Bug: LOC from multiple repos not averaged

[juliusHuelsmann]

When I add multiple repos as command line arguments to git-fame, their lines of code are not averaged because check_output reports fatal: no such path [repo-name/path] in HEAD in ~ line 287, _gitfame.py.
Root of the bug: prefix_gitdir is set if multiple repos are given, which joins the git directory to the fname.

Example:

Setup

git clone git@github.com:casperdcl/git-fame.git
cd git-fame
python -m gitfame ../git-fame ../git-fame

Output

Total commits: 492
Total ctimes: 0
Total files: 0
Total loc: 0
| Author                   |   loc |   coms |   fils |  distribution   |
|:-------------------------|------:|-------:|-------:|:----------------|
| Casper da Costa-Luis     |     0 |    470 |      0 | 0.0/95.5/ 0.0   |
| Cory Carson (Salesforce) |     0 |     10 |      0 | 0.0/ 2.0/ 0.0   |
...

Desired output

Total ctimes: 1798
Total files: 31
Total loc: 4550
| Author                   |   loc |   coms |   fils |  distribution   |
|:-------------------------|------:|-------:|-------:|:----------------|
| Casper da Costa-Luis     |  4536 |    470 |     28 | 99.7/95.5/90.3  |
| Cory Carson (Salesforce) |    10 |     10 |      1 | 0.2/ 2.0/ 3.2   |
...

Environment

OS: Arch Linux
python version : Python 3.9.2

Patch which works for me

As I am unfamiliar with the code base and do not know why prefix_gitdir is set, I did not open a PR for this. My version can be found here I am unsure if my solution is really a fix or if it causes other problems for different command line options. However, I attached the patch which fixes the issue for me below:

diff --git a/gitfame/_gitfame.py b/gitfame/_gitfame.py
index 59916e9..01ce6f7 100755
--- a/gitfame/_gitfame.py
+++ b/gitfame/_gitfame.py
@@ -279,14 +279,16 @@ def _get_auth_stats(
     for fname in tqdm(file_list, desc=gitdir if prefix_gitdir else "Processing",
                       disable=silent_progress, unit="file"):
 
-      if prefix_gitdir:
-        fname = path.join(gitdir, fname)
       try:
         blame_out = check_output(
             base_cmd + [branch, fname], stderr=subprocess.STDOUT)
       except Exception as err:
         getattr(log, "warn" if warn_binary else "debug")(fname + ':' + str(err))
         continue
+
+      if prefix_gitdir:
+          fname = path.join(gitdir, fname)
+
       log.log(logging.NOTSET, blame_out)
 
       # Strip boundary messages,

[casperdcl]

fixed in #58 I think.