Add change 25 instructions
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how_to/Change_25.md
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how_to/Change_25.md
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- cli: pass HEAD by default in argparse
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First, make "@" be an alias for HEAD. (Implemented in `get_oid`)
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Second, do a little refactoring in *cli.py*. Some commands accept an optional
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OID argument and if the argument isn't provided it defaults to HEAD. For example
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`git log` can get an OID to start logging from, but by default it logs all
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commits before HEAD.
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Instead of having each command implement this logic, let's just make "@" (HEAD)
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be the default value for those commands. The relevant commands at this stage
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are `log` and `tag`. More will follow.
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