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由 Shawn O. Pearce 提交于
Users may want to know what a file is before they add it to the repository, especially if its a binary file. So when possible invoke 'file' on the path and try to get its output. Since this is strictly advice to the user we won't bother to report any failures from our attempt to run `file`. Since some file commands also output the path name they were given we look for that case and strip it off the front of the returned output before placing it into the diff viewer. Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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