SHELL "$(cmd)" : exit-status ] ;
  if $(boost-shell[2]) != 0 && $(CLEANING) = no {
    echo Failed to run "$(cmd)" ;
    exit Boost does not seem to be installed or g++ is confused. : 1 ;
  }
  boost-version = [ MATCH "#define BOOST_VERSION ([0-9]*)" : $(boost-shell[1]) ] ;
  if $(boost-version) < $(min-version) && $(CLEANING) = no {
    exit You have Boost $(boost-version).  This package requires Boost at least $(min-version) (and preferably newer). : 1 ;
  }
  # If matching version tags exist, use them.  
  boost-lib-version = [ MATCH "#define BOOST_LIB_VERSION \"([^\"]*)\"" : $(boost-shell[1]) ] ;
  if [ test_flags $(L-boost-search)" -lboost_program_options-"$(boost-lib-version) ] {
    boost-lib-version = "-"$(boost-lib-version) ;
  } else {
    boost-lib-version = "" ;
  }

  #Are we linking static binaries against shared boost?
  boost-auto-shared = [ auto-shared "boost_program_options"$(boost-lib-version) : $(L-boost-search) ] ;

  #See tools/build/v2/contrib/boost.jam in a boost distribution for a table of macros to define.   
  boost-lib system SYSTEM_DYN_LINK ;
  boost-lib thread THREAD_DYN_DLL : boost_system ;
  boost-lib program_options PROGRAM_OPTIONS_DYN_LINK ;
  boost-lib unit_test_framework TEST_DYN_LINK ;
  boost-lib iostreams IOSTREAMS_DYN_LINK ;
  boost-lib filesystem FILE_SYSTEM_DYN_LINK ;
}
 
#Link normally to a library, but sometimes static isn't installed so fall back to dynamic.
rule external-lib ( name : search-path * ) {
  lib $(name) : : [ auto-shared $(name) : "-L"$(search-path) ] <search>$(search-path) ;
}

#Write the current command line to previous.sh.  This does not do shell escaping.  
{
  local build-log = $(TOP)/previous.sh ;
  if ! [ path.exists $(build-log) ] {
    SHELL "touch $(build-log) && chmod +x $(build-log)" ;
  }
  local script = [ modules.peek : ARGV ] ;
  if $(script[1]) = "./jam-files/bjam" {
    #The ./bjam shell script calls ./jam-files/bjam so that appears in argv but
    #we want ./bjam to appear so the environment variables are set correctly.  
    script = "./bjam "$(script[2-]:J=" ") ;
  } else {
    script = $(script:J=" ") ;
  }
  script = "#!/bin/sh\n$(script)\n" ;
  local ignored = @($(build-log):E=$(script)) ;
}

#Boost jam's static clang for Linux is buggy.
requirements += <cxxflags>$(cxxflags) <cflags>$(cflags) <linkflags>$(ldflags) <os>LINUX,<toolset>clang:<link>shared ;

if ! [ option.get "without-libsegfault" : : "yes" ] && ! $(FORCE-STATIC) {
  #libSegFault prints a stack trace on segfault.  Link against it if available.  
  if [ test_flags "-lSegFault" ] {
    external-lib SegFault ;
    requirements += <library>SegFault ;
  }
}

if [ option.get "git" : : "yes" ] {
  local revision = [ _shell "git rev-parse --verify HEAD |head -c 7" ] ;
  constant GITTAG : "/"$(revision) ;
} else {
  constant GITTAG : "" ;
}

prefix = [ option.get "prefix" ] ;
if $(prefix) {
  prefix = [ path.root $(prefix) [ path.pwd ] ] ;
  prefix = $(prefix)$(GITTAG) ;
} else {
  prefix = $(TOP)$(GITTAG) ;
}

bindir = [ option.get "bindir" : $(prefix)/bin ] ;
libdir = [ option.get "libdir" : $(prefix)/lib ] ;
rule install-bin-libs ( deps * ) {
  install prefix-bin : $(deps) : <location>$(bindir) <install-dependencies>on <install-type>EXE <link>shared:<dll-path>$(libdir) ;
  install prefix-lib : $(deps) : <location>$(libdir) <install-dependencies>on <install-type>LIB <link>shared:<dll-path>$(libdir) ;
}
rule install-headers ( name : list * : source-root ? ) {
  local includedir = [ option.get "includedir" : $(prefix)/include ] ;
  source-root ?= "." ;
  install $(name) : $(list) : <location>$(includedir) <install-source-root>$(source-root) ;
}

rule build-projects ( projects * ) {
  for local p in $(projects) {
    build-project $(p) ;
  }
}

#Only one post build hook is allowed.  Allow multiple.  
post-hooks = ;
rule post-build ( ok ? ) {
  for local r in $(post-hooks) {
    $(r) $(ok) ;
  }
}
IMPORT $(__name__) : post-build : : $(__name__).post-build ;
build-system.set-post-build-hook $(__name__).post-build ;
rule add-post-hook ( names * ) {
  post-hooks += $(names) ;
}


#Backend for writing content to files after build completes.
post-files = ;
post-contents = ;
rule save-post-build ( ok ? ) {
  if $(ok) {
    while $(post-files) {
      local ignored = @($(post-files[1]):E=$(post-contents[1])) ;
      post-files = $(post-files[2-]) ;
      post-contents = $(post-contents[2-]) ;
    }
  }
}
add-post-hook save-post-build ;

#Queue content to be written to file when build completes successfully.  
rule add-post-write ( name content ) {
  post-files += $(name) ;
  post-contents += $(content) ;
}

#Compare contents of file with current.  If they're different, force the targets to rebuild then overwrite the file.  
rule always-if-changed ( file current : targets * ) {
  local previous = inconsistent ;
  if [ path.exists $(file) ] {
    previous = [ _shell "cat $(file)" ] ;
  }
  if $(current) != $(previous) {
    #Write inconsistent while the build is running
    if [ path.exists $(file) ] {
      local ignored = @($(file):E=inconsistent) ;
    }
    add-post-write $(file) $(current) ;
    for local i in $(targets) {
      always $(i) ;
    }
  }
}

if [ option.get "sanity-test" : : "yes" ] {
  local current_version = [ modules.peek : JAM_VERSION ] ;
  if ( $(current_version[0]) < 2000 && [ version.check-jam-version 3 1 16 ] ) || [ version.check-jam-version 2011 0 0 ] {
    EXIT "Sane" : 0 ;
  } else {
    EXIT "Bad" : 1 ;
  }
}

use-project /top : . ;