X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftarget.cpp;h=fa63ac4e5154293050db87c91168d4c286690938;hb=654de39b62a9a58fd8e1b5a557361d628345788b;hp=481d2f4a68dd460a6f3c0a8222af58be349208c9;hpb=4dc31cca056ea293d320928f61fef0558089d32d;p=builder.git

diff --git a/source/target.cpp b/source/target.cpp
index 481d2f4..fa63ac4 100644
--- a/source/target.cpp
+++ b/source/target.cpp
@@ -1,47 +1,165 @@
+/* $Id$
+
+This file is part of builder
+Copyright © 2006-2007 Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#include <msp/path/utils.h>
+#include <msp/time/utils.h>
+#include "action.h"
 #include "builder.h"
+#include "package.h"
+#include "sourcepackage.h"
 #include "target.h"
 
 using namespace std;
+using namespace Msp;
 
-Target *TargetRef::get_target()
-{
-	if(!target)
-		target=builder.get_target(name);
-	return target;
-}
-
+/**
+Tries to locate a target that will help getting this target built.  If all
+dependencies are up-to-date, returns this target.  If there are no targets
+ready to be built (maybe because they are being built right now), returns 0.
+*/
 Target *Target::get_buildable_target()
 {
-	if(rebuild && ready_for_build && !building)
-		return this;
+	if(!rebuild)
+		return 0;
 
-	for(list<Target *>::iterator i=depends.begin(); i!=depends.end(); ++i)
+	bool self_ok=!building;
+	for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
 	{
 		Target *tgt=(*i)->get_buildable_target();
 		if(tgt)
 			return tgt;
+		else if((*i)->get_rebuild())
+			self_ok=false;
 	}
 
+	if(self_ok)
+		return this;
+
 	return 0;
 }
 
 void Target::add_depend(Target *dep)
 {
+	if(dep==this)
+		throw InvalidParameterValue("A target can't depend on itself");
 	depends.push_back(dep);
 	dep->rdepends.push_back(this);
 }
 
+/**
+Prepares the target by recursively preparing dependencies, then checking
+whether rebuilding is needed.  A flag is used to prevent unnecessary
+executions.
+*/
+void Target::prepare()
+{
+	if(prepared)
+		return;
+
+	prepared=true;
+	for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
+		(*i)->prepare();
+
+	check_rebuild();
+
+}
+
+/**
+Returns the number of targets that need to be rebuilt in order to get this
+target up-to-date.
+*/
+unsigned Target::count_rebuild()
+{
+	if(counted)
+		return 0;
+
+	counted=true;
+	unsigned count=rebuild;
+	for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
+		count+=(*i)->count_rebuild();
+	return count;
+}
+
+/**
+Changes the mtime of the target to the current time.
+*/
+void Target::touch()
+{
+	mtime=Time::now();
+}
+
 Target::Target(Builder &b, const Package *p, const string &n):
 	builder(b),
 	package(p),
 	name(n),
+	buildable(false),
 	building(false),
 	rebuild(false),
-	ready_for_build(false)
-{ }
+	deps_ready(false),
+	prepared(false),
+	counted(false)
+{
+	builder.add_target(this);
+
+	struct stat st;
+	if(!Path::stat(name, st))
+		mtime=Time::TimeStamp::from_unixtime(st.st_mtime);
+}
 
 void Target::mark_rebuild(const std::string &reason)
 {
 	rebuild=true;
 	rebuild_reason=reason;
 }
+
+/**
+Checks if this target needs to be rebuilt and why.
+*/
+void Target::check_rebuild()
+{
+	if(!buildable)
+		return;
+
+	if(builder.get_build_all())
+		mark_rebuild("Rebuilding everything");
+	else if(!mtime)
+		mark_rebuild("Does not exist");
+	else
+	{
+		for(TargetList::iterator i=depends.begin(); (i!=depends.end() && !rebuild); ++i)
+		{
+			if((*i)->get_mtime()>mtime)
+				mark_rebuild(Path::basename((*i)->get_name())+" has changed");
+			else if((*i)->get_rebuild())
+				mark_rebuild(Path::basename((*i)->get_name())+" needs rebuilding");
+		}
+	}
+
+	const SourcePackage *spkg=dynamic_cast<const SourcePackage *>(package);
+	if(!rebuild && spkg && spkg->get_config().get_mtime()>mtime)
+		mark_rebuild("Package options changed");
+}
+
+/**
+Hooks the target up with the given action, then returns it.  This should be
+called from the public build() function of buildable targets.
+*/
+Action *Target::build(Action *action)
+{
+	building=true;
+	action->signal_done.connect(sigc::mem_fun(this, &Target::build_done));
+	return action;
+}
+
+/**
+Handles for the build_done signal of Action.
+*/
+void Target::build_done()
+{
+	building=false;
+	rebuild=false;
+}