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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 ;