Provide a way to flush git-diff-tree's output
Gitk wants to use git-diff-tree as a filter to tell it which ids from a given list affect a set of files or directories. We don't want to fork and exec a new git-diff-tree process for each batch of ids, since there could be a lot of relatively small batches. For example, a batch could contain as many ids as fit in gitk's headline display window, i.e. 20 or so, and we would be processing a new batch every time the user scrolls that window. The --stdin flag to git-diff-tree is suitable for this, but the main difficulty is that the output of git-diff-tree gets buffered and doesn't get sent until the buffer is full. This provides a way to get git-diff-tree to flush its output buffers. If a blank line is supplied on git-diff-tree's standard input, it will flush its output buffers and then accept further input. Signed-off-by: NPaul Mackerras <paulus@samba.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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