rubu_example in rubu-0.0.3

- old
+ new

@@ -22,10 +22,11 @@
 # Build specific definitions:
 
 # Set trail related options.
 Var[ :bin_dir ]    = 'bin'
 Var[ :source_dir ] = 'src'
+Var[ :gen_dir ]    = 'gen_cee'
 Var[ :build_dir ]  = 'build'
 Var[ :exe_name ]   = 'build/hello'
 
 # Default for :fast option.
 Var[ :fast ] = false
@@ -33,20 +34,25 @@
 # Change Rubu to verbose mode.
 if Opt['verbose'].given
     Order[ :verbose ] = true
 end
 
+# Force serial execution.
+if Opt[ 'serial' ].given
+    Order[ :serial ] = true
+end
+
 # Read setup files and apply Como command line arguments to Var space.
 Trail.setup( :como => 'conf' )
 
 
 # ------------------------------------------------------------
 # Collect sources and create targets:
 
 # Generator file and the target.
 gen_file      = Mark.path( "#{Var[:bin_dir]}/gen_world" )
-gen_cee_file  = Mark.path( "#{Var[:build_dir]}/world.c" )
+gen_cee_file  = Mark.path( "#{Var[:gen_dir]}/world.c" )
 
 # Collect "normal" C files.
 cee_files     = Mark.glob( "#{Var[:source_dir]}/*.c" )
 
 # Create complete list of all C files.
@@ -72,11 +78,18 @@
     def step
         shrun "bin/gen_world"
     end
 end
 
+# Code generator with generated file content dependency.
+class GenGreenWorld < StepMark
+    def step
+        shrun "bin/gen_world"
+    end
+end
 
+
 # Typical C compilation with GCC, from source to object.
 class GccCompileFile < StepAged
 
     def setup
         @cmd = "gcc -Wall -I #{Var[:source_dir]} -c #{source.rpath} -o #{target.rpath}"
@@ -133,27 +146,46 @@
 Walk.form 'gen-cee' do
     # Create GenWorld build and register it to 'gen-cee'.
     GenWorld.use( gen_file, gen_cee_file )
 end
 
+# Serial trail for code generation (with filtered updates).
+Walk.form 'gen-cee-green' do
+    # Create GenGreenWorld build and register it to 'gen-cee-green'.
+    GenGreenWorld.use( gen_file, gen_cee_file )
+end
+
 # Parallel compilation of all C files.
 Fork.form 'compile-cee' do
     # Create set of GCC builds by joining 'all_cee_files' and
     # 'obj_files' in pairs.
     GccCompileFile.usezip( all_cee_files, obj_files )
 end
 
+# Link executable.
+Walk.form 'link' do
+    GccLinkExe.use( obj_files, exe_file )
+end
+
 # Default trail, i.e. generate, compile, link to executable.
 Walk.form 'default' do
     # Reference 'gen-cee' trail.
     pick 'gen-cee'
     # Reference 'compile-cee' trail.
     pick 'compile-cee'
     # Create GCC link build and register it.
-    GccLinkExe.use( obj_files, exe_file )
+    pick 'link'
 end
 
+# Trail for 'up-to-date' script (see: example dir).
+Walk.form 'up-to-date' do
+    # Reference 'gen-cee-green' trail.
+    pick 'gen-cee-green'
+    # Reference 'compile-cee' trail.
+    pick 'compile-cee'
+end
+
 # Cleaner trail.
 Walk.form 'clean' do
     CleanObjects.use
 end
 
@@ -165,12 +197,8 @@
 trails = nil
 if Opt[ nil ].given
     trails = Opt[ nil ].value
 else
     trails = [ 'default' ]
-end
-
-if Opt[ 'serial' ].given
-    Order[ :serial ] = true
 end
 
 Trail.run( trails )