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# Copyright 2003 Dave Abrahams
# Copyright 2002, 2003 Rene Rivera
# Copyright 2002, 2003, 2004, 2005 Vladimir Prus
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
# Defines the "symlink" special target. 'symlink' targets make symbolic links
# to the sources.
import targets modules path class os feature project property-set ;
.count = 0 ;
feature.feature symlink-location : project-relative build-relative : incidental ;
# The class representing "symlink" targets.
#
class symlink-targets : basic-target
{
import numbers modules class property project path ;
rule __init__ (
project
: targets *
: sources *
)
{
# Generate a fake name for now. Need unnamed targets eventually.
local c = [ modules.peek symlink : .count ] ;
modules.poke symlink : .count : [ numbers.increment $(c) ] ;
local fake-name = symlink#$(c) ;
basic-target.__init__ $(fake-name) : $(project) : $(sources) ;
# Remember the targets to map the sources onto. Pad or truncate
# to fit the sources given.
self.targets = ;
for local source in $(sources)
{
if $(targets)
{
self.targets += $(targets[1]) ;
targets = $(targets[2-]) ;
}
else
{
self.targets += $(source) ;
}
}
# The virtual targets corresponding to the given targets.
self.virtual-targets = ;
}
rule construct ( name : source-targets * : property-set )
{
local i = 1 ;
for local t in $(source-targets)
{
local s = $(self.targets[$(i)]) ;
local a = [ class.new action $(t) : symlink.ln : $(property-set) ] ;
local vt = [ class.new file-target $(s:D=)
: [ $(t).type ] : $(self.project) : $(a) ] ;
# Place the symlink in the directory relative to the project
# location, instead of placing it in the build directory.
if [ property.select <symlink-location> : [ $(property-set).raw ] ] = <symlink-location>project-relative
{
$(vt).set-path [ path.root $(s:D) [ $(self.project).get location ] ] ;
}
self.virtual-targets += $(vt) ;
i = [ numbers.increment $(i) ] ;
}
return [ property-set.empty ] $(self.virtual-targets) ;
}
}
# Creates a symbolic link from a set of targets to a set of sources.
# The targets and sources map one to one. The symlinks generated are
# limited to be the ones given as the sources. That is, the targets
# are either padded or trimmed to equate to the sources. The padding
# is done with the name of the corresponding source. For example::
#
# symlink : one two ;
#
# Is equal to::
#
# symlink one two : one two ;
#
# Names for symlink are relative to the project location. They cannot
# include ".." path components.
rule symlink (
targets *
: sources *
)
{
local project = [ project.current ] ;
return [ targets.main-target-alternative
[ class.new symlink-targets $(project) : $(targets) :
# Note: inline targets are not supported for symlink, intentionally,
# since it's used to linking existing non-local targets.
$(sources) ] ] ;
}
rule ln
{
local os ;
if [ modules.peek : UNIX ] { os = UNIX ; }
else { os ?= [ os.name ] ; }
# Remember the path to make the link relative to where the symlink is located.
local path-to-source = [ path.relative-to
[ path.make [ on $(<) return $(LOCATE) ] ]
[ path.make [ on $(>) return $(LOCATE) ] ] ] ;
if $(path-to-source) = .
{
PATH_TO_SOURCE on $(<) = "" ;
}
else
{
PATH_TO_SOURCE on $(<) = [ path.native $(path-to-source) ] ;
}
ln-$(os) $(<) : $(>) ;
}
actions ln-UNIX
{
ln -f -s '$(>:D=:R=$(PATH_TO_SOURCE))' '$(<)'
}
# there is a way to do this; we fall back to a copy for now
actions ln-NT
{
echo "NT symlinks not supported yet, making copy"
del /f /q "$(<)" 2>nul >nul
copy "$(>)" "$(<)" $(NULL_OUT)
}
IMPORT $(__name__) : symlink : : symlink ;
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