Johannes Schindelin a29ec766a8 rebase -i: rearrange fixup/squash lines using the rebase--helper ...

This operation has quadratic complexity, which is especially painful
on Windows, where shell scripts are *already* slow (mainly due to the
overhead of the POSIX emulation layer).

Let's reimplement this with linear complexity (using a hash map to
match the commits' subject lines) for the common case; Sadly, the
fixup/squash feature's design neglected performance considerations,
allowing arbitrary prefixes (read: `fixup! hell` will match the
commit subject `hello world`), which means that we are stuck with
quadratic performance in the worst case.

The reimplemented logic also happens to fix a bug where commented-out
lines (representing empty patches) were dropped by the previous code.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

2017-03-20 22:45:12 +01:00

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