newsbeuter - add filter script

local/bin/titlefilter.py

@@ -0,0 +1,78 @@
+#!/bin/env python
+# Filter items not containing keywords (given as parameters) from a rss feed.
+# Reads stdin, writes stdout.
+
+import sys
+
+# The hard way, pretty clean but doesn't work (probably) because HTMLParser puts
+# all the tags in lowercase.
+
+#from html.parser import HTMLParser
+#from itertools import chain
+
+#def start_to_tag(tag, attrs, end=False):
+#    if end:
+#        items = chain([tag], ('{}="{}"'.format(n,v) for (n,v) in attrs), ['/'])
+#    else:
+#        items = chain([tag], ('{}="{}"'.format(n,v) for (n,v) in attrs))
+#    return "<{}>".format(" ".join(items))
+#
+#class FeedParser(HTMLParser):
+#
+#    def __init__(self, keep):
+#        super().__init__(self)
+#        self.keep = keep
+#        self.parts = []
+#        self.item = None
+#
+#    def handle_starttag(self, tag, attrs, end=False):
+#        string = start_to_tag(tag, attrs, end=end)
+#        if tag == "item":
+#            self.item = string
+#        elif self.item is None:
+#            self.parts.append(string)
+#        else:
+#            self.item += string
+#
+#    def handle_endtag(self, tag):
+#        string = "</{}>".format(tag)
+#        if self.item is None:
+#            self.parts.append(string)
+#        elif tag == "item":
+#            if any(title in self.item for title in self.keep):
+#                string = self.item + string
+#            else:
+#                string = ""
+#            self.item = None
+#            self.parts.append(string)
+#        else:
+#            self.item += string
+#
+#    def handle_startendtag(self, tag, attrs):
+#        self.handle_starttag(tag, attrs, end=True)
+#
+#    def handle_data(self, data):
+#        if self.item is None:
+#            self.parts.append(data)
+#        else:
+#            self.item += data
+#
+#    def handle_entityref(self, data):
+#        self.handle_data("&{};".format(data))
+#
+#    def handle_charref(self, data):
+#        self.handle_data("$#{};".format(data))
+
+#parser = FeedParser(sys.argv)
+#parser.feed(sys.stdin.read())
+#parser.close()
+
+#print(''.join(parser.parts), end='')
+
+# The easy way. Works.
+def check(block):
+    if '</item>' not in block: return True
+    if any(title in block for title in sys.argv): return True
+    return False
+
+print('<item>'.join(filter(check, sys.stdin.read().split('<item>'))), end='')