Add debug logging option

[jnathanh]

It's a little hard to understand how the package is exercising exiftool, this debug option shows exactly what is happening on the wrapped shell and can help troubleshoot the CLI usage.

Sample Output

executing shell command:
     /opt/homebrew/bin/exiftool -stay_open True -@ -
sending to exiftool STDIN:
    -j
    /path/to/file.jpg
    -execute

[barasher]

Hi @jnathanh ! Great idea, thanks for the PR. I'm a bit busy today but I'll have a look at this tomorrow ;)

[barasher]

Sorry, miss-click

[codecov-commenter]

Codecov Report

Merging #53 (c901003) into master (0cce067) will increase coverage by 0.58%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   79.62%   80.21%   +0.58%     
==========================================
  Files           2        2              
  Lines         265      283      +18     
==========================================
+ Hits          211      227      +16     
- Misses         37       38       +1     
- Partials       17       18       +1     

Impacted Files	Coverage Δ
exiftool.go	71.42% <88.88%> (+1.76%)	:arrow_up:

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[barasher]

Don't you think that an "agrgegation key" to regroup log lines for an exiftool instance should be useful ? On a multi-threaded context, it won't be possible to link an exiftool instance and a log line.

• Use exiftool pid as "aggregation key" ?
• Add another parameter to the Debug function ?

What do you think ?

[jnathanh]

Don't you think that an "agrgegation key" to regroup log lines for an exiftool instance should be useful ? On a multi-threaded context, it won't be possible to link an exiftool instance and a log line.

• Use exiftool pid as "aggregation key" ?
• Add another parameter to the Debug function ?

What do you think ?

Well, first I'd say let's not worry about it until it actually becomes a pain point (maybe it's not even necessary).

That said, I can see that it would be necessary if you actually are trying to debug parallel executions. The exiftool PID seems like a sensible default if you want one.

[barasher]

I'm quite busy these last days. I won't be able to have a look until next week. Sorry :(

[barasher]

No response, closing this PR