Make the output of `ninja -t inputs` deterministic

This sorts the output of `ninja -t inputs` to make it
deterministic and remove duplicates, and adds a regression
test in output_test.py

+ Ensure all inputs are listed, not only explicit ones.
+ Document the `inputs` tool in doc/manual.asciidoc.

1 files changed, 18 insertions, 0 deletions

diff --git a/misc/output_test.py b/misc/output_test.py
index 45698f1..141716c 100755
--- a/misc/output_test.py
+++ b/misc/output_test.py
@@ -134,5 +134,23 @@ red
         output = run(Output.BUILD_SIMPLE_ECHO, flags='-C$PWD', pipe=True)
         self.assertEqual(output.splitlines()[0][:25], "ninja: Entering directory")
 
+    def test_tool_inputs(self):
+        plan = '''
+rule cat
+  command = cat $in $out
+build out1 : cat in1
+build out2 : cat in2 out1
+build out3 : cat out2 out1 | implicit || order_only
+'''
+        self.assertEqual(run(plan, flags='-t inputs out3'),
+'''implicit
+in1
+in2
+order_only
+out1
+out2
+''')
+
+
 if __name__ == '__main__':
     unittest.main()