feat(repo): Support copying files to all repos

docs/repo.rst

@@ -33,3 +33,12 @@ Options
 
 -s/--silent - Don't print subcommand output
 --exit - Exit after first failure (non zero exit)
+
+cp
+--
+
+Copies a file into each repository.
+
+.. code-block::
+
+    $ maintain repo cp contributing.md .github/CONTRIBUTING.md

maintain/commands/repo.py

@@ -1,6 +1,7 @@
 import os
 import sys
 import subprocess
+from shutil import copyfile
 
 import click
 from git import Repo
@@ -101,3 +102,23 @@ def check(exit):
                     break
 
     sys.exit(status)
+
+
+@repo.command()
+@click.argument('src', nargs=-1, type=click.Path(exists=True))
+@click.argument('dst', nargs=1, type=click.Path())
+def cp(src, dst):
+    status = 0
+
+    for (repo, path) in gather_repositories():
+        for filename in src:
+            destination = os.path.join(path, dst)
+
+            if os.path.exists(destination):
+                status = 1
+                print('Cannot copy to {}, {} exists'.format(repo, dst))
+                continue
+
+            copyfile(filename, destination)
+
+    sys.exit(status)