Tidy up timestamp and timezone code

[z_archive/twitter.git] / twitter / util.py

diff --git a/twitter/util.py b/twitter/util.py
index 3dca53e6807cb0f7e0e512500b134209d2e529c3..8d66c4e8e8e56e58bd4bd468e2708405072e9602 100644 (file)
--- a/twitter/util.py
+++ b/twitter/util.py
@@ -5,14 +5,27 @@ Internal utility functions.
     http://wiki.python.org/moin/EscapingHtml
 """
 
+from __future__ import print_function
 
+import contextlib
 import re
-from html.entities import name2codepoint
+import sys
+import time
+
+try:
+    from html.entities import name2codepoint
+    unichr = chr
+    import urllib.request as urllib2
+    import urllib.parse as urlparse
+except ImportError:
+    from htmlentitydefs import name2codepoint
+    import urllib2
+    import urlparse
 
 def htmlentitydecode(s):
     return re.sub(
         '&(%s);' % '|'.join(name2codepoint),
-        lambda m: chr(name2codepoint[m.group(1)]), s)
+        lambda m: unichr(name2codepoint[m.group(1)]), s)
 
 def smrt_input(globals_, locals_, ps1=">>> ", ps2="... "):
     inputs = []
@@ -25,9 +38,99 @@ def smrt_input(globals_, locals_, ps1=">>> ", ps2="... "):
         try:
             ret = eval('\n'.join(inputs), globals_, locals_)
             if ret:
-                print(ret)
+                print(str(ret))
             return
         except SyntaxError:
             pass
 
+def printNicely(string):
+    if hasattr(sys.stdout, 'buffer'):
+        sys.stdout.buffer.write(string.encode('utf8'))
+        print()
+    else:
+        print(string.encode('utf8'))
+
 __all__ = ["htmlentitydecode", "smrt_input"]
+
+def err(msg=""):
+    print(msg, file=sys.stderr)
+
+class Fail(object):
+    """A class to count fails during a repetitive task.
+
+    Args:
+        maximum: An integer for the maximum of fails to allow.
+        exit: An integer for the exit code when maximum of fail is reached.
+
+    Methods:
+        count: Count a fail, exit when maximum of fails is reached.
+        wait: Same as count but also sleep for a given time in seconds.
+    """
+    def __init__(self, maximum=10, exit=1):
+        self.i = maximum
+        self.exit = exit
+
+    def count(self):
+        self.i -= 1
+        if self.i == 0:
+            err("Too many consecutive fails, exiting.")
+            raise SystemExit(self.exit)
+
+    def wait(self, delay=0):
+        self.count()
+        if delay > 0:
+            time.sleep(delay)
+
+
+def find_links(line):
+    """Find all links in the given line. The function returns a sprintf style
+    format string (with %s placeholders for the links) and a list of urls."""
+    l = line.replace("%", "%%")
+    regex = "(https?://[^ )]+)"
+    return (
+        re.sub(regex, "%s", l),
+        [m.group(1) for m in re.finditer(regex, l)])
+
+def follow_redirects(link, sites= None):
+    """Follow directs for the link as long as the redirects are on the given
+    sites and return the resolved link."""
+    def follow(url):
+        return sites == None or urlparse.urlparse(url).hostname in sites
+
+    class RedirectHandler(urllib2.HTTPRedirectHandler):
+        def __init__(self):
+            self.last_url = None
+        def redirect_request(self, req, fp, code, msg, hdrs, newurl):
+            self.last_url = newurl
+            if not follow(newurl):
+                return None
+            r = urllib2.HTTPRedirectHandler.redirect_request(
+                self, req, fp, code, msg, hdrs, newurl)
+            r.get_method = lambda : 'HEAD'
+            return r
+
+    if not follow(link):
+        return link
+    redirect_handler = RedirectHandler()
+    opener = urllib2.build_opener(redirect_handler)
+    req = urllib2.Request(link)
+    req.get_method = lambda : 'HEAD'
+    try:
+        with contextlib.closing(opener.open(req)) as site:
+            return site.url
+    except (urllib2.HTTPError, urllib2.URLError):
+        return redirect_handler.last_url if redirect_handler.last_url else link
+
+def expand_line(line, sites):
+    """Expand the links in the line for the given sites."""
+    l = line.strip()
+    msg_format, links = find_links(l)
+    args = tuple(follow_redirects(l, sites) for l in links)
+    return msg_format % args
+
+def parse_host_list(list_of_hosts):
+    """Parse the comma separated list of hosts."""
+    p = set(
+        m.group(1) for m in re.finditer("\s*([^,\s]+)\s*,?\s*", list_of_hosts))
+    return p
+