git

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#!/bin/sh
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do_filename() {
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	desc=$1
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	postimage=$2
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	rm -fr file-creation &&
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	git init file-creation &&
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	(
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		cd file-creation &&
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		git commit --allow-empty -m init &&
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		echo postimage >"$postimage" &&
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		git add -N "$postimage" &&
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		git diff HEAD >"../git-$desc.diff"
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	) &&
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	rm -fr trad-modification &&
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	mkdir trad-modification &&
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	(
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		cd trad-modification &&
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		echo preimage >"$postimage.orig" &&
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		echo postimage >"$postimage" &&
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		! diff -u "$postimage.orig" "$postimage" >"../diff-$desc.diff"
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	) &&
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	rm -fr trad-creation &&
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	mkdir trad-creation &&
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	(
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		cd trad-creation &&
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		mkdir a b &&
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		echo postimage >"b/$postimage" &&
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		! diff -pruN a b >"../add-$desc.diff"
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	)
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}
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do_filename plain postimage.txt &&
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do_filename 'with spaces' 'post image.txt' &&
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do_filename 'with tab' 'post	image.txt' &&
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do_filename 'with backslash' 'post\image.txt' &&
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do_filename 'with quote' '"postimage".txt' &&
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expand add-plain.diff >damaged.diff ||
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{
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	echo >&2 Failed. &&
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	exit 1
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}
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