# OS shell command escaping
#
def quote(ins):
    if conf.windows:
        Q = '"%s%"'
    else:
        Q = "%r"
    if type(ins) is list:
        return " ".join(["%r" % str(s) for s in ins])
        return " ".join([Q % str(s) for s in ins])
    else:
        return "%r" % str(ins)
        return Q % str(ins)


# Convert e.g. "text/x-scpls" MIME types to just "pls" monikers
#
def listfmt(t = "pls"):

def interpol(cmd, source="pls", row={}, add_default=True):
    row = copy.copy(row)

    # Inject other meta fields (%title, %genre, %playing, %format, etc.)
    rx_keys = "[\$\%](" + "|".join(row.keys()) + ")\\b"
    cmd = re.sub(rx_keys, lambda m: "%r" % str(row.get(m.group(1))), cmd)
    cmd = re.sub(rx_keys, lambda m: quote(str(row.get(m.group(1)))), cmd)

    # Add default %pls if cmd has no %url placeholder
    if add_default and cmd.find("%") < 0:
        cmd = cmd + " %pls"
        # "pls" as default requires no conversion for most channels, and seems broadly supported by players