#  Copyright (C) Vladimir Prus 2002. Permission to copy, use, modify, sell and
#  distribute this software is granted provided this copyright notice appears in
#  all copies. This software is provided "as is" without express or implied
#  warranty, and with no claim as to its suitability for any purpose.

#  Provides actions common to all toolsets, for as making directoies and
#  removing files.

import os ;
import modules ;
import utility ;
import print ;
import type ;
import feature ;
import errors ;
import path ;
import sequence ;
import toolset ;

if [ MATCH (--debug-configuration) : [ modules.peek : ARGV ] ]
{
    .debug-configuration = true ;
}

# Configurations
#
# The following class helps to manage toolset configurations. Each configuration 
# has unique ID and one or more parameters. A typical example of unique ID is 
# a condition generated by 'common.check-init-parameters' rule. Other kinds of 
# ID can be used. Parameters may include any details about the configuration like 
# 'command', 'path', etc. 
#
# A configuration may be in one of two states: 
# 
#   - registered - a toolset configuration is registered (by autodetection code 
#       for instance) but is not used. I.e. 'toolset.using' wasn't yet been called 
#       for this configuration.
#   - used - once called 'toolset.using' marks the configuration as 'used'.
#
# The main difference between the states is that while a configuration is 
# 'registered' its options can be freely changed. This is useful in particular 
# for autodetection code - all detected configurations may be safely overwritten 
# by a user.

class configurations
{
    import errors : error ;

    rule __init__ ( )
    {
    }
    
    # Registers a configuration. 
    #
    # Returns 'true' if the configuration has been added and an empty value if 
    # it already exists. Reports an error if the configuration is 'used'.
    rule register ( id )
    {
        if $(id) in $(self.used) 
        {
            error "common: the configuration '$(id)' is in use" ;
        }

        local retval ;

        if ! $(id) in $(self.all)
        {
            self.all += $(id) ;

            # indicate that a new configuration has been added
            retval = true ;
        }

        return $(retval) ;
    }

    # Mark a configuration as 'used'. 
    #
    # Returns 'true' if the state of the configuration has been changed to 
    # 'used' and an empty value if it the state wasn't changed. Reports an error
    # if the configuration isn't known.
    rule use ( id )
    {
        if ! $(id) in $(self.all)
        {
            error "common: the configuration '$(id)' is not known" ;
        }

        local retval ;

        if ! $(id) in $(self.used) 
        {
            self.used += $(id) ;

            # indicate that the configuration has been marked as 'used'
            retval = true ;
        }

        return $(retval) ;
    }

    # Return all registered configurations.
    rule all ( )
    {
        return $(self.all) ;
    }

    # Return all used configurations.
    rule used ( )
    {
        return $(self.used) ;
    }
    
    # Returns the value of a configuration parameter.
    rule get ( id : param )
    {
        return $(self.$(param).$(id)) ; 
    }

    # Sets the value of a configuration parameter.
    rule set ( id : param : value * )
    {
        self.$(param).$(id) = $(value) ; 
    }
}


# The rule checks toolset parameters. Each trailing parameter 
# should be a pair of parameter name and parameter value.
# The rule will check that each parameter either has value in
# each invocation, or has no value in each invocation. Also,
# the rule will check that the combination of all parameter values is
# unique in all invocations.
#
# Each parameter name corresponds to subfeature. This rule will declare subfeature
# the first time non-empty parameter value is passed, and will extend it with
# all the values.
#
# The return value from this rule is a condition to be used for flags settings.
rule check-init-parameters ( toolset : * )
{
    local sig = $(toolset) ;
    local condition = <toolset>$(toolset) ;
    for local index in 2 3 4 5 6 7 8 9
    {
        local name = $($(index)[1]) ;
        local value = $($(index)[2]) ;
                
        if $(value)-is-specified 
        {
            condition = $(condition)-$(value) ;
            if $(.had-unspecified-value.$(toolset).$(name))
            {
                errors.user-error
                "$(toolset) initialization: parameter '$(name)' inconsistent" :
                "no value was specified in earlier initialization" :
                "an explicit value is specified now" ;
            }
            # The below logic is for intel compiler. It calls this rule
            # with 'intel-linux' and 'intel-win' as toolset, so we need to
            # get the base part of toolset name.
            # We can't pass 'intel' as toolset, because it that case it will
            # be impossible to register versionles intel-linux and
            # intel-win of specific version.
            local t = $(toolset) ;
            local m = [ MATCH ([^-]*)- : $(toolset) ] ;
            if $(m)
            {
                t = $(m[1]) ;
            }                                    
            if ! $(.had-value.$(toolset).$(name)) 
            {
                if ! $(.declared-subfeature.$(t).$(name))
                {
                    feature.subfeature toolset $(t) : $(name) : : propagated ;
                    .declared-subfeature.$(t).$(name) = true ;
                }                
                .had-value.$(toolset).$(name) = true ;
            }
            feature.extend-subfeature toolset $(t) : $(name) : $(value) ;
        }
        else
        {
            if $(.had-value.$(toolset).$(name))             
            {
                errors.user-error                
                "$(toolset) initialization: parameter '$(name)' inconsistent" :
                "an explicit value was specified in an earlier initialization" :
                "no value is specified now" ;           
            }
            .had-unspecified-value.$(toolset).$(name) = true ;
        }
        sig = $(sig)$(value:E="")- ;
    }
    if $(sig) in $(.all-signatures)
    {
        local message = 
          "duplicate initialization of $(toolset) with the following parameters: " ;
        for local index in 2 3 4 5 6 7 8 9
        {
            local p = $($(index)) ;
            if $(p)
            {
                message += "$(p[1]) = $(p[2]:E=<unspecified>)" ;
            }            
        }
        message += "previous initialization at $(.init-loc.$(sig))" ;
        errors.user-error $(message[1]) : $(message[2]) : $(message[3]) : $(message[4])
        : $(message[5]) : $(message[6]) : $(message[7]) : $(message[8]) ;
    }                
    .all-signatures += $(sig) ;
    .init-loc.$(sig) = [ errors.nearest-user-location ] ;
    
    return $(condition) ;
}

# A helper rule to get the command to invoke some tool. 
# In 'user-provided-command' is not given, tries to find binary
# named 'tool' in PATH and in the passed 'additional-path'. Otherwise,
# verified that the first element of 'user-provided-command' is an
# existing program.
#
#
# This rule returns the command to be used when invoking the tool. If we can't
# find the tool, a warning is issued.
# If 'path-last' is specified, PATH is checked after 'additional-paths' when
# searching to 'tool'.
rule get-invocation-command ( 
    toolset : tool : user-provided-command * : additional-paths * : path-last ? )
{
    local command ;
    if ! $(user-provided-command)
    {
        command = [ common.find-tool $(tool) : $(additional-paths) : $(path-last) ] ;
        if ! $(command)
        {
            if $(.debug-configuration)
            {
                ECHO "warning: toolset $(toolset) initialization: can't find tool $(tool)" ;
                ECHO "warning: initialized from" [ errors.nearest-user-location ] ;
            }
        }        
    }
    else
    {
        command = [ common.check-tool $(user-provided-command) ] ;        
        if ! $(command)
        {
            if $(.debug-configuration)
            {
                ECHO "warning: toolset $(toolset) initialization: " ;
                ECHO "warning: can't find user-provided command " '$(user-provided-command)' ;
                ECHO "warning: initialized from" [ errors.nearest-user-location ] ;
            }
            # It's possible, in theory, that user-provided command is OK, but we're
            # not smart enough to understand that. 
            command = $(user-provided-command) ;
        }        
    }
    if ! $(command)
    {        
        command = $(user-provided-command) ;
    }    
    return $(command) ;
}

# Given an invocation command,
# return the absolute path to the command. This works even if commnad
# has not path element and is present in PATH.
rule get-absolute-tool-path ( command )
{
    if $(command:D)
    {
        return $(command:D) ;
    }
    else
    {
        local m = [ GLOB [ modules.peek : PATH Path path ] : $(command) $(command).exe ] ;
        return $(m[1]:D) ;
    }    
}



# Attempts to find tool (binary) named 'name' in PATH and in 'additional-paths'.
# If found in PATH, returns 'name'.
# If found in additional paths, returns absolute name. If the tool is found
# in several directories, return all paths.
# Otherwise, returns empty string.
# If 'path-last' is specified, PATH is searched after 'additional-paths'.
rule find-tool ( name : additional-paths * : path-last ? )
{
    local path = [ path.programs-path ] ;
    local match = [ path.glob $(path) : $(name) $(name).exe ] ;
    local additional-match = [ path.glob $(additional-paths) : $(name) $(name).exe ] ;              

    local result ;
    if $(path-last)
    {
        result = $(additional-match) ;
        if ! $(result) && $(match)
        {
            result = $(name) ;
        }
    }
    else
    {
        if $(match)
        {
            result = $(name) ;
        }
        else
        {
            result = $(additional-match) ;
        }
    }
    if $(result)
    {        
        return [ path.native $(result[1]) ] ;
    }    
}

# Checks if 'command' can be found either in path
# or is a full name to an existing file.
rule check-tool-aux ( command )
{
    if $(command:D)
    {
        if [ path.exists $(command) ]
        {
            return $(command) ;
        }        
    }
    else
    {
        if [ GLOB [ modules.peek : PATH Path path ] : $(command) ]
        {
            return $(command) ;
        }        
    }        
}


# Checks that a tool can be invoked by 'command'. 
# If command is not an absolute path, checks if it can be found in 'path'.
# If comand is absolute path, check that it exists. Returns 'command'
# if ok and empty string otherwise.
rule check-tool ( xcommand + )
{
    if   [ check-tool-aux $(xcommand[1]) ] 
      || [ check-tool-aux $(xcommand[-1]) ]
    {
        return $(xcommand) ;
    }
}

# Handle common options for toolset, specifically sets the following
# flag variables:
# - CONFIG_COMMAND to 'command'
# - OPTIONS for compile.c to the value of <cflags> in options
# - OPTIONS for compile.c++ to the value of <cxxflags> in options
# - OPTIOns for compile to the value of <compileflags> in options
# - OPTIONs for link to the value of <linkflags> in options
rule handle-options ( toolset : condition * : command * : options * )
{
    # The last parameter ('true') says it's OK to set flags for another
    # module,   
    toolset.flags $(toolset) CONFIG_COMMAND $(condition) : $(command) : unchecked ;
    toolset.flags $(toolset).compile OPTIONS $(condition) :
      [ feature.get-values <compileflags> : $(options) ] : unchecked ;
    toolset.flags $(toolset).compile.c OPTIONS $(condition) :
      [ feature.get-values <cflags> : $(options) ] : unchecked ;
    toolset.flags $(toolset).compile.c++ OPTIONS $(condition) :
      [ feature.get-values <cxxflags> : $(options) ] : unchecked ;
    toolset.flags $(toolset).compile.fortran OPTIONS $(condition) :
      [ feature.get-values <fflags> : $(options) ] : unchecked ;
    toolset.flags $(toolset).link OPTIONS $(condition) :
      [ feature.get-values <linkflags> : $(options) ] : unchecked ;        
}


# returns the location of the "program files" directory on a windows
# platform
rule get-program-files-dir ( )
{
    local ProgramFiles = [ modules.peek : ProgramFiles ] ;
    if $(ProgramFiles)
    {
        ProgramFiles = "$(ProgramFiles:J= )" ;
    }
    else
    {
        ProgramFiles = "c:\\Program Files" ;
    }
    return $(ProgramFiles) ;
}

if [ os.name ] = NT
{
    RM = del /f /q ;
    CP = copy ;
    IGNORE = "2>nul >nul & setlocal" ;
}
else
{
    RM = rm -f ;
    CP = cp ;
}

nl = "
" ;

rule rm-command ( ) 
{
     return $(RM) ;
}

rule copy-command ( )
{
    return $(CP) ;
}


# Returns the command needed to set the environment variable on the
# current platform.  The variable setting persists through all
# following commands and is visible in the environment seen by
# subsequently executed commands.  In other words, on Unix systems,
# the variable is exported, which is consistent with the only possible
# behavior on Windows systems.
rule variable-setting-command ( variable : value )
{    
    if [ os.name ] = NT
    {
        return "set $(variable)=$(value)$(nl)" ;
    }
    else
    {
        return "$(variable)=$(value)$(nl)export $(variable)$(nl)" ;
    }
}

# Returns a command that sets the named shell path variable to the
# given NATIVE paths to on the current platform.
rule path-variable-setting-command ( variable : paths * )
{   
    local sep = [ os.path-separator ] ;
    return [ variable-setting-command $(variable) : $(paths:J=$(sep)) ] ;
}

# Returns a command that prepends the given paths to the named path
# variable on the current platform.
rule prepend-path-variable-command ( variable : paths * )
{   
    return [ 
      path-variable-setting-command $(variable) 
        : $(paths) [ os.expand-variable $(variable) ]
    ] ;
}


# Return a command which can create a file. If 'r' is result of invocation,
# then 
#   r foobar
# will create foobar with unspecified content. What happens if file already 
# exists is unspecified.
rule file-creation-command ( )
{
    if [ modules.peek : NT ]
    {
        return "echo. > " ;
    }
    else
    {
        return "touch " ;
    }
}

        
# Returns a command that may be used for 'touching' files.
# It is not a real 'touch' command on NT because it adds an empty line at 
# the end of file but it works with source files
rule file-touch-command ( )
{
    if [ os.name ] in NT
    {
        return "echo. >> " ;
    }
    else
    {
        return "touch " ;
    }
}


rule MkDir
{
    # If dir exists, don't update it
    # Do this even for $(DOT).

    NOUPDATE $(<) ;

    if $(<) != $(DOT) && ! $($(<)-mkdir)
    {
        local s ;

        # Cheesy gate to prevent multiple invocations on same dir
        # MkDir1 has the actions
        # Arrange for jam dirs

        $(<)-mkdir = true ;
        MkDir1 $(<) ;
        Depends dirs : $(<) ;

        # Recursively make parent directories.
        # $(<:P) = $(<)'s parent, & we recurse until root

        s = $(<:P) ;

        if $(NT)
        {
            switch $(s)
            {
                case *:   : s = ;
                case *:\\ : s = ;
            }
        }
        
        if $(s) && $(s) != $(<)
        {
            Depends $(<) : $(s) ;
            MkDir $(s) ;
        }
        else if $(s)
        {
            NOTFILE $(s) ;
        }
    }
}

actions MkDir1
{
    mkdir "$(<)"
}

actions piecemeal together existing Clean
{
    $(RM) "$(>)"
}

rule copy 
{    
}


actions copy
{
    $(CP) "$(>)" "$(<)"
}

rule RmTemps
{
}
actions quietly updated piecemeal together RmTemps
{
    $(RM) "$(>)" $(IGNORE)
}

rule __test__ ( ) {

    import assert ;
    
    local save-os = [ modules.peek os : name ] ;
    
    modules.poke os : .name : LINUX ;
    
    local nl = "
" ;
    
    assert.result "PATH=foo:bar:baz$(nl)export PATH$(nl)"
      : path-variable-setting-command PATH : foo bar baz ;
    
    assert.result "PATH=foo:bar:$PATH$(nl)export PATH$(nl)"
      : prepend-path-variable-command PATH : foo bar ;
    
    modules.poke os : .name : NT ;
    
    assert.result "set PATH=foo;bar;baz$(nl)"
      : path-variable-setting-command PATH : foo bar baz ;
    
    assert.result "set PATH=foo;bar;%PATH%$(nl)"
      : prepend-path-variable-command PATH : foo bar ;

    modules.poke os : .name : $(save-os) ;      
}