diff --git a/gitcheckup.py b/gitcheckup.py
index c05529b..704c405 100644
--- a/gitcheckup.py
+++ b/gitcheckup.py
@@ -1,3 +1,4 @@
+import argparse
 import os
 import subprocess
 import sys
@@ -14,16 +15,7 @@ GIT = winwhich.which('git')
 # A  file4
 # ?? file3
 
-# Here is an example of typical `git log --oneline --branches --not --remotes` output:
-# Only the commits that haven't been pushed to a remote are shown!
-# Thank you cxreg https://stackoverflow.com/a/3338774
-#
-# a755f32 Ready to publish
-# 5602e1e Another commit message
-# a32a372 My commit message
-
-def checkup_committed(directory):
-    os.chdir(directory)
+def checkup_committed():
     command = [GIT, 'status', '--short', '--untracked-files=all']
     output = subprocess.check_output(command, stderr=subprocess.STDOUT)
 
@@ -48,29 +40,64 @@ def checkup_committed(directory):
         details = ''
     else:
         committed = False
-        details = f'(+{added}, -{deleted}, ~{modified})'
+        details = []
+        if added: details.append(f'+{added}')
+        if deleted: details.append(f'-{deleted}')
+        if modified: details.append(f'~{modified}')
+        details = ', '.join(details)
+        details = f'({details})'
 
     return (committed, details)
 
-def checkup_pushed(directory):
-    os.chdir(directory)
-    command = [GIT, 'log', '--oneline', '--branches', '--not', '--remotes']
-    output = subprocess.check_output(command, stderr=subprocess.STDOUT)
+def checkup_pushed():
+    command = [GIT, 'rev-parse', '@']
+    my_head = subprocess.check_output(command, stderr=subprocess.STDOUT)
+    my_head = my_head.strip().decode()
 
-    commits = sum(1 for line in output.splitlines() if line.strip())
+    command = [GIT, 'rev-parse', '@{u}']
+    remote_head = subprocess.check_output(command, stderr=subprocess.STDOUT)
+    remote_head = remote_head.strip().decode()
 
-    if commits == 0:
+    command = [GIT, 'merge-base', '@', '@{u}']
+    merge_base = subprocess.check_output(command, stderr=subprocess.STDOUT)
+    merge_base = merge_base.strip().decode()
+
+    if my_head == remote_head:
+        to_push = 0
+        to_pull = 0
+    else:
+        to_push = len(git_commits_between(merge_base, my_head))
+        to_pull = len(git_commits_between(merge_base, remote_head))
+
+    if (to_push, to_pull) == (0, 0):
         pushed = True
         details = ''
     else:
         pushed = False
-        details = f'(↑{commits})'
+        details = []
+        if to_push: details.append(f'↑{to_push}')
+        if to_pull: details.append(f'↓{to_pull}')
+        details = ', '.join(details)
+        details = f'({details})'
 
     return (pushed, details)
 
-def checkup(directory):
-    (committed, commit_details) = checkup_committed(directory)
-    (pushed, push_details) = checkup_pushed(directory)
+def git_commits_between(a, b):
+    command = [GIT, 'log', '--oneline', f'{a}..{b}']
+    output = subprocess.check_output(command, stderr=subprocess.STDOUT)
+    lines = output.strip().decode().splitlines()
+    return lines
+
+def git_fetch():
+    command = [GIT, 'fetch', '--all']
+    output = subprocess.check_output(command, stderr=subprocess.STDOUT)
+
+def checkup(directory, do_fetch=False):
+    os.chdir(directory)
+    if do_fetch:
+        git_fetch()
+    (committed, commit_details) = checkup_committed()
+    (pushed, push_details) = checkup_pushed()
     return {
         'committed': committed,
         'commit_details': commit_details,
@@ -78,7 +105,7 @@ def checkup(directory):
         'push_details': push_details,
     }
 
-def main(argv):
+def gitcheckup(do_fetch=False):
     directories_file = os.path.join(os.path.dirname(__file__), 'gitcheckup.txt')
     try:
         handle = open(directories_file, 'r')
@@ -93,7 +120,7 @@ def main(argv):
     directories = [line for line in directories if line]
 
     for directory in directories:
-        result = checkup(directory)
+        result = checkup(directory, do_fetch=do_fetch)
         committed = 'C' if result['committed'] else ' '
         pushed = 'P' if result['pushed'] else ' '
 
@@ -106,5 +133,17 @@ def main(argv):
         details = (' ' + details).rstrip()
         print(f'[{committed}][{pushed}] {directory}{details}')
 
+def gitcheckup_argparse(args):
+    return gitcheckup(do_fetch=args.do_fetch)
+
+def main(argv):
+    parser = argparse.ArgumentParser(description=__doc__)
+
+    parser.add_argument('--fetch', dest='do_fetch', action='store_true')
+    parser.set_defaults(func=gitcheckup_argparse)
+
+    args = parser.parse_args(argv)
+    return args.func(args)
+
 if __name__ == '__main__':
     raise SystemExit(main(sys.argv[1:]))