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mdiff: revert grouping optimization for the time being
This had trouble with Ted T'so import test while the original didn't.
manifest hash: e2fc49b5277096bd4c5081558af5efe9964d5310
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diff: use tab to separate date from filename
manifest hash: 73812de990e0e787320c11f7bd83c4ca91a52c4c
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import and startup cleanups
add commands:run()
add copyright notice to commands
eliminate/reorganize imports to speed up start time:
0.5b:
$ time bash -c 'for i in `seq 100`; do ~/bin/hg > /dev/null; done'
real 0m7.718s
user 0m6.719s
sys 0m0.794s
new:
$ time bash -c 'for i in `seq 100`; do hg > /dev/null; done'
real 0m2.171s
user 0m1.684s
sys 0m0.444s
just python:
$ time bash -c 'for i in `seq 100`; do python -c pass; done'
real 0m0.988s
user 0m0.771s
sys 0m0.207s
Ignoring the fixed cost of loading the Python interpreter, we're 5.6
times faster. With the Python load time, we're still 3.5 times faster.
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This is more intelligent/efficient by combining neighboring inserts,
replaces and deletes. Passes test of converting kernel repo, but
doesn't appear to substantially affect compression or performance.
