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This is a rough draft for a "pathbase" feature. It operates like git's interactive rebase but is not interactive. I'm not intending for this to be merged; just looking for comments on whether this could be merged. It would need test cases at least.

After running git-filter-repo --analyze --one-path-per-blob, one annotates the resulting .git/filter-repo/analysis/blob-shas-and-paths.txt with commands and feeds that back in via git-filter-repo --pathbase. This avoids most of the human error inherent in a person transforming a blob-shas-and-paths.txt into a file that --paths-from-file can handle.

It is a process that most git users will already be familiar with from rebase.

Unless the extra line in the blob-shas-and-paths.txt file causes issues, this is 100% backwards compatible.

I am currently using this to clean a repo that had a lot of build artifacts checked in. I find it better than (re-)creating a pathnames-only file from blob-shas-and-paths.txt because I can see what I'm selecting and it's less transformation than making the pathnames-only file.
Part of my equation is this lets me do the annotation slowly over time/many iterations while I figure out what needs to come out and what stays.

Yes, this is a different approach than the "blobbase" PR I posted. It turns out that in a lot of cases, I want to remove an item from an erroneously checked in build products directory, but that item is an art/etc asset that should still reside in the codebase. Thus selecting the sha for stripping removes both, and I only want one.

Also, the 0-byte deduplication blob sha has a lot of unrelated files pointing to it; those also have to be filtered by path.

This causes the blob_shas_and_paths.txt to be created with one pathname
per line, instead of grouping all the paths for a specific blob on a
single line.

This supports the pathbase feature in the next commit.

This means that occasionally a blob's sha will be repeated in the file.
This is expected and normal.

Signed-off-by: Stuart MacDonald <[email protected]>
Reads in an annotated blob_shas_and_paths.txt, working like "git
rebase", to match paths as if they had been passed in with the "--path"
argument.

Signed-off-by: Stuart MacDonald <[email protected]>
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