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http://issues.apache.org/bugzilla/show_bug.cgi?id=34845 Summary: RFE: new <delegate> task Product: Ant Version: 1.6.3 Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P2 Component: Core tasks AssignedTo: dev@ant.apache.org ReportedBy: [EMAIL PROTECTED] Summary: a new task is needed to allow a set of Ant scripts to merely configure some settings and then delegate the actual execution of targets to one central, common Ant script for the project. The Problem: Consider creating one "Master" Ant script for a project which encapsulates the features, dependencies, and functionality for the most common targets (such as compile, build, javadoc, clean, and their project-wide equivalents like build-all, clean-all, etc). For example, one target in this Master script might be: <target name="compile-pkg"> <pathconvert refid="dependencies" property="has_deps" dirsep="${file.separator}" setOnEmpty="false"/> <antcall target="compile-dependencies" inheritRefs="true"/> <mkdir dir="${CLASS_DIR}"/> <property name="excludes" value=""/> <!-- no-op if already set --> <javac srcdir="${SRC_JAVA_DIR}" includes="${PKG_PATH}/**/*.java" classpathref="compile_classpath" destdir="${CLASS_DIR}" excludes="${excludes}" deprecation="on" debug="on"/> </target> It is wonderful to encapsulate all the logic for this target in one place. However, to make use of it, every (subordinate) script which calls this target in this Master script has to use code like: <target name="compile" depends="init" description="compiles sources in this package"> <ant antfile="${MASTER}" target="compile-pkg" inheritrefs="true"> <reference refid="my_dependencies" toRefid="dependencies"/> </ant> </target> Further, every subordinate script must be edited to accomodate most changes made to improve the master script, or to add or change functionality. This copy-n-paste replication is brittle and difficult to maintain. The Solution: A new <delegate> task which specifies an Ant script which should "take over" the completion of the current script, including all (unfinished?) targets. The current <ant>, <antcall> and <subant> tasks are specific to a single target. This new <delegate> task would transfer control for ALL remaining targets. Property and reference inheritance is particularly important. The example above illustrates how the master script "compile-pkg" target uses its "compile-dependencies" target to compile all dependent items. Those dependencies are passed in from the subordinate script to the Master script using the <reference toRefId="..."> task. Note that the Master will likely call other subordinate scripts for those dependent compiles. The following three lines could replace ALL the subordinate script tasks like compile, compile-all, build, build-all, javadoc, javadoc-all, javadoc-pub, etc: <delegate antfile="${MASTER}" inheritrefs="true"> <reference refid="my_dependencies" toRefid="dependencies"/> </delegate> In otherwords, these three lines would replace scores of replicated lines in every subordinate script. The Ant command-line argument -find doesn't quite cut it either, since each subordinate script will have customized elements (like defining the "my_dependencies" path reference in the examples here). As far as the subordinate script is concerned, all the targets in the Master script are available. Thus, -projecthelp and IDE integration should list the targets in delegates as well as any in the subordinate task itself. Note that adding a target to the Master would then automatically "include" that as a new target in every subordinate script. Many simplifying assumptions could be made to reduce the scope of a task like this and make implementation more feasible, including: - <delegate> is only allowed outside of a <target> - any <target>s after a <delegate> are ignored - arguments to <delegate> match those in <ant> (except that target="" is not allowed) -- Configure bugmail: http://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
