[cache] Add remove command to cache

This allows to clear the content of a specific block.

This allows to experiment re-runs to take advantage of the
cache up to the block that was cleaned.

beat/cmdline/cache.py

@@ -212,3 +212,30 @@ def view(ctx, paths):
                 .replace(')BEAT_LIST_SIZE"', ")")
             )
             logger.info(header + json_data)
+
+
+@cache.command()
+@click.option("--no-inputs", is_flag=True, default=False)
+@click.argument("paths", nargs=-1, required=True)
+@click.pass_context
+def remove(ctx, paths, no_inputs):
+    """Remove content of the cache entries passed in parameters
+
+    To remove an entry:
+
+    $ %(prog)s cache remove 7f/d8/8d/a11178ac27075feaba8131fe878d6e3...
+    """
+    config = ctx.meta["config"]
+
+    for path in paths:
+        fullpath = os.path.join(config.cache, path[: path.rfind("/")])
+        file_list = [os.path.join(fullpath, file_) for file_ in os.listdir(fullpath)]
+
+        if file_list:
+            click.echo("About to delete:\n{}".format("\n".join(file_list)))
+            if no_inputs or click.confirm("Do you confirm the deletion ?"):
+                for file_ in file_list:
+                    os.remove(file_)
+        else:
+            click.echo("Nothing to delete")
+    click.echo("Done")

beat/cmdline/test/test_cache.py

@@ -55,13 +55,15 @@ def call(*args, **kwargs):
 
     use_prefix = kwargs.get("prefix", prefix)
 
+    arguments = ["--prefix", use_prefix, "--cache", tmp_prefix] + list(args)
+
+    verbose = kwargs.get("verbose", False)
+    if not verbose:
+        arguments.insert(0, "--test-mode")
+
     runner = CliRunner()
     with runner.isolated_filesystem():
-        result = runner.invoke(
-            main_cli.main,
-            ["--test-mode", "--prefix", use_prefix, "--cache", tmp_prefix] + list(args),
-            catch_exceptions=False,
-        )
+        result = runner.invoke(main_cli.main, arguments, catch_exceptions=False)
     return result.exit_code, result.output
 
 
@@ -97,6 +99,19 @@ def test_cache_view():
     nose.tools.eq_(ex_code, 0, out)
 
 
+@slow
+def test_cache_remove():
+    nose.tools.assert_not_equal(len(os.listdir(tmp_prefix)), 0)
+    ex_code, out = call("cache", "info", verbose=True)
+    nose.tools.eq_(ex_code, 0, out)
+    entry = out.split("\n")[0]
+    entry = entry[6:]
+    ex_code, out = call("cache", "remove", "--no-inputs", entry)
+    nose.tools.eq_(ex_code, 0, out)
+    nose.tools.assert_true(out.startswith("About to delete:"))
+    nose.tools.assert_true(out.endswith("Done\n"))
+
+
 @slow
 def test_cache_clear():
     nose.tools.assert_not_equal(len(os.listdir(tmp_prefix)), 0)