address rl-algs issue #169 (missing util functions from rcall) (#30)

* copied parts of util.py to baselines.common from rcall

* merged fix for baselines.logger, resolved conflicts

* copied ccap to baselines/baselines/common/util.py

baselines/common/util.py

@@ -0,0 +1,49 @@
+import subprocess
+import shlex
+
+def colorize(string, color='green', bold=False, highlight=False):
+    """
+    Return string surrounded by appropriate terminal color codes to
+    print colorized text.  Valid colors: gray, red, green, yellow,
+    blue, magenta, cyan, white, crimson
+    """
+    attr = []
+    color2num = dict(
+        gray=30,
+        red=31,
+        green=32,
+        yellow=33,
+        blue=34,
+        magenta=35,
+        cyan=36,
+        white=37,
+        crimson=38
+    )
+    num = color2num[color]
+    if highlight:
+        num += 10
+    attr.append(str(num))
+    if bold:
+        attr.append('1')
+    attrs = ';'.join(attr)
+    return '\x1b[%sm%s\x1b[0m' % (attrs, string)
+
+
+def print_cmd(cmd, dry=False):
+    if isinstance(cmd, str):  # for shell=True
+        pass
+    else:
+        cmd = ' '.join(shlex.quote(arg) for arg in cmd)
+    print(colorize(('CMD: ' if not dry else 'DRY: ') + cmd))
+
+
+# this is here because a few other packages outside of rcall depend on it, but it should be removed
+def get_git_commit(cwd=None):
+    return subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD'], cwd=cwd).decode('utf8')
+
+def ccap(cmd, dry=False, env=None, **kwargs):
+    print_cmd(cmd, dry)
+    if not dry:
+        subprocess.check_call(cmd, env=env, **kwargs)
+
+