OPML to Markdown converter based on https://gist.github.com/domdavis/9988867 but customised for Overcast OPML

opml2md.py

# Based on https://gist.github.com/domdavis/9988867
# Changed to handle podcast export OPML from Overcast. e.g. 
# <outline type="rss" text="Road Work" title="Road Work" xmlUrl="http://feeds.5by5.tv/roadwork" htmlUrl="http://5by5.tv/roadwork"/>
# I wanted to grab the xmlUrl and htmlUrl and output a <ul> with links to page and feed.
# also strips usernames and passwords if set in the xmlUrl - add yours to the passwd var
# $ pip install opml
# $ python opml2md.py some_outline.opml
# -> some_outline.md

import codecs
import opml
import sys
 
INPUT = sys.argv[1]
OUTPUT = '.'.join(INPUT.split('.')[:-1] + ['md'])
 
with codecs.open(INPUT, 'r') as f:
    outline = opml.from_string(f.read())

blocks = []
passwd = "username:password@"
adFreeStr = " (Ad-Free)"

# * [The Talk Show With John Gruber](htmlUrl) [RSS](xmlUrl) 

def substring_after(s, delim):
    return s.partition(delim)[2]

def substring_before(s, delim):
    return s.partition(delim)[0]

def strip_end(text, suffix):
    if not text.endswith(suffix):
        return text
    return text[:len(text)-len(suffix)]

def _extractBlocks(indent, node):
    xmlURL = ""
    textStr = ""
    for child in node:
        if indent == 0:
            # strip password if present
            if passwd in child.xmlUrl:
                prefix = substring_before(child.xmlUrl,passwd)
                suffix = substring_after(child.xmlUrl,passwd)
                xmlURL = prefix + suffix
            else:
                xmlURL = child.xmlUrl
            # strip  (Ad-Free) if present - makes lines too long
            if adFreeStr in child.text:
                textStr = strip_end(child.text, adFreeStr)
            else:
                textStr = child.text
            # alternative output without the FontAwesome SVG stuff
            # text = "* [" + child.text + "](" + child.htmlUrl + ") [RSS](" + xmlURL + ")\n";
            text = "* [" + textStr + "](" + child.htmlUrl + ") " + '<a style="color:#fa9b39" href="' + xmlURL +'" itemprop="sameAs"> <i class="fas fa-fw fa-rss-square" aria-hidden="true"></i></a>';
        else:
            depth = 4 * (indent - 1)
            text = (" " * depth) + "* " + child.text

        blocks.append(text)
        if len(child) > 0:
            depth = indent + 1
            _extractBlocks(depth, child)
 
_extractBlocks(0, outline)
 
output_content = '\n'.join(sorted(blocks))
with codecs.open(OUTPUT, 'w', 'utf-8') as f:
    f.write(output_content)
 
print('->', OUTPUT)