Junio, how does this look?

Signed-off-by: Brian Henderson <henderson...@gmail.com>
---
 contrib/diff-highlight/Makefile                  |   5 +
 contrib/diff-highlight/t/Makefile                |  22 ++++
 contrib/diff-highlight/t/t9400-diff-highlight.sh | 122 +++++++++++++++++++++++
 3 files changed, 149 insertions(+)
 create mode 100644 contrib/diff-highlight/Makefile
 create mode 100644 contrib/diff-highlight/t/Makefile
 create mode 100755 contrib/diff-highlight/t/t9400-diff-highlight.sh

diff --git a/contrib/diff-highlight/Makefile b/contrib/diff-highlight/Makefile
new file mode 100644
index 0000000..9018724
--- /dev/null
+++ b/contrib/diff-highlight/Makefile
@@ -0,0 +1,5 @@
+# nothing to build
+all:
+
+test:
+       $(MAKE) -C t
diff --git a/contrib/diff-highlight/t/Makefile 
b/contrib/diff-highlight/t/Makefile
new file mode 100644
index 0000000..5ff5275
--- /dev/null
+++ b/contrib/diff-highlight/t/Makefile
@@ -0,0 +1,22 @@
+-include ../../../config.mak.autogen
+-include ../../../config.mak
+
+# copied from ../../t/Makefile
+SHELL_PATH ?= $(SHELL)
+SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
+T = $(wildcard t[0-9][0-9][0-9][0-9]-*.sh)
+
+all: test
+test: $(T)
+
+.PHONY: help clean all test $(T)
+
+help:
+       @echo 'Run "$(MAKE) test" to launch test scripts'
+       @echo 'Run "$(MAKE) clean" to remove trash folders'
+
+$(T):
+       @echo "*** $@ ***"; '$(SHELL_PATH_SQ)' $@ $(GIT_TEST_OPTS)
+
+clean:
+       $(RM) -r 'trash directory'.*
diff --git a/contrib/diff-highlight/t/t9400-diff-highlight.sh 
b/contrib/diff-highlight/t/t9400-diff-highlight.sh
new file mode 100755
index 0000000..3c04116
--- /dev/null
+++ b/contrib/diff-highlight/t/t9400-diff-highlight.sh
@@ -0,0 +1,122 @@
+#!/bin/sh
+
+test_description='Test diff-highlight'
+
+CURR_DIR=$(pwd)
+TEST_OUTPUT_DIRECTORY=$(pwd)
+TEST_DIRECTORY="$CURR_DIR"/../../../t
+DIFF_HIGHLIGHT="$CURR_DIR"/../diff-highlight
+
+CW="\033[7m"   # white
+CR="\033[27m" # reset
+
+. "$TEST_DIRECTORY"/test-lib.sh
+
+if ! test_have_prereq PERL
+then
+       skip_all='skipping diff-highlight tests; perl not available'
+       test_done
+fi
+
+# dh_test is a test helper function which takes 1) some file data, 2) some
+# change of the file data, creates a diff and commit of the changes and passes
+# that through diff-highlight.
+# The optional 3rd parameter is the expected output of diff-highlight minus the
+# diff/commit header. This parameter is given directly to printf as the format
+# string (in order to properly handle ascii escape codes; CW, CR), so any '%'
+# need to be doubled to protect it.
+# Don't include a 3rd parameter if diff-highlight is supposed to leave the
+# input unmodified.
+# For convienence, the 3rd parameter can begin with a newline which will be
+# stripped.
+dh_test () {
+       a="$1" b="$2" &&
+
+       {
+               printf "$a" >file &&
+               git add file &&
+               git commit -m "Add a file" &&
+
+               printf "$b" >file &&
+               git diff file >diff.raw &&
+               git commit -am "Update a file" &&
+               git show >commit.raw
+       } >/dev/null &&
+
+       if test $# -ge 3
+       then
+               # strip optional beginning newline
+               printf "$3" | perl -pe 's/^\n//'
+       else
+               test_strip_patch_header diff.raw
+       fi >patch.exp &&
+
+       "$DIFF_HIGHLIGHT" <diff.raw | test_strip_patch_header >diff.act &&
+       "$DIFF_HIGHLIGHT" <commit.raw | test_strip_patch_header >commit.act &&
+       test_cmp patch.exp diff.act &&
+       test_cmp patch.exp commit.act
+}
+
+test_strip_patch_header () {
+       sed -e '1,/^@@/d' "$@"
+}
+
+test_expect_success 'diff-highlight highlights the beginning of a line' '
+       dh_test \
+               "aaa\nbbb\nccc\n" \
+               "aaa\n0bb\nccc\n" \
+"
+ aaa
+-${CW}b${CR}bb
++${CW}0${CR}bb
+ ccc
+"
+'
+
+test_expect_success 'diff-highlight highlights the end of a line' '
+       dh_test \
+               "aaa\nbbb\nccc\n" \
+               "aaa\nbb0\nccc\n" \
+"
+ aaa
+-bb${CW}b${CR}
++bb${CW}0${CR}
+ ccc
+"
+'
+
+test_expect_success 'diff-highlight highlights the middle of a line' '
+       dh_test \
+               "aaa\nbbb\nccc\n" \
+               "aaa\nb0b\nccc\n" \
+"
+ aaa
+-b${CW}b${CR}b
++b${CW}0${CR}b
+ ccc
+"
+'
+
+test_expect_success 'diff-highlight does not highlight whole line' '
+       dh_test \
+               "aaa\nbbb\nccc\n" \
+               "aaa\n000\nccc\n"
+'
+
+test_expect_failure 'diff-highlight highlights mismatched hunk size' '
+       dh_test \
+               "aaa\nbbb\n" \
+               "aaa\nb0b\nccc\n" \
+"
+ aaa
+-b${CW}b${CR}b
++b${CW}0${CR}b
++ccc
+"
+'
+
+# TODO add multi-byte test
+
+test_done
+
+# vim: set noet
-- 
2.9.0

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