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diff: Teach diff to read attribute diff-algorithm
It can be useful to specify diff algorithms per file type. For example, one may want to use the minimal diff algorithm for .json files, another for .c files, etc. Teach the diff machinery to check attributes for a diff algorithm. Enforce precedence by favoring the command line option, then looking at attributes, then finally the config. To enforce precedence order, swap out options parsing for "minimal" and "histogram" into `OPT_CALLBACK_F` so we can set the `xdl_opts_command_line` member. Signed-off-by: John Cai <johncai86@gmail.com>
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