-f/-file/-buildfile accepts a directory containing build.xml.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1204655 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -107,6 +107,8 @@ Fixed bugs:
 Other changes:
 --------------
 
+ * -f/-file/-buildfile accepts a directory containing build.xml.
+
  * The <javacc>, <jjtree> and <jjdoc> now support a new maxmemory
    attribute.
    Bugzilla Report 50513.

manual/running.html

@@ -37,7 +37,8 @@ attribute of the <code>&lt;project&gt;</code> tag.
 To make Ant use
 a build file other than <code>build.xml</code>, use the command-line
 option <nobr><code>-buildfile <i>file</i></code></nobr>,
-where <i>file</i> is the name of the build file you want to use.</p>
+where <i>file</i> is the name of the build file you want to use
+(or a directory containing a <code>build.xml</code> file).</p>
 If you use the <nobr><code>-find [<i>file</i>]</code></nobr> option,
 Ant will search for a build file first in the current directory, then in
 the parent directory, and so on, until either a build file is found or the root

src/main/org/apache/tools/ant/Main.java

@@ -451,12 +451,14 @@ public class Main implements AntMain {
             throw new BuildException("Build failed");
         }
 
-        // make sure it's not a directory (this falls into the ultra
-        // paranoid lets check everything category
-
         if (buildFile.isDirectory()) {
-            System.out.println("What? Buildfile: " + buildFile + " is a dir!");
-            throw new BuildException("Build failed");
+            File whatYouMeant = new File(buildFile, "build.xml");
+            if (whatYouMeant.isFile()) {
+                buildFile = whatYouMeant;
+            } else {
+                System.out.println("What? Buildfile: " + buildFile + " is a dir!");
+                throw new BuildException("Build failed");
+            }
         }
 
         // Normalize buildFile for re-import detection